TYM T723 Service Manual

Table of Contents

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Chapter 1. Introduction

Chapter 2. Disassembly and reassembly of major point -----

Chapter 3. Engine accessories -----------------------------------

Chapter 4. Clutch system ------------------------------------------

Chapter 5. Transmission

Chapter 6. Front axle (4WD)

Chapter 7. Rear axle and Brakes ---------------------------------

Chapter 8. Power steering system--------------------------------

Chapter 9. Hydraulic system --------------------------------------

Chapter 10. Electric accessories and instruments -----------

Chapter 11. Service standard and other information --------

Chapter 12. Cabin ---------------------------------------------------

Chapter 13. Conversion table--------------------------------------

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TRACTORS

T723

SERVICE MANUAL

Table of Contents

Chapters

Table of Contents

Troubleshooting

Need help?

Do you have a question about the T723 and is the answer not in the manual?

Questions and answers

Janna Hampton

April 27, 2025

I need a shuttle shift switch for T723 tractor

1 comments:

Mr. Anderson

May 14, 2025

The context does not specify where to find a shuttle shift switch for the TYM T723 tractor. However, since it is identified as having a shuttle shift system and the shifter is on the column, you would typically need to consult a wiring diagram or parts manual to locate the exact part number. Then, you can source the switch from a TYM dealer or a tractor parts supplier.

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Summary of Contents for TYM T723

