Every system on your compact tractor gets broken down to the bare bolts in this 89-page Yanmar KE-20T Technical Manual PDF. Open up detailed wiring diagrams for the preheating and charging circuits, complete hydraulic piping schematics, and full transmission exploded views. You get step-by-step teardown instructions for the clutch assembly, front axle, differential gear, and power steering valve, plus a dedicated section covering the hydraulic raising and lowering device. Dial in your clutch pedal play to exactly 15-25 mm and verify you have the correct 119853-77010 starting motor installed before tearing into the engine starting circuit. Stop guessing at adjustments and burning up expensive replacement parts. Download this bookmarked file directly to your tablet, tap the section you need, and get your tractor running right.
What's Inside This Yanmar KE-20T Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 4-5 | Safety-Alert Symbol, Improvements, Screw Tightening Torque Table, List of Oil and Water Supply, List of Periodic Inspections |
| Precautions for the Safe Services | 6-9 | Sufficient Ventilation, Flat Place, Proper Lifting and Support, Proper Tools, Tighten Bolts and Nuts, Battery Electrolyte Handling |
| General Precautions for Services | 10 | Yanmar Genuine Parts, Packing and O-Ring, Snap Ring Installation, Spring Pin Installation, Thrust Washer, Coupler Connection |
| Usage of the Liquid Gasket | 11-12 | Paring Sealant, Applying Liquid Gasket, Liquid Gasket Deterioration |
| I Outline and Specifications | 15-28 | Outline (Name of Each Part), Specifications, Engine (Outline, Fuel System, Lubrication System, Cooling Water System, List of Engine Tightening Bolts) |
| Ii Roughly Disassembling Tractor Components | 29-36 | Removing the Clutch (Preparation, Right-Side Removal Positions, Left-Side Removal Positions, Hydraulic Piping, Clutch Housing), Removing the Front Axle, Removing the Rear Axle Case |
| Iii Main Body | 37-54 | Main Body Power Transmission, Clutch Assembly (Structure and Function, Adjustment Standards, Disassembling the Clutch Assembly, Mounting the Clutch Assembly, Clutch Pedal) |
| Iv Hydraulic Raising/ Lowering Device | 55-68 | Hydraulic raising/lowering Device |
| V Electrical Device | 69-83 | Engine Starting/Stop Circuit (Outline, Locations and Functions of the Components, Circuit Diagram, Electrical Component Inspection Procedures) |
| Ke-20T Electric Circuit | 84-85 | Safety Relay, Generator, Regulator, Main Switch, Battery, Starter |
| Ke-20T Power Transmitting Diagram | 86 | Engine, PTO Shift, Rear PTO Shaft, Main Shift, Range Shift, Front and Rear Tires |
| Ke-20T Transmission Exploded View | 87 | Structure and Function, Cross-Sectional View of the Transmission, Disassembling the Transmission |
| Ke-20T Hydraulic Piping | 88 | Hydraulic Power Steering Cylinder, Front Axle Case, Flow Divider, Hydraulic Power Steering Valve, Hydraulic Pump, Hydraulic Cylinder Case |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery model | 55B24RL | p. 27 |
| Thermostat usage | not used | p. 25 |
| Starting motor part code | 119853-77010 | p. 27 |
| Key switch part number | 198162-52110 | p. 71 |
| Clutch Pedal Play | 15-25 mm | p. 40 |
| Steering Toe-in Value | 15-25 mm | p. 46 |
| Brake Pedal Play | 25-35 mm | p. 51 |
| Engine Head Bolt Torque (M9 x 1.25) | 6.0-6.5 kg-m | p. 28 |
| Engine Rod Bolt Torque (M7 x 1.0) | 2.3-2.8 kg-m | p. 28 |
| Generator Terminals Resistance (sb-sb) | 0.2-0.9 Ω | p. 83 |
Yanmar KE-20T Common Problems This Manual Covers
Yanmar Ke-20T engine won't start or turns over slowly in cold weather conditions p. 83
Test the starting and charging circuits. Check the generator terminal resistance on page 83; it must read 0.2-0.9 Ω. If the battery fails under load, replace it with a 55B24RL model. Clean all corroded connections to restore proper cranking speed.
Manual Section: Charging Circuit Electrical InspectionEngine coolant boils over and temperature gauge pegs hot during heavy field operation p. 28
Check the cooling system components. Verify radiator airflow and inspect the head gasket. Torque the engine head bolts to 6.0-6.5 kg-m as shown on page 28. Note that this engine does not use a standard thermostat, as confirmed on page 25.
Manual Section: I Outline and SpecificationsTractor loses power under load or gears grind heavily when attempting to shift p. 40
Adjust the clutch pedal linkage to restore proper engagement. Measure the clutch pedal play on page 40 and adjust the rod until you achieve 15-25 mm of free play. Inspect the release bearing and pressure plate if the grinding symptom persists.
Manual Section: Clutch Assembly ServiceTractor pulls to one side when stopping or brake pedal feels extremely soft p. 51
Adjust the brake linkage to ensure even stopping power. Measure the brake pedal play on page 51 and set it to exactly 25-35 mm. Verify the parking brake latch engages fully. Inspect the mechanical linkages for wear if the pedal remains spongy.
Manual Section: Brake AdjustmentFrequently Asked Questions
What are the torque specs for Yanmar KE-20T engine bolts?
The manual provides specific torque specifications for various engine bolts. For instance, the Head bolt (M9 x 1.25) requires a torque of 6.0-6.5 kg-m, the Rod bolt (M7 x 1.0) requires 2.3-2.8 kg-m, and the Flywheel mounting bolt (M10 x 1.25) requires 8.5-9.0 kg-m. These values are to be applied with lubricant on the thread.
What are the replacement specifications for battery?
The battery specifications for the Yanmar KE-20T are 12 V-36AH. The battery model is 55B24RL, and its part catalog number is 198164-51500. This battery supplies 12V DC as a power source for the tractor's electrical systems.
How do you fix yanmar Ke-20T engine won't start or turns over slowly in cold weather conditions?
Test the starting and charging circuits. Check the generator terminal resistance on page 83; it must read 0.2-0.9 Ω. If the battery fails under load, replace it with a 55B24RL model. Clean all corroded connections to restore proper cranking speed.
How do you fix engine coolant boils over and temperature gauge pegs hot during heavy field operation?
Check the cooling system components. Verify radiator airflow and inspect the head gasket. Torque the engine head bolts to 6.0-6.5 kg-m as shown on page 28. Note that this engine does not use a standard thermostat, as confirmed on page 25.
What format is this manual in?
This is a 89-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Yanmar Ke-20T Technical Manual cover the hydraulic system?
A hydraulic system diagram for the Yanmar Ke-20T is included.
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