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Part of the John Deere Repair Manuals.
This is the complete John Deere factory diagnostic and repair manual (TM2147) for the 1420, 1435, 1445, 1545 and 1565 Series II front mowers. Across 1,660 pages it covers the gasoline engine on the 1420 and three generations of Yanmar diesel on the 1435 through 1565 - the 3TNE74, 3TNV76 and 3TNV80 on the mid-range units and the 3TNV82A and 3TNV88 on the 1545 and 1565. The manual walks through every major system: engine repair and adjustments, the full electrical system with wiring schematics and harness routing, the hydrostatic power train (both standard and 2-speed), hydraulic schematics and valve repair, steering, brakes, attachments, and cab systems including air conditioning. It is the same reference a John Deere dealer technician uses, with test pressures, torque values and diagnostic flowcharts called out system by system.
What's Inside This John Deere 1420, 1435, 1445, 1545, 1565 Series II Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | - | |
| Specifications and Information | Specifications, General Information, Interlock System | |
| Engine (Gasoline, 1420) | Specifications, Carburetor System, Ignition System, Diagnostics, Tests and Adjustments, Repair | |
| Diesel Engine (3TNE74, 3TNV76, 3TNV80) | Specifications, Fuel Injection, Injection Pump, Diagnostics, Tests and Adjustments, Repair | |
| Diesel Engine (3TNV82A, 3TNV88) | Specifications, Theory of Operation, Diagnostics, Tests and Adjustments, Repair | |
| Electrical | Specifications, Tools and Materials, General Information, Component Location, Schematics and Harnesses, Operation and Diagnostics, Tests and Adjustments, Repair, Cab, Cab Blower and Air Conditioner, MCS600 Plus | |
| Power Train | Specifications, Component Location, Diagnostics, Tests and Adjustments, Repair | |
| Power Train (2 Speed) | Specifications, Tools and Materials, Component Location, Diagnostics, Tests and Adjustments, Repair | |
| Hydraulics | Specifications, Tools and Materials, Component Location, Schematics, Theory of Operation, Diagnostics, Tests and Adjustments, Repair | |
| Steering | Specifications, Component Location, Theory of Operation, Diagnostics, Tests and Adjustments, Repair | |
| Brakes | Specifications, Component Location, Theory of Operation, Brake System Diagnostics, Tests and Adjustments, Repair | |
| Attachments | Specifications, Diagnostics, Tests and Adjustments, Repair | |
| Miscellaneous | Specifications, Tools and Materials, Component Location, Theory of Operation, Air Conditioning Diagnostics, Tests and Adjustments, Repair |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 1420, 1435, 1445, 1545, 1565 Series II | ||
| Engine Make (all models) | John Deere/Yanmar | |
| 1420 | ||
| Engine Model (1420) | 3TG72-JMA (4-cycle gasoline) | |
| Cylinders (1420) | 3 | |
| Bore x Stroke (1420) | 72 x 72 mm (2.84 x 2.84 in.) | |
| Displacement (1420) | 879 cm3 (53.6 cu-in.) | |
| Maximum Torque (1420) | 64.5 N.m (47.6 lb-ft) at 2300 rpm | |
| 1435, 1445 | ||
| Diesel Engine Models (1435, 1445) | 3TNE74, 3TNV76, 3TNV80 (Yanmar) | |
| 1545, 1565 | ||
| Diesel Engine Models (1545, 1565) | 3TNV82A, 3TNV88 (Yanmar) | |
John Deere 1420, 1435, 1445, 1545, 1565 Series II Common Problems This Manual Covers
Park brake not engaging or machine rolls when parked on a slope
Inspect brake friction disks for wear beyond the service limit and check brake return springs for stretch or breakage as described in the Brakes section. Verify the park brake lock lever assembly moves freely and adjust the linkage to the specified engagement position. Confirm brake holding function is within specification in the Brakes specifications group before returning the machine to service.
Manual Section: BrakesDeck lift cylinder slow or fails to raise under load
Check hydraulic fluid level and condition first, then use the Hydraulics section test and adjustment procedures to measure system relief pressure against the specified value. If pressure is low, test hydraulic pump output flow as documented in the Repair group. A worn pump or a stuck relief valve are the leading causes of slow lift under load, and the schematics show the circuit path so you can isolate the fault without chasing multiple components.
Manual Section: HydraulicsAlternator not charging or battery drains after short operation
Check drive belt tension and condition first, then test alternator output voltage at the battery with the engine running. The Electrical section covers alternator diagnosis in the Tests and Adjustments and Repair groups, including the expected charge voltage range and the procedure for testing the alternator in place. This lets you confirm whether the fault is in the charging circuit or the alternator itself before deciding to rebuild or replace.
Manual Section: ElectricalDiesel engine hard to start or runs rough at idle on 1435 or 1445.
Verify air filter restriction and fuel system integrity first - clogged pre-filters or air in the fuel line are the leading causes of hard starting on the Yanmar diesel units. The Diesel Engine section provides the diagnostic sequence and injection system tests separately for the 3TNE74/3TNV76/3TNV80 and the 3TNV82A/3TNV88 so you follow the correct procedure for your engine code. Check glow plug resistance if cold-start performance is the primary complaint.
Manual Section: Diesel Engine (3TNE74, 3TNV76, 3TNV80)Frequently Asked Questions
What engines are in the John Deere 1420, 1435, 1445, 1545 and 1565 Series II front mowers?
The 1420 runs a 3-cylinder John Deere/Yanmar 3TG72-JMA gasoline engine with 879 cc displacement and 64.5 N.m peak torque at 2300 rpm. The 1435 and 1445 use Yanmar diesel engines - the 3TNE74, 3TNV76 or 3TNV80 depending on build date. The larger 1545 and 1565 use the 3TNV82A or 3TNV88 Yanmar diesel. The manual has separate engine sections for each family so you are working from specs for the exact engine in your machine.
Why won't the park brake hold or why does the machine roll when parked on a slope?
The most common cause is worn brake friction disks, broken brake return springs, or a misadjusted park brake lock lever linkage. The Brakes section covers the theory of operation and provides the diagnostic flow for confirming brake engagement, testing the friction disks for wear, and adjusting the linkage back to the specified position so the machine holds on a slope without creeping.
How do I trace an electrical fault or read wiring schematics on the 1445?
The Electrical section includes full wiring schematics and harness routing diagrams, component location charts, and a structured diagnostic sequence covering Operation and Diagnostics. It also covers the cab blower, air conditioner, and the MCS600 Plus monitor system. Use the component location group first to find the connector, then trace the circuit on the schematic before measuring resistance or voltage at the suspected branch.
What is covered in the hydraulic section of TM2147?
The Hydraulics section contains system schematics, a Theory of Operation group, diagnostic charts, test and adjustment procedures, and full repair procedures for the hydraulic valves, pumps and components. It gives you the test pressures and relief valve settings so you can confirm whether a slow or non-responsive deck lift is a pressure fault, a valve fault or a pump issue before pulling parts.
Does TM2147 cover the 2-speed power train on the 1545 and 1565?
Yes. Section 55 is a dedicated 2-speed power train section with its own specifications, component location, diagnostic, adjustment and repair groups - separate from the standard power train section covering the other models. It walks through the 2-speed transmission components and the adjustment procedure so you can service the drive system without confusing it with the single-speed unit on the smaller machines.
