Table of Contents
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Operation &
Maintenance Manual
D31EX, PX-21
D37EX, PX-21
D39EX, PX-21
BULLDOZER
SERIAL NUMBER
D31EX-21
D31PX-21
D37EX-21
D37PX-21
D39EX-21
D39PX-21
WARNING
Unsafe use of this machine may cause serious injury or
death. Operators and maintenance personnel must read
this manual before operating or maintaining this
machine. This manual should be kept inside the cab for
reference and periodically reviewed by all personnel who
will come into contact with the machine.
- 50501 and up
- 50501 and up
- 5501 and up
- 5501 and up
-1501 and up
-1501 and up
EEAM023900
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Table of Contents
Troubleshooting
Related Manuals for Komatsu D37PX-21
Summarization of Contents
Operation and Maintenance Manual
Bulldozer Model Identification
Identifies the bulldozer models covered by this manual, including serial number information.
Safety Information
Signal Words and Hazard Levels
Explains DANGER, WARNING, CAUTION, NOTICE, and REMARK signal words for hazard communication.
Safety Labels
Pictorial Safety Label Explanations
Describes the meaning and placement of safety labels using pictograms.
Introduction to Machine Directions
Machine Directional References
Defines front, rear, left, and right relative to the operator's position.
Necessary Information for Service
Machine and Engine Identification Plates
Details on locating machine serial number and engine serial number plates.
Operation Overview
General View of Machine Components
Provides an overview and illustration of the machine's main components.
Explanation of Machine Components
Detailed explanations of various machine parts, controls, and gauges.
Operation Procedures
Starting Engine Procedures
Covers engine starting steps, pre-checks, and safety precautions.
General Machine Operation Guidelines
Describes basic machine operation and control usage.
Maintenance Sections
Transportation Procedures
Guidelines and safety measures for transporting the machine.
Troubleshooting Common Issues
Covers common problems, their causes, and remedies.
Maintenance Guide
General Maintenance Guidance
Provides general advice and best practices for performing maintenance.
Outline of Service Procedures
Overview of different service tasks and their importance.
Maintenance Information
Wear Parts List and Intervals
Lists parts subject to wear and their recommended replacement intervals.
Fluid Selection Guide by Temperature
Guidance for selecting fuel, coolant, and lubricants based on ambient temperature.
Safety Information
Safety Labels Overview
Explains the purpose, types, and importance of safety labels on the machine.
General Safety Precautions
General Safety Rules and Preparedness
Covers safety rules, abnormality reporting, PPE, and emergency preparedness.
Precautions for Operation Safety
Safety measures to ensure safe machine operation.
Safety Labels and Pictograms
Positions of Safety Pictograms
Illustrates the locations of safety pictograms on the machine for easy identification.
Specific Safety Label Cautions
Caution Before Operation and Handling
Details safety labels for operation, reverse movement, and leaving the operator's seat.
Specific Hazard Cautions
Cautions for Coolant, Accumulator, Track Tension, and Battery
Covers safety labels for high-temperature fluids, accumulators, track tension, and battery.
Machine Operation Safety Labels
Battery, Engine, and Approach Cautions
Safety labels concerning battery hazards, engine running, and approaching moving machinery.
ROPS and Jump Start Safety Labels
Cautions for ROPS and Jump Starting
Safety labels regarding Roll-Over Protective Structures (ROPS) and jump starting.
High-Temperature Parts Safety Label
Caution for High-Temperature Parts
Warns about the burn hazard from touching hot engine or exhaust components.
General Safety Precautions
Safety Rules and Emergency Preparedness
Covers safety rules, handling abnormalities, PPE, and fire/first aid kit requirements.
General Precautions for Safe Operation
Machine Cleanliness and Operator Compartment Safety
Importance of keeping the machine clean and safety inside the operator's compartment.
Operator Seat Lock Procedure
Crucial safety step: securing the safety lock lever before leaving the operator's seat.
General Precautions for Access
Handrails and Steps Safety Guidance
Guidance on using handrails and steps for safe entry and exit from the machine.
General Precautions for Hazards
Mounting, Dismounting, and Burn Hazards
Safe entry/exit, crushing, cutting, and burn hazards during operation.
General Precautions: Fire Prevention
Fire Prevention Measures
Details on preventing fires from fuel, oil, electrical issues, and accumulated debris.
General Precautions: Specific Hazards
ROPS, Attachment, and Modification Safety
Safety related to ROPS, attachments, and risks of unauthorized modifications.
