Part of the John Deere Repair Manuals.
This 596-page John Deere GX255, GX325, GX335, GX345 Technical Manual (OEM #TM1973) covers every Garden Tractor variant in one place, so you stop cross-referencing three books when your Kawasaki-powered mower won't move. Inside: complete wiring diagrams for starting, charging, and PTO circuits, plus hydraulic lift schematics that walk you through oil flow testing and control valve repair. You get full troubleshooting trees for each engine (FH531V, FH601V, FD611V), hydrostatic transaxle rebuild steps, and steering service broken out by model. Set fuel pump pressure to a minimum of 6.1 kPa (0.9 psi) and torque the fuel pump mounting cap screw to 17 N-m (150 lb-in), straight from the factory page. No more guessing whether your 335's steering valve or your 255's steering gear is the problem. Bookmarked by section, searchable by keyword; pull it up on your phone in the shop and get the tractor moving again.
What's Inside This John Deere GX255, GX325, GX335, GX345 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-10 | Recognize Safety Information, Handle Fluids Safely, Prevent Battery Explosions, Service Machines Safely, Use Proper Tools, Dispose of Waste Properly |
| Specifications and Information | 11-18 | Fastener Torques (Metric Fastener Torque Values, Inch Fastener Torque Values, Gasoline, Gasoline Storage, Engine Oil - North America, Engine Oil - Europe, Engine Break - in Oil, Hydrostatic Transmission Oil, Anti-Corrosion Grease, Alternative Lubricants, Synthetic Lubricants, Lubricant Storage, Mixing of Lubricants, Chassis Grease, Oil Filters) |
| Engine - Kawasaki (FH531V) | 19-68 | General Specifications, Torque Specifications, Engine Troubleshooting, Valve Clearance, Fuel Pump Test, Starting Motor Repair |
| Engine - Kawasaki (FH601V) | 69-130 | General Specifications, Torque Specifications, Choke Plate Adjustment, Crankcase Vacuum Test, Engine Removal, Carburetor Disassembly, Crankshaft Inspection |
| Engine - Kawasaki (FD611V) | 131-188 | General Specifications, Repair Specifications, Cylinder Leak-Down Test, Cooling System Pressure Test, Water Pump Removal, Piston and Connecting Rod |
| Electrical | 189-328 | Schematics and Harnesses, Starting Circuit Operation, Charging Circuit Diagnosis, PTO Circuit Operation, Battery Load Test, Connector Repair |
| Power Train - Hydrostatic | 329-432 | Hydrostatic Transaxle Specs, Neutral Creep Adjustment, Machine Will Not Move Diagnosis, Transaxle Disassembly, Brake Installation, Charge Pump Installation |
| Hydraulics | 433-454 | Hydraulic Lift System Operation, Excessive Attachment Drop Diagnosis, Hydraulic Lift Oil Flow Test, Hydraulic Lift Control Valve Repair, In-Line Filter Removal |
| Steering - 255 | 455-472 | Steering System Leakage Test, Steering Wheel Centering, Steering Gear Removal, Steering Control Unit Disassembly, Front Axle Component Location |
| Steering - 325 | 473-488 | Steering Wheel Freeplay, Steering Gearbox Operation, Steering Shimmies Diagnosis, Drag Link Adjustment, Toe-In Adjustment, Steering Gearbox Repair |
| Steering - 335/345 | 489-514 | Steering Valve and System Operation, Tilt Steering Operation, Steers Hard/No Steering Diagnosis, Steering System Leakage Test, Steering Cylinder Leakage Test |
| Brakes | 515-526 | Brake Pedal and Linkage, Transaxle Brake Operation, Parking Brake Does Not Hold Diagnosis, Brake Linkage Test, Brake Assembly Repair |
| Attachments | 527-564 | Mower Deck Adjustment Specs, PTO Clutch Diagnosis, Mower Level Side-to-Side, Electric PTO Clutch Adjustment, 48-Inch Deck Spindles, 54-Inch Jack Sheave |
| Miscellaneous | 565-596 | Hood Latch Adjustment, Lift Assist Spring Adjustment, Checking Wheel Bolt Torque, Front Axle Repair, Fuel Tank Removal, Attachment Lift (Foot Pedal) Removal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| FH531V engine | ||
| Fuel Pump Pressure (minimum) | 6.1 kPa (0.9 psi) | p. 23 |
| Fuel Pump Flow (minimum) | 65 ml/15 seconds (2.2 oz/15 seconds) | p. 23 |
| FH601V engine | ||
| Fuel Pump Pressure (minimum) | 6.12 kPa (0.90 psi) | p. 71 |
| FD611V engine | ||
| Fuel Pump Mounting Cap Screw Torque | 17 N•m (150 lb-in.) | p. 134 |
| Fuel Pump Push Rod Bend (maximum) | 0.05 mm (0.0002 in.) | p. 134 |
| All Models | ||
| Electric PTO Clutch Air Gap | 0.31 – 0.46 mm (0.012 – 0.018 in.) | p. 196 |
| Electric PTO Clutch Coil Resistance | 2.8 – 3.3 ohms | p. 196 |
John Deere GX255, GX325, GX335, GX345 Common Problems This Manual Covers
John Deere GX255 GX325 GX335 GX345 engine dies immediately after starting, only stays running with choke held out
Pull the fuel line at the carburetor and crank the engine; if flow is weak, test the fuel pump against the minimum output spec on page 23, which calls for 6.1 kPa (0.9 psi) and 65 ml per 15 seconds on FH531V-equipped engines. A pump below that flow is starving the carb once choke assist is removed. Replace the pump and inspect the quarter-inch fuel line for cracks before reassembly.
