All 355 pages of this Yanmar EF685 Technical Manual PDF focus on one machine: the EF685 diesel tractor, from fuel injection pump to rear axle and hydraulic auto-control. Inside, you get complete wiring diagrams spanning cell motor, charge, fuel, alarm, and security circuits, plus hydraulic schematics for the entire auto-control system. Open the troubleshooting sections and you'll find problem diagnosis charts for the High-Efficiency Diesel engine and hydraulic system, exploded views of transmission and PTO components, and torque specs pulled straight from factory data. Greasing intervals are set at 50 hours; the EF685 delivers 68 gross PS at 2500 rpm with a pivot-pin lifting capacity of 800 kg. No more hunting forum posts for numbers your dealer won't share. Bookmarked and searchable: one keyword, one click, back to wrenching.
What's Inside This Yanmar EF685 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3 | - |
| Introduction | 12-39 | To the Owner, Important Warranty Information, Declaration of Conformity, Maintenance, Supply Period for Maintenance Parts, Improvements, Note, Symbol Indication |
| Periodical Inspection | 40-61 | Check Intervals, List of Oils, Greases and Antifreeze, List of Lubricants and Water Capacities, Equivalent Oil to Transmission Fluid Tf500, How to Inspect and Replace Theoil |
| Rough Disassembly of Components | 62-79 | How to Open/Close the Frontgrill and the Side Covers, Cabin Separation Andreassembly (Cabin Versiononly), How to Tilt the Fuel Tank, Propeller Shaft Separation |
| Engine | 80-107 | Construction and Functions, Removing and Reinstallingthe Fuel Injection Pump, Adjusting the Accelerator Lever and the Footaccelerator Pedal |
| High- Efficiency Dieselengine | 108-169 | Construction and Functions, Control Outline, Precautions for Handling, Replacement Procedure Forthe Engine Governor Assembly, Problem Diagnosis |
| Transmission | 170-207 | Construction and Functions, Damper Disc, Main Clutch and Powerreverser |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Radiator hose replacement interval | every two years | p. 30 |
| Max. Lifting Capacity @Pivot Pin | 800 kg | p. 28 |
| Engine Output (Gross PS/rpm) | 68/2500 | p. 26 |
| Greasing Interval | 50 hours | p. 54 |
Yanmar EF685 Common Problems This Manual Covers
Yanmar EF685 engine overheats under load, temperature gauge spikes, power drops p. 108
Check coolant level first. If low, inspect the radiator hose for cracks or swelling and replace if it has not been swapped within two years per the maintenance schedule on page 30. Pressure-test the cooling system to isolate a leaking core, faulty thermostat, or blocked passages. Verify the fan belt is tensioned correctly and the radiator fins are clear of debris before returning the tractor to service.
Manual Section: High- Efficiency DieselengineEngine won't start or cranks slowly in cold weather, no response from key p. 303
Inspect the battery terminals for corrosion and clean to bare metal. Load-test the battery: a healthy 12V unit should hold above 9.6V under cranking load. Check fuses and slow-blow fuses at page 59 before condemning the starter. Trace the cell motor and charge circuit using the diagram starting at page 303. If fuel delivery is suspect, inspect fuel lines for kinks or blockage per the Fuel Lines Inspection section.
Manual Section: Electric EquipmentHydraulic lift responds slowly, won't reach full height, or stops holding position p. 299
Pull the hydraulic fluid dipstick and top up to the full mark if low. Inspect the hydraulic filter and replace if overdue — a clogged filter starves the pump of flow at the worst operating points. Run through the symptom-based diagnosis chart beginning at page 299 to isolate whether the fault is in the pump, control valve, or a sensor. The system's maximum rated lift at the pivot pin is 800 kg, so any shortfall below that spec points directly at a pressure or flow deficit.
Manual Section: Hydraulic Auto ControlEngine runs rough, surges at idle, or loses power under PTO or drawbar load
Start at the air cleaner: a plugged element cuts airflow and mimics injector failure. Remove and inspect the element, replace if caked with dust. Then verify fuel flow from tank to injection pump is unrestricted and the fuel filter is clean. If performance stays flat, check the accelerator lever and foot pedal adjustment per page 107. For deeper diagnosis, connect the checker harness and work through the engine problem diagnosis procedure beginning.
Manual Section: High- Efficiency DieselengineFront axle shows oil weeping around seals or at differential cover, puddle under tractor overnight p. 208
Clean the axle housing and dry it with compressed air, then run the tractor for 15 minutes to pressurize the system and pinpoint the exact leak source before ordering parts. Apply grease to all front axle fittings on the 50-hour interval (page 54) to keep seal lips lubricated and slow wear. Disassembly and seal replacement procedures are in the Front Axle section beginning at page 208. Match replacement seals to the serial number on page 26 to confirm part compatibility with your build.
Manual Section: Front AxleFrequently Asked Questions
What are the torque specs for Yanmar EF685 engine bolts?
The manual provides specific tightening torque values for various engine bolts. For example, the cylinder head bolt (M11x1.25) requires a tightening torque of 103 to 112.9 N·m (10.5 to 11.5 kgf·m) with lubricating oil applied. The connecting rod bolt (M10x1.0) requires 53.9 to 58.8 N·m (5.5 to 6.0 kgf·m) with lubricating oil.
What do Yanmar EF685 error codes mean?
Yanmar EF685 error codes are indicated by the trouble monitor lamp blinking a specific number of times, or by display lamps. For instance, 9 blinks indicate an 'Over speed' problem, while 8 blinks signify a 'Rack actuator error'. The depth lamp blinking six times points to a 'Lift angle sensor' error, and seven times to a 'Position sensor' error.
Why won’t my Yanmar EF685 start?
If your Yanmar EF685 tractor won't start, the issue could be related to several components. If the starter does not run, check Fuse 5A (Reverser, PTO valve, Starter relay), the Starter, PTO drive switch, Neutral relay, Safety relay, Reverser lever switch, Fuse 15A (Electronic governor, Engine), Key switch, Electronic governor relay, Actuator relay, or the Electronic governor controller. If the starter runs but the engine does not, check the fuel system, mixing of fuel and air, or the fuel filter.
What are the replacement specifications for fuel filter?
The fuel filter element on the Yanmar EF685 should be replaced every 300 operating hours or every 6 months, whichever comes first. The part code for the fuel filter element is 119802-55800. The water separator element, part code 119802-55710, should also be replaced at the same interval.
What do I get after purchasing this Yanmar EF685 manual?
This is a 355-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?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Are there wiring harness diagrams in this Yanmar EF685 manual?
Included. The Yanmar EF685 Technical Manual provides a wiring diagram for the electrical system.
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