Action if Fire Occurs
Procedure to follow in case of a fire involving the machine.
General Precautions: Worksite Safety
Worksite Safety and Electrical Hazards
Safety measures for worksites, including high-voltage electrical lines.
General Precautions: Operational Awareness
Visibility, Ventilation, and Signalman Safety
Ensuring visibility, proper ventilation, and communication with signalmen.
General Precautions: Asbestos Dust
Caution Regarding Asbestos Dust
Warning about potential asbestos dust hazards and protective measures.
Precautions for Operation
Starting Engine Procedures and Checks
Covers engine starting steps, pre-start checks, and safety during starting.
Precautions for Operation in Cold Areas
Cold Weather Starting Precautions
Specific precautions for starting and operating the machine in cold temperatures.
Operation Procedures
Pre-Operation Checks and Machine Movement
Covers pre-operation checks and safety measures when moving the machine.
Traveling Precautions
Safety guidelines to follow while traveling with the machine on various terrains.
Precautions for Operation
Slope Operation and Brake Usage Safety
Safety guidelines for operating on slopes and proper use of brakes.
Precautions for Operation
Snow Operation and Machine Parking Safety
Precautions for operating in snow and safe parking procedures.
Transportation Procedures
Loading, Unloading, and Shipping Guidelines
Steps and safety measures for loading, unloading, and shipping the machine.
Battery Precautions
Battery Hazard Prevention Measures
Covers battery hazards like gas, electrolyte, and explosion risks.
Towing Procedures
Towing Precautions and Methods
Safety guidelines and methods for towing the machine correctly.
Precautions for Maintenance Safety
Workplace Safety and Engine Stop Procedures
Covers workplace cleanliness, teamwork, and engine stop for maintenance.
Precautions for Maintenance
Two-Worker Maintenance Safety
Safety measures to follow when maintenance is performed by two workers.
Precautions for Maintenance
Tool, Accumulator, and Attachment Safety
Safety guidelines for using tools, handling accumulators, and attachments.
Precautions for Maintenance
Under Machine, Noise, and Hammer Safety
Safety measures for working under the machine, noise exposure, and hammer usage.
Precautions for Maintenance
Track Tension, Recoil Spring, and High-Pressure Oil Safety
Safety related to track tension adjustment, recoil springs, and high-pressure oil.
Precautions for Maintenance
Hose, Waste, and Compressed Air Safety
Safety measures for handling high-pressure hoses, waste disposal, and compressed air.
Periodic Safety Critical Parts Replacement
Importance and schedule for replacing safety-critical components.
Operation Procedures
Pre-Start Engine Checks and Adjustments
Daily checks and adjustments required before starting the engine.
Walk-Around Check Procedure
Daily inspection routine to ensure the machine is ready for operation.
General View of Machine
Machine Component Overview
Illustrates and labels the major components of the machine.
Explanation of Components
Front Panel Layout
Describes the layout and elements of the front control panel.
Emergency Caution Items
Engine Oil Pressure Caution Lamp
Explains the function and indication of the engine oil pressure warning lamp.
Emergency Caution Items
Coolant, HST Oil, Filter, and Pressure Warnings
Covers caution lamps for coolant temp, HST oil temp, filter clogging, and HST pressure.
Caution Items
Battery Charge Circuit Caution Lamp
Explains the caution lamp indicating an abnormality in the battery charging system.
Meter Group Explanation
Engine Coolant Temperature Gauge
Describes the engine coolant temperature gauge and its operating ranges.
Meter Group Explanation
HST Oil Temperature and Fuel Gauges
Explains the HST oil temperature and fuel level gauges.
Engine Preheating Pilot Lamp
Describes the indicator lamp for the engine preheating system.
Indicator Lamps
Warning and Filter/Oil Interval Lamps
Details the functions of the warning lamp and filter/oil replacement interval lamp.
Switches Overview
Lamp and Buzzer Switches
Explains the function of the lamp switch and buzzer cancel switch.
Switches Overview
Information and Reverse Speed Switches
Describes the information switch and reverse travel speed setting switch.
Control Levers and Pedals
Fuel Control Lever Operation
Details on controlling engine speed and output using the fuel control lever.
Blade Control Lever Functions
Blade Lifting and Tilting Control
Specific controls for raising, lowering, and tilting the bulldozer blade.
Angling Control and Safety Lock Lever
Angling Control Operation
How to angle the bulldozer blade using the control knob.
