Part of the John Deere Repair Manuals.
Rebuilding a charging system on an older Deere machine? This 576-page John Deere Alternators Technical Manual PDF (CTM77) walks through alternator and starter motor repair for every OEM supplier: Delco-Remy 10SI, 12SI, 15SI and 21SI, Motorola 8E-Series, plus Niehoff, Denso, Bosch, Valeo, Magneton, Leece-Neville, Prestolite and Iskra units. You get theory-of-operation sections for each family, exploded views for teardown and reassembly, a seven-step electrical test procedure, and troubleshooting charts for charging and starting circuit failures. Page after page of repair specifications backs up every job on your bench. Torque the regulator mounting screws to 2 N-m (20 lb-in.) and the drive end bearing retainer plate cap screws to 3.0 N-m (26 lb-in.); a good ground should read 0.0 to 0.5 volts. No more swapping parts to guess at a bad diode trio. Bookmarked PDF opens on any device; search any spec by keyword and get wrenching.
Complete the set for your Alternators & Starter Motors (all OEM units)
- Operation & Tests: John Deere 5220, 5320, 5420, 5520 Diagnostic Technical Manual — Wiring Diagrams
- Repair Manual: John Deere 5520, 5420, 5320, 5220 Technical Manual
- Repair Manual: John Deere 5105, 5205 Technical Manual (incl. Wiring)
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction and Safety Information | 9-30 | Safety Precautions, How to Use This Component Technical Manual, Unified Inch and Metric Torque Values, General Charging and Starting Circuit Terms |
| Delco-Remy Alternators | 31-72 | Delco-Remy Alternator Theory of Operation, Delco-Remy 10SI, 12SI and 15SI Alternator Repair, Delco-Remy 21SI Alternator Repair |
| Motorola Alternators | 73-172 | Motorola Alternator Theory of Operation, Motorola 8E-Series Alternator Repair, Motorola Hc-, Ma-, MR-Series Alternator Repair, Motorola A-, Ra-, 8AR-Series Alternator Repair |
| Niehoff Alternators | 173-224 | Niehoff Alternator Theory of Operation, Niehoff 12-Volt, 110-Amp Alternator Repair, Niehoff 24-Volt, 50-Amp Alternator Repair |
| Denso Alternators | 225-264 | Denso Alternator Theory of Operation, Denso Alternator with Add-On Regulator Repair, Denso Alternator with Built-In Regulator Repair |
| Robert Bosch Alternators | 265-288 | Robert Bosch Alternator Theory of Operation, Robert Bosch Alternator Repair |
| Valeo Alternators | 289-318 | Valeo Alternator Theory of Operation, Valeo Alternator Repair, Valeo A13N-Series Alternator Repair |
| Magneton Alternators | 319-336 | Magneton Alternator Theory of Operation, Magneton Alternator Repair |
| Leece-Neville Alternators | 337-346 | Alternator Operation, Repair Specifications, Charging System Failure, Alternator Troubleshooting, Diode Trio Test, Adjust Regulator |
| Prestolite Alternators | 347-354 | Alternator Operation, Charging Circuit Test Specifications, Repair Alternator, Charging System Failure, Alternator Troubleshooting, Test Alternator |
| Delco-Remy Starter Motors | 355-444 | Starting Circuit Theory of Operation, Starter Motor Repair Specifications, Diagnosing Starter Motor Malfunctions, Disassemble Starter Motor, Inspect Armature |
| John Deere/Denso Starter Motors | 445-508 | Starting Circuit Theory of Operation, Starter Motor Repair Specifications, Test Starter Motor Before Disassembly, Diagnose No-Load Test, Inspect Armature, Assemble Starter Motor |
| Robert Bosch Starter Motors | 509-530 | Starting Circuit Theory of Operation, Starter Motor Repair Specifications, Diagnosing Starter Motor Malfunctions, Robert Bosch Starter Motor Exploded View, Testing Armature |
| Iskra Starter Motors | 531-552 | Starting Circuit Theory of Operation, Starter Motor Repair Specifications, Exploded View of Iskra Starter Motor, Troubleshooting, Disassembly of Starter Motor |
| Valeo Starter Motors | 553-570 | Starting Circuit Theory of Operation, Starter Motor Repair Specifications, Exploded View of Starter Motor, Disassembly of Starter Motor, Testing Armature |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Normal indicated voltage at a ground connection | 0.0 to 0.5 volts | p. 23 |
| Alternator bearings lubricant | Delco-Remy Lubricant No. 1948791 | p. 36 |
| Regulator Mounting Screws Torque | 2 N•m (20 lb-in.) | p. 53 |
| Drive End Bearing Retainer Plate Cap Screws Torque | 3.0 N•m (26 lb-in.) | p. 54 |
| Slip Ring-to-Shaft - Torque | 40 N·m (30 lb-ft) | p. 88 |
| Loose belts | Loose belts | p. 352 |
| Unified Inch Bolt and Cap Screw Torque (Lubricated, Grade 8, 1/2 inch) | 120 N•m (88 lb-ft) | p. 19 |
| Metric Bolt and Cap Screw Torque (Lubricated, Class 12.9, M10) | 75 N•m (55 lb-ft) | p. 20 |
| Delco-Remy Model 12SI Alternator Pulley Nut Torque | 100 N•m (75 lb-ft) | p. 38 |
