Setting the running-in procedure, service intervals, and daily checks for four Ford 40 Series tractors, this Ford 6640 operator manual PDF (OEM 42564031, 124 pages) is the book the factory put in the cab, from the 5640 to the 7840. Roughly a quarter of the book is lubrication and maintenance, stepping from 10 hour coolant and oil checks out to the 1200 hour transmission and rear axle oil change. Warning lights, Dual Power shifting, remote valve hookup, wheel track adjustment, and ballast limits each get their own sections, and the specification chapter lets you look up tire pressures and loads by size. Fill a four cylinder engine with 12.1 U.S. quarts of oil (the 7840's six takes 22.1) and torque the ROPS mounting bolts to 200 lbf.ft. Hay down, rain coming, no time to hunt one number. Bookmarked and searchable by keyword, this PDF gets the parts order right the first time and you back in the field.
What's Inside This Ford 5640, 6640, 7740, 7840 S Range Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5 | |
| Owner Assistance | 6 | Service Department, Service Publications Catalog |
| Safety Precautions | 7-10 | The Tractor, Operating the Tractor, Operating the P.T.O, Diesel Fuel |
| Safety Decals | 11 | Battery Decal |
| Roll Over Protection System (ROPS) | 12 | Mounting Bolts, Seat Belt, Operator's Seat |
| Warranty and Limitation of Liability | 13-16 | Basic Warranty, Extended Power Train Warranty, Engine Components, Transmission Components, Rear Axle Components |
| Pre-Delivery Inspection | 17-20 | Tire Pressure, Radiator Coolant, Engine Oil, Hydraulic System, Brake Adjustment, Electrical Cables |
| First 50 Hour Service | 21-23 | Air Cleaner, Fuel Filter, Engine Oil, Hydraulic Filter, Front Axle Differential Oil, Valve Clearance |
| Universal Symbols | 24 | Fuel Level |
| Controls, Instruments and Operation | 25-70 | Operator's Seat and Seat Belt, Instrument Panel - Gauges and Warning Lights, Starting the Engine, Parking Brake Latch, Hand Throttle and Foot Controls, Transmission and Dual Power |
| Lubrication and Maintenance | 71-102 | Diesel Fuel, Access Panels, Lubrication and Maintenance Chart |
| Tractor Specification | 103-124 | General Dimensions, Tractor Weight, Engine, Hydraulic System, Electrical Equipment, Capacities, Lubricants, Tire Pressures and Loads |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Steering/hydraulic intake filter service interval | within 1 hour of operation | p. 28 |
| Hydraulic filter tightening | 3/4 of a turn after faces meet | p. 86 |
| ROPS mounting bolt torque | 200 lbf.ft (271 Nm) | p. 85 |
| Disc to hub nuts torque | 350 lbf.ft (475 Nm) | p. 60 |
| Disc to rim nuts torque | 177 lbf.ft (240 Nm) | p. 60 |
| Clutch pedal free play | 1.1 - 1.6 in. (28 - 41 mm) | p. 78 |
| Front axle oil capacity (FWD) | 6.6 U.S. quarts (6.2 liters) | p. 93 |
| Front hub oil capacity (FWD, each) | 3.2 U.S. quarts (3.0 liters) | p. 93 |
| 5640, 6640, 7740 | ||
| Engine oil capacity (4-cylinder) | 12.1 U.S. quarts (11.4 liters) | p. 85 |
| Cooling system capacity (4-cylinder) | 4.2 U.S. gallons (16.0 liters) | p. 97 |
| 7840 | ||
| Engine oil capacity (6-cylinder) | 22.1 U.S. quarts (20.9 liters) | p. 85 |
| Cooling system capacity (6-cylinder) | 5.7 U.S. gallons (21.5 liters) | p. 97 |
Ford 5640, 6640, 7740, 7840 S Range Common Problems This Manual Covers
Ford 7840 three-point hitch lifts slowly and remote hydraulics feel weak at full throttle
Check transmission and rear axle oil level first; low oil starves the lift pump. Replace the hydraulic filters, tightening each new element 3/4 of a turn after the faces meet as shown on page 86. Have your dealer verify relief pressure against the 2550 to 2650 psi (176 to 182 bar) spec on page 107 before you blame the pump.
Manual Section: Hydraulic System Operation p. 86Gears grind going into range or shuttle when the tractor is cold
Measure clutch pedal free play; it should be 1.1 to 1.6 in. (28 to 41 mm), and the adjustment procedure is on page 78. Too little free play keeps the clutch from releasing fully and the gears grind. Let the engine warm at low idle for a few minutes in winter so the transmission oil thins out before you shift.
Manual Section: Transmission and Dual Power p. 78PTO will not engage or slows and stalls under load partway through the field
Verify the full engagement sequence in the controls section starting on page 25: operator seated, engine at low idle, then flip the PTO switch. If engagement stays weak, complete the 50 hour service on page 21 so fresh oil and a new hydraulic filter reach the PTO clutch, then have your dealer test the switch and wiring.
Manual Section: Controls, Instruments and Operation p. 25Temperature gauge climbs into the red during heavy tillage on hot afternoons
Clean chaff out of the radiator and grille screens with low pressure air, blowing from the engine side out. Check coolant level cold at the recovery tank. If you drain and refill, the system holds 4.2 U.S. gallons (16.0 liters) on the 5640, 6640 and 7740 per page 97; the 7840 takes more, so check that page for your model.
Manual Section: Cooling System Maintenance p. 97Front drive axle whines or hubs run hot after long road transport
Check the front axle differential and both hub oil levels at their plugs with the tractor parked on level ground. The FWD axle housing holds 6.6 U.S. quarts (6.2 liters) and each hub holds 3.2 U.S. quarts (3.0 liters); the fill procedure is on page 93. Top up with the specified gear oil and check the hub seals for leaks.
Manual Section: Steering and Front Axle Maintenance p. 93Clicking or wobble from a wheel after resetting wheel track for row crop work
Check every wheel nut before the next road trip. Torque disc to hub nuts to 350 lbf.ft (475 Nm) and disc to rim nuts to 177 lbf.ft (240 Nm) per page 60. Recheck after the first few hours of work; nuts loosen fastest right after a wheel has been off.
Manual Section: Steering and Front Axle Maintenance p. 60Frequently Asked Questions
What is the torque specification for the ROPS mounting bolts on a Ford 5640, 6640, 7740, 7840 Tractor?
The ROPS mounting bolts should be tightened to a torque of 200 lbf.ft (271 Nm). p. 85
What is the correct valve clearance for the Ford 5640, 6640, 7740, 7840 tractor engine?
The correct valve clearance for all models is 0.014 - 0.018 in. (0.36 - 0.46 mm) for the inlet and 0.017 - 0.021 in. (0.43 - 0.53 mm) for the exhaust. p. 89
What is the engine oil capacity for a 4-cylinder engine including the filter?
The engine oil capacity for 4-cylinder engines, including the filter, is 12.1 U.S. quarts or 20.1 Imp. pints (11.4 liters). p. 85
What is the recommended torque for the rear disc to hub nuts on manual adjust wheels?
The rear disc to hub nuts on manual adjust wheels should be tightened to 288 lbf.ft. (390 Nm). p. 79
How often should the engine oil and filter be changed under normal conditions?
The engine oil and filter should be changed every 300 hours of operation. p. 84
Is this Ford 5640 manual a PDF I download?
You get a 124-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Am I free to print this Ford 5640 Operator Manual?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
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