Part of the Yanmar Repair Manuals.
When a V4-5 that used to climb into the pile starts crawling up to it, the answer usually lives in the hydrostatic drive, and this Yanmar service manual (publication 52700020) shows you how to test the H.S.T. pump and motor before you start throwing parts at it. It covers the V3-5, V4-5 and V4-5HL wheel loaders sold in the US market, powered by the 3TNE84-EKAH and 3TNE84T-EKAH diesel engines.
Across 300 pages you get service standards, engine measurement and adjustment, full hydraulic equipment coverage for the pump, motor, control valve, orbit roll and cylinders, plus axle repair, pressure adjustment and a troubleshooting quick reference. The technical data chapter includes the hydraulic circuit diagram and wiring diagram.
The PDF carries 136 bookmarks, so you can jump straight to a chapter, print the pages you need at the bench, and keep the file for as long as you own the loader.
What's Inside This Yanmar V3-5, V4-5, V4-5HL (US) Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 6-16 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 17-32 | Specifications, External Drawings and Working Area (Canopy Type, Cabin Type), Hydraulic Circuit Diagram, Wiring Diagram, Mass List of Main Parts |
| Service Standards | 33-49 | Machine Performance, Engine Specifications, Controls, Undercarriage, Hydraulic Equipment, Implements (Front Implements) |
| Engine | 50-126 | Outline (Structural Drawing, Cooling Water, Lubricating Oil and Fuel, Fuel Injection System) |
| Structure and Operation | 127-144 | 5-1 Outline, 5-2 Component Parts, 5-3 Power Transmission Device, 5-4 Steering System, 5-5 Electrical Equipment |
| Hydraulic Equipment | 145-223 | 6-1 Hydraulic Pump (H.S.T.), 6-2 Hydraulic Motor (H.S.T.), 6-3 Troubleshooting for Hydraulic Pump and Motor (H.S.T.), 6-4 Control Valve, 6-5 Orbit Roll, 6-6 Hydraulic Cylinders |
| Adjustment and Repair | 224-283 | 7-1 Machine, 7-2 Hydraulic Pump (H.S.T.), 7-3 Front and Rear Axles, 7-4 Controls, 7-5 Adjustment of Pressure, 7-6 Loader Towing at Hydraulic Power Source Failure, 7-7 Cabin |
| Periodic Inspection and Servicing | 284-286 | 8-1 List of Periodic Inspection and Servicing |
| Fuel, Lube Oil and Grease Recommended | 287-288 | Fuel, Lube Oil, Grease, Transfer Oil, Hydraulic Oil, Cooling Water |
| Troubleshooting | 289-299 | Quick Reference Table for Troubleshooting, Troubleshooting Through Measurement of Compression Pressure |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic hose (Union nut (PF) 1/8) tightening torque | 7.23 to 10.84 ft·lbf (9.8 to 14.7 N·m) | p. 47 |
| Cylinder head bolt (Class 1) tightening torque | 62.92 to 67.07 ft·lbf (85.3 to 91.2 N·m) | p. 48 |
| Cylinder bore dia. (L mark) Standard clearance | 3.3070 to 3.3083 in. (84.000 to 84.030 mm) | p. 36 |
| Operating mass | 7540 lbs (3420 kg) | p. 18 |
| Hydraulic hose 1/2 (Union nut (PF)) torque | 43.37 to 46.99 ft-lbf (58.8 to 63.7 N·m) | p. 48 |
Yanmar V3-5, V4-5, V4-5HL (US) Common Problems This Manual Covers
Loader loses drive power under load
A tired hydrostatic transmission shows up first on the pile, when the machine stalls out pushing instead of digging in. The manual dedicates a full troubleshooting procedure to the H.S.T. pump and motor so you can isolate the fault before ordering parts.
Manual Section: Chapter 6 Hydraulic Equipment p. 145Hard starting and white smoke
On these three-cylinder Yanmar diesels, hard starting often traces back to low compression or fuel injection trouble. The troubleshooting chapter includes a quick reference table and a procedure for diagnosing faults through compression pressure measurement.
Manual Section: Chapter 10 Troubleshooting p. 289Lift arms slow or weak
When bucket breakout fades or the lift arms crawl, relief pressure settings are the first thing to check. The adjustment and repair chapter covers pressure adjustment along with control and machine-side repairs, so you can verify settings instead of guessing.
Manual Section: Chapter 7 Adjustment and Repair p. 224Steering feels loose or wanders
Articulated loaders that get worked hard develop slop in the steering long before anything fails outright. The structure and operation chapter explains the steering system and power transmission device so you understand what you are looking at before you open it up.
Manual Section: Chapter 5 Structure and Operation p. 127Engine running hot
Cooling problems on a loader that idles in dust all day can come from the water system, the radiator or the oil cooler. The engine chapter covers the cooling water and lubricating oil circuits, with checks for water leakage and the oil cooler.
Manual Section: Chapter 4 Engine p. 50Electrical faults and dead circuits
Chasing a dead gauge or a no-crank condition without a schematic is guesswork. The technical data chapter includes the wiring diagram and hydraulic circuit diagram for tracing circuits wire by wire.
Manual Section: Chapter 2 Technical Data p. 17Frequently Asked Questions
Which machines and engines does this manual cover?
It covers the Yanmar V3-5, V4-5 and V4-5HL wheel loaders (US market), fitted with the 3TNE84-EKAH and 3TNE84T-EKAH diesel engines. Publication number 52700020, 300 pages, in English.
Does it cover the hydrostatic transmission?
Yes. Chapter 6 Hydraulic Equipment covers the H.S.T. hydraulic pump and motor, including a dedicated troubleshooting section for both, plus the control valve, orbit roll and hydraulic cylinders. p. 145
Are torque specs and service limits included?
Yes. Chapter 3 Service Standards includes tightening torque lists for bolts and nuts on both the machine side and engine side, along with service data for the engine, controls, undercarriage, hydraulic equipment and front implements. p. 33
Does it include wiring and hydraulic diagrams?
Yes. Chapter 2 Technical Data contains the wiring diagram, the hydraulic circuit diagram, specifications, external drawings for canopy and cabin types, and a mass list of main parts. p. 17
What format is this manual in?
This is a 300-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 specific sections of 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.
Does this Yanmar V3-5 manual have electrical schematics?
The wiring diagram is on page 144, in the Chapter 2 Technical Data material described above, together with the hydraulic circuit diagram. There is no separate harness or connector-pinout chapter beyond it.
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