Part of the John Deere Repair Manuals.
Need factory procedures for your JD350? This 520-page John Deere JD350 service manual covers both Crawler Tractors and Crawler Loaders, from basic engine teardown through the complete hydraulic system, direction reverser, steering clutches, track adjustment, and loader boom assembly. Inside you get wiring diagrams for the Motorola alternator, ignition system, and starters, hydraulic circuit diagrams for both the 15 GPM and 23 GPM pump configurations, exploded views across every major assembly, and a full troubleshooting section covering engine, clutch, and winch faults. Torque the 15 GPM pump assembly cap screws to 27-30 ft-lbs; set steering clutch composition facings to 0.175-0.181 inch before buttoning anything up. Your machine is down and every hour costs money. Bookmarked by section; search any spec by keyword and find it in seconds, not minutes.
What's Inside This John Deere JD350 Manual
| System | Pages | Key Topics |
|---|---|---|
| Description and Specifications | 7-14 | Engines, Lubrication System, Electrical System, Transmission, Track System, Winches |
| Tractor Separation | 15-25 | Engine Removal and Installation, Direction Reverser Case or Clutch Housing Removal and Installation, Final Drive Removal and Installation |
| Periodic Lubrication | 26-40 | Loader Removal and Installation, Lubrication Timetable |
| Engine Tune-Up and Tractor Adjustment | 41-70 | Engine Tune-Up, Detailed Tune-Up Procedure, Tractor Adjustment |
| Basic Engine | 71-112 | Cylinder Head, Valves, And Related Parts, Cylinder Block, Cylinder Liners, Pistons and Connecting Rods, Crankshaft |
| Engine Lubrication System | 113-120 | Oil Pump and Oil Filter |
| Governor and Speed Control Linkage | 121-128 | Governor, Speed Control Linkage |
| Engine Cooling System | 129-138 | Water Pump and Thermostat |
| Fuel Systems | 139-174 | Fuel Transfer Pump and Fuel Filters, Carburetor (Marvel-Schebler), Fuel Injection Pumps |
| Electrical System | 175-228 | Fundamentals of Alternator Charging Circuits, Electrical Tests on the Tractor, Alternator (Motorola), Ignition System (Gasoline Tractors), Starters, Battery, Wiring Diagrams |
| Engine Clutch | 229-236 | Engine Clutch Assembly, Engine Clutch Controls and Clutch Housing |
| Transmission | 237-264 | Description and Operation, Shifter Mechanism, Output Shaft and Ring Gear and Hub Assembly, Transmission Input Shaft, Powershaft and Transmission Case |
| Hydraulic Direction Reverser | 265-296 | Description and Operation, Servicing the Hydraulic Direction Reverser |
| Final Drives, Steering Clutches, and Brakes | 297-314 | Description and Adjustment, Final Drives, Steering Clutches and Brakes |
| Power Steering System | 315-326 | Description and Operation, Power Steering Cylinders |
| Track System | 327-338 | Description and Adjustment, Tracks |
| Special Service Tools | 339-352 | Engine Service Tool Set, Engine Cylinder Sleeve Puller Set, Diesel Injection Nozzle Removal and Installation Kit, Gasoline Carburetor Tools, Alternator Service Tool Set |
| Power Take-Off, Winch Drive, and Belt Pulley | 353-356 | Description and Operation, Power Take-Off, Winch Drive, Removal, Servicing and Assembly, Installation |
| No. 3315 Power Winch | 357-360 | Description and Operation |
| No. 3310 Manual Winch | 361-416 | Winch Hydraulic Pump, Control Valve and Filter, Winch Housing and Component Parts, Winch Control Valve and Accumulator |
| Hydraulic System | 417-466 | Hydraulic Pump (15 GPM), Hydraulic Pump (23 GPM), Loader Control Valve, Hydraulic Cylinders, Hydraulic Circuit Diagrams, Testing the Loader Hydraulic System, Hydraulic Components |
| Loader Main Frame, Boom, Buckets, and Hitches | 467-482 | Digging Bucket, Drott 4-In-1 Bucket, Point Hitch and Cylinders |
| Trouble Shooting | 483-520 | Engine and Engine Clutch, Winch |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic pump assembly cap screws torque (15 GPM PUMP) | 27 to 30 ft-lbs. | p. 429 |
| Hydraulic pump assembly cap screws torque (23 GPM PUMP) | 40 ft-lbs. | p. 429 |
| Drott Clam Circuit Relief setting | 2250 psi ( -600 ) or 2500 psi ( 601-up ) | p. 455 |
| Steering Clutch Composition Facings thickness (new parts) | 0.175 to 0.181 Inch | p. 313 |
| Steering Clutch Steel Plates thickness (new parts) | 0.090 to 0.096 Inch | p. 313 |
| Relationship between impeller fins and rim of pump housing | Flush within 0.010 inch | p. 137 |
| Maximum allowable piston ring side clearance in groove | 0.008 inch | p. 110 |
| Troubleshooting for Bucket lifts or closes too slowly | Insufficient engine speed, badly worn pump, oil leaking past control valve, oil leaking past cylinder packing, restriction in suction line, dirty relief valve, dirty wire mesh filter | p. 503 |
| Troubleshooting for Engine overheating with normal coolant levels | Dirty radiator core or grille screen, loose or defective alternator belt, cooling system limed up, defective temperature gauge, defective radiator pressure cap | p. 487 |
| Engine Flywheel Horsepower (observed) at 2500 rpm | 42.0 | p. 11 |
| Engine Crankcase Oil Capacity | 9 qts. | p. 12 |
John Deere JD350 Common Problems This Manual Covers
John Deere JD350 hydraulic pump whining or grinding, bucket lifts too slowly or not at all
Check the hydraulic troubleshooting chart on page 503. Verify engine speed is adequate, then inspect the wire mesh filter and suction line for restriction. If the pump is suspect, remove it and check for worn gears. On reassembly, torque the 15 GPM pump cap screws to 27 to 30 ft-lbs. (page 429).
