Part of the John Deere Repair Manuals.
Wrenching on the liquid-cooled FD engine in your LX178, LX188, 285, 320, or 425? This 117-page John Deere FD440–FD620 Series Technical Manual PDF (OEM #CTM39) breaks down the FD440V, 501V, 590V, and 620D from carburetor to crankshaft. You get separate repair specifications for each engine, metric torque tables, and step-by-step teardown procedures for the fuel system, governor, cylinder head, and cooling system. Open to the troubleshooting section for compression tests, crankcase vacuum tests, and oil pressure diagnosis, then check the component analysis chapter for wear limits on pistons, rings, and crankshaft. Torque the spark plugs to 17 N-m on the FD440V/501V and 20 N-m on the 590V and 620D, and reject any fuel pump push rod bent past 0.05 mm. No more chasing wear limits through forum threads. Bookmarked and readable on any device; find the spec, walk to the machine, fix it.
What's Inside This John Deere FD440V, FD501V, FD590V, FD620D Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3-5 | Fluids, Chemical Products, Waste Disposal, Service Procedures, Protective Clothing, Asbestos Dust |
| Specifications & Information | 6-27 | Basic Engine Specifications, Test & Adjustment Specifications, Repair Specifications, Metric Torque Values, Gasoline Specifications, Lubricant Specifications, Component Location |
| Intake,Exhaust & Breather | 28-31 | Air Cleaner, Intake Manifold, Muffler, Breather |
| Fuel System & Governor | 32-47 | Carburetor, Mechanical Fuel Pump, Governor, Fuel Injection System, Fuel Injector, Fuel Pressure Regulator |
| Cylinder Head & Valves | 48-53 | Cylinder Head, Head and Valve Components, Valve, Valve Seat, Valve Guide, Push Rod |
| Cylinder Block, Pistons & Rods | 54-67 | Crankcase Disassembly, Pistons, Crankshaft Plain Bearings, Cylinder Block, Piston Rings, Connecting Rod |
| Camshaft, Crankshaft & Flywheel | 68-73 | Camshaft Bearings, Camshaft, Tappets, Crankshaft, Flywheel |
| Lubrication System | 74-79 | Oil Pump, Oil Filter, Oil Pressure Relief Valve, Oil Pressure Switch, Oil Pick-Up Screen |
| Cooling System | 80-89 | Cooling System Operation, Thermostat, Coolant Pump, Cooling Fan, Fan Bracket, Fan Drive Belt |
| Electrical System | 90-99 | Stator, Ignition, Starter, Fuel Injection System, Pulser Coils, Ignition Coils |
| Troubleshooting | 100-109 | Starting Motor, Engine, Performance Diagnosis, Compression Test, Crankcase Vacuum Test, Oil Pressure Test |
| Component Analysis | 110-115 | Valves, Pistons, Ring Wear, Piston Wear, Crankshaft Wear, Connecting Rod Wear |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| FD440V/501V Fuel Pump Push Rod Maximum Bend | 0.05 mm (0.002 in.) | p. 11 |
| FD590V Fuel Pump Push Rod Maximum Bend | 0.05 mm (0.002 in.) | p. 12 |
| FD440V/501V Spark Plug Torque | 17 N•m (150 lb-in.) | p. 9 |
| FD590V Spark Plug Torque | 20 N•m (177 lb-in.) | p. 12 |
| FD440V/501V Water Pump Minimum Shaft O.D. | 9.94 mm (0.391 in.) | p. 13 |
| FD440V/501V Water Pump Maximum Pump and Crankcase Housing Bore I.D. | 10.09 mm (0.397 in.) | p. 13 |
| FD590V Thermostat Opening Temperature | 82°C (180°F) | p. 14 |
| FD590V Thermostat Fully Open Temperature | 95°C (203°F) | p. 14 |
| FD440V/501V Engine Coolant Capacity | 2.10 L (2.2 qt) | p. 13 |
| FD590V Engine Coolant Capacity | 3.04 L (3.2 qt) | p. 16 |
| Charging System Capacity (FD440/501/590V) | 15 Amps | p. 92 |
| Charging System Capacity (FD620D) | 20 Amps | p. 92 |
John Deere FD440V, FD501V, FD590V, FD620D Common Problems This Manual Covers
Coolant level dropping every few mows, white crusty residue around the water pump housing
Inspect the weep hole below the pump while the engine warms up; steady dripping there means the shaft seal is done. Measure the pump shaft and replace it below 9.94 mm (0.391 in.) O.D., or the housing if the bore exceeds 10.09 mm (0.397 in.). Torque pump cap screws to 8 N•m (70 lb-in.) per page 82.
Manual Section: Cooling System p. 82Starter cranks slowly and clicks in cold weather, dash lights dim when key is turned
Clean the battery terminals and load test the battery before condemning the starter; a corroded ground strap causes most slow-crank complaints. Test charging output next: back-probe the stator and look for 26 VAC at 3000 RPM per page 92. When bench testing the starter, hold to the duty cycle of 5 seconds on, 10 seconds off from page 108.
Manual Section: Electrical System p. 92Frequently Asked Questions
What is the torque specification for the FD590V flywheel nut?
The torque specification for the FD590V flywheel nut is 98 - 118 N•m (72 - 87 lb-ft). p. 14
How do you fix John Deere FD590V engine overheating at full load, coolant boiling out of the radiator overflow?
Check the cooling fins and rotating screen for packed grass clippings first; that fixes most overheating complaints. Test the thermostat in heated water: it should start opening at 82°C (180°F) and be fully open at 95°C (203°F) per page 14. After repairs, refill with 3.04 L (3.2 qt) of coolant per page 16. p. 80
How do you fix engine cranks but won't start after sitting all winter, strong fuel smell at the carburetor?
Drain the stale fuel and replace the fuel filter before touching anything else. Work through the carburetor troubleshooting chart on page 34 for hard-start and no-start conditions. If it still won't fire, run a compression test; readings below the 1171 kPa minimum on page 10 point to valve or ring problems. p. 34
How do you fix mechanical fuel pump leaking gas down the engine block, drips get worse when running?
Remove the pump and inspect the diaphragm and seals for cracks; replace them as a set, not one at a time. While the pump is off, roll the push rod on a flat surface and check for bend; anything over 0.05 mm (0.002 in.) means replace the rod. Reassembly procedures start on page 32. p. 32
How will I receive this John Deere FD440–FD620 Series Technical Manual?
You get a 117-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this John Deere FD440–FD620 Series manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
