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 John Deere 4105 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 |
John Deere 4105 Common Problems This Manual Covers
Loader hydraulics work fine cold, then get weak or drop out intermittently under load
Inspect the loader quick couplers first; a coupler that is not fully seated acts exactly like a failing valve. Clean and reseat both halves, then torque any weeping O-ring face seal fittings to the chart values on page 13. If steering also feels heavy, test the steering circuit at 10340 kPa, page 347, to rule out the pump.
Manual Section: Hydraulics p. 345Temperature gauge climbs high during mowing or loader work, coolant pushes out the overflow
Pressure test the radiator cap; it should hold 88 ± 15 kPa (12.8 ± 2.2 psi), spec on page 29, and caps on this model give out often. Replace the thermostat and inspect both radiator hoses while the system is drained, then refill with 5.3 L of coolant and clean chaff from the radiator screen before the next cutting.
Manual Section: Engine - DieselFrequently Asked Questions
What are the torque specifications for the John Deere 4105 rear wheel bolts?
The torque specification for the rear wheel bolts on the John Deere 4105 is 140 N\u2022m (103 lb-ft). p. 430
How do you fix a John Deere 4105 that starts and idles fine, then dies when it shifts into gear or the PTO engages?
Work the interlock circuits, not the engine. The seat switch S3 and the PTO solenoid Y3 are both mapped in the electrical component location section — S3 on page 157, Y3 on page 132 — and the main schematic and wiring harness legend on page 133 shows how they tie together. Check continuity at each with the operator seated, then confirm slow idle is within the 950 ± 50 rpm the specifications on page 25 call for; the slow idle adjust procedure is on page 53. p. 157
How do you fix engine shuts down hot and will not restart until the tractor sits and cools completely?
Test the ignition switch and fuel shutoff solenoid while the tractor is still hot; a component that fails warm will pass every test cold. Load test the battery against its 500 amp CCA rating and verify charging output near 40 amps, both specs on page 130. Wiggle harness grounds while cranking to catch a heat-swollen connection. p. 130
How do you fix three-point hitch will not stop at the set height, rockshaft keeps lifting to full travel?
Check the rockshaft position feedback linkage first; a bent or disconnected rod tells the valve to keep lifting. Adjust the linkage per the Hydraulics section starting on page 345, then run a lift cycle test at high idle, 2975 \u00b1 50 rpm no load, and verify the hitch stops and holds at the lever setting. p. 345
How is this manual delivered?
A 444-page Technical Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Does this manual allow printing?
Yes. No DRM, nothing blocks printing, so run off the pages you need on whatever printer you have.
Is there a hydraulic diagram in this manual?
Yes. The manual includes a hydraulic system diagram covering the main circuits. There is one on page 252, for example.
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