Page 1 TRACTORS T723 SERVICE MANUAL Chapter 1. Introduction ------------------------------------ Chapter 2. Disassembly and reassembly of major point ----- Chapter 3. Engine accessories ----------------------------------- Chapter 4. Clutch system ------------------------------------------ Chapter 5. Transmission ------------------------------------ Chapter 6. Front axle (4WD) ---------------------------------- Chapter 7. Rear axle and Brakes --------------------------------- Chapter 8.
Page 2 Chapter 1 .Introduction This tractor service manual is for qualified service personnel engaged in servicing and overhauling T723 tractor.Use of this publication is not recommended for field operators since they usually do not have access to special tools and shop equipment essential for most servicing.
Page 3 SAFETY INSTRUCTION ALWAYS PRACTICE SAFETY BY THINKING BEFORE ACTION AVOID FIRE HAZARDS. -Keep fire extinguishers easily available and in good operating condition. All relevant personnel should know how to operate fire fighting equipment. -Keep a first aid kit in an easily accessible location. -Do not smoke while handling fuel,or other highly flammable material.
Page 4 STAY CLEAR OF PTO 1) Entanglement in rotating drive line can cause serious injury or death. 2) Keep tractor master shield and drive line shield in place at all times except for special applications as directed in the implement operator's manual. 3) Wear fairly tight tight fitting clothing.Stop the engine and be sure PTO driveline is stopped before making adjustment,connections,or cleaning out PTO drive equipment.
Page 5 WARNING SIGNS IN THIS MANUAL The following warning symbols in this manual draw additional attention to items of importance for the safe and correct operation of the tractor. SIGN MEANING OF SIGN Serious hazard with a very high level of risk of either serious injury or death DANGER Hazard or unsafe practice that can lead to severe...
Page 6 SAFETY SIGNS RECOGNIZE SAFETY INFORMATION This symbol, Safety-Alert Symbol, means ATTENTION! YOUR The message that follows the symbol SAFETY IS INVOLVED. contains important information about safety. Carefully read the message SIGNAL WORDS. A signal word―DANGER, WARNING OR CAUTION―is used DANGER with safety alert symbol.
Page 7 USE OF ROPS AND SEAT BELT The Roll over Protection Structure (ROPS) has been certified to industry and/or government standards. Any damage or alternation to the ROPS, mounting hardware, or seat belt voids the certification and will reduce or eliminate protection for the operator in the event of a roll-over.
Page 8 HANDLE FUEL SAFELY-AVOID FIRES Handle fuel with care; it is highly flammable. Do not refuel the Tractor while smoking or near open flame or sparks. Always stop engine before refueling Tractors. Always keep your tractor clean of accumulated grease, and debris. Always clean up spilled fuel.
Page 9 AVOID HIGH-PRESSURE FLUIDS Escaping fluid under pressure can penetrate the skin causing serious injury. Keep hands and body away from pinholes and nozzles, which eject fluids under high pressure. If ANY fluid is injected into the skin. Consult your doctor immediately. PREVENT BATTERY EXPLOSIONS Keep sparks, lighted matches, and open flame away from the top of the battery.
Page 10 WORK IN VENTILATED AREA Do not start the Tractor in an enclosed building unless the doors & windows are open for proper ventilation, as tractor fumes can cause sickness or death. If it is necessary to run an engine in an enclosed area remove the exhaust fumes by connecting an exhaust pipe extension which vents the fumes outside the enclosed area.
Page 11 SAFETY DECALS The following safety decals ARE INSTALLED ON THE MACHINE. If a decal become damaged, illegible or is on the machine, replace it. The decal part number is listed in the parts lists(Refer to Fig 903 in the parts catalogue) Location : On Dash cover side LH Part No.: 1260-904-062-0 1-10...
Page 12 1-11...
Page 13 1-12...
Page 14 1-13...
Page 15 UNIVERSAL SYMBOLS Some of the universal Symbols have been shown below with an indication of their meaning. Engine speed Pressured- Corrosive rev/minX100) open slowly substance Hours, Continuous ”Tortoise” recorded variable Slow or minimum Setting Engine ”Hare” fast or coolant Warning maximum temperature setting...
Page 16 SECTION 1. TRACTOR TYPES AND PUNCHED IDENTIFICATION MARKS The tractor serial number is shown on the left hand side of the tractor as shown in the picture. The engine number is stamped on the Injection pump. Tractor Serial Number Carved position of the Engine type or Number (On the LH E/G Cylinder Block) Carved position of the chassis number (On the LH of front axle bracket)
Page 17 2. Engine serial number plate on the RH of E/G Cylinder Block E . N O : 3 J 0 0 2 1 4 1-16...
Page 18 SECTION 2. SPECIFICATIONS MODEL T723 Engine Maker Perkins Model 1103C-33T Type Water cooled 4 cycle 3 cylinder diesel Out put ( HP / rpm ) 72 / 2200 (53 kw / 2200) Fuel delivery per stroke (mm 81 @ rated speed 2200 rpm...
Page 19 MODEL T723 Clutch Main Dry single disc, mechanic Multiple wet disk Dimensions Overall length, in. (mm) with 3P 149” (3,776) Overall width, in. (mm) 77.3” (1,964) Overall Height, in. (mm) 101.9” (2,588) Wheel base, in. (mm) 83.2” (2,114) (Distance between axles) Min.
Page 20 Traveling speeds : Km/h (Mile/h) Traveling Speed : Km/hour (mile/hour) / 2200 rpm MODEL T723 Creeper Range shift Main shift Forward Reverse 0.93 (0.58) 0.95 (0.59) 1.47 (0.91) 1.52 (0.94) 2.27 (1.41) 2.33 (1.45) 2.82 (1.75) 2.89 (1.80) 2.98 (1.85) 3.05 (1.90)
Page 21 SECTION 3. GEAR TRAIN DIAGRAMS Fig.1-3 GEAR TRAIN DIAGRAM 1-20...
Page 22 SECTION 4. PRECAUTION FOR TRACTOR OPERATION 1. INSTRUMENTS Left Turn Right Turn Indicator Lamp Indicator Lamp Indicator Lamp Tachometer Hour Meter Fuel Gauge Temp Gauge Hazard Warning Signal S/W Key S/W Turn Signal S/W PTO mode S/W Horn S/W Head Lamp S/W Note: Oil pressure warning light and charge light on the monitor array will light when the main switch is turned from OFF to ON.
Page 23 1) MONITOR LIGHT ARRAY 1. High Beam 2. Lower beam 3. Fuel level 4. PTO Light 5. Glow light 6. Alternator light 7. Parking light 8. Oil pressure light 9. 10. Turn signal light 2) MONITOR ARRAY (CABIN) 1-22...
Page 24 VENTILATION The ventilation unit is housed in the cab ceiling. To switch it on and adjust it, turn the electrical fan switch to the desired speed. The cab becomes slightly pressurized when the ventilation system is in operation, so that fresh air can enter only by way of the filter installed in the rear section of the cab roof.
Page 25 72ℓ (19 US gal) *1 : L.L.C = Long Life Coolant *2 : DEO : Diesel Engine Oil Tire size and inflation TABLE 1-8 Air pressure Kgf / ㎠ DIVISION SIZE T723 Tire Front 11.2 - 24 2.4 (34 PSI) Standard (Standard) Rear 16.9 - 30...
Page 26 4. MAINTENANCE CHART ○ inspection, replenish, and adjustment ● Replacement △ Cleaning and/or washing ★ Consult your Dealer ☞ ENGINE Inspection and servicing intervals Hour of operation Judgment Inspection (X10 on hour meter) Intervals after that criteria mm(in) items Every 500 hours or *To correct level on the dipstick ○...
Page 27 ○ inspection,replenish,and adjustment ● Replacement △ Cleaning and/or washing ★ Consult your Dealer ☞ TRANSMISSION Inspection and servicing intervals Hour of operation Judgment Inspection (X10 on hour meter) Intervals after that criteria items mm(in) Every 500 hours or Transmission ○ ●...
Page 28 Inspection and servicing intervals Hour of operation Judgment (X10 on hour meter) Inspection Intervals after that criteria mm(in) items Check every year All should work Electric properly apparatuses Adjusting Check after 300 accelerator hours ★ ★ pedal and throttle lever Check once a year Oil leaks in ○...
Page 29: Table Of Contents
Chapter 2 Disassembly and reassembly of major components SECTION 1. GENERAL PRECAUTIONS AND SEPARATION AND REINSTALLATION------------------------------------ 1. Before operation --------------------------------------------------------- 2. Precautions to be followed when installing standardized parts. -------------------------------------- SECTION 2. OPERATION CHART FOR DISASSEMBLY AND REASSEMBLY BY MAJOR BLOCKS------------- SECTION 3.
Page 30: And Reinstallation
(2) Oil seals 9) When replacing parts,use authorized, genuine 1) Oil seals installer should be designed so as TYM parts only.TYM assumes no not to deform the oil seals. responsibility for accidents,operating 2) During installation, be careful not to damage...
Page 31 (3) O-rings 3) The roll pins installed in the transmission or 1) O-rings should be coated with grease other parts where much force is applied before installing. should be retained with the wire. 2) Installed O-rings should have no slack or (6) Cotter pins twist.
Page 32 4) Each contact surface should be coated with an adhesive(THREE BOND TB 1215) and tightened evenly with bolts. Adhesive coated surfaces should be installed within 30 minutes after application of the adhesive. The contact surfaces should be flawless and free from foreign matter,and especially from grease before application of the adhesive.
Page 33: Section 2. Operation Chart For Disassembly
SECTION 2. OPERATION CHART FOR DISASSEMBLY AND REASSEMBLY BY MAJOR BLOCKS •Power steering •Knuckle spindle Axle Bracket Front Axle •Air cleaner •Final case •Radiator •Differential gear •Oil cooler •Engine front parts Engine •Muffler •Fly wheel •Main Clutch Front •Flow divider Transmission •Reverse Gear •Creep Gear...
Page 34: Section 3. Separation Of Major Components
SECTION 3. SEPARATION OF MAJOR COMPONENTS 1. SEPARATION OF THE FRONT AXLE ASSEMBLY AND THE AXLE BRACKET Parts which can be inspected during this operation -Final case -Differential gear -Power steering system (1) Removal 5) Remove the front axle assembly forward. Note : When working on the 4WD version, 1) Hold the front hitch or the front bracket the drive shaft should be removed...
Page 35: Separation Of The Engine And Front Axle Bracket
2. SEPARATION OF THE ENGINE AND THE FRONT AXLE BRACKET Parts which can be inspected during This operation -Air cleaner -Radiator -Engine front part. (1) Removal 9) Remove the upper hose, lower hose and drain hose from the radiator. 1) Hold or support the engine with a crane or stands.
Page 36: Separation Of The Engine And Front Transmission
(2) Installation 2) Support the engine on the bottom with a jack Reassemble in reverse order of removal. or stands. 3) Hold the transmission with a garage jack or a 1) Install the axle bracket on the engine. crane so that the transmission side can be 2) Retighten the nuts (6pcs) moved when needed.
Page 37 5) Disconnect the battery cables and fuel line. 10) Remove the hydraulic hose from the gear pump 11) Remove the muffler from the engine assembly 12) Separate the engine from the transmission Fuel line assembly after removing the bolts to the below Heater hose description.
Page 38 13) Refer to the description in the parts catalogue FIG. 609 FIG. 205 Fig. 2-22 Fuel line FIG. 610 FIG. 206 FIG. 611...
Page 39 FIG. 715 FIG. 502 Fig.2-25 Heater hose Fig.2-24 Front drive shaft (4WD) FIG. 701 FIG. 308 Fig.2-26 Engine hood Fig.2-27 Power steering 2-10...
Page 40 (2) Engine separation from the front axle bracket When separating the engine from the chassis, the following steps are required as well as the ones mentioned below. 1) Lift the engine with the hoist and hold the front axle bracket with a stands or the like. 2) Disconnect the upper, Lower, and drain hoses from the radiator.
Page 41: Separation Of The Front Transmission And Spacer Transmission
4. SEPARATION OF THE FRONT TRANSMISSION AND SPACER TRANSMISSION 4) Disconnect four power steering hoses Parts which can be inspected during this operation -Reverse change gears (Refer to the Fig 2-27 Power steering) -Creep change gears 5) Disconnect the brake rods under the floor. -Main change gears and related parts (1) Removal A : Removal of the cabin...
Page 42 9) Remove the main shift and transmission range 12) Remove the accelerator wire (Refer to shift levers. The levers can be separated in the Fig 206 in the Parts catalogue) middle. 13) Remove the quick coupler (Freezer hose) 10) Remove the control rods of the PTO shift and and heater hose.
Page 43 15) Remove four rubber mounts. 17) Remove the Cabin assembly. 2 x Bolts Rear LH, RH Fig. 2-44 2 x Bolts Front LH, RH Fig.2-42 Rubber mounting 16) Lift the cabin gradually taking care not to allow the shaft of the slow-return check valve and its hole in the floor to interfere with each other.
