Page 1 This manual should be kept near the machine for reference and periodically reviewed by all personnel who will come into contact with it. NOTICE Komatsu has Operation & Maintenance Manuals written in some other languages. If a foreign language manual is necessary, contact your local distributor for availability.
Page 2 1 - 1...
Page 3 Keep this manual in the storage location for the operation and maintenance manual given below, and have all personnel read it periodically. If this manual has been lost or has become dirty and cannot be read, request a replacement manual immediately from Komatsu or your Komatsu distributor.
Page 4 FOREWORD SAFETY INFORMATION SAFETY INFORMATION To enable you to use this machine safely, safety precautions and labels are given in this manual and affixed to the machine to give explanations of situations involving potential hazards and of the methods of avoiding such situations.
Page 5 Continuing improvements in the design of this machine can lead to changes in detail which may not be reflected in this manual. Consult Komatsu or your Komatsu distributor for the latest available information of your machine or for questions regarding information in this manual.
Page 6 BREAKING-IN THE NEW MACHINE NOTICE Your Komatsu machine has been thoroughly adjusted and tested before shipment from the factory. However, operating the machine under full load before breaking the machine in can adversely affect the performance and shorten the machine life.
Page 7 FOREWORD PRODUCT INFORMATION PRODUCT INFORMATION When requesting service or ordering replacement parts, please inform your Komatsu distributor of the following items. MACHINE SERIAL NUMBER PLATE AND ITS LOCATION On the front bottom right of the operator's cab (side of upper frame) ENGINE SERIAL NUMBER PLATE AND ITS LOCATION This is at the side of the oil cooler housing on the left side face of the engine cylinder block.
Page 8 FOREWORD PRODUCT INFORMATION SERVICE METER LOCATION On top of the machine monitor YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR Machine serial No. Engine serial No. Distributor name Address Service Personnel Phone/Fax 1 - 7...
Page 9: Table Of Contents
FOREWORD CONTENTS CONTENTS FOREWORD FOREWORD SAFETY INFORMATION INTRODUCTION DIRECTIONS OF MACHINE BREAKING-IN THE NEW MACHINE PRODUCT INFORMATION MACHINE SERIAL NUMBER PLATE AND ITS LOCATION ENGINE SERIAL NUMBER PLATE AND ITS LOCATION SERVICE METER LOCATION YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR SAFETY SAFETY SAFETY LABELS...
Page 10: Foreword
FOREWORD CONTENTS ACCUMULATOR 3- 74 MACHINE OPERATIONS AND CONTROLS 3- 75 BEFORE STARTING ENGINE 3- 75 STARTING ENGINE 3- 94 AFTER STARTING ENGINE 3- 99 STOPPING THE ENGINE 3-107 MACHINE OPERATION 3-108 STEERING THE MACHINE 3-112 SWINGING 3-114 WORK EQUIPMENT CONTROLS AND OPERATIONS 3-115 WORKING MODE 3-117...
Page 11 FOREWORD CONTENTS PROPER SELECTION TIGHTENING TORQUE SPECIFICATIONS 4- 13 TIGHTENING TORQUE LIST 4- 13 SAFETY CRITICAL PARTS 4- 14 SAFETY CRITICAL PARTS LIST 4- 15 MAINTENANCE SCHEDULE 4- 16 MAINTENANCE SCHEDULE CHART 4- 16 MAINTENANCE PROCEDURE 4- 18 INITIAL 100 HOURS MAINTENANCE (ONLY AFTER THE FIRST 100 HOURS) 4- 18 INITIAL 500 HOURS MAINTENANCE (ONLY AFTER THE FIRST 500 HOURS) 4- 18...
Page 12 FOREWORD CONTENTS COMBINATION OF WORK EQUIPMENT 7- 22 COMBINATION OF WORK EQUIPMENT 7- 22 INDEX 1 - 11...
Page 14 2 - 1...
Page 15: Safety Information
SAFETY SAFETY SAFETY SAFETY LABELS Location of safety labels Safety labels SAFETY INFORMATION 2- 12 Safety Rules 2- 12 If Abnormalities are Found 2- 12 Working Wear and Personal Protective Items 2- 12 Fire Extinguisher and First Aid Kit 2- 12 Safety Equipment 2- 12 Keep Machine Clean...
Page 16 SAFETY SAFETY SAFETY MACHINE OPERATION 2- 20 Starting Engine 2- 20 Checks Before Starting Engine 2- 20 Safety Rules for Starting Engine 2- 20 Starting Engine in Cold Weather 2- 21 Operation 2- 22 Checks Before Operation 2- 22 Safety Rules for Changing Machine Directions 2- 22 Safety Rules for Traveling 2- 23...
Page 17: Safety Labels
If the labels are damaged, lost, or cannot be read properly, replace them with new ones. For details of the part numbers for the labels, see this manual or the actual label, and place an order with Komatsu distributor. 2 - 4...
Page 18: Location Of Safety Labels
SAFETY SAFETY LABELS LOCATION OF SAFETY LABELS 2 - 5...
Page 19: Safety Labels
SAFETY SAFETY LABELS SAFETY LABELS (1) Caution before operating or maintaining machine (09651-03001) (2) Caution before operating (09802-03000) (3) Caution for leaving operator's seat (09654-03001) 2 - 6...
Page 20 SAFETY SAFETY SAFETY LABELS SAFETY LABELS (4) Caution for going close to electric cables (09801-03001) (5) Caution when opening or closing front window (09839-03000) (6) Warning when stowing front window (09803-03000) 2 - 7...
Page 21 SAFETY SAFETY SAFETY LABELS SAFETY LABELS (7) Warning for hot oil (09653-03001) (8) Warning for hot cooling water (09668-03001) (9) Caution for handling accumulator (09659-53000) (10) Warning when adjusting track tension (09657-03003) 2 - 8...
Page 22 SAFETY SAFETY SAFETY LABELS SAFETY LABELS (11) Warning for improper use of cables (09808-03000) (12) Stop engine when performing inspection or maintenance (09667-03001) (13) Explanation of method for emergency escape (20Y-00-22880) (14) Warning against falling off the edge (09805-23000) (15) Warning against falling (09805-13000) 2 - 9...
Page 23 SAFETY SAFETY SAFETY LABELS SAFETY LABELS (16) Keep off swing area (09133-23000) (17) Warning when handling battery (09664-30082) (18) Precautions for high voltage (6217-81-9260) 2 - 10...
Page 24 SAFETY SAFETY LABELS (19) Precautions for high voltage (7872-10-1600) (20) Jump start prohibited (09842-A0481) 2 - 11...
Page 25: General Precautions
SAFETY GENERAL PRECAUTIONS GENERAL PRECAUTIONS SAFETY RULES Only trained and authorized personnel can operate and maintain the machine. Follow all safety rules, precautions and instructions in this manual when operating or performing maintenance on the machine. If you are not feeling well, or if you are under the influence of alcohol or medication, your ability to safely operate or repair your machine may be severely impaired, putting yourself and everyone else on your job site in danger.
Page 26: Keep Machine Clean
SAFETY GENERAL PRECAUTIONS KEEP MACHINE CLEAN If water gets into the electrical system, there is a hazard that it will cause malfunctions or misoperation. Do not use water or steam to wash the electrical system (sensors, connectors). If inspection and maintenance is carried out when the machine is still dirty with mud or oil, there is a hazard that you will slip and fall, or that dirt or mud will get into your eyes.
Page 27: Handrails And Steps
SAFETY GENERAL PRECAUTIONS HANDRAILS AND STEPS To prevent personal injury caused by slipping or falling off the machine, always do as follows. Use the handrails and steps marked by arrows in the diagram on the right when getting on or off the machine. To ensure safety, always face the machine and maintain three-point contact (both feet and one hand, or both hands and one foot) with the handrails and steps (including the track shoe)
Page 28: Burn Prevention
SAFETY GENERAL PRECAUTIONS BURN PREVENTION Hot coolant To prevent burns from hot water or steam spurting out when checking or draining the coolant, wait for the water to cool to a temperature where it is possible to touch the radiator cap by hand before starting the operation.
Page 29: Action If Fire Occurs
The above recommendations assume that the conditions are for standard operations, but it may be necessary to add additional guards according to the operating conditions on the jobsite. Always contact your Komatsu distributor for advice. 2 - 16...
Page 30: Attachment Installation
Any modification made without authorization from Komatsu can create hazards. Before making a modification, consult your Komatsu distributor. Komatsu will not be responsible for any injuries, accidents, product failures or other property damages resulting from modifications made without authorization from Komatsu.
Page 31: Working On Loose Ground
SAFETY GENERAL PRECAUTIONS WORKING ON LOOSE GROUND Avoid traveling or operating your machine too close to the edge of cliffs, overhangs, and deep ditches. The ground may be weak in such areas. If the ground should collapse under the weight or vibration of the machine, there is a hazard that the machine may fall or tip over.
Page 32: Ventilation For Enclosed Area
Do not allow other persons to approach during the operation. Always observe the rules and regulations for the work site and environmental standards. This machine does not use asbestos, but there is a danger that imitation parts may contain asbestos, so always use genuine Komatsu parts. 2 - 19...
Page 33: Safety Machine Operation
SAFETY SAFETY MACHINE OPERATION SAFETY MACHINE OPERATION STARTING ENGINE If there is a warning tag hanging from the work equipment control lever, do not start the engine or touch the levers. CHECKS BEFORE STARTING ENGINE Carry out the following checks before starting the engine at the beginning of the day's work. Completely remove all flammable materials accumulated around the engine and battery, and remove any dirt from the windows, mirrors, handrails and steps.
Page 34: Starting Engine In Cold Weather
SAFETY SAFETY MACHINE OPERATION STARTING ENGINE IN COLD WEATHER Carry out the warming-up operation thoroughly. If the machine is not thoroughly warmed up before the control levers are operated, the reaction of the machine will be slow, and this may lead to unexpected accidents. If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source.
Page 35: Operation
SAFETY SAFETY MACHINE OPERATION OPERATION CHECKS BEFORE OPERATION When carrying out the checks, move the machine to a wide area where there are no obstructions, and operate slowly. Do not allow anyone near the machine. Check that the movement of the machine matches the display on the control pattern card. If it does not match, replace it immediately with the correct control pattern card.
Page 36: Safety Rules For Traveling
SAFETY SAFETY MACHINE OPERATION SAFETY RULES FOR TRAVELING When traveling on flat ground, keep the work equipment 40 to 50 cm (16 to 20 in) high above the ground. When traveling on rough ground, travel at low speed and do not operate the steering suddenly.
Page 37: Operations On Slopes
SAFETY SAFETY SAFETY MACHINE OPERATION SAFETY MACHINE OPERATION When traveling up a steep slope, extend the work equipment to the front to improve the balance, keep the work equipment approximately 20 to 30 cm (8 to 12 in) above the ground, and travel at low speed.
Page 38 SAFETY SAFETY SAFETY MACHINE OPERATION SAFETY MACHINE OPERATION Do not excavate too deeply under the front of the machine. The ground under the machine may collapse and cause the machine to fall. To make it easier to escape if there is any problem, set the tracks at right angles to the road shoulder or cliff with the sprocket at the rear when carrying out operations.
Page 39: Operations On Snow
SAFETY SAFETY MACHINE OPERATION When using a breaker or other heavy work equipment, there is a hazard of the machine losing its balance and tipping over. When operating on flat ground as well as on slopes. Do not suddenly lower, swing, or stop the work equipment. Do not suddenly extend or retract the boom cylinder.
Page 40: Parking Machine
SAFETY SAFETY MACHINE OPERATION PARKING MACHINE Park the machine on firm, level ground. Select a place where there is no hazard of landslides, falling rocks, or flooding. Lower the work equipment completely to the ground. When leaving the machine, set lock lever (1) to the LOCK position (L), then stop the engine.
Page 41: Transportation
SAFETY MACHINE OPERATION TRANSPORTATION The machine can be divided into parts for transportation, so when transportating the machine, please contact your Komatsu distributor to have the work carried out. LOADING AND UNLOADING When loading or unloading the machine, mistaken operation may bring the hazard of the machine tipping over or falling, so particular care is necessary.
Page 42: Battery
SAFETY SAFETY MACHINE OPERATION BATTERY BATTERY HAZARD PREVENTION Battery electrolyte contains sulphuric acid, and batteries generate flammable hydrogen gas, which may explode. Mistaken handling can lead to serious injury or fire. For this reason, always observe the following precautions. Do not use or charge the battery if the battery electrolyte level is below the LOWER LEVEL line. This may cause an explosion.
Page 43: Starting Engine With Booster Cables
SAFETY SAFETY MACHINE OPERATION STARTING ENGINE WITH BOOSTER CABLES If any mistake is made in the method of connecting the booster cables, it may cause the battery to explode, so always do as follows. When starting with a booster cable, carry out the starting operation with two workers (one worker sitting in the operator's seat and the other working with the battery).