Manual Section: Engine - Kawasaki (FH531V) p. 23No spark at all, engine cranks over but flatly refuses to fire on any cylinder
Pull a plug and check gap against the 0.75 mm (0.030 in.) spec before chasing electrical gremlins; a closed or fouled gap reads as no spark on a tester. If gap is correct, trace the ignition circuit on the wiring diagram on page 196 and ohm out the off-time delay module (AM128906) for open windings. Replace the module if it shows infinite resistance and confirm the kill switch ground isn't shorted.
Manual Section: Electrical p. 196Mower deck randomly kicks out or won't hold engagement while cutting under load
Shut down and check PTO clutch air gap with a feeler gauge; spec on page 196 calls for 0.31 to 0.46 mm (0.012 to 0.018 in.). Gap that's grown out lets the clutch slip and overheat under load. Also ohm the clutch coil, looking for 2.8 to 3.3 ohms, and confirm amp draw sits near 4.0 amps at the connector; a low reading points to a burnt coil needing replacement.
Manual Section: Electrical p. 196Tractor bogs down or completely loses drive the moment you put it under load on a hill or in tall grass
Pop the belt cover and inspect the traction drive belt and tensioner spring for the correct part fitment on page 333; GX255 tensioner assemblies differ from the GX325, GX335, and GX345 setup, so match the model before ordering. A snapped belt or a tensioner spring that's lost tension will dump drive instantly under load. Replace the belt, reset tensioner arm travel, and run the machine empty before reloading it.
Manual Section: Power Train - Hydrostatic p. 333Engine surges or hunts at idle and won't hold a steady RPM under light load
Clean the cooling fins and shrouding first; trapped debris causes heat soak that makes the governor hunt. Check throttle and choke cable routing for binding, then work through the erratic-running steps in the engine troubleshooting section starting on page 26. When reinstalling the shroud hardware, torque the inch-series fasteners to 3.7 N·m (2.8 lb-ft) per page 14 so vibration doesn't loosen them again and reintroduce the surge.
Manual Section: Engine - Kawasaki (FH531V) p. 26Frequently Asked Questions
What are the recommended service intervals?
Service intervals vary by component. For the air cleaner, elements should be replaced yearly or every 25 hours. Spindle grease fittings and kingpins require lubrication every 25 hours under severe conditions or every 50 hours under normal conditions. Wheel bolt torque should be checked often during the first 100 hours of operation. p. 43
What fluids and capacities does this machine require?
The machine requires John Deere HY-GARD® - JDM J20C for hydrostatic transmission oil. Engine oil capacity is 1.6 L (1.7 qt) without a filter and 1.7 L (1.8 qt) with a filter. The hydrostatic transaxle oil capacity is 4.4 L (4.6 qt). p. 16
How to troubleshoot engine won't start?
To troubleshoot an engine that doesn't crank, first check if battery cables are loose or dirty and tighten/clean them. If the battery is not fully charged, charge it as described on page 312. Next, verify the key switch is working correctly, and if not, test and replace it. Finally, check if the engine has seized or if the starting motor or solenoid is defective, referring to the Engine Repair Section or page 316 for further tests. p. 30
What are the valve clearance specifications?
For the FH531V engine, the cold valve clearance specification is 0.075 - 0.125 mm (0.003 - 0.005 in.). This specification is critical for the valves to seat properly. p. 23
What torque specifications are listed?
Key torque specifications for the FH531V engine include the Engine Mounting Cap Screw Torque at 26 N·m (230 lb-in.), the Flywheel Bolt Torque at 56 N·m (41 lb-ft), and the Spark Plug Torque at 15 N·m (132 lb-in.). Always use an appropriate torque wrench and ensure fasteners are clean. p. 25
What format is this John Deere GX255–GX345 Series manual in?
A 596-page Technical Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is this John Deere GX255–GX345 Series Technical Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
