Part of the John Deere Repair Manuals.
A hydrostatic transmission that creeps, a PTO that won't engage, a harness fault before hay season: the 444 pages of this John Deere 4105 technical manual PDF (TM102419) exist to close out exactly those jobs on your compact utility tractor. Wiring diagrams trace every circuit from the key switch through the fuse block, and hydraulic schematics map oil flow through the loader valve and three-point hitch so you can test pressures instead of swapping parts on a hunch. The electrical section alone fills roughly a quarter of the book, covering component location, diagnostics, and repair for the whole harness. Fill the crankcase to 4.3 liters with a new filter, set slow idle at 950 rpm, and pressure-test the radiator cap against its 88 kPa spec. Guess wrong on a hydro diagnosis and you eat a pump you didn't need. Bookmarked and text-searchable, this PDF puts the right test in front of you before the weather window closes.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety and General Information | 5-24 | Safety Practices, Fastener Torque Values, O-Ring Seal Service, Gasket Sealant Application |
| Engine (Diesel) - Specifications | 25-36 | Engine Specifications, Valve Lash, Compression Pressure, Oil Pressure |
| Engine (Diesel) - Diagnostics, Tests and Adjustments | 37-72 | Engine Diagnosis, Test Procedures, Adjustments, Fuel System Checks |
| Engine (Diesel) - Repair | 73-131 | Engine Teardown, Component Replacement, Reassembly Torques |
| Electrical - Component Location | 132-158 | Component Locations, Harness Routing, Connector Identification |
| Electrical - Operation and Diagnostics | 159-217 | Circuit Operation, Diagnostic Procedures, Symptom Charts |
| Electrical - Tests, Adjustments and Repair | 218-246 | Component Testing, Adjustments, Electrical Repair |
| Power Train (Hydrostatic) - Location and Repair | 247-279 | Hydrostatic Component Location, Transmission Repair |
| Power Train (Final Drive and PTO) - Location and Repair | 280-348 | Final Drive Component Location, Final Drive Repair, PTO Repair |
| Hydraulics - Component Location, Schematics and Theory | 349-375 | Hydraulic Component Location, Schematics, Theory of Operation |
| Hydraulics - Repair | 376-429 | Hydraulic Component Repair, Pump and Valve Service |
| Miscellaneous Repair | 430-445 | Miscellaneous Service Procedures |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Radiator Cap Opening Pressure | 88 ± 15 kPa (12.8 ± 2.2 psi) | p. 29 |
| Opening Pressure | 88 kPa (12.8 psi) | p. 29 |
| Engine Oil Capacity (with filter) | 4.3 L | p. 25 |
| Cooling System Capacity | 5.3 L | p. 25 |
| Slow Idle Speed | 950 ± 50 rpm | p. 25 |
| High Idle Speed (No Load) | 2975 ± 50 rpm | p. 25 |
| Valve Clearance | 0.15 - 0.25 mm | p. 55 |
| Alternator Output | 40 amps | p. 130 |
| Battery CCA Rating | 500 amps | p. 130 |
| Hydrostatic Charge Pressure | 1800 kPa | p. 245 |
| Steering System Pressure | 10340 kPa | p. 347 |
| PTO Clutch Pressure (Full Throttle) | 860 - 1380 kPa | p. 347 |
