Description

Yanmar Vi045-5, Vi055-5, Vi045-5B, Vi055-5B Service Manual

You have a Yanmar Vi045-5, Vi055-5, Vi045-5B, Vi055-5B Service Manual in your hands or you are thinking about buying one. Let me tell you what that means on the shop floor. It means you stop guessing which bolt gets 58 ft-lbs instead of 72. It means you stop tearing down a swing motor twice because the aftermarket diagram skipped the pressure adjustment sequence. I have been torquing head bolts since before some of you were born, and I can tell you right now: the difference between factory OEM documentation and a third-party summary is the difference between a job that stays fixed and a comeback that costs you a Saturday. This manual runs 644 pages. That is not a coffee-table book. That is a workbench reference that covers every circuit, every relief valve setting, and every damned seal orientation you will need on these Yanmar excavators.

General Cautions for Maintenance Work: Chapter 1 in Practice

Skip this chapter and you will pay for it. Section 1-2 lays out the safety precautions that apply to these specific machines. 1-5 covers the removal and installation of hydraulic equipment, and if you have ever seen a guy blow a seal because he did not wrap the threads, you know why that section exists. 1-8 walks through correct installation of hydraulic hose, including the routing that Yanmar engineers tested. 1-10 shows the air release procedure for hydraulic equipment. Every one of those sub-sections was written by people who designed the machine, not by a writer who looked at a parts diagram. Use this chapter as your pre-flight checklist.

Technical Data and Specifications

Chapter 2 is where you go when the customer says “it feels slow” and you need hard numbers. Section 2-1 gives the full specifications for the Vi045-5, Vi055-5, Vi045-5B, and Vi055-5B. 2-3 is the weight list of main parts – handy when you are pulling a counterweight. 2-4 lists lifting capacity. You cannot guess that on a job site. The outline drawings in 2-2 show working areas for both canopy type and cabin type. If you are adding a quick coupler, you need those dimensions. I keep a copy of page 2-1-1 laminated on my toolbox.

Service Standards and Torque Specs: Where the Real Work Happens

Chapter 3, Service Standards, is the chapter I wear out fastest. Section 3-3 lists rubber and steel track specifications, including the common specs for both. 3-5 covers hydraulic cylinders with bore and stroke data. But the part you will bookmark is 3-7: the list of tightening torque. Machine torque values, engine torque values, and tightening torque for general bolts and nuts. Need the torque for the engine mounting bolts? Page 3-7-2. Need the spec for the swing motor fasteners? Same section. I have seen guys snap bolts because they used generic automotive torque tables. Do not do that. Use the factory table from this manual. Period.

Engine Troubleshooting and Adjustment

Chapter 4 is the engine section, and Yanmar put the troubleshooting first – 4-2 includes a quick reference table and compression pressure measurement diagnostics. 4-3 covers inspection and adjustment: valve clearance, fuel injection valve injection pressure, injection timing adjustment, fan belt tension, and sensor inspection. The periodic maintenance schedule in 4-3-12 tells you exactly when to change the oil and coolant. The engine body breakdown in 4-4 goes into cylinder head, gear train, camshaft, and cylinder block service. If you are pulling the head, you need the procedures in 4-4-2. Do not rely on memory. Rely on this manual.

Hydraulic System: Circuit Operation and Pressure Adjustment

Hydraulic systems are where most DIYers and even some pros lose billable hours. Chapter 5 gives you the hydraulic circuit schematic and then breaks down each operation: boom, arm, bucket, swing, boom swing, blade, travel, and simultaneous moves like boom-up with arm retract. Section 5-4 covers pressure adjustment for relief valves, swing brake valve, and cut-off valve. If your blade drifts or the swing brake chatters, the answer is in 5-4. Chapter 6 then dives into the hardware: hydraulic pump, control valve, pilot valve, swing motor, travel motor, blade control pilot valve, solenoid valve for P.T.O., and the pilot check valve for quick coupler circuit. Each component section includes disassembly, inspection, and reassembly steps.

7 Systems Covered: From Engine to Hydraulic Equipment

This manual covers the engine (chapter 4), the hydraulic system (chapter 5), the hydraulic equipment (chapter 6), and the adjustment and repair procedures for electrical equipment (chapter 7). The wiring diagram in 7-1-3 is OEM, not redrawn. The monitor and alarm system diagnostics in 7-1-2 will save you from chasing ghost codes. And if you are working on a machine with the ESX control system, the circuit descriptions in 7-1-4 cover start/stop and battery charge logic. You get all of this from Yanmar, not from a reprint house.

Before you buy a generic PDF off some sketchy site, think about what you are paying for. This is the same manual that Yanmar dealers use. It was printed for the US spec machines. The torque values are in ft-lbs, the fluid capacities are in quarts and gallons. The Manual Transmission section? Not in this manual – these are excavators. But if you need that, we have other manuals. For the excavator, what you need is right here. Compare it to the Automotive Industry Overview if you want, but automotive standards don’t apply to construction equipment hydraulics. Stick with the manufacturer’s data.

Related manuals you might need: Ammann Yanmar Mini Excavators Operation Manual, Ammann Yanmar MIDI-EXCAVATORS Operation & Maintenance Manual, and AMMANN YANMAR B55W Wheel Excavator Operation Manual. Those are operation and maintenance manuals – the service manual is the deeper dive.

FAQ

Does this manual include wiring diagrams?

Yes. Section 7-1-3 has the complete wiring diagram.

What torque values are listed for the undercarriage?

Section 3-7-1 lists machine-specific tightening torques, including undercarriage fasteners. The torque for track-adjusting bolts, sprocket mounting bolts, and roller bracket bolts are all in that section. The manual also provides the tightening torque for general bolts and nuts in 3-7-3, so you can look up any standard fastener by size and grade. Do not mix up SAE and metric torque specs – this manual uses both where applicable, and the tables are clearly labeled. If you need the torque for the travel motor attaching bolts, check the Service Standards chapter, then cross-reference with the hydraulic equipment disassembly procedure in Chapter 6 for any additional tightening sequences.

You have a machine that needs proper factory documentation. You have a manual that covers the engine, hydraulics, electrical system, and every torque spec from the Yanmar service department. Access the Factory Manual now and keep it on your tablet or printed out. Your next repair will go faster, and it will stay fixed.