Page 44 B: Division of the chassis. 1) Drain the transmission case of oil Spacer transmission Brake rods Fig.2-48 View of the under chassis Front transmission 12) Remove the suction, delivery and drain pipes. 13) Remove the delivery pipe and the valve for the PTO clutch.
Page 45 16)Remove the bolts which tighten the front (2) installation transmission and spacer transmission cases. Reassemble in reverse order of disassembly. Upper : 2 x Nuts M14 1) Assemble the front and spacer transmission. LH, RH : 6 x Bolts M14 (Tightening torque : 1,300~1,500 kg-cm) Lower : 2 x Nuts M14 2) Install the reverse shift metal, the creep shift...
Page 46: Separation Of The Spacer Transmission And Rear Transmission
5. SEPARATION OF THE SPACER TRANSMISSION AND THE REAR TRANSMISSION Parts which can be inspected during This operation PTO clutch - Speed range gear(Sub shift gear) - Drive pinion gear - 4WD drive gear (1) Removal 4) Remove the bolts which tighten the spacer transmission and the rear transmission cases.
Page 47: Separation Of The Rear Transmission And Rear Axle Housing
(2) Installation 2) Lift up the rear transmission and remove the rear wheel on the diff-lock side. Reassemble in reverse order of disassembly. 3) Remove the tire assembly 4) Remove the brake rods. Note : The 4WD drive shaft should be installed on 5) Remove the 3-point linkage and related parts.
Page 48: Separation Of The Rear Transmission And Cylinder Case
7. SEPARATION OF THE REAR RANSMISSION AND CYLINDER CASE Parts which can be inspected during This operation -Control valve -Control linkage -Piston and lift crank linkage -PTO change gears. -differential gear Inspection and service of the rear transmission should be performed following the instructions in the paragraph : 4.
Page 49 Chapter 3 ENGINE ACCESSORIES SECTION 1. RADIATOR --------------------------------------------------- 1. General description ------------------------------------------------------ 2. Radiator -------------------------------------------------------------------------------------------- 3. Specifications ---------------------------- -------------------------------------------------------- 4. Removal of the radiator ------------------------------------------------------------------- 5. Inspection of each part -------------------------------------------------------------------- 6. Radiator reassembly ------------------------------------------------------ 7. Daily inspection ------------------------------------------------------------ 8. Trouble shooting ----------------------------------------------------------- SECTION 2.
Page 50 Chapter 3.Engine accessories SECTION 1. RADIATOR 1.General description The pressure cooling system includes mainly the radiator,water pump,multi-blade fan, and the thermostat.During the warm-up period,the thermostat remains closed and coolant is directed through by-pass to the suction side of the water pump.
Page 51: Section 1. Radiator
2. Radiator The radiator consists of radiator cores, a tank to Flow coolant,side plates to install the radiator, and a fan guide. Fin-tube type cores are used and the cores and tank is made of anti corrosive copper and Copper alloy. Fig.3-3 1.
Page 52: Radiator
3. SPECIFICATIONS Description T723 Radiator core type Flat water tube with corrugate wave fins Core train number 4 trains Radiator fin pitch ㎡ Thermal radiator area 13.14 ± 0.15Kgf/ ㎠ Pressure valve opening pressure ℓ Coolant capacity Test pressure 1.5 Kgf/㎠(21.3 psi) 4.
Page 53 -Clean with a detergent When cleaning the radiator with a detergent, follow the instructions given by its manufacturer. Different detergents have different characteristics. b. Cleaning the radiator exterior Cleaning the net (wire mesh) After the tractor has been operated in dusty Fig.3-5 conditions,check the net daily and clean it if necessary.
Page 54: Radiator Reassembly
6. RADIATOR REASSEMBLY 0.9 Kg / ㎠ Pressure valve Reassemble the radiator in the reverse order of Opening pressure (12.79 psi) disassembly. 0.04 ~ 0.05 Kg / ㎠ Vacuum valve Note: Opening pressure (0.57 ~ 0.71psi) - The rubber hoses should be clamped securely and must not interfere with the cooling fan.
Page 55: Trouble Shooting
8. TROUBLE SHOOTING TABLE 3-1 Problems Causes Countermeasures 1) Overheating (1) Low coolant level (1)Replenish coolant and inspect water leaks. (2) Fatigued pressure valve spring (2)Replace radiator cap. (3) Loose or broken fan belt (3)Adjust belt tension or replace. (4) Oily fan belt (4)Replace.
Page 56: Section 2. Air Cleaner System
SECTION 2. AIR CLEANING SYSTEM 1.GENERAL DESCRIPTION Unfiltered air contains many particles harmful to the engine such as dust ,sand,or other foreign matter. When such foreign matter have entered in to the engine,They have mixed into the lubricant and promote wear of lubrication parts in addition to damaging the piston cylinders.To eliminate these harmful particles, an air cleaner has been installed.The air cleaner Which is installed on the T series tractor is a dry ,cyclone type and is constructed as shown in the figure.
Page 57: Element Air-Cleaner
2.ELEMENT AIR CLEANER 1) SPECIFICATIONS. Model T723 Type Dry, paper element filtering type Rated intake air volume (㎥/min) air venting resistance (mmAq) 120 or less Cyclone efficiency (%) 45 or over Total filtering efficiency(%) 99.9 or Over Push holding capacity (gr) Filter area (㎡)(sq.in)
Page 58: Inspection Of Each Part
Note: 3. INSPECTION OF EACH PART Especially note the glue portions of the paper and 1) Inspection of the cleaner body metal parts. (1) Check the cleaner exterior for cracks, deformation,or damage and repair or replace 4. CLEANING THE AIR CLEANER if necessary.
Page 59: Element Installation
-After soaking,rise it in fresh water. -Let it in a shaded and well ventilated place. Forced drying by heat or compressed air is prohibited. Note: Water applied to rinse the element should not have a pressure of more than 2.8kgf/㎠ (39.8psi). An element which has been washed 5 times must be replaced with a new one.
Page 60 CHAPTER 4 Clutch system SECTION 1. GENERAL DESCRIPTION -------------------------------- SECTION 2. SPECIFICATIONS--------------------------------------------- SECTION 3. DISASSEMBLY,INSPECTION,AND REASSEMBLY- 1. Main clutch ------------------------------------------------------------------- 2. Clutch shaft and related parts -------------------------------------------- 3.Final adjustment of the clutch pedal ------------------------------------- SECTION 4. TROUBLESHOOTING ---------------------------------------...
Page 61: Section 1. General Description
Chapter 4. clutch system GENERAL DESCRIPTION. The clutch is a device to engage and disengage the power of the engine.The construction of the clutch is as shown in the figure. It is composed of the flywheel which holds the clutch disc, the pressure plate, diaphragm springs,the clutch cover,and input gear.
Page 62: Section 2. Specifications
SECTION 2. SPECIFICATIONS Table 4-1 Parts Items Description and assembly standard values Clutch cover Type Diaphragm Free length mm (in) 43.3 (1.70) Stroke mm (in) 8.0 (0.31) Springs Torque capacity (kgf.m) Tc=40.1 Clamping load (kgf) P=650 Clutch disc. Type Dry single plate Facing material F815 MCC Outer dia.
Page 63: Section 3. Disassembly,Inspection,And Reassembly
SECTION 3. DISASSEMBLY, INSPECTION, AND REASSEMBLY 1.Cover clutch 11.Clutch disc assy 21.Hub sleeve 22.Bolt(S) 23.O-ring(G75) 27.Sleeve 28.Bearing(Release) 29.Tension spring Fig. 4-3 Clutch assembly 1.2. INSPECTION (1) Inspection of the clutch disk 1.MAIN CLUTCH 1-1.Disassembly Check the clutch disk for wear or cracks on Separate the engine from the front transmission the facing,loose rivets,broken torsion springs, referring to the paragraph "SEPARATION OF...
Page 64 Note : Be sure to replace any clutch disc which has 0.2mm(0.008in) or less in rivet suppression. Use of a insufficient rivet depression disc will result in serious damage to the flywheel and the pressure plate. 2) Any oil stained clutch disc must be replace. However,a very small oil stain may simply be removed by use of a volatile solvent.
Page 65: Clutch Shaft And Related Parts
2.CLUTCH SHAFT AND RELATED PARTS. (1) disassembly 1) Remove the tension spring and extract the sleeve 2) Remove the wire which is retaining the taper pin. ①Clutch shaft comp ②Release fork ③Taper pin ④Wire ⑤Grease fitting Fig.4-8 Main clutch and related parts 3)Remove the grease fittings from the clutch Fig.4-7 shaft ends.
Page 66: Final Adjustment Of The Clutch Pedal
2)Inspection of sleeve 3.FINAL ADJUSTMENT OF THE CLUTCH PEDAL Ensure smooth movement of the sleeve.If it Clutch pedal play does not move smoothly,clean and grease it. 1) Loosen the lock nuts on the clutch rod and Use heat-proof grease. adjust the clutch rod length to achieve 30㎜ (1.18 in.) pedal play.Retighten the lock nut 3) Inspection of tension springs.
Page 67 Note 1 Note 1 Note 1 Note 1 ⓑ Fig 4-12 Main clutch Note 1 :Apply grease when Noisy on the Clutch Pedal Fig 4-11 Clutch adjustment 4) Loosen the lock nuts on the clutch rod and adjust the clutch rod length to achieve 30㎜ (1.18 in.) pedal play.
Page 68 SECTION 4. TROUBLESHOOTING 1.PROBLEM :Clutch slippage. The initial stage of clutch slippage is very hard to notice,but the following symptoms 1) The tractor is not generating adequate power when performing heavy duty operations. 2) Output is not commensurate to increate in engine speed when the engine is accelerated suddenly during operation.
Page 69 4. PROBLEM: Abnormal noises There are abnormal noises emanating from the clutch. Probable causes Countermeasures -Broken or insufficiently lubricated release bearing Replace -Seized or worn pilot bearing Replace -Cracked disc plate Replace 5. PROBLEM: Dashing or shifting The tractor does not starting moving smoothly but dashes or is likely to stop when the clutch is operated during a operation.
Page 70: Section 4. Troubleshooting
CHAPTER 5 Transmission SECTION 1.GENERAL DESCRIPTION----------------------------------- 1.Wheel driving system--------------------------------------------------------- 2.PTO drive system ------------------------------------------------------------- 3.Power train diagrams -------------------------------------------------------- 4.Speed shift patterns and gear train diagrams --------------------------- 5.Construction and function of synchromesh mechanism--------------- SECTION 2. SPECIFICATIONS--------------------------------------------- 1. Wheel drive system ----------------------------------------------------------- 2. PTO drive system ------------------------------------------------------------- SECTION 3.DISASSEMBLY,INSPECTION,AND REASSEMBLY-- 1.
Page 71: Section 1.General Description
Chapter 5 .Transmission SECTION 1. GENERAL DESCRIPTION 1. WHEEL DRIVE SYSTEM The wheel driving system is composed of the following major components: Front transmission Reverse change gears Creep change gears Transmission Main Change gears Space transmission Sub-change gears (speed range) Front drive change gears Ring gear Rear transmission...
Page 72: Speed Shift Patterns And Gear Train Diagrams
4. SPEED SHIFT PATTERNS AND GEAR TRAIN DIAGRAMS. 1) Reverse change gears Forward Fig.5-2 Reverse Fig.5-3 2) Main speed shift(Main change gears) Fig.5-4 Fig.5-5...
Page 73 Fig.5-6 Fig.5-7 3) Creep speed shift(Creep change gears) Creep ON / OFF Fig.5-8...
Page 74 4) Speed range shift (Sub-change gears) Fig.5-9 Fig.5-10 Fig.5-11...
Page 75 5) PTO speed shift(PTO change gear) Fig.5-12 Fig.5-13...
Page 76: Construction And Function Of Synchromesh Mechanism
5. CONSTRUCTION AND FUNCTION OF THE SYNCHROMESH MECHANISM 1) Construction ①Shifter ②Hub ③Block pin ④Synchro-ring ⑤Synchro-cup ⑥Thrust piece ⑦spring ⑧spline of hub(2) ⑨spline of synchro-cup(2) ⑩constant mesh gear ⑪spline of gear(10) ⑫constant mesh gear ⑬Spline of gear(12) ⑭Spline hub ⑮Spline of spline hub(14) 16.Snap ring C(for shaft) Fig.5-14 Synchromesh The synchromesh mechanism includes the...
Page 77 3rd stage: 1st stage: When force(F) is applied to shifter(1) When hub(2)is pushed further,the tapered surface through the gear shift lever,hub(2) is pushed in the hole of the hub and the tapered surface on in the direction of the arrow.Following the block pin are pressed tightly against each movement of the hub,other parts such as other,this pushes synchro-ring(4) against...
Page 78: Section 2. Specifications
SECTION 2. SPECIFICATIONS 1. WHEEL DRIVE SYSTEM Model T723 Speed shift range forward reverse Reduction forward 1/ 1.304 Reverse shift ratios. reverse 1/ 1.273 Creep off Creep shift Creep on 1/3.322 1/ 2.111 1/ 1.333 Main speed shift 1/ 0.866 1/ 0.697...