Page 44: Towing
SAFETY SAFETY MACHINE OPERATION TOWING SAFETY RULES FOR TOWING Serious injury or death could result if a disabled machine is towed incorrectly or if there is a mistake in the selection or inspection of the wire rope. For towing, see "TOWING THE MACHINE (PAGE 3-152)". Always check that the wire rope used for towing has ample strength for the weight of the machine being towed.
Page 45: Lifting Objects With Bucket
SAFETY SAFETY MACHINE OPERATION LIFTING OBJECTS WITH BUCKET SAFETY RULES FOR LIFTING OBJECTS Do not carry out lifting work on slopes, soft ground, or other places where the machine is not stable. Use wire rope that conforms to the specified standard. Always observe the specified lifting load strictly.
Page 46: Safety Maintenance Information
SAFETY SAFETY MAINTENANCE INFORMATION SAFETY MAINTENANCE INFORMATION WARNING TAG Always attach the "DO NOT OPERATE" warning tag to the work equipment control lever in the operator's cab to alert others that you are performing service or maintenance on the machine. Attach additional warning tags around the machine if necessary.
Page 47: Stop Engine Before Carrying Out Maintenance
SAFETY SAFETY MAINTENANCE INFORMATION STOP ENGINE BEFORE CARRYING OUT MAINTENANCE Stop the machine on firm, level ground. Select a place where there is no hazard of landslides, falling rocks, or flooding. Lower the work equipment completely to the ground and stop the engine.
Page 48: Two Workers For Maintenance When Engine Is Running
Do not make holes in it, weld it, or use a cutting torch. Do not hit or roll the accumulator, or subject it to any impact. When disposing of the accumulator, the gas must be released. Please contact your Komatsu distributor to have this work performed. 2 - 35...
Page 49: Personnel
SAFETY SAFETY MAINTENANCE INFORMATION PERSONNEL Do not allow any unauthorized personnel into the area when servicing the machine. If necessary, employ a guard. ATTACHMENTS Appoint a leader before starting removal or installation operations for attachments. Place attachments that have been removed from the machine in a stable condition so that they do not fall.
Page 50: Welding Works
If it is disassembled by mistake, the spring will fly out and cause serious injury. When it becomes necessary to disassemble it, ask your Komatsu distributor to do the work. SAFETY RULES FOR HIGH-PRESSURE OIL The hydraulic system is always under internal pressure.
Page 51: Precaution For High Fuel Pressure
If any loose bolts are found, stop work and tighten to the specified torque. If any damaged hoses are found, stop operations immediately and contact your Komatsu distributor. Replace the hose if any of the following problems are found.
Page 52: Waste Materials
SAFETY SAFETY MAINTENANCE INFORMATION WASTE MATERIALS To prevent pollution, pay careful attention to the method of disposing of waste materials. Always put oil drained from your machine in containers. Never drain oil directly onto the ground or dump into the sewage system, rivers, the sea, or lakes.
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Page 55: Machine View Illustrations
OPERATION MACHINE VIEW ILLUSTRATIONS MACHINE VIEW ILLUSTRATIONS OVERALL MACHINE VIEW Bucket Sprocket Bucket link Track frame Bucket cylinder (10) Track shoe (11) Idler Arm cylinder (12) OPG (Operator Protection Guard) Boom This is an option for the PC750-7. Boom cylinder 3 - 2...
Page 56: Controls And Gauges
OPERATION MACHINE VIEW ILLUSTRATIONS CONTROLS AND GAUGES 3 - 3...
Page 57 OPERATION OPERATION MACHINE VIEW ILLUSTRATIONS MACHINE VIEW ILLUSTRATIONS Car radio (24) Working mode selection switch Lower wiper switch (25) Wiper monitor (Fixed front window cab specification) (26) Engine pre-heating monitor (27) Swing lock monitor Large capacity airflow air conditioner (28) Engine water temperature monitor blower switch (if equipped) (29)
Page 58: Detailed Controls And Gauges
OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES The following is an explanation of devices needed for operating the machine. To perform suitable operations correctly and safely, it is important to completely understand methods of operating the equipment, and the meanings of the displays. MONITORING SYSTEM (1) All lights up screen (3) Normal operation screen...
Page 59 OPERATION DETAILED CONTROLS AND GAUGES Basic Operation of Machine Monitor If There Is Abnormality When Starting Engine If there is any abnormality when starting the engine, the check before starting screen (A) changes to the maintenance interval warning screen (B), warning screen (D), or error screen (E). After displaying the check before starting screen (A) for 2 seconds, the screen changes to the maintenance interval warning screen (B).
Page 60 OPERATION DETAILED CONTROLS AND GAUGES If Any Abnormality Occurs During Operation If any abnormality occurs during operation, the normal operation screen (A) changes to warning screen (B) or the error screen (D). After displaying warning screen (B) for 2 seconds, the screen automatically changes to warning screen (C). 3 - 7...
Page 61 OPERATION DETAILED CONTROLS AND GAUGES Basic Check Monitors CAUTION These monitors do not guarantee the condition of the machine. Do not simply rely on the monitor when carrying out checks before starting (daily inspection). Always get off the machine and check each item directly.
Page 62 For details of the method of checking the maintenance interval, see "Maintenance Switch (PAGE 3-23)" in the Detailed controls and gauges. If it is desired to change settings for the maintenance interval, have your Komatsu distributor change the settings. 3 - 9...
Page 63 OPERATION DETAILED CONTROLS AND GAUGES Caution Monitors CAUTION If the warning monitor lights up red, stop operations as soon as possible and perform inspection and maintenance of the applicable location. If the warning is ignored, it may lead to failure. These are items that should be observed while the engine is running.
Page 64 OPERATION DETAILED CONTROLS AND GAUGES Fuel Level Monitor Monitor (2) lights up to warn the operator the fuel level in the tank is low. If the remaining amount of fuel goes down to 101 liters (26.68 US gal), the light changes from green to red, so add fuel as soon as possible.
Page 65 OPERATION DETAILED CONTROLS AND GAUGES Emergency Monitors CAUTION If the monitor lights up red, stop the engine immediately or run at low idle, check applicable location, then perform necessary actions. These items should be observed while the engine is running. If there is a problem, the monitor for the abnormal location lights up red and buzzer sounds, perform action immediately.
Page 66 OPERATION DETAILED CONTROLS AND GAUGES Hydraulic Oil Temperature Monitor Monitor (2) warns operator that the hydraulic oil temperature has risen. If monitor lights up red during operations, run engine at low idle or stop the engine and wait until the oil temperature goes down and monitor (2) changes to green.
Page 67 OPERATION DETAILED CONTROLS AND GAUGES Meter Display Portion D(1) Engine pre-heating monitor D(6) Travel speed monitor D(2) Swing lock monitor D(7) Engine water temperature gauge D(3) Wiper monitor D(8) Fuel gauge D(4) Auto-deceleration monitor D(9) Hydraulic oil temperature gauge D(5) Working mode monitor D(10) Service meter...
Page 68 OPERATION DETAILED CONTROLS AND GAUGES Swing Lock Monitor This monitor (2) informs the operator that the swing lock has been actuated. When actuated: Lights up The monitor lights up when the swing lock switch is turned to the ON (LOCK) position. The monitor flashes when the swing holding brake release switch is turned ON.
Page 69 OPERATION DETAILED CONTROLS AND GAUGES Travel Speed Monitor Monitor (6) displays set mode for the travel speed. The monitor display when the travel speed selector switch is operated, as follows. Lo : Low speed Hi : High speed Gauges and Meter Engine Coolant Temperature Gauge Meter (7) indicates the engine cooling water temperature.
Page 70 OPERATION DETAILED CONTROLS AND GAUGES Hydraulic Oil Temperature Gauge Meter (9) displays the hydraulic oil temperature. During operations, the indicator should be in the black range (A) to (C). If the indicator enters red range (A) during operations, the hydraulic oil temperature as gone above 102°C (215.6°F).
Page 71 OPERATION DETAILED CONTROLS AND GAUGES Monitor Switches Portion Working mode selector switch (basic switch) Has no function Auto-deceleration switch (selection switch) j Back switch Travel speed selector switch Up switch Wiper switch (10) Down switch Window washer switch (11) Input confirmation switch Maintenance switch (12) Adjusting brightness and contrast...
Page 72 The monitor display on display portion (A) changes for each mode. If it is desired to have the working mode set to start automatically in E, L, or B mode (default option setting), have your Komatsu distributor change the setting. REMARK...
Page 73 OPERATION DETAILED CONTROLS AND GAUGES Auto-deceleration Switch (Selection Switch) When switch (2) is pressed, the auto-deceleration is actuated, if the control levers are in neutral position, the engine speed is automatically lowered to reduce fuel consumption. Monitor display portion (A) ON : Auto-deceleration actuated Monitor display portion (A) OFF : Auto-deceleration canceled Each time the switch is pressed, auto-deceleration switches between actuated and canceled.
Page 74 OPERATION DETAILED CONTROLS AND GAUGES Travel Speed Selector Switch WARNING When loading or unloading from a trailer, always travel at low speed (with travel speed selector switch (3) at the Lo position). Never operate travel speed selector switch (3) while loading or unloading. If the travel speed is switched between Hi and Lo when the machine is traveling, the machine may deviate to one side, even when traveling in a straight line.
Page 75 If the wiper does not work when switch (4) is turned ON, wiper setting on the monitor is probably not correct, have your Komatsu distributor change the setting. Window Washer Switch This switch (5) is kept continuously pressed, window washer fluid is sprayed out on the front glass.
Page 76 OPERATION DETAILED CONTROLS AND GAUGES Maintenance Switch Switch (6) is used to check the time remaining until maintenance. When switch (6) is pressed, screen on the monitor display changes to the maintenance screen, as shown in diagram on the right. The time remaining until maintenance is indicated by the color of each monitor display.
Page 77 OPERATION DETAILED CONTROLS AND GAUGES If it is desired to change settings for the maintenance interval, have your Komatsu distributor change the settings. The method of checking time remaining until maintenance is as follows: 1. Look at the maintenance screen, press up switch (9) or down switch (10) on the monitor switch portion, and select the item.
Page 78 OPERATION DETAILED CONTROLS AND GAUGES Back Switch Press switch when maintenance mode, brightness/contrast adjustment mode, or select mode. The screen will return to the previous screen on the monitor display. Up Switch, Down Switch Press up switch (9) or down switch (10) when in the maintenance mode, brightness/contrast adjustment mode, or select mode to move the cursor on the monitor display (colors of selected monitor are inverted) up, down, left, or right.
Page 79 OPERATION DETAILED CONTROLS AND GAUGES Liquid Crystal Monitor Adjustment Switch Press switch (12) to adjust the brightness or contrast of the display monitor. Adjusting brightness and contrast 1.When monitor adjustment switch (12) is pressed, the monitor display screen changes to the brightness/contrast screen shown in the diagram on the right.
Page 80 OPERATION DETAILED CONTROLS AND GAUGES Adjusting contrast 2.Use the brightness/contrast screen and press up switch (9) or down switch (10) to select the contrast monitor. (The selected monitor is inverted to black.) 3.When the screen changes to the contrast adjustment screen, press up switch (9) or down switch (10) to adjust the contrast.
Page 81: Switches
OPERATION DETAILED CONTROLS AND GAUGES SWITCHES Starting switch (10) Emergency pump drive switch Fuel control dial (11) Swing brake cancel switch Cigarette lighter (12) Rotating lamp switch (if equipped) Swing lock switch (13) Boom shockless control switch Lamp switch (14) Lower wiper switch Alarm buzzer stop switch (Fixed front window cab specification)
Page 82 OPERATION DETAILED CONTROLS AND GAUGES Starting Switch Starting switch (1) is used to start or stop the engine. (A): OFF position The key can be inserted or withdrawn. Switches for the electrical system (except room lamp), are all turned off and the engine is stopped.
Page 83 OPERATION DETAILED CONTROLS AND GAUGES Swing Lock Switch WARNING When the machine is traveling under its own power, or when the swing is not being operated, always set the switch to the ON position (a). On slopes, even when the swing lock switch is at the ON position (a), the weight of the work equipment may cause the upper structure to swing if the swing control lever is operated in the downhill direction.
Page 84 OPERATION DETAILED CONTROLS AND GAUGES Machine Push-up Switch WARNING When using the boom thrust force to push up the chassis when moving down from a bench, there is danger that the machine may suddenly go down and turn over, so set to the high-pressure setting. This switch (7) is used to switch the safety valve set pressure at the head end of the boom cylinder to two levels.
Page 85 OPERATION DETAILED CONTROLS AND GAUGES Emergency Pump Drive Switch NOTICE Emergency pump drive switch is provided to make it possible to perform work for a short time when there is a failure in the pump control system. It is necessary to repair the abnormal location as soon as possible. Switch (10) makes it possible to temporarily perform operations should any abnormality occur in the pump control system (when monitor display shows E02).
Page 86 (both INT and ON) and wiper will be actuated in turn. When the monitor wiper switch is turned ON, if the lower wiper is actuated, wiper setting on the monitor is probably incorrect, have your Komatsu distributor change the setting. 3 - 33...
