Part of the John Deere Repair Manuals.
This is the factory John Deere Technical Manual for one machine, the JD302-A Loader and Backhoe Loader, OEM TM-1090, 558 pages running from basic engine work through the 9250 backhoe control valve. Factory wiring diagrams cover the charging, starting, and ignition circuits. Hydraulic schematics trace fluid from the main pump through the loader, steering, brake, and backhoe valves. A full System Testing section handles engine, electrical, power train, and hydraulic faults. Torque the wheel retainers to 100 lb-ft, set pump shaft end play between 0.002 and 0.006 inch, and pull the rocker arm shaft clamp screws to 55 lb-ft (75 Nm). Forum threads won't rebuild your reverser. Bookmarked by system and text-searchable: type the spec, find the number, put a wrench on it.
What's Inside This John Deere JD302-A Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 4-10 | FOS Manuals, Technical Manuals, Service Procedures, Specifications, System Operation, Diagnosis |
| General | 11-48 | General Machine Specifications, Predelivery, Delivery, And After-Sale Services, Lubricants |
| Engine | 49-128 | Engine Removal and Installation, Basic Engine, Engine Lubricating System, Engine Cooling System, Fuel System, Speed Control Linkage, Air Intake System |
| Electrical System | 129-182 | Batteries, Charging System, Starting System, Ignition System, Gauges and Switches, Specifications and Special Tools |
| Power Train | 183-236 | Clutch Assemblies, Transmission, Reverser, Continuous Running PTO, Differential and Parking Brake, Final Drives, Specifications and Torque Values |
| Hydraulic System | 237-380 | Transmission Pump, Main Hydraulic Pump, Reverser Clutch Control Valve, Pressure Control Valve, Power Steering Valve, Brake Valve, Loader Control Valve, 9250 Backhoe Control Valve |
| Miscellaneous | 381-418 | Front End Assembly, Loader Frame, Boom, And Bucket, 9250 Backhoe Frame, Dipperstick |
| System Testing | 419-552 | Diagnosis and Testing, Engine Testing, Electrical System Testing, Power Train Testing, Hydraulic System Testing, Hydraulic Analyzer Tests, Specifications and Special Tools |
| Index | 553-556 | Alphabetical Index |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wheel retainer torque | 100 lb-ft | p. 44 |
| Tie rod clamp cap screw torque | 40 lb-ft | p. 45 |
| Pump shaft end play | 0.002 to 0.006 in. | p. 242 |
| Pump piston spring length | 1.62 in. | p. 243 |
| Discharge valve seat installation force | 850 pounds | p. 244 |
| Clutch control valve spring (8, Fig. 2) free length | 1.63 in. | p. 250 |
| Clutch control valve spring (8, Fig. 2) test length | 1.12 in. | p. 250 |
| lift check spring test | 0.5 in. with 0.75 pounds | p. 270 |
| Flow control valve stop pin exposed length | 0.9375 in. | p. 301 |
| Transmission-hydraulic filter relief valve spring free length | 2.56 in. (65.02 mm) | p. 319 |
| Transmission-hydraulic filter relief valve spring test length | 1.31 in. (33.27 mm) | p. 319 |
| Transmission pump relief valve spring free length | 1.87 in. (47.50 mm) | p. 322 |
John Deere JD302-A Common Problems This Manual Covers
John Deere JD302-A loader moves slowly, lacks lifting power, bucket will not lift a heavy load
Check transmission and hydraulic oil level first; the system holds 10 gallons (37.9 L). Test main pump standby pressure with an analyzer; if it reads outside 2300 to 2400 psi on page 246, adjust the stroke control valve screw. If pressure is correct, run the Circuit Leakage Test on page 516 to isolate leakage in the loader control valve.
Manual Section: Hydraulic System p. 246Loader boom settles down from raised position with engine running or shut off
Raise the boom, shut off the engine, and watch for drift; that isolates internal cylinder leakage. Repack leaking boom cylinders with new seals, then tighten the lock nut to 150-250 lb-ft (21-35 kg/m) per page 331. If cylinders test tight, inspect the loader control valve and selective control valve for internal leakage; the symptom chart on page 505 routes both to the Circuit Leakage Test.
Manual Section: Hydraulic System p. 331Loader moves opposite to control lever after hose replacement or attachment swap
Trace each hose from the loader control valve to its cylinder port before condemning the valve. Reversed connections at the quick-connect couplers flip lever response. Reconnect the hoses in correct order, cycle each function slowly, and verify system relief pressure does not exceed the 2350 psi (16 203 kPa) maximum before returning to work.
Manual Section: Hydraulic System p. 11Hydraulic oil overheats and functions get sluggish after an hour of digging
Drain and refill with clean fluid if the oil is dark or smells burnt; capacity is 10 gallons (37.9 L). Clean the oil cooler grille and tank strainer. Inspect the transmission-hydraulic filter relief valve spring on page 319; replace it if free length is under 2.56 in. (65.02 mm), since a weak spring bypasses dirty oil past the filter.
Manual Section: Hydraulic System p. 319Oil leaks at loader fittings, couplers, and cylinder rods leave puddles under the machine
Wipe everything clean, run the loader, and find the wet spot before pulling parts. Replace O-rings on plug-in fittings and worn coupler seals. For leaking bucket cylinder rod seals, install a new seal kit, then torque the rod guide to 250-300 lb-ft (35-41 kg/m) and the stop nut to 150-250 lb-ft per page 330.
Manual Section: Hydraulic System p. 330Frequently Asked Questions
What is the torque specification for the cylinder head cap screws?
Tighten the cylinder head cap screws evenly to 95 lb-ft (13.1 kg-m), following the sequence shown in Figure 6. p. 57
What is the torque specification for the wheel retainers?
Wheel retainer torque gets checked and tightened to 100 lb-ft (14 kg/m). p. 26
What is the engine oil capacity for the JD302-A?
Engine lubrication system capacity, including the filter, is 9 quarts (8.5 liters). p. 12
What is the correct valve clearance for the intake valves?
Intake valve clearance is 0.014 inch (0.3556 mm) for both diesel and gasoline engines. p. 54
What is the correct engine speed for slow idle?
Slow idle engine speed is 825 rpm. p. 19
What format is this John Deere JD302-A manual in?
You download the Technical Manual yourself: 558 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Am I free to print this John Deere JD302-A Technical Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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