Page 79: Section 3.Disassembly,Inspection,And Reassembly
DISASSEMBLY SECTION 3. , INSPECTION, AND REASSEMBLY 1. INPUT SHAFT AND REVERSE CHANGE GEARS (FRONT TRANSMISSION) Fig.5-20...
Page 80 1.1 DISASSEMBLY (1) Removal of input shaft and related parts separate the engine from the front transmission referring to the paragraph 3 of SECTION 4. SEPARATION OF MAJOR COMPONENT in Chapter 2. a. Remove of the reverse change cover in the front transmission b.
Page 81 Fig.5-24 PTO change gears and the lever 5-11...
Page 82 (3) Disassembly of reverse shaft and related parts. (13) Snap ring (14) Creep gear (17) Needle bearing (18) Reverse shaft (20) Needle bearing (33) Bearing (34) Synchro-cup (35) Synchro-hub comp (36) Bearing (37) Snap ring Fig.5-25 a. Pull out the snap ring(13)next to the creep gear(14) b.
Page 83 1.3 REASSEMLBY (1) Sub Assembly of reverse shaft and related parts. Fig.5-26 a. Install Synchro-cups(34) on gear(16) and gear(21) respectively and retain them securely with the snap rings C b. Install synchro-hub comp(35) and above sub- assemblies on reverse shaft(18) Note : As each synchromesh assembly maintains a specified installed width, be sure not to mix different pairs of the synchro-hub comp, and the synchro-cup c.
Page 84 (2) installation of each sub-assembled shaft. a. Refer to the description for all parts around the front transmission PTO shaft Reverse Drive shaft gears Creep gears Main change gears A : Direction of the oil groove Fig.5-27 b. Installation of the creep parts in the reverse metal Note : Be careful direction of the oil groove (to direction of the gear) Fig.5-28 Snap ring...
Page 85 e. Sub-assembly of the sleeve metal with the release bearing and the drive shaft 1. Sleeve metal 2. Oil seal (D) 3. Sleeve 4. Release bearing 5. Spring 6. Bearing 7. O-ring 8. Sleeve metal Sub assembly 9. Bolts Note : Apply grease to the O-ring and the oil seal Fig.5-30 (3) installation of the reverse metal and related parts.
Page 86: Pto Clutch
2. PTO CLUTCH 2-1. DISASSEMBLY (37), (38), (40) BRG (39) NB (44) Snap ring (45) Back-up plate (46) Disc assembly (47) Driven plate (48) Piston (51) Seal ring (52) Seal ring (53) Cover assembly (54) Seal ring Fig.5-32 Note : When installing the PTO clutch assembly, apply a thin coat of grease to the seal rings and install it taking care not to damage these rings.
Page 87 -Inspection for disc thickness and serration wear. Inspection Items Specified values Usable limit Disc thickness 2.6±0.1mm 2.4mm (0.102 in)(7pcs) (0.094 in) Surface flatness 0.2mm (0.008 in) Fig.5-35 e. If the combined thickness of the return plate and brake disc deviates from the specified value, replace both parts.
Page 88 2.3 REASSEMBLY Reassemble the parts in reverse order of e. Install the snap ring in correct direction. disassembly,following these instructions. f. After reassembly, check to see that gear Note: turns smoothly by locking the PTO clutch -Each parts should be washed clean before reassembly.
Page 89: Main Change,Sub-Change,And 4Wd Change Gears
3. MAIN CHANGE, SUB-CHANGE, AND 4WD CHANGE GEARS. (1)Synchromesh transmission version. Fig.5-39 Synchromesh transmission version 5-19...
Page 90 Reverse change gears and related parts. Main change gears and related parts. Fig.5-39 Reverse change gears, Main change gear and related parts. 5-20...
Page 91 3.1 DISASSEMBLY Fig.5-40 Separation the spacer transmission case and rear transmission case from each other referring paragraph 3 in SECTION 4.SEPARATION OF MAJOR COMPONENTS in chapter 2. With this operation, the transmission is divided into the front transmission and the spacer transmission. The front transmission includes the main speed shift, the creep shift mechanisms, and the spacer transmission includes sub-speed shifting and 4WD shifting mechanisms.
Page 92 (1) Disassembly of main change gears(main speed shift), part of sub-change gears(speed range shift) and shifters. Fig.5-41 a. Set the cut away part of the gear so that it b. Remove the tightening bolts of the reverse clears the gear as shown in Fig.5-42 metal (Three straight pins are installed) c.
Page 93 (2) Disassembly of the sub-change gears (Speed range shift) a. Remove the sub-shifter and shifter stay. b. Pull out the PTO shaft , 4WD shaft and gear Fig.5-45 Fig.5-44 c. Remove the snap ring from the end of the pinion gear shaft d.
Page 94 3.2 INSPECTION Before and after disassembly,inspect each part for points mentioned below,and replace if necessary. Inspection Item Standard Value Usable limits Backlash of each gear(measured in meshed condition) 0.1-0.2mm(0.004-0.008in) 0.5mm (0.020 in) Stepped wear of teeth 0.3 mm (0.012 in) +0.10 Assembled width of synchromesh 51.17...
Page 95 3.3 REASSEMBLY Reassemble the parts in reverse order of disassembly, following these instructions. Note: -Each part should be washed clean before reassembly. -Apply multi-purpose,quality grease to needle bearings in advance. -Each bolt and nuts should be tightened to the respective specified torque in accordance with the tightening torque table.
Page 96 a. While holding the gear in the position shown in the drawing,install the assembly of the main change gears and related parts in position by tapping it slightly on the front of a plastic hammer and then the gears by tapping it on the rear. b.
Page 97 (2) Reassembly of sub-change gears (speed range shift) -Reassemble the parts in reverse order of disassembly following next precautions. a. Never forget to install needle roller bearing and collar. b. Pay attention to the installed direction of gear Fig.5-50 4WD drive Sub-change gears Fig.5-51 Fig.5-51...
Page 98 c. Be sure to install the sub-change shifter Fig.5-52 5-28...
Page 99: Rear Transmission
4. Rear transmission case Apply adhesive (TB 1215) Apply grease (TB1901) Fig.5-67 PTO 2 speed Apply adhesive (TB 1215) Fig.5-53. 2 speed PTO version 5-29...
Page 100 3-1. DISASSEMBLY Separate the spacer transmission and the rear transmission from each other and then remove the hydraulic cylinder case. referring to paragraph 5 of SECTION 4. SEPARATION OF MAJOR COMPONENTS in Chapter 2. (1) Ring gear, Drive pinion, and related parts. Fig.5-54 1.Diff case 2.
Page 101 a. Remove the the diff-lock parts. 1.Diff-pinion pin 2.Bolts 3,4.Spring pin 5.Diff-lock clutch Fig.5-57 Note : When assemble the spring pin, 1.Diff-lock shaft 2.Diff-lock metal Be sure the spring pin should be different 3.Pressure spring 4.collar 5.10. Spring pin direction (Ø5 and Ø8) 8.Oil seal 9.Diff-lock pedal 11.
Page 102 (2) PTO shaft and related parts. PTO gears PTO Shift Fig.5-59 1.PTO shifter stay 4.PTO shifter 2.PTO shaft 17.Drive shaft(H/15-12) 8.Arm 19.Change arm 5.Gear (helical/48) 9. Gear(helical/45) a. Remove the rear hitch to the top link b. Remove the change arm(19) c.
Page 103 4.2. INSPECTION Before and after disassembly, inspect each part for the items mentioned below. Parts which deviate from the specified values should be replaced. -Wash clean all disassembled parts and check them for wear, damage, deformation, Burning , etc. Defective parts should be corrected or replaced.
Page 104 When the drive pinion or the ring gear has been Ring gear tightening 5.5-7 Kgf.m replaced, the proper number of shims to be installed should be determined based upon the torque(M10x1.25-25) (34.5 ~ 43.9 ft.lbs) following procedure: Apply lock-tight Note: Drive pinion metal 5.5-7 Kgf.m - As shown in Fig5-64, there are two kinds of...
Page 105 Note : When reassembling the used pinion and ring gear, reinstall the same thickness of shims as was installed before disassembly in each shimming position. h. Backlash adjustment between the drive pinion and the ring pair (Fig5-65) i. As the drive pinion and the ring gear make a pair, be sure not to mate them with other parts from differential tractors.
Page 106 Note : Strike the circumference of the ring gear both sides with a copper hammer by turning the ring gear manually,and check to see that the backlash remains unchanged. The backlash should be checked at four points 90 degrees apart to each other. ⅲ.
Page 107 (2) PTO shaft and related parts. a.Pushing the PTO counter gear end into the bearing until the stop on the gear is securely seated against the bearing.The seal should be coated with an adhesive (THREE BOND TB1215) on the circumference before installing. b.Install the oil seal on the PTO shaft,paying attention to its installed direction.
Page 108: Shifters And Related Parts
5. SHIFTERS AND RELATED PARTS. 5.1. CONSTRUCTION (1)Forward and reverse control linkage mechanism (Reverse speed shifter) (synchromesh transmission version) Fig.5-69 1.Metal(shifter,reverse) 2.Bolt(SP) 3.Nut 4.Washer spring 5.Washer plain 6. Stay lift reverse 7.Reamer bolt 9.Stay shifter reverse 10. Shifter spring 11.Steel ball 12.Arm(reverse) 13.
Page 109 Fig.5-70 Fig.5-71 (2) Main change mechanism(Main speed shift) (Synchromesh transmission version) 1.Rail(shif ter/1 2.Rail(shif ter 3 7..Link 8..Link 12.Guide 14.Metal(Main) 19.Fork(shifter/ main) (1 20..Fork(shifter/main) (3 ,4th) 31.Lever(bar/16)lower 34.Lever(bar/16)upper Fig.5-72 Note : The bolt tightening the bottom of the metal should be coated with an adhesive ahead of time Fig.5-73...
Page 110 (3) Range shifter (Speed range shift) mechanism 1.Stay(shifter,sub) 2.Fork(shifter,sub) (Low) 3.Hook(Shifter,sub) (High-Mid) 4.Steel ball 5.Shifter spring 6.Guide 7.Bolt(S) 8.Metal (SUB) 10,12.Bolt 17.lever(Bar,16) 18.Bolt 19.Snap ring 20.Seal 21.Spring 22. Pin 23.Boots 24.Wire 25.Sub shift speed grip 27. Wire 28.lever(bar/16) 29.Bolt 30.Nut Note: 32.Nut(Fine) The bottom two tightening bolts should be coated...
Page 111 (4) Front drive change (4 WD shaft) mechanism Fig.5-76 1.Metal(shifter) 2.Shifter spring 3.Steel ball 4.Bolt 5.Nut 1.Drive shaft 2.Bearing 6.Washer spring 7.Arm comp 8.O-ring 9.Arm(plate) 3.Bearing 4.Snap ring 10.Spring pin 14.Knob 15.Washer 16. Nut 5.Oil s 6.Gear 17. Pin 18. Washer 19.Pin,Split 20.
Page 112 (5) Creep change mechanism 1.Spur gear 41T) 2.Spur gear 35-18T 3.Needle bearing 4.Collar(38x20,1x3.0) 5.Spur gear 24T 6.Snap ring 8.Hub 9.Snap ring 11.Metal, guide 12.Arm comp 13.Arm plate comp 14.Spring pin 15.O-ring G 16.O-ring P 17.Spring, shift 18.Steel ball 19.Bolt 20.Link(Creeper) 23.Pin creeper comp 24.Arm creeper comp 25.Rod...
Page 113 (6) Rear PTO shift mechanism 1.PTO shifter stay 4.PTO shifter 1.PTO shaft 17.Drive shaft(12/15) 8.Arm 19.Change arm 5.Gear (helical/48) 9.Gear(helical/45) Fig.5-79 PTO 2 speed version Note : ① Pay attention to the installed direction of the metal ⑤Apply lock tight ⑥Apply three bond (TB1215) ⑦Pay attention to the installed direction of the oil seal...
Page 114 REAR PTO counter shaft mechanism Fig.5-81 20.Gear, helical 11-14 21.Bearing(6305) 22.Bearing(6307) 25.Snap ring(25) 26.Snap ring(62) Note: - The snap ring C(25) should be securely seated in the groove and the press-processed side turned towards the outer side. - When pushing the bearing (6305, 6307) into the gear(20), be careful only to push their inner races. - Every time a gear is installed, its smooth rotation should be checked.
Page 115 (8) Drive pinion Sub assembly Fig.5-84 3.Washer(30X46X3) 4.gear spur 24T 5.Hub(30x62x19), 6.Coupling ⑥.Gear super 30T,4WD 12.needle bearing 7. Snap ring (shaft) 19.Hub(35X51X21),Coupling(52x72x18) 19-01.pinion drive 11T 22.Nut(M40x1.5) 23.Taper roller bearing 24.Metal pinion 32.gear spur 46T Note: a.Apply oil to the drive pinion and related parts ahead of time. Then install them and tighten the assembly to the specified torque.
Page 116 (9) Differential gears. Refer to Parts catalogue (Fig5-86) Note: 1.When assembling without replacing the pinion gear and ring gear with new ones, provide the same shimming thickness as that provided before disassembly. 2.Backlash between diff-pinion and diff-side gear should be within as range of 0.1 to 0.2mm (0.004-0.008 in) and these parts should turn smoothly.
Page 117 5-2 PRECAUTIONS FOR DISASSEMBLY, INSPECTION, AND ASSEMBLY (1) Disassembly When drawing a shifter stay from its shifter,be careful not to lose the steel ball.It can jump out of the shifter. (2) Inspection -Shifter –disengaging load: Main change and sub change : 18-22 Kgf (40-49lbs) 4WD change, Creep change : 25-29 kgf (55-64 lbs) -Usable limit of shifter-disengaging load: Main change &...
Page 118: Section 4. Troubleshooting