Page 87 OPERATION DETAILED CONTROLS AND GAUGES Large Capacity Airflow Air Conditioner Blower Switch (if equipped) Switch (14) operates the large capacity airflow air conditioner blower. (a) ON: Large-capacity air conditioner blower is actuated (b) OFF: Large-capacity air conditioner blower is stopped Step Light Switch Use switch (15) when dismounting the machine at night.
Page 88: Control Levers And Pedals
OPERATION DETAILED CONTROLS AND GAUGES CONTROL LEVERS AND PEDALS Lock lever Left work equipment control lever Travel levers (with auto-deceleration system) (with a pedal and auto-deceleration system) Right work equipment control lever (with auto-deceleration system) Lock Lever WARNING When standing up from the operator's seat, push lock lever (1) down securely to set it to LOCK position (L).
Page 89 OPERATION DETAILED CONTROLS AND GAUGES Travel Levers (with Pedals and Auto-deceleration Device) WARNING Do not rest your foot on the pedal during operations. If the pedal is depressed by mistake, the machine may suddenly move and cause a serious accident. Be extremely careful when operating the pedal for travel or steering operations.
Page 90 OPERATION DETAILED CONTROLS AND GAUGES Work Equipment Control Lever Left work equipment control lever (3) is used to operate the arm and upper structure. Arm operation (a) Arm OUT (b) Arm IN Swing operation (c) Swing to right (d) Swing to left N (Neutral) : The upper structure and arm are held in position and do not move.
Page 91: Sun Roof
OPERATION DETAILED CONTROLS AND GAUGES SUN ROOF (PC750-7, PC750LC-7, PC750SE-7 full cab specification machine only) WARNING When standing up from the operator's seat, push lock lever (1) down securely to set it to LOCK position (L). If lock lever (1) is at the FREE position (F) and the control lever is touched by mistake, this may lead to a serious accident.
Page 92: Windshield
OPERATION DETAILED CONTROLS AND GAUGES WINDSHIELD (PC750-7, PC750LC-7, PC750SE-7 full cab specification machine only) WARNING When opening or closing the front window, bottom window, or door, always set lock lever (1) to LOCK position (L). If the control levers are not locked and they are touched by accident, this may lead to a serious accident.
Page 93 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES 4. Grip handles (A) at the top right and left of the front window, and pull lock lever (B) toward yourself to release the lock at the top of the front window. The top of the front window will come out.
Page 94 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES 5. Hold lower knob (C) with your left hand from inside the operator's cab, and with your right hand, grip top knob (D), pull it up, and push it against lock catch (E) at the rear of the cab securely to lock the window.
Page 95 OPERATION DETAILED CONTROLS AND GAUGES Closing WARNING When closing the window, lower it slowly and be careful not to get your hand caught. 1. Stop the machine on level ground, lower the work equipment completely to the ground, then stop the engine. 2.
Page 96 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES 5. When the bottom of the window reaches the top of the bottom window, push the top of the window to the front to push it against left and right lock catches (G) and engage the lock. 6.
Page 97: Emergency Exit From Operator's Cab
OPERATION DETAILED CONTROLS AND GAUGES EMERGENCY EXIT FROM OPERATOR'S CAB If for some reason, the cab door does not open, remove the rear window and use it as an emergency escape. Remove the rear window as follows. 1. Pull ring (1) and completely remove seal (2) from the rubber core.
Page 98: Cap With Lock
OPERATION DETAILED CONTROLS AND GAUGES CAP WITH LOCK Use the starting switch key to open and close the locks on the caps and covers. For details of the locations of the caps and covers with locks, see "LOCKING (PAGE 3-131)". Insert the key as far as it will go to the shoulder (A).
Page 99: Hot And Cool Box
OPERATION DETAILED CONTROLS AND GAUGES Opening and Closing Cover with Lock Opening the Cover (Locked Cover) 1. Insert the key into the key slot. 2. Turn the key counterclockwise and open the cover by pulling the cover grip. (A): Open (B): Lock Locking the Cover 1.
Page 100: Ashtray
OPERATION DETAILED CONTROLS AND GAUGES ASHTRAY This is under the machine monitor at the front right of the operator's compartment. Always make sure that you extinguish your cigarette, then put it in the ashtray and close the lid. 3 - 47...
Page 101: Air Conditioner Controls
OPERATION DETAILED CONTROLS AND GAUGES AIR CONDITIONER CONTROLS Air Conditioner Control Panel OFF switch FRESH/RECIRC selector switch Fan switch Display monitor Temperature control switch Air conditioner switch Vent selector switch Defroster selector lever Auto switch When the function of the switch is actuated, the pilot lamp for the switch lights up. OFF Switch Switch (1) is used to stop the fan and air conditioner.
Page 102 OPERATION DETAILED CONTROLS AND GAUGES Fan Switch Switch (2) is used to adjust the air flow. The air flow can be adjusted to six levels. Press the ∧ switch to increase the air flow; press the ∨ switch to reduce the air flow. During auto operation, the air flow is automatically adjusted.
Page 103 OPERATION DETAILED CONTROLS AND GAUGES Vent Selector Switch Switch (4) is used to select the vents. When switch (4) is pressed, the display on monitor display (7) switches and air blows out from the vents displayed. During automatic operation, the vents are automatically selected.
Page 104 OPERATION DETAILED CONTROLS AND GAUGES Auto Switch With switch (5), the air flow, vents, and air source (RECIRC/FRESH) are automatically selected according to the set temperature. When auto switch (5) is pressed, the lamp above the auto switch lights up. Press switch (5), then use temperature control switch (3) to set the temperature, and run the air conditioner under automatic control.
Page 105 OPERATION DETAILED CONTROLS AND GAUGES Air Conditioner Switch Switch (8) is used to turn the air conditioner (cooling, dehumidifying, heating) ON or OFF. When the fan is actuated (display (b) is shown) and air conditioner switch (8) is pressed, the air conditioner is switched ON, lamp above the air conditioner switch lights up, and the air conditioner starts.
Page 106 OPERATION DETAILED CONTROLS AND GAUGES Method of Operation The air conditioner can be operated automatically or manually. Select the method of operation as desired. Automatic Operation 1. Turn auto switch (5) ON. The lamp above switch (5) lights up. The set temperature (a) and air flow (b) are displayed on the monitor.
Page 107 OPERATION DETAILED CONTROLS AND GAUGES Stopping Automatic Operation Press OFF switch (1). The displays for temperature setting (a) and air flow (b) on monitor (7), and lamps above auto switch (5) and air conditioner switch (8) go out, the operation stops. Manual Operation 1.
Page 108 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES 3. Press temperature setting switch (3) and adjust temperature inside the cab. 4. Press vent selector switch (4) and select the desired vents. When this is done, the display for vent (c) of the display monitor changes according to the selection.
Page 109 OPERATION DETAILED CONTROLS AND GAUGES Stopping Manual Operation Press OFF switch (1). The displays for temperature setting (a) and air flow (b) on monitor (7), and lamps above auto switch (5) and air conditioner switch (8) go out, the operation stops. Operation with Cold Air to Face and Warm Air to Feet To operate with cold air blowing to the face and warm air blowing to the feet, set as follows.
Page 110 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES 3. Turn air conditioner switch (8) ON. Check that the lamp above air conditioner switch lights up. 4. Adjust fan switch (2), temperature setting switch (3) and RECIRC/FRESH selector switch (6) to the desired positions. Defroster Operation 1.
Page 111 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES 2. Press vent selector switch (4) and set vent display on the display monitor to (f) or (g) as shown in diagram on the right. 3. Press RECIRC/FRESH selector switch (6) and set it to take in fresh air.
Page 112 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES When operating in the rainy season or when it is desired to remove the mist from the window glass or to dehumidify the air, turn air conditioner switch (8) ON. Use Air Conditioner with Care NOTICE When running the air conditioner, always start with the engine running at low speed.
Page 113 " portion of temperature setting switch (3) to display the failures in turn. After completing the troubleshooting, press OFF switch (1) again to return to the normal display. If any problem is detected by the self-diagnostic function, contact your Komatsu distributor perform inspection and repair. 3 - 60...
Page 114 OPERATION DETAILED CONTROLS AND GAUGES Function to Switch Set Temperature Display Between Fahrenheit and Celsius It is possible to switch the set temperature display between °F and °C. ∨ ∧ If the " " and " " portions of temperature setting switch (3) are pressed at the same time for more than 5 seconds while the fan is running, the temperature display will switch between °F and °C.
Page 115: Radio
OPERATION DETAILED CONTROLS AND GAUGES RADIO Control Panel Power switch, Volume control knob, Balance AS/PS button control knob Preset station buttons (1,2,3,4,5,6) SEL button Display FM/AM selection button Time reset button Display selection button Tuning button Power switch, Volume control knob, Balance control knob Press this knob (1) to turn the power for the radio on.
Page 116 OPERATION DETAILED CONTROLS AND GAUGES Display Selection Button (TIME) On this machine, priority is given to the frequency display. When the frequency is being displayed, press button (4) and the display will show the present time for 5 seconds. After 5 seconds pass, the display returns automatically to the frequency display.
Page 117 OPERATION DETAILED CONTROLS AND GAUGES Controls of Radio Method of Setting with Preset Button 1. Press power switch (1) and display the frequency on display (7). 2. Use tuning button (9) to set to the desired frequency. There are two methods for tuning: auto tuning and manual tuning. 3.
Page 118 OPERATION DETAILED CONTROLS AND GAUGES Method of Operating Mode (BAS) Bass adjustment: When button (2) is pressed, BAS is displayed on display (7). If knob (1) is turned clockwise within 5 seconds, the bass sound is emphasized. If the knob is turned counterclockwise, the bass sound is reduced.
Page 119 OPERATION DETAILED CONTROLS AND GAUGES Antenna NOTICE Before transporting the machine or putting it inside a building, stored the antenna to prevent any interference. Use Radio with Care To ensure safety, always keep the sound to a level where it is possible to hear outside sounds during operation. If water gets into the speaker case or radio, it may lead to an unexpected failure, so be careful not to get water on the equipment.
Page 120: Auxiliary Electric Power
OPERATION DETAILED CONTROLS AND GAUGES AUXILIARY ELECTRIC POWER 24V Power Source NOTICE Do not use this as the power supply for 12V equipment. It will cause failure of the equipment. Pull out the connector plug for taking out electric power from the rear side of the panel.
Page 121: Fuse
OPERATION DETAILED CONTROLS AND GAUGES FUSE NOTICE Before replacing a fuse, be sure to turn off the starting switch. The fuses protect the electrical equipment and wiring from burning out. If the fuse becomes corroded, or white powder can be seen, or the fuse is loose in the fuse holder, replace the fuse.
Page 122: Circuit Breaker
OPERATION DETAILED CONTROLS AND GAUGES CIRCUIT BREAKER NOTICE When resetting the circuit breaker, always turn the starting switch OFF first. If the starting switch does not work, even when the starting switch is turned on, open the circuit breaker box inside the grease pump box located at the front right of machine, and perform inspection.
Page 123: Controller
Do not let water, mud, or juice spill on the controller. This will cause failures. If any problem occurs in the controller, do not repair it by yourself. Please contact your Komatsu distributor for repairs. TOOL BOX (Cloth bag) This is inside the toolbox at the rear of the cab.
Page 124: Grease Pump
OPERATION DETAILED CONTROLS AND GAUGES GREASE PUMP This is stored inside the grease pump box on the right side of the chassis. Method of Use 1. When the engine is started, and the power switch (1) and remote switch (2) are turned to the ON position, pump (3) is actuated and grease is sent under pressure to grease gun (4).
Page 125 OPERATION OPERATION DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES The greasing condition can be checked with pressure gauges (5) and (6). (5): Green color (low pressure) (6): Red color (high pressure) 3. When the lever of grease gun (4) is released, the supply of grease stops. 4.
Page 126 OPERATION DETAILED CONTROLS AND GAUGES Supplying Grease 1. Remove bolts (2) at 2 places, then remove grease pump holder bracket (1). 2. Remove wing bolts (4) of grease can (3) at 3 places, then remove cover (5) together with the grease pump. 3.
Page 127: Accumulator
Do not hit it, roll it, or subject it to any impact. When disposing of the accumulator, the gas must be released. Contact your Komatsu distributor for proper disposal. This machine is equipped with an accumulator in the control circuit. The accumulator is a device to store oil pressure for the control circuit.
Page 128: Machine Operations And Controls
Remove any flammable materials from around the battery, engine, muffler, turbocharger, or other high temperature engine parts. Leakage of fuel or oil will cause the machine to catch fire. Check carefully, be sure to repair any problem, or contact your Komatsu distributor.
Page 129 Check for damage or wear to the seat belt and mounting clamps. If there is any damage, replace with new parts. 10. Check bucket with hook (if equipped) for damage. Check for damage to the hook, guide, and hook mount. If any problem is found, contact your Komatsu distributor for repairs.
