Part of the John Deere Repair Manuals.
Wrenching on a John Deere 6405 or 6605? This 720-page John Deere 6405, 6605 Service Manual PDF (OEM #TM4867) covers both tractors bumper to drawbar. You get factory wiring diagrams for the full electric system, hydraulic schematics with troubleshooting for the 100-liter pump and gear pump circuits, plus complete teardown procedures for the SyncroPlus and PowrQuad transmissions, PermaClutch II, Danfoss hydrostatic steering, brakes, front wheel drive clutch, PTO, and cab air conditioning. Trace a dead circuit with the multitester identification and harness connector maintenance sections, or run the preliminary hydraulic tests before you pull a single line. Diagnose and calibrate the hydraulic lift system straight from the diagnostic section, then check your work against factory test values and torque tables. Transmissions eating your weekend? Get the factory answer, not forum folklore. Bookmarked front to back; jump straight to the group you need and start wrenching.
What's Inside This John Deere 6405, 6605 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-6 | How to Use This Diagnosis and Tests Manual, Section Index, Special Tool References |
| Safety | 7-26 | Norms of Safety (Acknowledge the Safety Information, Observe the Safety Messages, Replace the Safety Stickers, Safe Handling of Liquids and Fuels, Avoiding the Explosion of Battery Gasses) |
| Electrical System | 27-127 | Special Tools for Electricity, Electric Harness Connector Maintenance, Multitester Identification, Source Circuit and Starting |
| SyncroPlus Transmission | 128-255 | SyncroPlus Transmission Troubleshooting, Tests and Regulations, Operation - SyncroPlus Transmission, PermaClutch Ii, Gearbox |
| PowrQuad Transmission | 256-390 | Operation, Troubleshooting, Regulating the Gearshift Unit, Operation - PowrQuad Transmission |
| Power Transmission | 391-429 | Front Wheel Drive Clutch, Diagnosis of the FWD, Differential Lock and PTO |
| Steering and Brakes | 430-478 | Operation and Tests, Troubleshooting, Checking the Steering and Brakes, Hydrostatic Steering-Danfoss |
| Hydraulic System | 479-677 | Troubleshooting - 100-Liter Pump, Preliminary Tests, 100 L Pump - Troubleshooting, Hydraulic System Diagnostic - Gear Pump |
| Cab | 678-720 | Tests of Operation, Troubleshooting - Air-Conditioning System, Ventilation and Heating - Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Hydraulic Relief Valve Pressure | 200 ± 5 bar | p. 489 |
| Brake Pedal-to-Pump-Piston Clearance | 0.15 – 0.20 mm | p. 434 |
| Brake Circuit Test Pressure | 23500 – 25500 kPa (235 – 255 bar, 3400 – 3700 psi) | p. 434 |
John Deere 6405, 6605 Common Problems This Manual Covers
John Deere 6405 hydraulic system loses pressure after warm-up, three-point hitch won't lift
Check hydraulic pump intake pressure first; anything below 130 kPa (1.3 bar/18.9 psi) points to a clogged filter or a suction-side air leak, and page 509 walks through the test. Drain a fluid sample and look for aeration. If intake checks good, run the full system pressure tests before condemning the pump.
Manual Section: Hydraulic System (100L Pump) Troubleshooting p. 509PowrQuad transmission slips when shifting under load, worst once the oil gets hot
Test transmission lubrication pressure at 1000 RPM with oil at 38°C; you want 100 kPa (1 bar/14 psi), and the test setup is on page 269. Low readings mean internal leakage past clutch element seals. Compare system pressure against the spec for your model before pulling the transmission; slipping with good pressure points to worn clutch discs.
Manual Section: PowrQuad Transmission General Troubleshooting p. 269SyncroPlus gears grind when shifting, clutch pedal feels normal but won't fully release
Measure the clutch pedal stroke from the fastening hole of the clutch hub; spec is 51±1 mm, listed with the rest of the transmission specs on page 156. Adjust the regulating bolt to bring it into range, then torque the lock nut to 15 Nm (11 lb-ft). If grinding continues, check the gearshift fork regulation bolts, torqued to 40 Nm (30 ft-lb).
Manual Section: SyncroPlus Transmission Troubleshooting p. 156Front wheel drive won't engage and differential lock grinds during turns in the field
Test the FWD solenoid with a multimeter; resistance should read 11 to 13 Ohms, and page 404 covers the check. Replace the solenoid if it reads open or shorted. For the differential lock grinding, run the clutch release pressure test and inspect for leaks at the lock housing before splitting the tractor to get at the bearings.
Manual Section: FWD, Differential Lock, and PTO Diagnosis p. 404Steering feels heavy at idle and brake pedals travel too far before grabbing
Check the steering safety valve pressure; spec runs 23500 to 25500 kPa (3400 to 3700 psi), with the adjustment procedure on page 435. Bleed air out of the brake system, then set brake pedal clearance to 0.15 to 0.20 mm. Heavy steering at idle with normal pressure at speed usually means pump flow, not the valve.
Manual Section: Steering and Brakes Troubleshooting p. 435Frequently Asked Questions
How to reset John Deere 6405 hour meter after replacement?
The manual describes the Hour Meter's function and operation, noting it marks working hours when connected to the alternator's D+ terminal. However, it does not provide a specific procedure for resetting the hour meter after replacement. p. 82
How to reset John Deere 6405 PTO engagement error?
If the engine stops and then restarts with the PTO on, a safety device will keep the PTO from functioning. To resolve this, it is necessary to turn off the PTO and then turn it back on. The manual does not specify a general 'PTO engagement error' reset procedure beyond this operational cycle. p. 59
What are the torque specs for John Deere 6405 differential bolts?
The manual does not provide specific torque specifications for the differential bolts. For issues like incorrect adjustment of the crown and pinion or damaged components, it refers to the 'Technical Manual for Repairs Group 56' for detailed repair and adjustment procedures. p. 419
What are the torque specs for John Deere 6605 transmission housing bolts?
The manual does not provide specific torque specifications for the transmission housing bolts. It does mention tightening regulating bolts for gearshift forks with 40 Nm (30 lb-ft) but this is for internal components, not the main housing. p. 155
What do John Deere 6405 error code 1234 and 5678 mean?
The manual provides a 'List of Error Codes of the Hydraulic lift' which includes three-digit codes ranging from 000 to 255. The specific error codes 1234 and 5678 are not listed in this manual. p. 558
How quickly can I access this John Deere 6405, 6605 manual after buying?
Immediate download of the complete 720-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Is this John Deere 6405, 6605 Service Manual printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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