SECTION 4. TROUBLESHOOTING 1. WHEEL DRIVE SYSTEM Problems Causes Countermeasures Transmission makes Insufficient or improper lubricant Replenish or replace noise in neutral Excessive splines of change shaft,spline hub,etc Replace Worn or broken bearings Replace Slide couplings interfering with the gears due to Replace worn or deformed shifters Gears make a noise...
Page 119: Pto Drive System
2. PTO DRIVE SYSTEM problem Causes Counter measures PTO does not spin with PTO PTO shift lever is in neutral Shift lever positively shifted to ON to ON Defective PTO switch replace Clogged PTO valve Wash clean Poor Pump Replace Defective solenoid valve Replace PTO spins but does not...
Page 120: Power Train Diagrams
Power train diagram(A3) Fig.5-88 5-50...
Page 121 CHAPTER 6 FRONT AXLE CHAPTER 6. FRONT AXLE(4WD) ---------------------------------------- SECTION 1.GENERAL DESCRIPTION ---------------------------------- SECTION 2. SPECIFICATIONS -------------------------------------------- SECTION 3.DISASSEMBLY,INSPECTION,AND REASSEMBLY-- 1. Center pivot ----------------------------------------------------------------- 1-1. Disassembly -------------------------------------------------------------- 1-2. Inspection ----------------------------------------------------------------- 1-3. Reassembly --------------------------------------------------------------- 2. Front differential ----------------------------------------------------------- 2-1. Disassembly -------------------------------------------------------------- 2-2.
Page 122: Chapter 6 Front Axle(4Wd)
Chapter 6 Front axle(4WD) 1. GENERAL DESCRIPTION The 4WD front axle is a center pivot type.The front wheel drive mechanism is incorporated as a part of the axle. The front wheel drive power is taken off the rear transmission and transmitted to the differential in the front axle where the power is divided into right and left and to the respective final cases.
Page 123: Section 2. Specifications
SECTION 2. SPECIFICATIONS T723 Wheel alignment Toe-in (mm) 0~5 mm Camber 2° Caster 15° Φ55 Front axle Pivot metal (F) bore (mm) Φ106.3 Pivot metal (R) bore (mm) Pivot metal (F) bush (mm) 50X55X35 Pivot metal (R) bush (mm) 100X106.3X30 Φ50...
Page 124: Section 3.Disassembly,Inspection,And Reassembly
SECTION 3. DISASSEMBLY,INSPECTION,AND REASSEMBLY 1. CENTER PIVOT Fig.6-3 17.Seal washer 1.Housing,front axle 9.Plug 18.Nut 2.Case(Front axle) 10.Support(Rear) 19.Bolt 3.Pin(A) 11.Collar(105.5X126X3.2) 20.O-ring 4.Stud 12.Nipple 22.Connector 5.Washer spring 13.O-ring(101.19X3.53) 23.Hose(Fuel/829) 6.Nut 14.Support(Front) 24.Clamp 7.Bolt 15.Space 25.O-ring 8.Oil Cap (B) 16.O-ring...
Page 125: Disassembly
2) FRONT AXLE BUSH BORE DIAMETER 1.1.DISASSEMBLY 1) Dismount the front wheel drive shaft, Measure the bore diameter of the roll bush in the referring to the pertinent paragraph in chapter 2. pivot metal (F). If the measured value exceeds 2) Remove the right and left tie rods.
Page 126 Note: After correcting the pivot metal play, tighten the lock nut of the adjusting bolt to a torque of 11.7~13.7KN-m (12~14 kg-m) 5) The reassembled front axle should rock smoothly while pivoting. 6) When the tie-rods are reinstalled,the toe-in should be adjusted.At the same time, the steering angles of the both wheels should also be adjusted.
Page 127: Front Differential
2. FRONT DIFFERENTIAL Fig.6-10 1.Bevel gear(9-24) set 2.Diff case 3.Diff side gear 4.Thrust washer(40X58X1) 5. Diff pinion 6. Diff pinion washer 7.Diff pinion shaft 8.Spring pin 9.Spring pin 10.Ball bearing 11. Snap ring 12.Shim(67X72X0.1) 13. T.R.B 14.Collar,Spacer 15.Sleeve 16.Spacer collar 17.Snap ring 18.Nut(M30) 19.
Page 128: Disassembly
Note: 2.1 DISASSEMBLY The number of shims(1) installed and the the 1) As concerns operation prior to removal of shimming thickness should be noted for later the front axle,refer to the paragraph covering reference. disassembly of the center pivot 2) Remove both wheels 6) Remove the bearings from the Axle housing 3) Remove the drain plug from the final case and And the ring gear,and then the ring gear can...
Page 129: Reassembly
2-3.REASSEMBLY Specified thrust play 0.13-0.2 Reassembly the parts in reverse order of mm(in) (0.005-0.0078 in) disassembly,following these instructions. Note: 1)Each friction surface should be coated with grease in advance. TRB and collar should be replaced as a pair. 2)The bevel pinion and the ring gear make a distinct pair after a mesh adjustment (1) Bevel pinion (8) performed at the factory.
Page 130 Fig.6-16 3) DIF CASE AND BEVEL PINION 1.shim 2.shim 3.shim 4.Parallel pin Fig.6-17 Note: Discard the removed straight pin and oil seal and install a new pin and Oil seal 1) Each friction surface should be coated when reassembled, because this pin and oil with grease in advance.
Page 131: Final Case
3. FINAL CASE 3-1. Final gear case 1. Fig.6-18 1.Final case 2.Gear bevel(10) 3.Ball bearing 4. Shim(88X100X0.1) 5.Shim (88X100X1.5) 6.Snap ring 7.Shaft 8.Mechanical seal 9.Ball bearing 10.Oil seal 12.Ball bearing 13. Link arm 14.Pin 15.Washer spring 16.Bolt 18.Cap(100) 19.Plug 20.Final case 22.Ball bearing 23.Gear bevel(17) 24.O-ring...
Page 132 3-2. Front gear case 2. Fig.6-19 1.Shaft wheel 2. Mechanical seal 3.Cover 4.Ball bearing 5.Washer(50.5X60X3) 6.Snap ring 7.Gear(bevel 10-43) 8.Ball bearing 9.O-ring 10. Stud 11. Washer spring 12. Nut 13. Bolt 3.1 Disassembly 1) Drain oil from the final case by removing the drain plug.
Page 133: Inspection
9) Remove the cap (11) from the bottom of the final case B and detach the snap ring(hole). Then the counter shaft(7) and BRG can be removed. Note: The removed cap(100) (black plug) should be discarded and replaced when reassembled. 3.2 INSPECTION Fig.6-21 1) Wheel shaft cover...
Page 134: Reassembly
7) After adjustment of the toe-in,perform road tests.There should be no abnormalities such as vibration,abnormal noises,defected steering wheel operation,etc. Wheel shaft cover 1) Every snap ring(6) should be seated securely in its groove. 2) Be sure the numbers of Bevel gear is correct Fig.6-25 3.3 REASSEMBLY Reassemble the parts in reverse order of...
Page 135 - STEERING CYLINDER 8) Adjust backlash between gear bevel and gear bevel (2) with collar Back lash 0.1-0.2 mm(in) (0.003-0.008 in) 9) Apply an adhesive to the Cap (100),and be sure not to deform when installing. Note: Refer to Fig.6-23 - FINAL DRIVE CASE AND HOUSING Fig.6-30 Fig.6-28...
Page 136: Section 4.Trouble Shooting
SECTION 4. TROUBLE SHOOTING PROBLEMS AND PROBABLE CAUSES COUNTERMEASURES ● Steering wheel hard to turn 1)Too low tire inflation Inflate to specified value 2)Broken thrust bearing Replace 3)Stuck or broken ball joint of tire-rod end Grease or replace 4)Seizure or poor lubrication of axle end bush Grease or replace ●...
Page 137 CHAPTER 7 Rear axle and brakes SECTION 1.GENERAL DESCRIPTION ----------------------------------- SECTION 2. SPECIFICATIONS --------------------------------------------- SECTION 3.DISASSEMBLY,INSPECTION,AND REASSEMBLY -- 1.Rear axle housing and brake system-------------------------------------- 1.1. Disassembly ----------------------------------------------------------------- 1.2. Inspection ------------------------------------------------------------------- 1.3. Reassembly ----------------------------------------------------------------- SECTION 4.TROUBLE SHOOTING----------------------------------------...
Page 138: Section 1.General Description
Chapter 7. Rear axle and brakes 1. GENERAL DESCRIPTION The rear axle system is of the central axle type,which contains the final reduction gears, differential gears with diff-lock,and brakes. The power from the engine is transmitted to the right and left wheel pinions through the differential gears,and reduced in the revolution to the rear wheels by the wheel gears.
Page 139: Section 2. Specifications
SECTION 2. SPECIFICATIONS MODEL T723 Type Helical gears Final reduction gears Reduction ratio Friction Type Wet, multi-disc, Mechanically operated Plate Φ140(Φ5.5in)xΦ180mm(Φ7.0 in) diameter Thickness 3.4±0.1 mm(0.134 in) Lining material Paper base Brake system Number of plates 5 on each side Φ188mm(Φ7.4 in)
Page 140: Section 3.Disassembly,Inspection,And Reassembly
SECTION 3.DISASSEMBLY,INSPECTION,AND REASSEMBLY Separate the rear axle housing from the rear transmission referring to paragraph 6 of SECTION 3. SEPARATION OF MAJOR BLOCKS in Chapter 2 1) REAR AXLE HOUSING AND BRAKE SYSTEM 1.Brake assy LH 2.Return spring 3.Steel ball 4.Brake disk comp 5.Separate plate 6.Brake metal LH...
Page 141: Disassembly
1.1 Disassembly 1.2. INSPECTION 1) Remove the brake cover tightening bolts and 1) Friction plates. remove the disc brake assembly on it. Replace the plates whose surfaces have been 2)The actuator can be disassembled by removing become glossy by carbonization or whose Spring thickness exceeds the usable limit.
Page 142: Reassembly
2) Actuator (Reference) 4) Wheel shaft Check the ball,spring,pressure plate,and brake rod for abnormality.Replace defective parts. Replace Check the shaft for abnormalities like wear, the actuator whose thickness exceeds the usable damage, etc, and replace a defective one. limit. 5) Bearings Check them for abnormalities like hitching, irregularity, etc.
Page 143 4) Replace the mechanical seal. Install the taper roller bearing into the axle Take care not to deform housing, and the mechanical seal by the special these portions tool as shown in the figure(Fig.7-8) 5) Install the wheel gear and bearing on the wheel shaft and retain them with nut.
Page 144: Section 4.Trouble Shooting
SECTION 4. TROUBLESHOOTING Problem Causes countermeasures 1) Rear axle · Worn or damaged bearing Replace Noises · Worn gear or wheel shaft Replace 2) Brake system · Insufficient depressing of brake Depress pedals pedals positively (1)Insufficient braking force · Improper pedal free play Adjust ·...
Page 145 Chapter 8 Power assisted steering system SECTION 1.GENERAL DESCRIPTION----------------------------------- SECTION 2. SPECIFICATIONS--------------------------------------------- 2.1 Gear pump ------------------------------------------------------------------ 2.2 Steering valve --------------------------------------------------------------- 2.3 Oil tank ---------------------------------------------------------------------- SECTION 3. FUNCTION ------------------------------------------------------ 3.1 Open center non load reaction------------------------------------------- SECTION 4.DISASSEMBLY,INSPECTION,AND REASSEMBLY 4.1 major component of steering valve assembly------------------------- 4.2 Special tools ----------------------------------------------------------------- 4.3 Disassembly ----------------------------------------------------------------- SECTION 5.
Page 146: Power Assisted Steering System
Chapter 8. Power assisted steering system. SECTION 1. GENERAL DESCRIPTION The hydraulics of this power-assisted steering system are actuated by a specially designed steering valve system. Non Load reaction valve blocks the L,R cylinder ports in neutral condition and does not transmits the reaction load of the tire to the steering wheel in neutral.Generally the system is used for the vehicles that treat heavy equipment or low speed traveling.
Page 147: Section 2. Specifications
SECTION 2. SPECIFICATIONS 1) GEAR PUMP (Power Steering) MODEL T723 Delivery (cc/rev) Displacement (ℓ/min) 17.7 (2200rpm x 34/73*73/33*23/19) ( at 90% ) 1000 rpm 6.2 LPM At 150 Pump performance 1800 rpm 11.9 LPM (kgf/cm 2600 rpm 17.5 LPM Maximum pressure (kgf/㎠) 210 kgf/㎠...
Page 148: Section 3. Function
SECTION 3. FUNCTION 1.Open Center Non Load Reaction 1.Neutral Position When the steering control valve is in the neutral position,inlet flow(P) from the priority valve moves the flow selector spool against its spring.This flow is blocked at the control valve control spool.The signal port is connected to the reservoir(T) through orifices in the control spool.The priority valve will only supply enough oil to the control valve to compensate for internal leakage and maintain low stand-by pressure.The oil at each side of the steering cylinder is connected to each side of the...
Page 149 2. Right Turn When the steering control valve shaft is rotated to the right,the control valve moves off center.This connects the inlet port (P) to one port of each metering pump section and also connects the other port of each metering pump section to the cylinder.The amount that the spool moves off center depends on how fast the steering wheel is rotated and also how much effort is required to turn the wheel.