Page 130 OPERATION MACHINE OPERATIONS AND CONTROLS Checks Before Starting Always check the items in this section before starting the engine each day. Check Coolant Level, Add Coolant WARNING Do not open the radiator cap unless necessary. When checking the coolant, always wait for the engine to cool down and check the sub-tank.
Page 131 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS REMARK When adding coolant to the radiator, remove cover (5), slowly loosen radiator cap (6) to release the cooling system pressure. Then push cap (6) in and turn, then remove it. Check that the coolant level is above shaded portion in diagram on the right.
Page 132 OPERATION MACHINE OPERATIONS AND CONTROLS Check Oil Level in Engine Oil Pan, Add Oil WARNING Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil temperature to go down before performing this operation. 1.
Page 133 OPERATION MACHINE OPERATIONS AND CONTROLS Check Fuel Level, Add Fuel WARNING When adding fuel, never let the fuel overflow. This may cause a fire. If any fuel is spilled, wipe it up completely. Never bring flames near fuel because it is highly flammable and dangerous. 1.
Page 134 OPERATION MACHINE OPERATIONS AND CONTROLS Check for Water and Sediment in Water Separator, Drain Water (When additional fuel filter is installed) The water separator is installed at the bottom of the additional fuel filter. 1. It is possible to judge the water level and amount of sediment by looking through transparent cap (2).
Page 135 OPERATION MACHINE OPERATIONS AND CONTROLS Check Oil Level in Hydraulic Tank, Add Oil WARNING If the oil filler cap is removed without releasing the internal pressure, oil will spurt out, so turn the oil filler cap slowly to release the internal pressure, then remove it carefully. 1.
Page 136 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS WARNING If oil is above the H level, stop the engine, wait for the hydraulic oil to cool down, then drain excess oil from drain plug (P1). When draining the oil, loosen bottom drain plug (P1), then loosen side drain plug (P2) and drain the oil.
Page 137 OPERATION MACHINE OPERATIONS AND CONTROLS Check Oil Level in Swing Machinery Case, Add Oil WARNING Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil temperature to go down before performing this operation. 1.
Page 138 OPERATION MACHINE OPERATIONS AND CONTROLS 5. If oil is above the H mark on the oil level gauge, loosen drain plug (P) and drain the excess oil. When draining oil, pull out tube (1), then loosen drain plug (P). After draining the excess oil, store tube (1) inside hole (B).
Page 139 OPERATION MACHINE OPERATIONS AND CONTROLS Check Oil Level in PTO Case, Add Oil WARNING Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil temperature to go down before performing this operation. NOTICE Park the machine on flat ground and stop the engine.
Page 140 Always check if there is any accumulation of flammable material around the battery, and remove such flammable material. Please contact your Komatsu distributor for investigation and correction of the cause. Check Function of Horn 1. Turn the starting switch to the ON position.
Page 141 OPERATION MACHINE OPERATIONS AND CONTROLS Adjustment Seat Adjustment WARNING When adjusting the position of the operator's seat, always set the lock lever to the LOCK position to prevent any accidental contact with the control levers. Always adjust the operator's seat before starting each operation or when the operators change shift. Adjust the operator's seat so control levers and switches can be operated freely and easily with the operator's back against the backrest.
Page 142 OPERATION MACHINE OPERATIONS AND CONTROLS (D) Adjusting armrest angle Armrest (5) can be made to spring up by hand approx. 90°. In addition, by turning the bottom (6) of the armrest by hand it is possible to make fine vertical adjustments of the armrest angle.
Page 143 OPERATION MACHINE OPERATIONS AND CONTROLS Seat Belt WARNING Before fitting the seat belt, check that there is no problem in the belt mount bracket or mounting belt. If it is worn or damaged, replace the seat belt. Even if no problem can be seen in the belt, replace the seat belt every 3 years. The date of manufacture of the belt is shown on the back of the belt.
Page 144 OPERATION MACHINE OPERATIONS AND CONTROLS Operations Before Starting Engine WARNING When starting the engine, check that the lock lever (1) is securely at the LOCK position (L). If the control levers are not locked and they are touched by accident when starting the engine, the work equipment may move unexpectedly, and this may lead to a serious accident.
Page 145 If the monitors do not light up or the buzzer does not sound, there is probably a failure in the monitor, so contact your Komatsu distributor for repairs. 2) After approx. 3 seconds, the screen switches to the working mode/travel speed display monitor. Then it switches to the normal screen.
Page 146 Detailed controls and gauges. 5) Press lamp switch (18) and check that the front lamp lights If it does not light up, there is probably a blown bulb or disconnection, so contact your Komatsu distributor for repairs. 3 - 93...
Page 147: Starting Engine
OPERATION MACHINE OPERATIONS AND CONTROLS STARTING ENGINE Normal Starting WARNING Sit down in the operator's seat before starting the engine. Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause serious bodily injury or fire. Check that there are no persons or obstacles in the surrounding area, then sound the horn and start the engine.
Page 148 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 3. Turn the key in starting switch (3) to START position (C). The engine will start. 4. After the engine starts, release the key in starting switch (3). The key will automatically return to the ON position (B). 5.
Page 149 OPERATION MACHINE OPERATIONS AND CONTROLS Starting Engine in Cold Weather WARNING Start the engine only after sitting down in the operator's seat. Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause a serious bodily injury or fire.
Page 150 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 3. Hold the key in starting switch (3) at the HEAT position (D), and check that preheating monitor (4) lights up. After about 30 seconds, preheating monitor lamp (4) will flash to indicate that preheating is finished.
Page 151 OPERATION MACHINE OPERATIONS AND CONTROLS REMARK The actuation time for the turbo protect function and the relationship with the engine coolant temperature are as shown below. If the fuel control dial is operated within the time shown below, the engine speed will not change. Coolant temperature Turbo protect time (sec.) Above 10 °...
Page 152: After Starting Engine
OPERATION MACHINE OPERATIONS AND CONTROLS AFTER STARTING ENGINE WARNING If there has been any Emergency stop, abnormal actuation or trouble, turn the starting switch key to the OFF position. If the work equipment is operated without sufficiently warming the machine up, response of the work equipment to movement of the control lever will be slow, and the work equipment may not respond as the operator desires, so always perform the warming-up operation.
Page 153 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 3. Operate bucket control lever (3) and arm control lever (4) slowly to move the bucket cylinder and arm cylinder to the end of the stroke. 4. Operate the bucket for 30 seconds and the arm for 30 seconds in turn fully for 5 minutes.
Page 154 Hydraulic oil temperature monitor (18): Green display 7. Check for abnormal exhaust gas color, noise, or vibration. If any problem is found, contact your Komatsu distributor. 8. If air cleaner clogging monitor (16) lights up, clean or replace the element immediately.
Page 155 OPERATION MACHINE OPERATIONS AND CONTROLS Working mode monitor display 1) A mode For heavy-load operations 2) E mode For operations with emphasis on fuel economy 3) Heavy-duty lift Boom lifting power increased when raising boom independently 4) Swing priority mode Priority given to swing when operating boom and swing simultaneously 3 - 102...
Page 156 OPERATION MACHINE OPERATIONS AND CONTROLS In Cold Weather Areas (AUTOMATIC WARMING-UP OPERATION) When starting the engine in cold areas, carry out the automatic warming-up operation after starting the engine. When the engine is started, if the engine water temperature is low (below 30°C (86°F), the warming-up operation is performed automatically.
Page 157 Hydraulic oil temperature monitor (18): Green display 6. Check for abnormal exhaust gas color, noise, or vibration. If any problem is found, contact your Komatsu distributor. 7. If air cleaner clogging monitor (16) lights up, clean or replace the element immediately.
Page 158 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 8. Turn fuel control dial (2) to the full speed (MAX) position and perform step 4 for 3 - 5 minutes. 9. Repeat the following operation 3 - 5 times and operate slowly. RAISE ←→...
Page 159 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 3) Heavy-duty lift Boom lifting power increased when raising boom independently 4) Swing priority mode Priority given to swing when operating boom and swing simultaneously NOTICE Canceling automatic warm-up operation If it becomes necessary in an emergency to cancel the automatic warm-up operation or to lower the engine speed to low idle, do as follows.
Page 160: Stopping The Engine
OPERATION MACHINE OPERATIONS AND CONTROLS STOPPING THE ENGINE NOTICE If the engine is stopped abruptly, service life of component parts of the engine may be considerably reduced. Do not stop the engine abruptly except in an emergency. If the engine has overheated, do not try to stop it abruptly but run it at medium speed to allow it to cool down gradually, and then stop it.
Page 161: Machine Operation
OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATION Preparations for Moving the Machine WARNING Before operating the steering levers, check the direction of the track frame. If the sprocket is at the front, the operation of the travel levers is reversed. When moving the machine, check that the area around the machine is safe, and always sound the horn before moving.
Page 162 (6) to move the machine forward. 3. For machines equipped with a travel alarm, check that the alarm sounds. If the alarm does not sound, contact your Komatsu distributor for repairs. REMARK In cold temperatures, if the machine travel speed is not normal, thoroughly perform the warming-up operation.
Page 163 Slowly push the levers (5) forward, or slowly depress the front part of the pedals (6) to move the machine backward. 3. For machines equipped with a travel alarm, check that the alarm sounds. If the alarm does not sound, contact your Komatsu distributor for repairs. 3 - 110...
Page 164 OPERATION MACHINE OPERATIONS AND CONTROLS Stopping Machine Avoid stopping suddenly. Give yourself ample room when stopping. 1. Put the left and right travel levers (1) in the neutral position, then stop the machine. 3 - 111...
Page 165: Steering The Machine
OPERATION MACHINE OPERATIONS AND CONTROLS STEERING THE MACHINE Steering WARNING Before operating the travel levers, check the direction of the track frame (the position of the sprocket). If the sprocket is at the rear, the machine moves in the reverse direction to the operation of the travel levers. Use the travel levers to change direction.
Page 166 OPERATION MACHINE OPERATIONS AND CONTROLS Changing Direction of the Machine When turning to the left: If the left travel lever is returned to the neutral position, the machine will turn to the left. (A): Forward left turn (B): Reverse left turn REMARK When turning to the right, operate the right travel lever in the same way.
Page 167: Swinging
OPERATION MACHINE OPERATIONS AND CONTROLS SWINGING WARNING The tail of the machine extends outside the tracks. Before operating the swing, check that the area around the machine is safe. 1. Before starting the swing operation, turn swing lock switch (1) OFF and check that swing lock monitor (2) has gone out.
Page 168: Work Equipment Controls And Operations
OPERATION MACHINE OPERATIONS AND CONTROLS WORK EQUIPMENT CONTROLS AND OPERATIONS WARNING If the lever is operated when the engine speed has been lowered by the auto-deceleration function, the engine speed will suddenly rise, so operate the levers carefully. The work equipment is operated by the left and right work equipment control levers. The left work equipment control lever operates the arm and swing, and the right work equipment control lever operates the boom and bucket.
Page 169 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS Boom operation Bucket operation 3 - 116...
Page 170: Working Mode
OPERATION MACHINE OPERATIONS AND CONTROLS WORKING MODE Working Mode The mode selector switch can be used to switch the mode to match operating conditions and purpose, thereby enabling work to be performed efficiently. Make effective use of each mode as follows. When the starting switch is turned to the ON position, the working mode is set to A mode (digging).
Page 171: Prohibited Operations
OPERATION MACHINE OPERATIONS AND CONTROLS PROHIBITED OPERATIONS WARNING If it is necessary to operate the work equipment control lever when the machine is traveling, stop the machine, then operate the control lever. If any lever is operated when the auto-deceleration is being actuated, the engine speed will suddenly increase, so be careful when operating.
Page 172 OPERATION MACHINE OPERATIONS AND CONTROLS Operations Using Bucket Dropping Force Do not use the dropping force of the machine for digging, or use the dropping force of the bucket as s pickaxe, breaker, or pile driver. This will drastically reduce the life of the machine. Operations Using Machine Dropping Force Do not use the dropping force of the machine for digging.
Page 173 OPERATION MACHINE OPERATIONS AND CONTROLS Sudden Lever Shifting High Speed Travel (1) Never carry out sudden lever shifting as this may cause sudden starting. (2) Avoid sudden lever shifting from forward (A) to reverse (B) (or from reverse (B) to forward (A)). (3) Avoid sudden lever shifting change such as sudden stopping from near top speed (lever release operation).
Page 174: General Operation Information
OPERATION MACHINE OPERATIONS AND CONTROLS GENERAL OPERATION INFORMATION Traveling Traveling over boulders, tree stumps, or other obstacles will cause a big shock to the chassis (and in particular to the tracks), and this will cause damage to the machine. For this reason, always remove any obstacles or travel around them, or take other steps to avoid traveling over such obstacles as far as possible.
Page 175 OPERATION MACHINE OPERATIONS AND CONTROLS Permissible Water Depth NOTICE When driving the machine out of water, if the angle of the machine exceeds 15°, the rear of the upper structure will go under water, and water will be thrown up by the cooling fan. This may cause the fan to break. Be extremely careful when driving the machine out of water.