Safety Lock Lever Function
Importance and operation of the safety lock lever for equipment control.
Lockable Caps and Covers
Cap Opening and Closing Procedure
Instructions for opening and securely locking caps using the ignition key.
Car Stereo Handling
Car Stereo Component Explanation
Identifies and describes the various components of the car stereo system.
Car Stereo Functions
Radio Tuning and Presets
Instructions for tuning radio stations and setting preset channels.
Bass Control Operation
How to adjust the bass level of the audio system.
Air Conditioner Handling
Air Conditioner Switch Operations
Explains the function of the AC off and AC on/off switches.
Air Conditioner Handling
Airflow and Temperature Controls
Details on selecting airflow direction and adjusting cabin temperature.
Accumulator Handling and Safety
Accumulator Pressure Release Procedure
Steps to safely release internal pressure from the accumulator circuit.
Operation Procedures
Pre-Start Engine Checks and Adjustments
Daily checks and adjustments required before starting the engine.
Walk-Around Check Procedure
Daily inspection routine to ensure the machine is ready for operation.
Check Before Starting
Coolant Level Check and Addition
Procedure for checking and adding engine coolant.
Operator's Seat Adjustment
Seat Belt Fastening and Removal
Instructions for properly securing and using the seat belt.
Starting Engine
Normal Engine Starting Procedure
Step-by-step guide for starting the engine under normal conditions.
Post-Start Engine Operations
Machine Break-in and Warm-up Procedures
Guidelines for breaking in a new machine and warming up the engine.
Post-Start Engine Operations
Cold Weather Warm-up Procedures
Specific warm-up steps for operating the machine in cold weather.
Machine Operation
Moving the Machine Safely
Instructions and safety tips for moving the machine.
Steering Machine Operations
Normal Turning Operations
How to turn the machine during normal travel.
Steering Machine Operations
Pivot Turns and Slope Steering Techniques
Techniques for pivot turns and steering on slopes.
Precautions for Operation
Gauge Monitoring and Slope Travel Safety
Importance of monitoring gauges and safety measures for slope travel.
Brake Usage and Downhill Driving Safety
Proper use of brakes and safety guidelines for driving downhill.
Precautions on Slopes
Fuel Level, Engine Stops, and Cab Safety on Slopes
Precautions regarding fuel level, engine stops, and cab safety when on slopes.
Work Possible Using Bulldozer
Dozing and Smoothing Operations
Describes techniques for dozing and smoothing operations with the bulldozer.
Specialized Bulldozer Operations
Cutting Hard Ground, Felling Trees, and Side-Cutting
Techniques for cutting hard ground, felling trees, and performing side-cutting.
Check After Finishing Work
Pre-Start and Post-Start Checks After Work
Checks to perform before starting and after finishing work.
Tips for Longer Undercarriage Life
Undercarriage Operation and Inspection Methods
Operation techniques and inspection methods for undercarriage care.
Inspection and Repair Procedures
Measuring Track Link Pitch
Procedure for measuring the pitch length of track links.
Measuring Wear Components
Grouser Height and Track Roller Diameter Measurement
Methods for measuring grouser height and track roller diameter.
Transportation Procedures
Transportation Means and Equipment Removal
Methods for transporting the machine and removing work equipment.
Cab Removal Procedure
Steps for safely removing the machine's cab.
Cold Weather Operation
Low Temperature Precautions
Safety measures and operational adjustments for low temperatures.
Fuel, Lubricants, and Coolant Selection
Guide to selecting appropriate fluids for cold weather conditions.
Post-Work Procedures
After Work and Cold Weather Procedures
Steps after completing work and transitioning from cold weather conditions.
Long-Term Storage Guidelines
Storage Preparation and Procedures
Guidelines for preparing and storing the machine for extended periods.
Troubleshooting Section
Fuel Run-Out and Machine Towing
Troubleshooting for fuel run-out and procedures for machine towing.
Troubleshooting Section
Engine Start Troubleshooting
Steps to take when the engine fails to start.
When Engine Does Not Start
Brake Release Pump Connection
Procedure for connecting a brake release pump for towing a non-starting machine.
Battery Handling and Charging
Battery Removal, Installation, and Charging Precautions
Procedures for battery removal, installation, and safe charging practices.
Booster Cable Connection and Disconnection
Booster Cable Connection and Disconnection Steps
Step-by-step guide for connecting and disconnecting booster cables safely.