Manual Section: Hydraulic System p. 503Engine overheats under heavy load, coolant level normal, temperature gauge climbing into red
Check the grille screen and radiator core first. Blow out dirt and insects with compressed air and straighten bent fins (page 58). Verify alternator belt deflection: a 20-lb. pull midway should deflect the belt 3/4-inch (page 51). If still overheating, pull the water pump and confirm impeller fins sit flush within 0.010 inch of the housing rim (page 137).
Manual Section: Engine Cooling System p. 487Steering clutch slips or fails to disengage on one side, crawler pulls hard
Inspect the steering clutch pack on both sides for worn or glazed discs. Remove the clutch assembly and measure composition facing thickness; new facings should be 0.175 to 0.181 inch thick and steel plates 0.090 to 0.096 inch per page 313. Replace any disc outside specification and check brake adjustment before reinstalling the covers.
Manual Section: Final Drives, Steering Clutches, and Brakes p. 313Engine won't fire after cranking, especially in cold weather, primer has no effect
Check the troubleshooting steps starting on page 485. Verify both fuel shut-off valves are open and the fuel filter is not clogged; drain any water from the sediment bowl. On gasoline models, check spark plug gap at 0.025-inch (page 49). Test battery voltage under load: a weak battery is a common cause of sluggish cranking and no-start.
Manual Section: Trouble Shooting p. 485Track throws off sprocket during turns or runs visibly loose on both sides
Measure track sag at the low point between the rear sprocket and track carrier roller; correct sag is 7/8 to 1-1/8 inches per page 351. Adjust track tension from the track system section starting on page 327. Check for grease leakage from the track adjuster and inspect idler alignment before operating again.
Manual Section: Track System p. 351Engine burning oil with blue exhaust smoke, oil level drops between service intervals
Remove the cylinder head and inspect piston rings for wear and side clearance. Maximum allowable ring side clearance in the groove is 0.008 inch per page 110; replace any rings that exceed this limit. Refill to the 9-qt. crankcase capacity (page 12) and torque cylinder head bolts to 110 ft-lbs. in sequence on reassembly (page 47).
Manual Section: Basic Engine p. 110Frequently Asked Questions
What are the torque specifications for John Deere JD350 starter bolts?
The torque specification for starter mounting cap screws is 35 ft-lbs. This information is found in the engine specifications section of the manual. p. 112
How to troubleshoot starter issues on John Deere JD350?
To troubleshoot starter issues, refer to the 'Trouble Shooting' section. For sluggish starter operation, possible remedies include servicing or replacing the starter (page 100-30), oiling bearings (page 40-10), or addressing excessive engine drag (page 30-5). If the starter will not operate, check if the starter safety switch is closed, battery charge, circuit resistance, ignition switch, or the starter itself (page 100-30). p. 497
What are the replacement specifications for Hydraulic pump assembly?
For the 15 GPM hydraulic pump, the minimum outside diameter of pump idler and drive shafts at the bearing area is 0.6850 in., and the minimum pump gear width is 1.1070 in. For the 23 GPM pump, these values are 0.8730 in. and 1.1660 in. respectively. The back plate gear surface should be flat within 0.0015 in. for both pump types. p. 429
What are the replacement specifications for Dozer blade relief valve?
For the Drott 4-in-1 Bucket, which can be used as a bulldozer, the circuit relief valve is set at 250 psi above the main relief pressure of the crawler loader hydraulic system. The correct relief setting is 2250 psi (on early model loaders with 2000 psi system relief) or 2500 psi (on late model loaders with 2250 psi system relief). p. 473
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