Page 176: Traveling On Slopes
OPERATION MACHINE OPERATIONS AND CONTROLS TRAVELING ON SLOPES WARNING Turning or operating the work equipment when working on slopes may cause the machine to lose it balance and turn over, so avoid such operations. It is particularly dangerous to swing downhill when the bucket is loaded. If such operations have to be performed, pile soil to make a platform (A) on the slope so the machine is kept horizontal during operation.
Page 177 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS When traveling up a steep slope, extend the work equipment to the front to improve the balance, keep the work equipment approximately 20 to 30 cm (8 to 12 in) above the ground, and travel at low speed.
Page 178: Escape From Mud
OPERATION MACHINE OPERATIONS AND CONTROLS ESCAPE FROM MUD When operating, be careful not to get stuck in mud. If the machine gets stuck in mud, do as follows to get the machine out. If machine push-up switch (1) is turned ON, the pushing force of the boom is increased and it becomes easier to escape.
Page 179: Recommended Applications
OPERATION MACHINE OPERATIONS AND CONTROLS RECOMMENDED APPLICATIONS In addition to the following, it is possible to further increase the range of applications by using various attachments. Backhoe Work A backhoe is suitable for excavating areas that are lower than the machine.
Page 180: Bucket Replacement
OPERATION MACHINE OPERATIONS AND CONTROLS BUCKET REPLACEMENT WARNING When pins are knocked in with a hammer, pieces of metal may fly and cause serious injury. When carrying out this operation, always wear goggles, hard hat, gloves, and other protective equipment. When the bucket is removed, place it in a stable condition.
Page 181 OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 3. Align the arm with holes (1) of the replacement bucket and the link with holes (2), then insert grease-coated pins (A) and (B) into hole (1) and hole (2) respectively. REMARK Carry out installation in the reverse order to removal.
Page 182: Parking Machine
OPERATION MACHINE OPERATIONS AND CONTROLS PARKING MACHINE WARNING Avoid stopping suddenly. Give yourself ample room when stopping. When stopping the machine, select flat hard ground and avoid dangerous places. If it is unavoidably necessary to park the machine on a slope, insert blocks underneath the track shoes. As an additional safety measure, thrust the bucket into the ground.
Page 183: Check After Shut Off Engine
OPERATION OPERATION MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS 3. Lower the bucket horizontally until the bottom touches the ground. 4. Set lock lever (3) in the LOCK position. CHECK AFTER SHUT OFF ENGINE Check the engine coolant temperature, engine oil pressure, and fuel level on the machine monitor.
Page 184: Locking
OPERATION MACHINE OPERATIONS AND CONTROLS LOCKING Always lock the following places. (1) Door of operator's cab Always remember to close the window. (2) Fuel tank filler port (3) Engine hood (3 places) (4) Battery box cover (2 places) (5) Left side door of the machine (2 places) (6) Tool box side cover (7) Hydraulic tank filler port REMARK...
Page 185: Transportation
TRANSPORTATION When transporting the machine, observe all related laws and regulations, and be careful to assure safety. PRECAUTIONS FOR TRANSPORTATION WARNING This machine must be disassembled for transportation. When transporting the machine, please consult your Komatsu distributor. 3 - 132...
Page 186: Lifting Machine
This method of lifting applies to the standard specification machine. The method of lifting differs according to the attachments and options installed. For details of the procedure for machines that are not the standard specification, please consult your Komatsu distributor. For weight, see "SPECIFICATIONS (PAGE 5-2)".
Page 187 OPERATION TRANSPORTATION 3. Combination of wire rope (cable) length The length of wire rope (cable) is the length from the pin to center of the hole. When using the following wire rope, use wire rope with more length than given in chart below. In addition, select a wire rope length that will bring the lifting position directly above the center of gravity of the machine.
Page 188: Shipping Machine Information
OPERATION TRANSPORTATION SHIPPING MACHINE INFORMATION WARNING When loading the machine, choose firm level ground. Keep well away from the road shoulder. Run the engine at low speed and operate slowly. After placing the machine on the specified position of the trailer, secure it according to the following procedure. 1.
Page 189: Transportation Posture
OPERATION TRANSPORTATION TRANSPORTATION POSTURE This machine can be divided into three or four units for transportation. When transporting, contact your Komatsu distributor. Three Units for Transportation Four Units for Transportation 3 - 136...
Page 190 OPERATION TRANSPORTATION Posture for Each Unit Upper Structure + Undercarriage PC750-7 PC800-7 Item Unit PC750LC-7 PC750SE-7 PC800SE-7 Overall 3,490 3,490 3,490 width (ft in) (11'5") (11'5") (11'5") 3,620 3,620 3,620 (ft in) (11'11") (11'11") (11'11") 6,840 6,840 7,100 (ft in) (22'5")
Page 191 OPERATION TRANSPORTATION Work Equipment Boom PC750-7 PC750SE PC800-7 PC800SE Item Unit PC750LC-7 8,505 7,405 8,345 7,405 (ft in) (27'11") (24'4") (27'5") (24'4") 2,610 2,465 2,600 2,465 (ft in) (8'7") (8'1") (8'6") (8'1") Overall 1,500 1,500 1,500 1,500 width (ft in) (4'11")
Page 192 OPERATION TRANSPORTATION Boom cylinder (same for all models) PC750-7 PC800-7 Item Unit PC750SE-7 PC800SE-7 PC750LC-7 3,235 3,235 (ft in) (10'7") (10'7") 1,580 1,580 (790x‚Q) (790x‚Q) Weight [lb] [3,484 [3,484 (1,742x2)] (1,742x2)] Arm cylinder PC750SE-7 PC750-7 Item Unit PC800-7 PC750LC-7 PC800SE-7...
Page 193 (ft in) (0'11") (ft in) (3'3") Weight (lb) (121) Radiator duct (1) (same for all models) PC750-7 PC800-7 Item Unit PC750SE-7 PC800SE-7 PC750LC-7 1,600 1,600 (ft in) (5'3") (5'3") (ft in) (0'3") (0'3") 1,090 1,090 (ft in) (3'7") (3'7") Weight...
Page 194 OPERATION TRANSPORTATION Catwalk (1) (same for all models) PC750-7 PC800-7 Item Unit PC750SE-7 PC800SE-7 PC750LC-7 3,200 3,200 (ft in) (10'6") (10'6") (ft in) (1'8") (1'8") Weight (lb) (110) (110) Catwalk (2) (same for all models) PC750-7 PC800-7 Item Unit PC750SE-7...
Page 195: Procedure For Increasing Or Reducing Track Frame Gauge
OPERATION TRANSPORTATION PROCEDURE FOR INCREASING OR REDUCING TRACK FRAME GAUGE WARNING Never use the machine for operations with the track frame retracted. Reducing Track Gauge 1. Remove center frame mounting bolts (1). (one side, front + rear: 20 bolts) 2. Swing the upper structure so that it is at 90° on the side of track frame (A) to be retracted, then use the work equipment to jack up the track frame.
Page 196 OPERATION TRANSPORTATION Increasing Track Gauge 1. Remove center frame mounting bolts (2) (one side, front + rear: 8 bolts) from the front and rear of the track frame on the side to be extended. 2. Swing the upper structure so that it is at 90° on the opposite side to track frame (A) to be extended.
Page 197: Cold Weather Operation
When changing the coolant or when handling coolant containing antifreeze that has been drained when repairing the radiator, please contact your Komatsu distributor or request a specialist company to carry out the operation. Antifreeze is toxic. Do not let it flow into drainage ditches or spray it onto the ground surface.
Page 198 OPERATION COLD WEATHER OPERATION Battery WARNING The battery generates flammable gas. Do not bring fire or sparks near the battery. Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount of water and consult a doctor.
Page 199 OPERATION COLD WEATHER OPERATION Monitor A feature of the liquid crystal monitor is that the screen becomes dark and is difficult to read in cold weather (particularly with the starting switch ON). In this case, adjust the brightness and contrast of the screen. For details, see "Liquid Crystal Monitor Adjustment Switch (PAGE 3-26)".
Page 200: After Daily Work Completion
OPERATION COLD WEATHER OPERATION AFTER DAILY WORK COMPLETION WARNING Performing idle-running of the tracks is dangerous, stay well away from the tracks. To prevent mud, water, or the undercarriage from freezing and making it impossible for the machine to move on the following morning, observe the following precautions.
Page 201: Long Term Storage
Rotate the tracks. AFTER STORAGE NOTICE If the machine has been stored without carrying out the monthly rust-prevention operation, consult your Komatsu distributor before using it. When using the machine after long-term storage, do as follows before using it. Wipe off the grease from the hydraulic cylinder rods.
Page 202: Starting Machine After Long-Term Storage
OPERATION LONG TERM STORAGE STARTING MACHINE AFTER LONG-TERM STORAGE When starting the engine after the machine has been in storage for a long time, perform the automatic warming-up operation. If the engine is started according to the starting procedure for cold weather, the warming-up operation is performed automatically.
Page 203: Troubles And Actions
OPERATION TROUBLES AND ACTIONS TROUBLES AND ACTIONS RUNNING OUT OF FUEL When starting the engine again after running out of fuel, fill with fuel, then bleed the air from the fuel system before starting the engine. Always watch the fuel level and be careful not to run out of fuel. If the engine has stopped because of lack of fuel, it is necessary to use the priming pump to bleed the air completely from the fuel circuit.
Page 204: Phenomena That Are Not Failures
OPERATION TROUBLES AND ACTIONS 9. Push in the knob of priming pump (2) and tighten it. 10. Turn the key in the starting switch to the START position and start the engine. When doing this, do not crank the starting motor continuously for more than 20 seconds. If the engine does not start, wait for at least 2 minutes, then try again.
Page 205: Towing The Machine
OPERATION TROUBLES AND ACTIONS TOWING THE MACHINE WARNING Serious injury or death could result if a disabled machine is towed incorrectly or if there is a mistake in the selection or inspection of the wire rope. Always check that the wire rope used for towing has ample strength for the weight of the machine being towed.
Page 206: Discharged Battery
OPERATION TROUBLES AND ACTIONS DISCHARGED BATTERY WARNING It is dangerous to charge a battery when installed on a machine. Make sure that it is removed before charging. When checking or handling the battery, stop the engine and turn the starting switch key to the OFF position. The battery generates hydrogen gas, so there is a hazard of explosion.
Page 207 OPERATION TROUBLES AND ACTIONS Battery Charges When charging the battery, if the battery is not handled correctly, there is a hazard that the battery may explode. Always follow the instructions of "DISCHARGED BATTERY (PAGE 3-153)" and the instruction manual accompanying the charger, and do as follows. Set the voltage of the charger to match the voltage of the battery to be charged.
Page 208 OPERATION TROUBLES AND ACTIONS Starting Engine with Booster Cables When starting the engine with a booster cable, do as follows. Connecting and Disconnecting Booster Cables WARNING When connecting the cables, never contact the positive (+) and negative (-) terminals. When starting the engine with a booster cable, always wear safety glasses.
Page 209 OPERATION TROUBLES AND ACTIONS Starting the Engine CAUTION Always check that the lock lever is set to the LOCK position, regardless of whether the machine is working normally or has failed. Check also that all the control levers are at the HOLD or neutral position. 1.
Page 210: Other Trouble
TROUBLES AND ACTIONS OTHER TROUBLE Electrical System ( ): Always contact your Komatsu distributor when dealing with these items. In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs. Problem Main causes Remedy...
Page 211 OPERATION TROUBLES AND ACTIONS Chassis ( ): Always contact your Komatsu distributor when dealing with these items. In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs. Problem Main causes Remedy Speed of travel, swing, boom, arm,...
Page 212 OPERATION TROUBLES AND ACTIONS Engine ( ): Always contact your Komatsu distributor when dealing with these items. In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs. Problem Main causes Remedy Engine oil pressure monitor lights...
Page 213 Air entering suction side of fuel line There is knocking Poor quality fuel being used (combustion or mechanical) Overheating Error code is displayed on monitor Alarm buzzer sounds Contact your Komatsu distributor Engine suddenly loses power (entered delayed mode) 3 - 160...
Page 214 OPERATION TROUBLES AND ACTIONS Electronic Control System If an error code is displayed on the machine monitor display, follow the self-diagnostic remedy table below. Machine Monitoring System Monitor Failure mode Remedy display TVC valve system error When emergency pump drive switch is up, normal operations become normal, but carry out inspection immediately.
Page 215 Check the point of contact telephone number on screen B. REMARK If the point of contact telephone number has not been registered, screen B is not displayed. If it is necessary to register the point of contact telephone number, ask your Komatsu distributor to register it. 3 - 162...
Page 216 4 - 1...
Page 217: Maintenance
Use Komatsu genuine parts specified in the Parts Book as replacement parts. Komatsu Genuine Lubricants For lubrication of the machine, use the Komatsu genuine lubricants. Moreover use oil of the specified viscosity according to the ambient temperature. Windshield Washer Fluid Use automobile window washer fluid, and be careful not to let any dirt get into it.