Other Troubleshooting Issues
Electrical System Troubleshooting
Common problems and remedies for the machine's electrical system.
Guide to Maintenance
General Maintenance Guidance
General advice and best practices for performing maintenance tasks.
Maintenance Procedures
Dusty Worksite and Oil Precautions
Safety for dusty sites, oil handling, engine cover, and hydraulic system.
Hydraulic System Bleeding and Hose Installation
Procedures for bleeding hydraulic systems and installing hydraulic hoses.
Outline of Service
Fluid and Oil Clinic Outline
Overview of oil, fuel, coolant services, and the oil analysis program.
Outline of Service
Coolant, Grease, and Oil Analysis Information
Details on coolant, grease, and Komatsu Oil Wear Analysis service.
Outline of Service
Oil Sampling and Storage Guidelines
Procedures for oil sampling and proper storage of oil and fuel.
Filter Importance and Replacement
Explains filter importance and procedures for their replacement.
Use of Fuel, Coolant, and Lubricants by Temperature
Proper Fluid Selection Guide
Table and guidance for selecting appropriate fluids based on ambient temperature.
Standard Tightening Torques
Torque List for Bolts and Hydraulic Hose
Specifies correct tightening torques for various bolts and hydraulic hose connections.
Periodic Replacement of Safety Critical Parts
Safety Critical Parts List and Intervals
Lists critical safety parts and their recommended replacement intervals.
Maintenance Schedule Chart
When Required Maintenance Tasks
Lists maintenance items to be performed as needed.
Check Before Starting Maintenance Tasks
Checks to perform before starting the engine each day.
50 and 250 Hour Service Intervals
Maintenance tasks required at 50 and 250-hour intervals.
Maintenance Schedule Chart
500 and 1000 Hour Service Intervals
Maintenance tasks required at 500 and 1000-hour intervals.
2000 and 4000 Hour Service Intervals
Maintenance tasks required at 2000 and 4000-hour intervals.
Service Procedures
Air Cleaner Element Service
Procedure for checking, cleaning, and replacing the air cleaner element.
Adjustment Procedures
Center Ball Play and Door Hinge Greasing
Adjusting center ball play and greasing door hinges.
Air Conditioner Check and Adjustment
Compressor Belt Tension and Refrigerant Level Check
Checking compressor belt tension and refrigerant level.
EVERY 50 HOURS SERVICE
Fuel Tank Water and Sediment Drain
Procedure for draining water and sediment from the fuel tank.
EVERY 250 HOURS SERVICE
Lubrication Points and Procedure
Details on lubrication points and the greasing process.
EVERY 500 HOURS SERVICE
Replace Fuel Filter Cartridge
Procedure for replacing the fuel filter cartridge.
EVERY 1000 HOURS SERVICE
Final Drive Case Oil Change
Procedure for changing the oil in the final drive case.
Fan Belt and Turbocharger Checks
Checking fan belt tension and turbocharger components.
EVERY 2000 HOURS SERVICE
Hydraulic Tank Oil, Filter, and Strainer Service
Procedure for changing hydraulic oil, replacing filter, and cleaning strainer.
Component Checks and Adjustments
Turbocharger, Damper, and Alternator Checks
Inspecting turbocharger, vibration damper, alternator, and starter motor.
Engine Valve Clearance Adjustment
Procedure for checking and adjusting engine valve clearance.
EVERY 4000 HOURS SERVICE
Water Pump Check Procedure
Procedure for checking the water pump for play, leaks, or clogging.
Attachments and Options
General Attachment Precautions
General safety guidelines for installing and using attachments.
General Precautions for Attachments
Attachment Safety Precautions
Specific safety measures to be followed when working with attachments.
Handling Hydraulic Ripper
General View of Hydraulic Ripper
Illustrates and labels the main components of the hydraulic ripper.
Ripper Component Explanation
Ripper Control Lever Operation
Describes how to operate the ripper control lever for raising, holding, and lowering.
Ripper Operation
Ripper Pre-Operation Checks and Adjustments
Checks before starting and adjusting ripper posture.
Ripper Point Replacement Procedure
Steps for replacing a worn ripper point.
Ripper Troubleshooting and Maintenance
Ripper Lubrication Schedule
Lubrication requirements for the ripper every 250 hours.
Deluxe Seat Features
Seat Adjustment Procedures
Instructions for adjusting the deluxe seat's position and settings.
Deluxe Seat Adjustments
Seat Height and Direction Adjustment
Details on adjusting seat height and swivel direction.
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