Page 150 3. Left turn When the steering control valve shaft is rotated to the left,the control valve spool moves off center.This connects the inlet port(P) to the one port of each metering pump section and also connects the other port of each metering pump section to the cylinder.The amount that the spool shifts off center depends on how fast the steering wheel is turned and how much effort is required to turn the wheel.
Page 151 4. Manual steering When there is no piston pump supply pressure the flow selector is moved to the left by its spring.This connects together the inlet and outlet ports of the lower gyrotor pump and disconnects this pump from the system.When the steering is operated manually,only the upper gyrotor pump section is used to direct flow to the steering cylinder.
Page 152: Section 4.Disassembly,Inspection,And Reassembly
SECTION 4. Disassembly, Inspection, And Reassembly 1. Major component of steering valve Fig.8-6 1.Cover bolt(6) 2. Cover bolt(1) 3. End cap(1) 4.Gyrotor(1) 5. Spacer(1) 7.Spacer plate(1) 8.Driver shaft(1) 9.Pump body(1) 10.Sleeve(1) 11.Spool(1) 12.Pin(1) 13.Center springs(6) 15.Thrust washer(2) 16.Thrust bearing(1) 17. O-ring(1) 18.Seal ring(1) 19.Dust seal(1) 20.Retaining ring(1)
Page 153: Special Tools
2. SPECIAL TOOLS STEP 4. For pumps equipped with cross over check ①Torque wrench(Torque 5㎏f·m) ----------------1 valves,mark position and remove spring, ②5/12″-12 socket ----------------------------------1 valve pins and balls. ③“- ”Driver(big) ------------------------------------1 ④“- ”Driver(small) ----------------------------------1 IMPORTANT:Do not use a magnet to ⑤Centering spring installer ------------------------1 remove balls.
Page 154 STEP 9. Lubricate and install new o-rings onto check valve seat.Install check ball retainer,check ball and check valve seat into the pump body.Make O-ring sure the threaded end of check valve is facing outward.Install and tighten plug to a torque of 11Nm(100 lb in).
Page 155 NOTE: Make sure the centering spring notches STEP 15. locate correctly into the sleeve. STEP 13 install pin into sleeve assembly and install sleeve into the pump body. Install spiral retaining ring into the the groove in the NOTE:Heat from your hands may expand spool pump body.Use a screwdriver to make sure the and sleeve assembly,preventing the assembly spiral retaining ring is located correctly into the...
Page 156 STEP 17 install rotor onto drive shaft.Make sure one of the rotor teeth is aligned with the connector mounting face.Lubricate and install a new o- ring into the groove in plate.Align the marks made in STEP 2, and install stator.Make sure the o-ring groove in stator is facing outwards.
Page 157 Align the marks made in STEP 2,and install the end cap.Install and evenly tighten the torx hand screws in two stages to a torque of 17 Nm(12 lb ft) then to 25 to 30 Nm (19 to 22lb ft) in the sequence shown.
Page 158: Section 5. Troubleshooting
SECTION 5. TROUBLESHOOTING Problems and probable causes Counter measures 1. Steering wheel is very heavy to turn 1) Poor assemble between steering column and unit. (1)Spline of column and unit are assembled -Replace column spline tightly. (2)Spool of unit is seized by spline of column -Check column assembly face and spline length (MAX 6.5㎜) (3)Poor rotation of column...
Page 159 Problems and probable causes Counter measures 3. Free play of steering wheel 1)Too low elastic of centering spring ( Remove P port pipe line and check left and right turning) -Replace spring (1)Damaged spring or poor elastic 2) Depressed control set (1) Excessive fluid and pressure -Adjust fluid level and pressure properly (2) Depressed by foreign material...
Page 160 Problems and probable causes Counter measures 8.Serious kick-back each side (1)Poor assemble the gyrotor lower the unit -Reassemble 9. Steering wheel is very heavy to begin turning (1)Oil density is too high or cool -Replace oil 10. External Oil leakage (1)column -Replace oil seal,slide ring (2)End cap gyrotor...
Page 161 Chapter 9 Hydraulic system SECTION 1. GENERAL DESCRIPTION -------------------------------- SECTION 2. SPECIFICATIONS ------------------------------------------- SECTION 3. DISASSEMBLY AND ADJUSTMENT------------------- 1.Hydraulic system ----------------------------------------------------------- 2.Disassembly------------------------------------------------------------------ 3.Reassembly------------------------------------------------------------------- 3.1 General precautions---------------------------------------------------- 3.2 Reassembly steps-------------------------------------------------------- 4.Adjustment of the link mechanism-------------------------------------- SECTION 4. MAJOR COMPONENT OF THE HYDRAULIC 9-11 SYSTEM -------------------------------------------------------- 9-11...
Page 162: Section 1. General Description
Chapter 9 Hydraulic system SECTION 1. GENERAL DESCRIPTION The hydraulic system is composed of a gear pump,valves,oil filter,cylinder(actuator),piping,etc.The implement lift is operated by a control valve which is actuated by the control lever through a link mechanism. ON and OFF of the PTO is controlled by a hydraulic,wet,multi-disc clutch whose circuit is opened and closed by an electromagnetic valve in the flow-divider.
Page 164: Section 2.Specifications
SECTION 2.SPECIFICATIONS MODEL T723 Piston and cylinder Hitch lift capacity, lb.(kg) 4,330 (1,964) Control valve Cylinder port leaks (under a pressure of 9800KPa[(100Kgf/㎠) 5cc(0.305 Cu in) with gear oil of SAE 80)] Main relief valve Max. pressure 200 Kgf/㎠ Relief pressure 170 +5 Kgf/㎠...
Page 165: Section 3. Disassembly And Adjustment
SECTION 3. DISASSEMBLY AND ADJUSTMENT 1.HYDRAULIC SYSTEM Fig.9-2 1.Cylinder 2. O-ring 3.O-ring 4.Ring 5.Piston,Hyd. 6.Rod piston 7. Pin 8. Wire. 9.Lift crank 10.Plate 11.Relief valve 12.Knob 13.Shaft 15.Valve flow control 16. O-ring 17.Bolt(M12) 18. C-ring(shaft) 19.Arm,Lift 20.Bush(50X55X44) 21.Bolt(M8X50) 22.Clevis 23.O-ring 24.Ring, back up 25.Arn,Lift 26.Bar...
Page 166: Disassembly
2.DISASSEMBLY 1)Remove the cylinder case assembly,referring to relevant paragraph in Chapter 2. Fig.9-4 4) Applying aligning marks on the Lift shaft(26) and right hand lift arm(19),Then remove the Fig.9-2-2 Note: Put the cylinder case on a wooden plank to prevent the surface from damage. 2) Separate plate (position/draft) from lever (position/draft) sub Remove the split pin and washer...
Page 167: Reassembly
7) Remove the set bolt for the lift crank and 10) Remove the bolt and extract the main remove the assembly of the lift shaft and lift arm. control valve bolt bolt Fig.9-8 8) Remove the assembly of the lift crank and piston rod.
Page 168 5) When assembling the lift crank on the lift 7) When installing the control valve,apply grease shaft,mesh their splines using the alignment to the o-rings and avoid their dislocation or marks which were put their before Disassembly binding during tightening the valve to the specified torque 8) Tighten the slow return check valve to the specified torque...
Page 169: Reassembly Steps
4) Install the lift crank temporarily along with the feed back link.Install the piston on the lift crank. Apply loctite Tightening: 170~250kg-cm Fig.9-19 3.2 REASSEMBLY STEPS. Fig.9-22 1) Install the main control valve 5) Install the lift shaft and lift crank together in accordance with the aligning marks on them.
Page 170 Point 3.Set the feed back link so that there is no play by the adjusting nut. Point 4. Apply an locktite to adjusting Nut. Fig.9-28 Thus the adjustment of the position control linkage is completed. 2) Adjustment of the draft-control link mechanism Point 1.Shift the draft-control lever to the top position and the position-control lever to...
Page 171: Adjustment Of The Link Mechanism
4. ADJUSTMENT OF THE LINK MECHANISM. Fig.9-25 1) Adjustment of the position control link Point 2. Fix the clearance between the body and mechanism plate on the control valve and the casing spool to be 10 mm,while the gap A Place the cylinder case assembly upside so that the should be 26mm (Fig.9-27),while the lift arm can be moved freely...
Page 172: System
SECTION 4. MAJOR COMPONENTS OF THE HYDRAULIC SYSTEM 1. MAIN CONTROL VALVE 1.1 GENERAL DESCRIPTION (Reference) This valve controls the lifting and lowering operation of the hydraulic cylinder. It has especially been developed to control the working height of the implement. It consists of a feed back valve; direction control valve, flow-control unloading valve,and holding check valve.
Page 173 1.4 DISASSEMBLY AND INSPECTION (Reference) Fig.9-31 9-12...
Page 174 1.5 OPERATION Port p means “pump port”,and is connected to the pump,while port C means “Cylinder port”, and is connected to the cylinder.Drain ports T1 to T4 are connected to the tank. 1) Neutral position Fig.9-32 In the NEUTRAL position,Spring chamber of unloading valve connected to TANK(T2),Therefore the force imposed upon the right hand side of the unloading valve, then the fluid from the pump flows into TANK(T1).
Page 175 2) Lifting position Fig.9-33 When the main spool is shifted to the lifting position,Passages to the Tank(T2) are closed with unloading spring and the Fluid from the pump flows into unloading valve spring.,therefore the force imposed up the left-hand side of the unloading check valve,Consequently the fluid in the T1 port becomes to close the unloading.
Page 176 3) Lowering position Fig.9-34 When Main spool is shifted to the lowering position,Unloading spring is connected to the Tank(T2),and the force imposed up the right hand side of the unloading check,therefore the fluid from the pump flows into the Tank(T1). Consequently the force imposed up the left hand side of the main check valve,which is connected with Plate-B to open the T3 port.
Page 177 1.6. SERVICING INSTRUCTIONS Note: (Reference) The spool and stopper bolt are tightened with each other with adhesive applied to their threads, 1) Required tools so they should not be separated unless required. -6mm set screw wrench and torque Wrench by removing the stopper bolt, the poppet and -19mm spanner and torque wrench spring can be taken out of the spool.
Page 178 Put the poppet into hole B as shown in the figure and make sure that the poppet slides smoothly.Then put the spring in and tighten the the plug,on which the O-ring must be installed, to the specified torque. -unloading valve(1) and related parts. Install the spool into hole C(Fig.9-8) in the correct direction.
Page 179: Flow-Divider
2.FLOW-DIVIDER( PTO solenoid valve) 2.1 GENERAL DESCRIPTION This valve is installed to bypass working fluid of a specified pressure from the main circuit into the PTO circuit through a fixed orifice.It includes a changeover valve for engaging and disengage the PTO clutch by means of a solenoid and a sequential valve for PTO circuit's over the main circuit.
Page 180 -When the solenoid is switched 「ON」 The fluid from the pump flows to port B through port P,the pressure-reducing valve,and the changeover valve. The pressure of the PTO clutch circuit and that of passage(2) are the same and will be set as P₂.The pressurized fluid acts on the left-hand side of the valve,passing through port ;...
Page 181 -When the solenoid is switched 「OFF」: The fluid in the PTO clutch is unloaded to the bank through port B.Consequently pressure P2 at passage(2) becomes zero,whereas the pressure at passage (1) is P1.Then the force imposed upon the left side of spool (P1)overcomes the force imposed upon the right side (P2+spring force),so that the spool is pushed rightwards to connect port P and part A.
Page 182: Pressure Control Valve
3. PRESSURE CONTROL VALVE 3.1. GENERAL DESCRIPTION This valve is composed of the body, plunger, piston, springs, and plug. It serves to absorb shocks which are given when the PTO clutch engages. 3.2. OPERATIONS 1) When the clutch cylinder is achieved: When the PTO clutch valve is turned on,the cylinder is activated.Consequently the pressure in circuit does not leave the seat of body(4) because the preset force by spring(8) and spring(9) is larger.Therefore there is no flow of fluid from port B to port T,which means all the fluid from the...
Page 183 2) When the clutch is in half-engaged state: When the clutch cylinder is completely activated,the pressure in circuit(1) starts rising at point P1 on the graph in Fig.9-42.When the pressure reaches point P2,the piston starts moving to the right overcoming the force of spring(6 and 7). Here the flow through chock(2) causes some difference in pressure between circuit (1) and chamber (3) .