Page 218 MAINTENANCE MAINTENANCE INFORMATION Dusty Jobsite When working at dusty worksites, do as follows: Inspect the air cleaner clogging monitor frequently to see if the air cleaner is clogged. Clean the radiator core frequently to avoid clogging. Clean and replace the fuel filter frequently. Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
Page 219: Outline Of Service
(whole amount). The hydraulic oil that is not recommended by Komatsu can cause clogging of oil filter, so do not use it. The portion of the oil that remains in the piping or cylinders will not be a problem even though it will be mixed into new oil.
Page 220 Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would cause wear of the rotating parts. Carrying Out KOWA (Komatsu Oil Wear Analysis) KOWA is a maintenance service that makes it possible to prevent machine failures and downtime. With KOWA, the oil is periodically sampled and analyzed.
Page 221: Electric System Maintenance
Service relating to the electric system is checking fan belt tension, checking damage or wear to the fan belt and checking battery fluid level. Never install any electric components other than those specified by Komatsu. External electro-magnetic interference may cause malfunction of the control system controller, before installing a radio receiver or other wireless equipment, contact your Komatsu distributor.
Page 222: Wear Parts
When replacing parts, always use Komatsu genuine parts. As a result of our continuous efforts to improve product quality, the part number may change, so inform your Komatsu distributor of the machine serial number and check for the latest part number when ordering parts. 4 - 7...
Page 223: Wear Parts List
MAINTENANCE WEAR PARTS WEAR PARTS LIST The parts in parentheses are to be replaced at the same time. Item Part No. Part Name Q'ty Replacement frequency 209-60-77530 Element Hydraulic oil filter Every 1000 hours (07000-05180) (O-ring) Drain filter 209-60-76210 Cartridge Every 500 hours 424-16-11140 Element...
Page 224: Lubricants, Fuel And Coolant Specifications
MAINTENANCE LUBRICANTS, FUEL AND COOLANT SPECIFICATIONS LUBRICANTS, FUEL AND COOLANT SPECIFICATIONS PROPER SELECTION *1: ASTM D975 No. 1 *2 Use only diesel fuel. NOTICE Use only diesel fuel. The engine mounted on this machine employs electronic control and a high-pressure fuel injection device to obtain good fuel consumption and good exhaust gas characteristics.
Page 225 There is no problem if single grade oil is mixed with multigrade oil (SAE10W-30, 15W-40), but be sure to add single grade oil that matches the temperature range in the table. We recommend Komatsu genuine oil which has been specifically formulated and approved for use in engine and hydraulic work equipment applications.
Page 226 SAE80, 90, 140 NLGI No.2 Base] (The 15W40 oil Permanent Type marked * is CE.) EO10-CD AF-ACL EO30-CD GO90 G2-LI AF-PTL KOMATSU EO10-30CD GO140 G2-LI-S AF-PT(Winter, one EO15-40CD season type) Diesel sigma S super dieselmulti- AGIP Rotra MP GR MU/EP...
Page 227 MAINTENANCE MAINTENANCE LUBRICANTS, FUEL AND COOLANT SPECIFICATIONS LUBRICANTS, FUEL AND COOLANT SPECIFICATIONS Engine Oil Anti-freeze [CD or CE] Gear Oil Grease Coolant SAE10W, 30, 40 No. Supplier [GL-4 or GL-5] [Lithium-Base] [Ethylene Glycol 10W30, 15W40 SAE80, 90, 140 NLGI No.2 Base] (The 15W40 oil Permanent Type...
Page 228: Tightening Torque Specifications
Unless otherwise specified, tighten the metric nuts and bolts to the torque shown in the table below. If it is necessary to replace any nut or bolt, always use a Komatsu genuine part of the same size as the part that was replaced.
Page 229: Safety Critical Parts
When replacing hoses, always replace O-rings, gaskets, and other such parts at the same time. Have your Komatsu distributor replace the critical parts. Check the hydraulic and fuel hoses when performing the following periodic inspections.
Page 230: Safety Critical Parts List
MAINTENANCE SAFETY CRITICAL PARTS SAFETY CRITICAL PARTS LIST Safety critical parts for periodic replacement Q'ty Replacement interval 1 Fuel hose (fuel tank - strainer) 2 Fuel hose (strainer - priming pump) 3 Fuel hose (priming pump - supply pump) 4 Fuel return hose (injection pump - fuel cooler) Every 4000 hours or 2 years, whichever comes sooner 5 Fuel return hose (fuel cooler - fuel tank)
Page 231: Maintenance Schedule
MAINTENANCE MAINTENANCE SCHEDULE MAINTENANCE SCHEDULE MAINTENANCE SCHEDULE CHART INITIAL 100 HOURS MAINTENANCE (ONLY AFTER THE FIRST 100 HOURS) CLEAN STRAINER OF PTO LUBRICATING OIL FILTER 4- 61 INITIAL 500 HOURS MAINTENANCE (ONLY AFTER THE FIRST 500 HOURS) CHANGE OIL IN SWING MACHINERY CASE 4- 71 CHANGE OIL IN PTO CASE 4- 73...
Page 232 MAINTENANCE MAINTENANCE SCHEDULE CLEAN AND INSPECT RADIATOR FINS, OIL COOLER FINS, AFTER COOLER FINS, FUEL COOLER FINS, AND CONDENSER FINS (ONLY MACHINES EQUIPPED WITH AIR CONDITIONER) 4- 57 CLEAN FRESH/RECIRC AIR FILTERS OF AIR CONDITIONER (ONLY FOR MACHINES EQUIPPED WITH AIR CONDITIONER) 4- 58 REPLACE PILOT FILTER ELEMENT 4- 60...
Page 233: Maintenance Procedure
Change oil in PTO case Change oil in final drive case Special tools are needed for inspection and maintenance, so contact your Komatsu distributor. For details of the method of replacing or maintaining, see EVERY 1000 HOURS and EVERY 2000 HOURS SERVICE.
Page 234: When Required
MAINTENANCE MAINTENANCE PROCEDURE WHEN REQUIRED CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT WARNING When using compressed air, there is danger of dirt flying and causing personal injury. Always wear protective glasses, dust mask, or other protective equipment. When removing the outer element from the air cleaner body, it is dangerous to pull it out by force. When working in high places or where the foothold is poor, be careful not to fall because of the reaction when pulling out the outer element.
Page 235 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE NOTICE Never remove the inner element (5). It will allow dirt to enter and cause failure of the engine. Do not use a screwdriver or other tool. 3. After removing the outer element (6), cover the air connector inside the air cleaner body with a clean cloth or tape to prevent dirt or dust from entering.
Page 236 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 6. Direct dry compressed air (less than 0.69 MPa (7 kg/cm , 99.4 PSI)) to the outer element from inside along its folds, then direct it from outside along its folds and again from inside. 1) Remove one seal from the element whenever the element has been cleaned.
Page 237 MAINTENANCE MAINTENANCE PROCEDURE Install Air Cleaner Element NOTICE Do not use any damaged gasket or seal or element with damaged pleats. Cleaning the element or O-ring after one year has passed and using them again will cause problems. Always replace them with new parts.
Page 238 MAINTENANCE MAINTENANCE PROCEDURE Replacing Inner Element 1. First remove the outer element, and then remove the inner element. 2. Cover the air connector side (outlet side) with a clean cloth or tape. 3. Clean the air cleaner body interior, then remove the cover from the air intake port in Step 2. 4.
Page 239 MAINTENANCE MAINTENANCE PROCEDURE CLEAN INSIDE OF COOLING SYSTEM WARNING Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under high internal pressure. If the cap is removed to drain the coolant in this condition, there is a hazard of burns. Wait for the temperature to go down, then turn the cap slowly to release the pressure before removing it.
Page 240 Use city water for the coolant. If river water, well water or other such water supply must be used, contact your Komatsu distributor. We recommend use of an antifreeze density gauge to control the mixing proportions.
Page 241 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 4. Set a container under drain valves (6) and (7) to catch the coolant, then open drain valves (6) and (7) and drain the coolant. When draining the coolant, install the drain hose (kept in the toolbox) to drain valves (6) and (7) and be careful not to let the coolant splash.
Page 242 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 13. Open the cover at the left side at rear of the machine, drain the coolant from sub tank (8), wash inside of the sub tank, remove cap (9), then fill with coolant to between the FULL and LOW marks.
Page 243 MAINTENANCE MAINTENANCE PROCEDURE CHECK AND TIGHTEN TRACK SHOE BOLTS If the machine is used with track shoe bolts (1) loose, they will break, so tighten any loose bolts immediately. Tightening 1. First, tighten to a tightening torque of 784 ± 78 Nm (80 ± 8 kgm, 578.6 ± 57.9 lbft), then check that the nut and shoe are in tight contact with the link mating surface.
Page 244 MAINTENANCE MAINTENANCE PROCEDURE CHECK AND ADJUST TRACK TENSION WARNING For details of starting the engine and operating the work equipment, see "BEFORE STARTING ENGINE (PAGE 3-75)", "STARTING ENGINE (PAGE 3-94)", "AFTER STARTING ENGINE (PAGE 3-99)", and "WORK EQUIPMENT CONTROLS AND OPERATIONS (PAGE 3-115)"...
Page 245 There is danger of plug (1) flying out under the high internal pressure of the grease. Never loosen plug (1) more than 1 turn. Never loosen any part other than plug (1). Never put your face in the mounting direction of plug (1). If the track tension cannot be loosened with the procedure given here, please contact your Komatsu distributor. Increasing Track Tension Prepare a grease pump.
Page 246 MAINTENANCE PROCEDURE CHECK ELECTRICAL INTAKE AIR HEATER Before the start of the cold season (once a year), contact your Komatsu distributor to have the electrical intake air heater repaired or checked for dirt or disconnections. Remove the electrical intake air heater from the engine intake manifold, and check it for possible disconnections and dirt.
Page 247 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 3. Clean the mounting face. Fit a new tooth (2) in the adapter, push in pin (1) partially by hand, then lock it with a hammer to install the tooth to the bucket. ADJUST BUCKET CLEARANCE WARNING It is dangerous if the work equipment is mistakenly moved when adjusting the bucket clearance.
Page 248 MAINTENANCE MAINTENANCE PROCEDURE REPLACEMENT OF FAN BELT AND ADJUSTMENT OF AUTO TENSIONER An auto-tensioner is installed, so there is no need for any adjustment until the belt is replaced. Replacement 1. After loosening locknut (1), loosen adjustment screw (2) and pull back to bracket (3).
Page 249 MAINTENANCE MAINTENANCE PROCEDURE Adjustment 1. Tighten adjustment screw (2), bring the tip of the adjustment screw into contact with tension pulley lever (5), then tighten the adjustment screw a further 2 turns and hold it in position with locknut (1). 2.
Page 250 (C) Colorless, transparent: No refrigerant REMARK When there are bubbles, the refrigerant gas level is low, so contact your Komatsu distributors to have refrigerant added. If the air conditioner is run with the refrigerant gas level low, it will cause damage to the compressor.
Page 251 MAINTENANCE MAINTENANCE PROCEDURE Inspection During Off Season Even during the off-season, operate the air conditioner for 3 to 5 minutes once a month to maintain the oil film at all parts of the compressor. Inspection and Maintenance Items Guideline for maintenance Check, maintenance items Content of check, maintenance interval...
Page 252 MAINTENANCE MAINTENANCE PROCEDURE BLEEDING AIR FROM HYDRAULIC SYSTEM For details, see "STARTING ENGINE (PAGE 3-94)". If it is necessary to refer to the items for starting the engine, moving the machine off, steering, or stopping, see the OPERATION section. NOTICE Bleed the air as follows.
Page 253 NOTICE If the air is not bled from the swing motor, the motor bearings may be damaged. When replacing the travel motor safety valve, please contact your Komatsu distributor to have it replaced and to have the air bled. 5. Bleeding air from attachment (when installed) If an attachment has been installed, run the engine at low idling and operate the attachment pedal repeatedly (approx.
Page 254 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 6. Bleeding air from travel motor circuit If the piping has been removed from the travel motor circuit, bleed the air after reassembling. To bleed the air, run the engine at low idling and do as follows. 1) Start the engine and run at low idling.
Page 255 MAINTENANCE MAINTENANCE PROCEDURE METHOD FOR RELEASING INTERNAL PRESSURE IN HYDRAULIC CIRCUIT RELEASING PRESSURE FROM WORK EQUIPMENT CIRCUIT, SWING CIRCUIT, TRAVEL CIRCUIT WARNING The hydraulic system is always under internal pressure, so when inspecting or replacing the piping or hoses, always release the pressure in the circuit before starting.
Page 256 3. Check that the tip of the bucket drops at least 1 m (3 ft). If the tip of the bucket drops less than 1 m (3 ft), the charge pressure inside the accumulator is low, so contact your Komatsu distributor. 4 - 41...
