John Deere 4475, 5575, 6675 & 7775 Skid Steer Loader Technical Manual, 1993–2001 (P/N TM1553)

The April 1995 John Deere Technical Manual (P/N TM1553) covers the 4475, 5575, 6675, and 7775 skid steer loaders from serial 010001 onward.

PDF Bookmarks and Wiring Detail

Finding sections and tracing wires: Embedded bookmarks open the main sections and the alphabetical index. Standard word searches are unavailable. Small connector pin numbers and wire-color codes in the wiring diagrams are easier to read at higher zoom.

The ZIP download contains one printable PDF with 433 pages, including the original cover, introduction, four notes pages, and four-page index.

Engine, Drive, and Loader System Repairs

This selection of service topics also includes fuel shutoff solenoid diagnosis and radiator cap pressure testing.

• Diesel engine: Compression and injector nozzle testing, injection pump timing, valve adjustment, engine removal, and internal repair.

• Gear drive and parking brake: Drive axle, sprocket, and chain-case service, reduction gearbox repair, and parking brake linkage, pad, and caliper work.

• Hydrostatic drive: Pump and motor efficiency checks, case-drain and case-pressure tests, high-pressure relief testing, and pump and motor disassembly, inspection, and reassembly.

• Loader hydraulics: Pressure and flow testing, boom and bucket drift checks, lockout solenoid testing, and lift and bucket cylinder repair.

• Electrical diagnosis: Circuit diagrams and test procedures for cranking, charging, manual and automatic preheat, warning circuits, lighting, and the electronic instrument panel.

• Steering and shop access: Steering centering adjustment and linkage repair, model-specific cab and boom tilting, boom-lock diagnosis, Quick-Attach repair, and jacking and cribbing.

• Backhoe hydraulics: Boom, dipperstick, stabilizer, and swing circuits, with control valve and cylinder repair, crossover relief service, and coverage of the 911 dipperstick extension.

John Deere wrote this manual for experienced service technicians.

Engine Builds and Overhaul

The engine specifications are grouped by build: 3015D001 (3TNE84) for the 4475, 3017D001 (3TNE88) for the 5575, 4020D001 (4TNE84) for the 6675, and 4022D001 (4TNE88) for the 7775. Step-by-step procedures cover engine removal with or without tilting the cab and internal work on the cylinder head, valves, pistons, connecting rods, block, crankshaft, bearings, flywheel, camshaft, and timing gears.

The engine section covers cooling and lubrication diagnosis, water pump and oil pump service, and injection equipment repair. The electrical section provides starter and alternator repair procedures.

Chain Drive and Hydrostatic Service

The 4475 and 5575 use an intermediate drive shaft and separate final-drive chains. The 6675 and 7775 use individual reduction gearboxes ahead of the chain drives. Model-specific instructions cover chain tension, axle end play, and drive component replacement.

The Hydrostatic System Schematic supports diagnosis alongside the separate EATON pump and motor repair procedures. The 6675 and 7775 have a dedicated motor shimming procedure. The manual warns that incorrect flex-plate orientation can damage the hydrostatic pump seal and that startup without adequate charge pressure can damage the pumps and motors.

Loader Cylinders and Backhoe Circuits

On the 6675 from serial 10449 and the 7775 from serial 10326, the bucket cylinders changed from solid to counterbored pistons. The serial breaks help identify which parts belong together before rebuilding either cylinder. Mixing piston parts within a cylinder or pairing different cylinder designs can damage the cylinders and attachments. The 4475 and 5575 lift cylinder procedures distinguish earlier threaded heads from later retaining-ring heads.

The Hydraulic System Schematic shows the EATON 25300 B2 charge pump and 34673-AAC main control valve. The backhoe section focuses on hydraulic diagnosis and repair for the 800, 900, and 911. Its Backhoe Hydraulic System Schematic is supplemented by separate boom-swing layouts for the 800 and for the 900 and 911.

Circuit Tracing and Workshop References

The Electrical Schematic and Wiring Harness views help trace connector pins, grounds, switches, and relays. The boom and bucket lockout diagnosis follows the seat and seat belt inputs through the instrument panel to the solenoids, helping distinguish an input fault from a solenoid fault. The Brake System Exploded View shows the parking brake components and their arrangement.

Workshop references include torque tables, approved lubricants, fluid capacities, wear limits, and adjustment data. Tool references include the JDE118 Valve Guide Driver, D15001NU Magnetic Follower Holder Kit, JDF13 Nozzle Cleaning Kit, D01074AA Hydraulic Tester, and MG9862308 Cab Jack Kit. The manual describes machine support, boom locking, and pressure relief for raised-boom work, cab tilting, and hydraulic tests.

Valve Clearance and Fuel Sender Test Examples

For the four diesel builds, the cold intake and exhaust valve adjustment target is 0.20 mm (0.008 in.). The valve diagrams show which valves are checked at each specified top-dead-center position for the three- and four-cylinder engines.

The electrical specifications list fuel level sender resistance at 35 ohms with a full tank and 240 ohms with an empty tank. Those readings give technicians reference points when diagnosing an incorrect fuel level display.