Page 184 2) When the clutch is engaged completely When the piston(6) moves to the end,there is no flow through chock(2) and the pressures in chamber (3) and circuit(1) become equal,that is,the pressure which the plunger receives on both sides are the same.Consequently,plunger(7) is pushed back to the left by the force of spring(9),which closes the passage from port B to port T.With this,the pressure in circuit(1) starts rising at point P3 up to the supplied pressure.Thus the clutch engagement is maintained.
Page 185: Flow Control Valve
4. FLOW-CONTROL VALVE(SLOW-RETURN CHECK VALVE) 4.1. GENERAL DESCRIPTION This valve regulates the lowering speed of the lift by controlling the unloading flow from the lift cylinder to the tank. ① Dust seal ② Snap ring ③ Collar ④ Body ⑤ 0-ring ⑥...
Page 186 4.2 OPERATIONS 1) DOWN position 2) Up position The fluid from port B pushes up stop ring (9) of The flow port A,overcoming the force of poppet(10) until the ring comes into contact with spring(11),pushes up poppet (10) and choke(C)is adjust screw(6),as it reaches chamber(R).
Page 187: Safety Valve
5.SAFETY VALVE( Reference) 5.2 OPERATION 5.1 GENERAL DESCRIPTION With the chock closed completely by turning the This valve is installed in the slow return check adjust screw tightly clockwise,the implement valve circuit and able to be installed in the mounted on the lift is held at a specified cylinder case instead of Bolt.When the adjust height.While the tractor is traveling on roads in the screw of the slow return check valve is closed...
Page 188 3) MEASUREMENT OF THE RELIEF PRESSURE (1) 3 POINT TO TEST RELIEF PRESSURE ① Remove the plug on the rear side of the transmission case and install a compression gauge to measure the pressure. Check Point Fig.9-48 Keep the engine speed at 2600 rpm and shift the position control lever at the highest position.
Page 189: Gear Pump
7.GEAR PUMP 7.1 GENERAL DESCRIPTION This pump induces fluid from one side and delivers it from the other side,by rotating two gears meshed with each other. The actual delivery is as mentioned below,considering the consequences of fluid temperature and volume efficiency in accordance with revolution speed. That is dual pump system.
Page 190 ③ Remove front and rear pump. 7.3 DISASSEMBLY (Reference) Be sure not to be damaged the o-ring or steel NOTE: ball ① Before disassembling the pump,wash the outside clean.In the course of disassembling operation,all disassembled parts should be kept aside in a clean place such as on clean paper or cloth and be handled carefully so as to prevent them from becoming dirty or damaged.
Page 191 3) REASSEMBLY ④ Tightening sequence and torque of the pump ① Install the rear pump. cover tightening bolts. ▶Install the bushing seal to bushing. ▶Tightening torque: 2.5∼2.8㎏f·m ▶Install the bushing,drive gear,gear,and bushing to the housing. ▶Install the o-ring to the cover. ▶Install the cover to the housing.
Page 192 4) INSPECTION AND REPAIR (3) Bushing ① With clean working fluid,surfaces are (1)Check all disassembled parts for damage rarely scratched and should be smooth. and wash undamaged or usable parts in ② If there are many scratches on the bore clean diesel fuel or kerosene except rubber parts.Inspect all parts referring to these walls, or on parts which are in contact with...
Page 193 (4) GEAR ① With clean working fluid,surfaces are rarely scratched and should be smooth. ② If roughness can be felt by a finger nail,they are darkened,or the shaft diameter is less than 0.03 mm replace the shaft. ③ Usable shaft diameter is as below Fig.9-66 gear shaft (5) Oil seal The oil seal prevents oil leaks by its inner seal lip...
Page 194: Filter
8.1 GENERAL DESCRIPTION The tractor is equipped with two oil filters: suction filter(1) and line filter(4),for better filtration. 8.2 SPECIFICATIONS 1)Suction filter Model T723 Applicable oil DONAX TD or RPM THF 500 Rated flow rate(ℓ/min.) Filtration density 150 mesh 790 ㎠...
Page 195: Section 5.Remote Hydraulic Control (Optional)
SECTION 5. REMOTE HYDRAULIC CONTROL 1.GENERAL DESCRIPTION - A hydraulic operated implement can be driven and controlled with this optional remote hydraulic control valve set. The valve is connected between the gear pump and the main control valve and is given a priority to draw hydraulic power.
Page 196: Specifications
3. SPECIFICATIONS Type Spring Center Floating Detent Maximum flow (ℓ/min) 45 LPM 45 LPM Maximum pressure (kgf/㎠) A and B port leak Oil temperature:50℃(122℉) 9 cc/min below 20 cc/min below Under a load of 100 kgf/㎠ Recommended fluid THF 500 THF 500 Operating temperature range -20℃~80℃...
Page 197: Section 6. Troubleshooting
SECTION 6. TROUBLESHOOTING Problems Causes Countermeasures 1.Lift does 1) Insufficient engine speed Raise engine speed slightly not rise 2) Insufficient transmission oil Maintain oil level by replenishing with the same kind of oil 3) Air taken in through suction Tighten securely or replace broken parts. 4) Clogged suction filter Clean.
Page 198 Problems Causes Countermeasures 2.Too low 1)Above causes can also be Repair according to above instructions. rising speed of possible lift 2) Too small a spool stroke in Inspect,readjust,or replace link mechanism if necessary. control valve 3)Broken compensator spring Replace spring. (unloading valve 1) in control valve 4)Stuck poppet...
Page 199 Problems Causes Countermeasures 8.Pump noise 1) Partially clogged suction filter or Clean. suction piping. 2) Air inhaled through suction Inspect and retighten. piping and intake pipe connections for pump 3) Loosened pump cover tightening Inspect and retighten bolts. 4) Too rich oil viscosity Replace with fluid of adequate viscosity.
Page 200 Problems Causes Countermeasures 14.Independent 1) Stuck pressure-reducing valve Lap after correcting flaws with oil stone PTO clutch is too spool quick in engaging 2) Fatigued or broken pressure- Replace. reducing valve spring 3) Worn or broken sealing of PTO Replace clutch 4) Worn friction plates or driven Replace...
Page 201 Chapter 10 Electrical accessory and instruments SECTION 1. GENERAL DESCRIPTION ----------------------------- 10-1 SECTION 2. SPECIFICATIONS --------------------------------------- 10-1 SECTION 3. BATTERY --------------------------------------------------- 10-2 1.1. Inspection -------------------------------------------------------------- 10-2 1.2. Inspection of electrolyte level--------------------------------------- 10-2 1.3. Inspection of electrolyte specific gravity-------------------------- 10-2 1.4. Battery testing chart-------------------------------------------------- 10-3 SECTION 4.
Page 202: Section 1. General Description
(thermometer), fuel gauge, etc. are installed. All the controls,meters, and indicators are arranged around the operator’s seat for easy Maneuverability readability,and convenience. SECTION 2. SPECIFICATIONS MODEL T723 PART NAME Specification(w) Quantity 1.lighting Head lights (High/Low)
Page 203: Section 3. Battery
SECTION 3. BATTERY Note: When the distilled water is added,charge the 1.INSPECTION battery to mix it well into the electrolyte before measuring the specific gravity. 1.1 INSPECTION OF ELECTROLYTE LEVEL As the battery repeats charging and discharging a.Temperature correction of the hydrometer during operation.The water content in the reading electrolyte gradually evaporates, and as a result,the...
Page 204: Battery Testing Chart
1.4 BATTERY TESTING CHARTS Step 1. VISUAL INSPECTION Check for obvious damage such as cracked or broken case that shows loss of electrolyte,thermal damage,etc. Obvious damage No obvious damage Replace battery Check electrolyte level Electrolyte level is below top of Electrolyte level is above top of plates in one or more cells plates in all cells...
Page 205 Step 3 Load test 1.Connect voltmeter and ampere load equal to ½ the cold cranking amperes(18℃) rating of the battery for 15 seconds. 2. Observe voltage at 15 seconds with load on.Disconnect load 3.Place thermometer in one cell to take temperature of electrolyte. 4.Refer to voltage table Voltage below table value Voltage equal to or above table...
Page 206: Section 4. Meters And Switches
SECTION 4. METERS AND SWITCHES 1.METERS The generated pulses are converted into voltage 1.1 Removal output through a converter.Then the voltage is divided into three different phase coils through a a. Disconnect the cable from the negative post. IC circuit.The tachometer pointer is swung by b.
Page 207: Thermometer
b.Inspection -Fuel meter Note: Connect the fuel gauge to form a circuit with the 1) Figures in parentheses are reference value resisters as shown Fig.10-6 and check to see if 2) Inspect each position in order F to E the gauge pointer swings to each position: F.1/2 3) Read values in three minutes.
Page 208: Combination Switch
(2) Inspection a.The main switch circuit,switching positions, and terminals are as shown in the figures. Check the continuity across respective terminals referring to the switch circuit diagram. Replace a defective switch as an assembly Fig.10-12 (2) Release the ring nut with a conventional screw drive(-) and remove the combination switch.
Page 209: Stop Light Switch
-Lighting 4. STOP LIGHT SWITCH Color code (Yellow / (Red / (Red) (Orange / Green) red) Yellow) 9 : B1*1 5 : T 4 : 1 10 : 2 ● ● ● ● ● ● Fig.10-15 Stop light switch Capacity 10~20A (DC12V) :Terminals 3 ±0.5mm...
Page 210 7. Each fuse is connected as follows Note : Using a large capacity fuse or wire burn 1. PANEL out the wiring system. 2. LIGHT, HORN Use fuse tongs to replace fuses 3. TURN SIGNAL 4. BRAKE/REVERSE LAMP 5. WORKING LIGHT 6.
Page 211 8.Trailer socket A hella’s 7-pin trailer socket is equipped as a standard equipment.Lamp on a trailer can be operated through the socket. Fig.10-23 Socket No. Description Color Specification Wire Housing Turn signal (LH) AVSS 0.85 Reserve light (Fog light) AVSS 0.85 Earth AVSS 0.85 Turn signal (RH)
Page 212 SECTION 5. EARTHING (GROUNDING) POINT 1.Front axle bracket (RH) Fig.10-24 1) Front axle bracket (RH) Earthed at upper tapped hole in the axle bracket. Fig.10-25 2) Contact surfaces of the axle bracket and engine where they tightened together 10-11...
Page 213 SECTION 7. WIRING INSTRUCTION DIAGRAM Fig.10-29 10-15...
Page 214: Section 7. Troubleshooting
SECTION 7. TROUBLESHOOTING Important: Whenever effecting a repair the reason for the cause of the problem must be investigated and corrected to avoid repeating failure. The following table lists problems and their possible causes with the recommended remedial action 1. LIGHTING SYSTEM Problems Causes Countermeasures...
Page 215 Problems Causes Countermeasures Individual Burnt out bulb Check and renew turn signal Corroded or loose bulb contacts Inspect,clean,and renew light does not illuminate Poor ground connection or damage Inspect,clean,and tighten connections or wiring renew wiring Turn signal Faulty bulb Check and renew pilot light is Defective flasher unit Check and renew...
Page 216 Problems Causes Countermeasures Inoperative Burnt out fuse Inspect and renew.Check circuit before re- horn connecting power Loose or broken wires of Inspect circuit,tighten connections,or renew connections wiring Defective horn switch Check and renew Defective horn Check and renew 3.GLOW SYSTEM Problems Causes Countermeasures...
Page 217 4. STARTING SYSTEM Problems Causes Countermeasures Starter motor Discharged battery Check battery and charge or renew does not spin Defective stop light switch Check and renew Defective key switch Check and renew Defective starter motor connections Check,clean and tighten connections or loose battery connections Faulty starter motor Inspect,repair,or renew...
Page 218 Problems Causes Countermeasures Intermittent Alternator drive belt is slipping Check and adjust belt tension or renew or low Loose connection or broken cable in Inspect system,tighten connections and alternator charge system repair or renew faulty wiring output Defective alternator Check and repair or renew Warning light Faulty external charging circuit Inspect system,clean and tighten...
Page 219 CHAPTER 11. Service standards and other information SECTION 1. SERVICE STANDARDS --------------------------- 11-1 1.Engine accessories --------------------------------------------- 11-1 2.Main Clutch -------------------------------------------------------- 11-2 3.Transmission --------------------------------------------------- 11-3 4.Front axle -------------------------------------------------------- 11-5 5.Rear Axle -------------------------------------------------------------- 11-6 6.Power steering system ---------------------------------------------- 11-6 7.Hydraulic system ---------------------------------------------------- 11-6 8.Electrical equipment ------------------------------------------------ 11-9...