Page 257: Check Before Starting
MAINTENANCE MAINTENANCE PROCEDURE CHECK BEFORE STARTING For details of the following items, see "Checks Before Starting (PAGE 3-77)" in the OPERATION section. Check coolant level, add coolant Check oil level in engine oil pan, add oil Check fuel level, add fuel Check for water and sediment in water separator, drain water Drain water and sediment from fuel tank Check oil level in hydraulic tank, add oil...
Page 258: Every 10 Hours Maintenance
MAINTENANCE MAINTENANCE PROCEDURE EVERY 10 HOURS MAINTENANCE LUBRICATING 1. Set to the greasing posture below, lower the work equipment to the ground, then stop the engine. 2. Using a grease pump, pump in grease through the grease fittings shown by arrows. 3.
Page 259 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE (2) Boom foot pin (2 places) (3) Boom cylinder rod end pin (2 places) (4) Arm cylinder foot pin (1 place) (5) Boom - Arm coupling pin (1 place) (6) Bucket cylinder foot pin (1 place) (7) Arm cylinder rod pin (1 place) (8) Arm - Link coupling pin (1 place) (9) Arm-Bucket coupling pin (1 place)
Page 260 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE (10) Link coupling pin (2 places) (11) Bucket cylinder rod pin (1 place) (12) Bucket-Link coupling pin (1 place) 4 - 45...
Page 261: Every 100 Hours Maintenance
MAINTENANCE MAINTENANCE PROCEDURE EVERY 100 HOURS MAINTENANCE Maintenance for every 10 hours service should be carried out at the same time. LUBRICATING SWING CIRCLE (4 points) 1. Lower the work equipment to the ground. 2. Using a grease pump, pump in grease through the grease fittings shown by arrows.
Page 262: Every 250 Hours Maintenance
MAINTENANCE MAINTENANCE PROCEDURE EVERY 250 HOURS MAINTENANCE Maintenance for every 10 hours service should be carried out at the same time. CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL WARNING The parts and oil are at high temperature immediately after the engine is stopped, and may cause serious burns. Wait for the temperature to go down before starting the operation.
Page 263 MAINTENANCE MAINTENANCE PROCEDURE CHECK LEVEL OF BATTERY ELECTROLYTE Carry out this procedure before operating the machine. WARNING Do not use the battery if the battery electrolyte level is below the LOWER LEVEL line. This will accelerate deterioration of the inside of the battery and reduce the service life of the battery. In addition, it may cause an explosion. The battery generates flammable gas and there is danger of explosion, do not bring fire or sparks near the battery.
Page 264 If distilled water is added to above the U.L. line, use a syringe to lower the level to the U.L. line. Neutralize the removed fluid with baking soda (sodium bicarbonate), then flush it away with a large amount of water or consult your Komatsu distributor or battery maker. 4 - 49...
Page 265 If water is added to above the bottom tip of the sleeve, use a pipette to remove electrolyte. Neutralize the removed electrolyte with sodium bicarbonate, then flush it away with a large amount of water. If necessary, contact your Komatsu distributor or your battery maker. When it is Possible to Use Indicator to Check Electrolyte Level If it is possible to use an indicator to check the electrolyte level, follow the instructions given.
Page 266 MAINTENANCE MAINTENANCE PROCEDURE CHECK, CLEAN FUEL TANK STRAINER Tighten the valve of the fuel tank, remove cap (1) of the strainer case under the oil pan, then take out the strainer and wash the strainer and strainer case. After doing this, replace the strainer O-ring. CHECK AND TIGHTEN TRACK FRAME AND AXLE CONNECTING BOLTS Bolts (1) connecting the track frame and axle will break if they remain loose, so loose bolts must always be retightened.
Page 267 MAINTENANCE MAINTENANCE PROCEDURE CHECK ALTERNATOR DRIVE BELT TENSION, ADJUST Checking The standard deflection for the drive belt is (A) when pressed with a thumb (at approx. 58.8 N {approx. 6 kg}) at a point midway between drive pulley (2) and alternator pulley (1). (A): 10 - 15 mm (0.4 - 0.6 in) Adjustment 1.
Page 268 MAINTENANCE MAINTENANCE PROCEDURE CHECK AIR CONDITIONER COMPRESSOR BELT TENSION, ADJUST Checking 1. Remove bolts (2) and (3), then remove cover (1). 2. The standard deflection for the drive belt is (A) when pressed with a thumb [at approx. 58.8 N (approx. 6 kg] at a point midway between drive pulley (4) and air conditioner compressor pulley (5).
Page 269: Every 500 Hours Maintenance
The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection pump and nozzle. If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection system. Always avoid using substitute parts.
Page 270 Tightening torque: 4.9 to 6.9 Nm (0.5 to 0.7 kgm , 3.6 to 5.1 lbft) 10. Push the knob of priming pump (3) in and tighten it. Use a genuine Komatsu part for the fuel filter cartridge. After replacing the filter cartridge, run the engine, and check for any fuel leakage from the filter seal surface.
Page 271 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE If the grease is particularly milky due to ingress of water, etc., then remove bolts (4) and cover (5) from the bottom of the track frame and remove the grease. Replace all of the grease with new grease.
Page 272 MAINTENANCE MAINTENANCE PROCEDURE CLEAN AND INSPECT RADIATOR FINS, OIL COOLER FINS, AFTERCOOLER FINS, FUEL COOLER FINS, AND AIR CONDITIONER CONDENSER FINS (only machines equipped with air conditioner) WARNING If compressed air, high-pressure water, or steam hits your body directly or dirt is sent flying by the compressed air, high-pressure water, or steam, there is danger of personal injury.
Page 273 MAINTENANCE MAINTENANCE PROCEDURE CLEAN FRESH/RECIRC AIR FILTERS OF AIR CONDITIONER (ONLY FOR MACHINES EQUIPPED WITH AIR CONDITIONER) WARNING If compressed air scattered around dust and debris, there is danger of injury. Always wear protective equipment such as protective glasses and mask. NOTICE As a guideline, the filters should be cleaned every 500 hours, but on dusty jobsites, clean the filters more frequently.
Page 274 MAINTENANCE MAINTENANCE PROCEDURE 3. Clean the filter with compressed air. If there is oil on the filter, or if the filter is extremely dirty, wash it in a neutral agent. After rinsing it in water, dry it thoroughly before using it again. If the clogging of the filter cannot be removed by blowing with air or washing in water, replace the filter with a new part.
Page 275 MAINTENANCE MAINTENANCE PROCEDURE REPLACE PILOT FILTER ELEMENT WARNING The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait for the temperature to go down before cleaning the engine breather. When using compressed air, there is a hazard that dirt may be blown up and cause serious injury. Always use safety glasses, dust mask, or other protective equipment.
Page 276 MAINTENANCE MAINTENANCE PROCEDURE CLEAN STRAINER OF PTO LUBRICATING OIL FILTER WARNING The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait for the temperature to go down before cleaning the engine breather. When using compressed air, there is a hazard that dirt may be blown up and cause serious injury.
Page 277 MAINTENANCE MAINTENANCE PROCEDURE REPLACE DRAIN FILTER CARTRIDGE 1. Using a filter wrench, turn the filter cartridge (1) to the left to remove it. 2. Fill the new filter cartridge with hydraulic oil, coat the packing surface with oil, then install it. When installing it, bring the packing surface into contact with the seal surface of the filter holder, then tighten a further 1/2 - 3/4 turns.
Page 278 MAINTENANCE MAINTENANCE PROCEDURE CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE For machines equipped with a bypass filter (if equipped), carry out this maintenance every 250 hours. WARNING Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil temperature to go down before performing this operation.
Page 279 MAINTENANCE MAINTENANCE PROCEDURE 4. Clean the filter holder, fill the new filter cartridge with clean oil, coat the thread and packing surface of the new filter cartridge with clean oil (or coat it thinly with grease), then install it to the filter holder. REMARK Check that there is no old packing stuck to the filter holder.
Page 280 The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection pump and nozzle. If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection system. Always avoid using substitute parts.
Page 281 MAINTENANCE MAINTENANCE PROCEDURE 6. When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it 3/4 of a turn. If the filter cartridge is tightened too far, the packing will be damaged and this will lead to leakage of fuel. If the filter cartridge is too loose, fuel will also leak from the packing, so always tighten the correct amount.
Page 282: Every 1000 Hours Maintenance
The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection pump and nozzle. If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection system. Always avoid using substitute parts.
Page 283 Tightening torque: 4.9 to 6.9 Nm (0.5 to 0.7 kgm , 3.6 to 5.1 lbft) 10. Push the knob of priming pump (3) in and tighten it. Use a genuine Komatsu part for the fuel filter cartridge. After replacing the filter cartridge, run the engine, and check for any fuel leakage from the filter seal surface.
Page 284 MAINTENANCE MAINTENANCE PROCEDURE REPLACE BREATHER ELEMENT IN HYDRAULIC TANK WARNING The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the temperature to go down before starting the work. When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it. 1.
Page 285 4. After removing spring (2), valve (3) and strainer (5), take out element (4). If there are metal particles or foreign material inside strainer (5), contact your Komatsu distributor. 5. Clean the removed parts in flushing oil. 6. Install the new element in the place where old element (4) was installed.
Page 286 MAINTENANCE MAINTENANCE PROCEDURE CHANGE OIL IN SWING MACHINERY CASE WARNING Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil temperature to go down before performing this operation. Refill capacity: 24.5 liters (6.47 US gal) 1.
Page 287 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 3. Remove dipstick (G), then add the specified amount of oil through filler port (F) of the dipstick guide. 4. Wipe off the oil on the dipstick with a cloth. 5. Fully insert dipstick (G) into filler pipe, then remove it. 6.
Page 288 If excess oil is supplied, drain it to the specified amount to avoid overheating. CHECK ALL TIGHTENING PARTS OF TURBOCHARGER Please contact your Komatsu distributor to have the tightening portions checked. CHECK PLAY TURBOCHARGER ROTOR Contact your Komatsu distributor to have the rotor play checked.
Page 289 4. Clean the filter holder, coat the seal surface of the new cartridge thinly with oil, then install the cartridge. Always use a genuine Komatsu part for the cartridge. 5. When installing the cartridge, bring the packing surface into contact with the seal surface of the filter holder, then tighten a further 2/3 times.
Page 290 MAINTENANCE MAINTENANCE PROCEDURE CHECK WELDED STRUCTURE (Color check) Cracks in welded structures can be seen easily with a color check. Check the revolving frame, center frame, boom, and arm every 1000 hours. In particular, carry out a color check on the important check points (marked with a circle). The procedure for the color check is as follows.
Page 291 MAINTENANCE MAINTENANCE PROCEDURE (A): Important check points (F): Front Revolving frame Center frame 4 - 76...
Page 292 (A): Important check points Boom CHECK NITROGEN GAS CHARGE PRESSURE IN ACCUMULATOR (for breaker) (If equipped) A special tool is needed for inspecting and charging with nitrogen gas. Have your Komatsu distributor inspect and charge the accumulator. 4 - 77...
Page 293: Every 2000 Hours Maintenance
CHECK INJECTOR Check the color of the exhaust gas visually. If there is any abnormality in the exhaust gas color, contact your Komatsu distributor for inspection. For details, see "TROUBLES AND ACTIONS (PAGE 3-150)" "Exhaust color is black". 4 - 78...
Page 294 MAINTENANCE MAINTENANCE PROCEDURE CLEAN HYDRAULIC TANK STRAINER WARNING After the engine is stopped, the parts and oil are at high temperature, so there is danger of burns. Wait for the temperature to go down before starting the operation. When the cap of the oil filler port is removed, oil may spurt out, so turn it slowly to release the internal pressure, then remove it carefully.
Page 295 Contact your Komatsu distributor for cleaning or inspection. CHECK ALTERNATOR, STARTING MOTOR The brushes may be worn,or the bearing may have run out of grease, so contact your Komatsu distributor for inspection or repair. When the engine is frequently started, ask for inspection every 1000 hours or every 6 months, whichever comes sooner.
Page 296: Every 4000 Hours Maintenance
Komatsu distributor for disassembly and repair or replacement. CHECK VIBRATION DAMPER There may be leakage from the damper, dents, or face runout, so contact your Komatsu distributor for replacement. CHECK FAN PULLEY AND TENSION PULLEY Inspect the pulley for play and grease leakage.
Page 297 Always check that the proper high-pressure piping clamps are correctly installed. REPLACE INJECTOR NOZZLE ASSEMBLY Contact your Komatsu distributor to have the injector nozzle assembly replaced. 4 - 82...
Page 298 If there is any problem, the problem part must be replaced. Contact your Komatsu distributor for part replacement. 4 - 83...
Page 299: Every 5000 Hours Maintenance
MAINTENANCE MAINTENANCE PROCEDURE EVERY 5000 HOURS MAINTENANCE Maintenance for every 10, 100, 250, 500, 1000, and 2000 hours of service should be performed at the same time. CHANGE OIL IN HYDRAULIC TANK WARNING The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the temperature to go down before starting the work.
Page 300 MAINTENANCE MAINTENANCE MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE 5. Set the container to catch the oil under the drain plug at the bottom of the chassis. Remove drain plug (P1), then loosen plug (P2) and drain the oil. After draining the oil, tighten drain plugs (P1) and (P2).
Page 301 MAINTENANCE MAINTENANCE PROCEDURE CHECK AND TIGHTEN SWING CIRCLE BOLTS If the machine is operated with loose swing circle bolts (A) and (B), they will be broken. Retighten the bolts whenever they are found loose. Tightening 1. Tightening procedure of swing circle bolt (A) 1) Open the grease pump box at the right side of the machine, then remove spare grease can holder cover (1) and spare grease can.
Page 302: Every 8000 Hours Maintenance
Maintenance for every 10, 100, 250, 500, 1000, 2000, and 4000 hours of service should be performed at the same time. REPLACE HIGH-PRESSURE PIPING CLAMP Contact your Komatsu distributor to have the engine high-pressure clamps replaced. REPLACE FUEL SPRAY PREVENTION CAP Contact your Komatsu distributor to have the fuel spray prevention cap replaced. 4 - 87...
Page 304 5 - 1...
Page 305: Specifications
(159,863) (161,627) (172,211) (168,021) (166,919) Bucket capacity (cu.yd) 3.1 (4.1) 4.0 (5.2) 3.1 (4.1) 3.4 (4.4) 4.3 (5.6) Name of engine Komatsu SAA6D140E-3 diesel engine Flywheel horsepower HP/rpm 454/1,800 454/1,800 454/1,800 454/1,800 454/1,800 14,305 13,030 14,305 13,895 13,030 A Overall length (ft in) (46'11")
Page 306 SPECIFICATIONS SPECIFICATIONS SPECIFICATIONS SPECIFICATIONS Working range Unit PC750-7 PC750SE-7 PC750LC-7 PC800-7 PC800SE-7 13,740 12,265 13,740 13,660 12,265 A Maximum digging radius (ft in) (45'1") (40'3") (45'1") (44'10") (40'3") 8,600 7,130 8,600 8,445 7,130 B Maximum digging depth (ft in) (28'3") (23'5")
Page 308 6 - 1...
Page 309: Attachments And Options
There may also be problems of the attachment or option hitting the operator's cab. Install only attachments or options authorized by Komatsu. Komatsu cannot accept any responsibility for any accident, damage, or failure caused by the use of attachments or options not authorized by Komatsu. READ THE INSTRUCTION MANUAL THOROUGHLY Before installing or using any attachment or option, make sure that you thoroughly read and understand the instruction manuals for the machine and the attachment or option.
Page 310: Attachment Guide
WARNING Please read the instruction manual for the attachment and the sections of this manual related to attachments and options. When installing any attachment or option, there may be problems with safety, so please contact your Komatsu distributor before installing.
Page 311 ATTACHMENTS AND OPTIONS ATTACHMENT GUIDE Select the combination of boom, arm, and bucket from the combinations shown in the table below. PC750-7 Model PC750SE-7 PC800-7 PC800SE-7 PC750LC-7 Strengthened Standard boom SE boom SE boom Boom boom Bucket width [mm (in)] 8.2m...
Page 312 ATTACHMENTS AND OPTIONS ATTACHMENT GUIDE Working Range Diagram PC750-7 PC750-7 PC750SE-7 PC800-7 PC800SE-7 PC800SE-7 PC750LC-7 PC750LC-7 Working range Unit SE arm Strengthened SE arm SE arm Standard Long arm 2.9m arm 3.6m 2.9m 3.6m arm 3.6m 5.6m Maximum digging 13,740...
Page 314 7 - 1...
Page 315: Loading Shovel
LOADING SHOVEL EXPLANATION OF COMPONENTS EXPLANATION OF COMPONENTS SWITCHES Starting switch Room lamp switch Fuel control dial (10) Pump drive emergency switch Cigarette lighter (11) Swing holding brake release switch Swing lock switch (12) Rotating lamp switch (if equipped) Lamp switch (13) Shackles boom control switch Alarm buzzer stop switch...
Page 316 LOADING SHOVEL EXPLANATION OF COMPONENTS Starting Switch Fuel Control Dial (with Auto-deceleration System) Cigarette Lighter Swing Lock Switch Lamp Switch Alarm Buzzer Stop Switch Machine Push-up Switch Horn Switch When the switch (8) at the tip of the right work equipment control lever is pressed, the horn will sound.
Page 317 LOADING SHOVEL EXPLANATION OF COMPONENTS Lower Wiper Switch Step Light Switch Bottom Dump Switch Use this switch (16) to open and close the front bucket. If the button at the tip of the left work equipment control lever is depressed, the bucket will close. If the button at the tip of the right work equipment control lever is depressed, the front bucket will open.
Page 318: Fuse
LOADING SHOVEL EXPLANATION OF COMPONENTS FUSE NOTICE Before replacing a fuse, be sure to turn off the starting switch. The fuses protect the electrical equipment and wiring from burning out. If the fuse becomes corroded, or white powder can be seen, or the fuse is loose in the fuse holder, replace the fuse.
Page 319: Operations
LOADING SHOVEL OPERATIONS OPERATIONS OPERATION OF WORK EQUIPMENT WARNING If the lever is operated in the deceleration range, the engine speed will suddenly rise. Operate the levers carefully. If the work equipment control levers are operated quickly, the engine speed will suddenly rise. Operate the levers carefully. The work equipment is operated with the left work equipment control lever and right work equipment control lever.
Page 320 LOADING SHOVEL LOADING SHOVEL OPERATIONS OPERATIONS Boom operation (A): Boom RIASE (B): Boom LOWER Bucket operation (A): Bucket DUMP (B): Bucket CURL Bottom dump operation (A): OPEN (B): CLOSE 7 - 7...
Page 321: Precautions During Operation
LOADING SHOVEL OPERATIONS PRECAUTIONS DURING OPERATION WARNING When the arm is pushed out to the front, the speed momentarily becomes slow around the vertical position of the arm. (A): Platform It is Prohibited to Use the Swing Force for Operations. Do not use bucket swing force to compact soil or break an earth wall, or do not dig the bucket teeth into the ground while swinging the bucket.
Page 322 LOADING SHOVEL OPERATIONS Do not Carry Out Operations with the Hydraulic Cylinder at the End of its Stroke. If the cylinder is operated to the end of its stroke during operations, a large force will be brought to bear on the stopper inside the cylinder, and this will reduce the service life of the machine, so leave room (distance a) at the end of the stroke as far as possible.
Page 323 LOADING SHOVEL OPERATIONS It is Prohibited to Grip Rocks. Do not use the bottom dump bucket to grip rocks. It is Prohibited to Use the Bucket for Leaving Operations. Using the rear bucket to carry out leveling operations will bring an excessive force to bear on the work equipment, so do not use the rear bucket in this way.
Page 324 LOADING SHOVEL OPERATIONS Scraping-down Operations are Prohibited. Never use the front bucket of a bottom-dump bucket to scrap down rocks or soil. Digging Rocky Ground Do not attempt to directly excavate hard rocky ground with the work equipment. It is better to excavate it after breaking up by some other means.
Page 325: Excavator Work
LOADING SHOVEL OPERATIONS EXCAVATOR WORK In addition to the following, it is possible to further increase the range of applications by using various attachments. Shovel Work This is suitable for digging a place which is higher than the machine's position. It is most efficient if the arm s digging angle is from vertical to 60i forward, and the arm cylinder is used effectively.
Page 326: Precautions When Disassembling Machine
LOADING SHOVEL PRECAUTIONS WHEN DISASSEMBLING MACHINE PRECAUTIONS WHEN DISASSEMBLING MACHINE RELEASING PRESSURE When disassembling the machine or removing the piping during inspection or maintenance, always release the pressure as follows. Releasing Pressure from Work Equipment Circuit, Swing Circuit, Travel Circuit WARNING The hydraulic system is always under internal pressure, so when inspecting or replacing the piping or hoses, always release the pressure in the circuit before starting.
Page 327: Transportation
LOADING SHOVEL TRANSPORTATION TRANSPORTATION The machine can be disassembled into the machinery, operator's cab, platform, attachment, and counterweight, and transported in pieces. Please contact your Komatsu distributor when transporting the machine. MACHINE CONFIGURATION FOR TRANSPORT PC750-7 (LOADING SHOVEL) Undercarriage Item...
Page 328: Wear Parts
When replacing parts, always use Komatsu genuine parts. As a result of our continuous efforts to improve product quality, the part number may change, so inform your Komatsu distributor of the machine serial number and check for the latest part number when ordering parts. WEAR PARTS LIST The parts in parentheses are to be replaced at the same time.
Page 329: Maintenance
LOADING SHOVEL MAINTENANCE MAINTENANCE CHECK BEFORE STARTING Check Oil Level in Hydraulic Tank, Add Oil WARNING If the oil filler cap is removed without releasing the internal pressure, oil will spurt out, so turn the oil filler cap slowly to release the internal pressure, then remove it carefully.
Page 330 LOADING SHOVEL LOADING SHOVEL MAINTENANCE MAINTENANCE WARNING If oil is above the H level, stop the engine, wait for the hydraulic oil to cool down, then drain excess oil from drain plug (P1). When draining the oil, loosen bottom drain plug (P1), then loosen side drain plug (P2) and drain the oil.
Page 331: Every 10 Hours Maintenance
LOADING SHOVEL MAINTENANCE EVERY 10 HOURS MAINTENANCE LUBRICATTING 1. Set the work equipment in the greasing posture below, then lower the work equipment to the ground and stop the engine. 2. Using a grease pump, pump in grease through the grease fittings shown by arrows. 3.
Page 332: Every 5000 Hours Maintenance
LOADING SHOVEL MAINTENANCE EVERY 5000 HOURS MAINTENANCE Maintenance for every 10, 100, 250, 500, 1000, and 2000 hours of service should be performed at the same time. CHANGE OIL IN HYDRAULIC TANK, CLEAN STRAINER WARNING The parts and oil are at high temperature after the engine is stopped, and may cause burns. Wait for the temperature to go down before starting the work.
Page 333 LOADING SHOVEL LOADING SHOVEL MAINTENANCE MAINTENANCE 5. Remove the 10 mounting bolts of cover (2), take off the cover, then remove drain plug (3) at the bottom of the pump suction tube. 6. After draining the oil, tighten drain plug (3) and install cover (2). When loosening drain plug (P2) be careful not to get oil on yourself.
Page 334: Specification
Operating weight kg (lb) 76,000 (167,550) (including 1 operator) Bucket capacity (cu.yd) 4.5 (5.9) Name of engine Komatsu SAA6D140E-3 diesel engine Engine horsepower kW (HP)/rpm 338 (454)/1,800 A Overall length mm (ft in) 9,865 (32' 4") B Overall height mm (ft in) 5,640 (18' 6")
Page 335 LOADING SHOVEL COMBINATION OF WORK EQUIPMENT COMBINATION OF WORK EQUIPMENT WARNING Depending on the type or combination of work equipment, there is danger that the work equipment may hit the cab or machine body. When using unfamiliar work equipment for the first time, check before starting if there is any danger of interference, and operate with caution.
Page 336 LOADING SHOVEL COMBINATION OF WORK EQUIPMENT Working Range Diagram (PC750-7 LOADING SHOVEL) Working ranges Unit PC750-7LOADING SHOVEL A Max. digging radius mm (ft in) 10.305(33'10") B Max. digging reach at ground level mm (ft in) 9,920(32'7") C Max. digging height mm (ft in) 10,635 (34'11") D Max.
Page 338 INDEX INDEX <A> <F> ACCUMULATOR 3- 74 FOREWORD AFTER STARTING ENGINE 3- 99 FUSE 3- 68 AIR CONDITIONER CONTROLS 3- 48 FUSE ASHTRAY 3- 47 ATTACHMENT GUIDE <G> COMBINATIONS OF WORK GENERAL OPERATION INFORMATION 3-121 EQUIPMENT GENERAL PRECAUTIONS 2- 12 AUXILIARY ELECTRIC POWER 3- 67 GENERAL PRECAUTIONS FOR...
Page 339 INDEX MAGAZINE BOX 3- 46 PROHIBITED OPERATIONS 3-118 MAINTENANCE 7- 16 CHECK BEFORE STARTING 7- 16 <R> EVERY 10 HOURS MAINTENANCE 7- 18 RADIO 3- 62 EVERY 5000 HOURS RECOMMENDED APPLICATIONS 3-126 MAINTENANCE 7- 19 MAINTENANCE INFORMATION <S> MAINTENANCE PROCEDURE 4- 18 SAFETY CHECK BEFORE STARTING...
Page 340 INDEX TOWING THE MACHINE 3-152 <W> WEAR PARTS WEAR PARTS 7- 15 WEAR PARTS LIST WEAR PARTS LIST 7- 15 WINDSHIELD 3- 39 WORK EQUIPMENT CONTROLS AND OPERATIONS 3-115 WORKING MODE 3-117 <Y> YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR 8 - 3...

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