Page 220: Section 1. Service Standards
CHAPTER 11. Service standards and other information SECTION 1. SERVICE STANDARDS. Part names and Nominal Standard value Usable limits Service instructions inspection items dimensions for reassembly and remarks 1.ENGINE ACCESSORIES(CHAPTER 3) 1) RADIATOR 4.3 ℓ Coolant capacity Radiator alone 9.5 ℓ Whole cooling system ±0.15㎏f·㎠...
Page 221: Main Clutch
Part names and Nominal Standard value Usable limits Service instructions inspection items dimensions for reassembly and remarks 2. MAIN CLUTCH (CHAPTER 4) 5.8 ㎜ 8.6±0.3㎜ Rivet head depression CLUTCH DISC should maintained at (0.339 in) (0.228 in) ASSEMBLY more than 0.2 ㎜ At 650 kgf (Dry single plate) Facing wear...
Page 222: Transmission
Part names and Nominal Standard value Usable limits Service instructions inspection items dimensions for reassembly and remarks 3. TRANSMISSION (CHAPTER 5) 1) FRONT AND SPACER TRANSMISSIONS 43 ℓ TRANSMISSION OIL CAPACITY SHIFTER DISENGAGING LOAD 18 - 22 ㎏f 17 ㎏f Measured at the shifters Main shift (both for synchromesh...
Page 223 Part names and Nominal Standard value Usable limits Service instructions inspection items dimensions for reassembly and remarks 2) REAR TRANSMISSION (1) DRIVE PINION & RING GEAR 0.11-0.13 ㎏f·m Starting torque 0.1 ∼ 0.2 ㎜ 0.5 ㎜ Backlash Backlash and tooth bearing should be adjusted properly when reassembled...
Page 224 Part names and Nominal Standard value Usable limits Service instructions inspection items dimensions for reassembly and remarks 4. FRONT AXLE (CHAPTER 6) 1) Front drive axle (4WD) Front : 2.4 ㎏f/㎠ Tire inflation Rear : 1.6 ㎏f/㎠ ①Toe-in : 0 ~5 ㎜ Wheel alignment ②Camber : 2°...
Page 225: Rear Axle
Part names and Nominal Standard value Usable limits Service instructions inspection items dimensions for reassembly and remarks 5.REAR AXLE (CHAPTER 7) 1) DISK BRAKE 3.4 ± 0.15 ㎜ 3.2 ㎜ FRICTION PLATE THICKNESS (WEAR AND CARBONIZER ) 2) SEPARATE PLATE 2.5 ±...
Page 226 Usable limits Service instructions inspection items dimensions for reassembly and remarks 2) Dynamic lift 1,964 ㎏f T723 3) Cylinder case bush 55 ×55 ×40 Ø 50 ㎜ Ø 50.2 ㎜ Wear limit: 0.2 ㎜ Left side 50 ×55 ×40 Ø 50 ㎜...
Page 227 Part names and Nominal Standard value for Usable Service instructions inspection items dimensions reassembly limits and remarks 6) SLOW RETURN CHECK VALVE(Flow control valve) 280 ㎏f/㎠(3982 psi) Maximum Gear oil pressure SAE #80 ∼ #90 at a temperature of 50 ± 1 ㏄/min.at a pressure of 90 ㎏f/㎠...
Page 228: Electrical Equipment
8.ELECTRICAL EQUIPMENT 1)BATTERY (1) BATTERY TERMINAL POST Terminal voltage 12 V 10.8 V Charge or replace Corrosion Repair or replace (2) BATTERY CELLS Damage Replace battery (3) ELECTROLITE Cloudy fluid Replace battery Specific gravity 1.24 - 1.26 Correct Level As specified on Replace with distilled case water.
Page 229 (3) Turn signal switch Replace a defective ●Turn signal switch switch assembly. (4) Horn switch Replace a defective ●Horn switch switch assembly. (5) PTO SWITCH Continuity across Switched on when lever is moved by about 3 mm Replace a defective each terminal (0.12 in) across R and LR switch assembly.
Page 230 SECTION 2.TIGHTENING AND STARTING TORQUE SPECIFIED FOR MAJOR PARTS 1. T723 TIGHTENING PARTS Bolt and Nut Tightening torque (Hardness) (㎏f·m) 1)Front axle housing (4WD type) ① Axle bracket ∼ Engine tightening bolts 16.0 ∼ 18.0 5/8-11UNC (9T) ② Front pivot metal(support)tightening bolts 16.0 ∼...
Page 231 CHAPTER 12. CABIN SECTION 1. GENERAL DESCRIPTION ----------------------------- 12-1 SECTION 2. PRECAUTIONS FOR CABIN OPERATION-------- 12-2 SECTION 3. CONTROLS------------------------------------------------- 12-4 SECTION 4. HEATING SYSTEM-------------------------------------- 12-6 SECTION 5. AIR CONDITIONING SYSTEM------------------------ 12-9 SECTION 6. CABIN WIRING INSTRUCTION DIAGRAM----- 12-18 SECTION 7. CABIN WIRING DIAGRAM -------------------------- 12-19...
Page 232: Section 1.General Description
CHAPTER 12. Cabin Section 1.General description The cab fully conforms to the international standard as far as safety and soundproofing are concerned. It can be provided with ventilation, heating and air-conditioning system. It is available in the following version.: ● Cab with ventilation and heating systems ●...
Page 233: Section 2.Precautions For Cabin Operation
Section 2.Precautions for cabin operation 1.Instruments and related parts. 1) Doors: The doors are provided with key locks. To open from the outside, when unlocked, depress the push button. To open from inside, push the lever downwards. Fig.12-2 2) Rear Window: The rear window is fitted with central handle for opening.
Page 234 Remember that steering, braking and operational performances are highly influenced by the implements mounted, the trailers transported and the ballasts Caution applied to the tractor. When transporting heavy loads (exceeding the weight of the tractor) reduce the speed under 15 Km/h. Caution All the implements mounted onto the tractor must be safely secured.
Page 235: Section 3. Controls
Section 3. CONTROLS Fig.12-8 1) Working lamp Switch The front and rear work lights are ON when push the button .The work light indicator lamp on the instrument cluster will illuminate. 2) Wiper and Washer control switch(Front and Rear) ON SWITCH: -Wind screen wiper operation -Washer pump operation.
Page 236 5) Circulation diffuses With the circulation vent set in any position outside Air will still be pulled into the cab. VENTILATION Fig.12-11 The ventilation unit is housed in the cab ceiling. To switch it on and adjust it, turn the electrical fan switch to the desired speed. The cab becomes slightly pressurized when the ventilation system is in operation, so that the fresh air can enter only by way of the filter installed in the rear section of the cab roof.
Page 237: Section 4.Heating System
Section 4.Heating system General description The heater is switched on and adjusted by rotating the control knob at the roof console, then switching on the blower and setting the selector at the preferred speed . To warn the cab up quickly, the knob should be rotated fully clockwise and the blower set to speed 3. The screen is demisted or defrosted by air directed through a slot vent .
Page 238 SYSTEM CONFIGULATION 1.The heating system consist of two units: 1-Electric heater and blower unit installed behind roof console. 2-Power supplying set, consisting of an auxiliary alternator located front of the engine and driven by a belt directly linked to the engine pulley. If the air does not come out from the diffusers right away as soon as the system is started, turn off immediately and identify the fault.
Page 239 Section 5.Air conditioner system The system is designed to ensure optimum temperature inside the cab and maximum comfort and safety for the operator. However, it is advisable to consult our specialized workshops whenever repairs or adjustments need to be performed. Do not approach the system with open flames, as any escape from the circuit may produce a lethal gas.
Page 240 1.SAFETY PROCEDURES. This safety alert symbol indicates important safety messages in this manual. when you see this symbol, carefully read the message that follows and be alert to the possibility of personal injury or death Warning Refrigerant R134a is the most stable and easiest to 3.Keep refrigerant containers in the correct work with refrigerants now in use in air conditioner upright position.
Page 241 2. OPERATION The air conditioner system contains five major components: Compressor, receiver drier, expansion valve and evaporator. These components are connected by tubes and hoses and operate as a closed system. The air conditioner system is charged with R-134a refrigerant.. The compressor receives the refrigerant as a low pressure gas.
Page 242 3. Checking the air conditioning system. ①Economic friendly refrigerant : R134a 0.7∼0.85Kg. The presence of air and water in the system could jeopardize its efficiency. -The air is uselessly compressed by the compressor and no cooling effect is produced. -The moisture has a tendency rise to obstructions which prevent the cooling efficiency. ②...
Page 243 Bubbles or foam visible Trouble shoot ●No bubble shown ●Too much of refrigerant deflate. Abnormal ●High pressure pipe is not High-pressure pipe is hot abnormally. abnormal ● H.L pressure of the pressure H-L pressure of the pressure gauge needle gauge needle indicates high indicates high pressure abnormally.
Page 244 SYMPTOM CONDITION CAUSE REMEDY 2.Motor Weak from Motor is normal Air inlet clogged Remove pressure or Evaporator freezing Controlling don”t work minimum pressure Ventilator switch Replace the switch damage Compressor Replace Motor is abnormal Motor failure Replace Wire cut Replace Air leakage Duct leakage Check,tighten...
Page 245 1.Normal ⓐ Pressure • Low pressure : 1.5~2.0 kg/㎠ • High pressure: 14.5~15.0 kg/㎠ ⓑ Estimate • Refrigerant condition good •Air conditioning good • Normal air conditioning system 2. Deficient of Refrigerant Gas ● Low pressure : 0.8 kg/㎠(Low) ⓐ Pressure ●...
Page 246: Section 5. Air Conditioning System
4.mixed Air in the air conditioning system ●Low pressure : 2.5 kg/㎠(High) ⓐ Pressure ●High pressure: 23 kg/㎠(High) ● Deficient of cooling condition ⓑ Situation (Not cool) ● Not cool when touch the low pipe ●Air was mixed in the air conditioning ⓒ...
Page 247 6.Refrigerant doesn’t circulate in the Air conditioning system ●Low pressure : Negative pressure(Low) ⓐ Pressure ●High pressure: 6 kg/㎠(Low) ● Deficient air conditioning ⓑ Situation (Not cool) ● Cool occasionally ●Clogged in the Expansion valve hole ⓒ Cause (Clogged by foreign matter or freezing, dust) ●Clogged in the expansion valve ⓓ...
Page 248: Section 6. Cabin Wiring Instruction Diagram
Section 6. WIRING CABIN WIRING INSTRUCTION DIAGRAM Fig.12-19 12-18...
Page 249: Section 7. Cabin Wiring Diagram
CABIN WIRING DIAGRAM Fig.12-20 12-19...
Page 250 CHAPTER 13. CONVERSION TABLES...
Page 251 SECTION 1. CONVERSION TABLES M illimeters to inches Inches to millimete rs 0.0394 1.0236 2.0079 2.9921 1/64 0.3969 25/64 9.9219 13/16 20.6375 0.0787 1.0630 2.0472 3.0315 1/32 0.7938 13/32 10.3188 53/64 21.0344 0.1181 1.1024 2.0866 3.0709 3/64 1.1906 27/64 10.7156 27/32 21.4313 0.1575...
Page 252 L e ngth Fe e t to M e te rs 0.0000 0.3050 0.6100 0.9150 1.2200 1.5250 1.8300 2.1350 2.4400 2.7450 8.0532 3.3550 3.6600 3.9650 4.2700 4.5750 4.8800 5.1850 5.4900 5.7950 21.1097 6.4050 6.7100 7.0150 7.3200 7.6250 7.9300 8.2350 8.5400 8.8450 34.1661 9.4550...
Page 253 Are a S qu are i nc h e s to s qu are c e nti me te rs 0.000 6.462 12.924 19.386 25.848 32.310 38.772 45.234 51.696 58.158 64.620 71.082 77.544 84.006 90.468 96.930 103.392 109.854 116.316 122.778 129.240 135.702 142.164...
Page 254 V ol u me Gal lons ( U.S ) to L i te rs US gal US gal Liters Liters Liters Liters Liters Liters Liters Liters Liters Liters 0.000 3.785 7.571 11.356 15.142 18.927 22.712 26.498 30.283 34.069 37.854 41.639 45.425 49.210 52.996...
Page 255 M AS S P ou n ds to Ki l ogr ams 0.000 0.454 0.907 1.361 1.814 2.268 2.722 3.175 3.629 4.082 4.536 4.990 5.443 5.897 6.350 6.804 7.258 7.711 8.165 8.618 9.072 9.526 9.979 10.433 10.886 11.340 11.794 12.247 12.701 13.154 13.608...
Page 256 P r e s s u re P ou nds pe r s qu are i nc h e s to Ki l ograms pe r s qu are c e n ti me te rs b/in2(PSI) lb/in2(PSI) Kg/cm2 Kg/cm2 Kg/cm2 Kg/cm2 Kg/cm2...
Page 257 Torqu e Foot pou nds to Ki l ogram me te rs ft lbs Kg-m Kg-m Kg-m Kg-m Kg-m Kg-m Kg-m Kg-m Kg-m Kg-m 0.138 0.276 0.414 0.552 0.690 0.828 0.966 1.104 1.242 1.380 1.518 1.656 1.794 1.932 2.070 2.208 2.346 2.484 2.622...
Page 258 Temperature Fahrenheit to Centigrade Centigrade to Fahrenheit ˚F ˚C ˚F ˚C ˚C ˚F ˚C ˚F -28.9 35.0 -22.0 96.8 -26.1 37.8 -18.4 100.4 -23.3 40.6 -14.8 104.0 -20.6 43.3 -11.2 107.6 -17.8 46.1 -7.6 111.2 -17.2 48.9 -4.0 114.8 -16.7 51.7 -0.4 118.4...
Page 259 T723 Service Manual for Tractor Code No. 1733-960-001-0 Printed on September 2009 1st Edition...

TYM T723 Service Manual

Chapter 2 Disassembly and Reassembly of Major Components

Chapter 3 Engine Accessories

Chapter 4 Clutch System

Chapter 5 Transmission

Section 5

Section 6

Chapter 8 Power Assisted Steering System

Chapter 9 Hydraulic System

Chapter 10 Electrical Accessory and Instruments

Chapter 11. Service Standards and Other Information

Chapter 12. Cabin

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