Part of the Yanmar Repair Manuals.
Before you put a gauge on a B55W-2 that goes weak after an hour of work, you need the relief pressures, and guessing at them costs a crew their afternoon. This service manual for the Yanmar B55W-2 wheel excavator (serial number 5001 and up) puts those figures on a specifications page alongside brake, swing and accumulator values.
Across 994 pages it works through the 4TNV98-E engine, transmission, axles and ram lock valve, swing bearing, cylinders, main control valve, swing and travel motors, the full electrical schematic, and the boom, arm and bucket. Hydraulic troubleshooting tables pair each symptom with a cause and a remedy, and torque and clearance data back up the wrench work.
The PDF is bookmarked at 825 points, so the trip from download to the exact page you need is a few clicks, not an evening of scrolling.
What's Inside This Yanmar B55W-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 9-54 | Wheel Excavator Safety (Safety Precautions, Applicable Models, To the Operator of a Excavator, Location of Safety Labels, Summary of Safety Precautions for Lifting in Working Mode, Unauthorized Modifications, Before Starting Engine, Machine Operation, Maintenance, Battery, Towing, Shipping and Transportation, Lifting with Sling) |
| Specifications | 55-86 | Specification for DX55W |
| General Maintenance | 87-126 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 127-184 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing |
| Lower Structure and Chassis | 185-258 | Ram Lock Valve, Axle |
| Engine and Drive Train | 259-582 | Engine, Transmission, Drive Coupling (Main Pump) |
| Hydraulics | 583-905 | Hydraulic System Troubleshooting, Testing and Adjustment, Accumulator, Center Joint, Cylinders, Main Control Valve, Swing Motor, Travel Motor |
| Electrical System | 906-970 | Electrical Schematic (DX55W) |
| Attachments | 971-994 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic filter filtering grain size | 10μ (rated) or smaller | p. 737 |
| Hydraulic filter replacement interval | every 250 hours (after initial 50 hours) | p. 739 |
| Fuel filter replacement interval | every 500 hours (after initial 50 hours) | p. 342 |
| Fuel filter tightening torque | 14 - 17 ft·lb (19.6 - 23.5 N·m; 2.0 - 2.4 kgf·m) | p. 332 |
| Engine oil filter replacement interval | every 500 hours (after initial 50 hours) | p. 345 |
| Air cleaner element cleaning air pressure | 42 -71 psi (0.29 -0.49 MPa; 3.0 -5.0 kgf/cm2) | p. 337 |
| Air cleaner element replacement interval | every 500 hours | p. 342 |
| Fuel and coolant hoses replacement interval | every two years | p. 351 |
| O-rings and seals replacement recommendation | replace whenever the assembly is being overhauled or re-assemble | p. 631 |
| Travel Motor Taper roller bearings replacement criteria | replace body assembly if damaged or not smooth | p. 767 |
| Oil temperature abnormally high cause and remedy (Oil cooler clogged or air circulation to cooler blocked) | Clean | p. 608 |
| Oil temperature abnormally high cause and remedy (Cooling fan belt tension too loose) | Readjust belt tension | p. 608 |
Yanmar B55W-2 Common Problems This Manual Covers
Hydraulic oil overheats after warm-up
Oil temperature climbs once the machine has been working a while and every function slows with it. The troubleshooting tables in the Hydraulics section trace this symptom to causes such as a clogged oil cooler, blocked air flow to the cooler or a loose cooling fan belt, and give the remedy for each.
Manual Section: Hydraulics p. 583Machine loses drive on one side
A B55W-2 that pulls to one side or stops traveling altogether usually has trouble in a travel motor or its supply circuit. The Travel Motor chapter in the Hydraulics section covers disassembly, inspection criteria for the bearings and internal parts, and reassembly.
Manual Section: Hydraulics p. 583Engine cranks but will not start
The 4TNV98-E spins over but never fires, or starts and then stalls, most often from fuel delivery problems, air in the lines or plugged filters. This section covers the fuel system with filter service intervals and tightening torques, plus valve clearance and head bolt data for deeper engine work.
Manual Section: Engine and Drive Train p. 259Play or clunk in the swing
Slop or a rhythmic knock when the house rotates usually points to the swing bearing. The Upper Structure section covers swing bearing service along with the counterweight, cabin, fuel tank and fuel transfer pump.
Manual Section: Upper Structure p. 127Axle oscillation lock feels soft
On a wheel excavator, a leaking ram lock valve lets the axle move when it should be held rigid, and the machine feels unstable the moment you start digging. This section covers the ram lock valve and axle service.
Manual Section: Lower Structure and Chassis p. 185Intermittent electrical faults
Dead gauges, lighting failures and starting circuit gremlins come down to chasing wires. The Electrical System section carries the machine's full electrical schematic — the book prints it, like its specification section, under the Doosan designation DX55W, which is the same machine as the B55W-2 — so you can trace each circuit instead of swapping parts on a hunch.
Manual Section: Electrical System p. 906Worn bucket pins and bushings
Pins and bushings wear oval and the slop telegraphs up through the arm into every grading pass. The Attachments section covers boom, arm and bucket service.
Manual Section: Attachments p. 971Frequently Asked Questions
Which machine does this manual cover?
The Yanmar B55W-2 wheel excavator, serial number 5001 and up, powered by the Yanmar 4TNV98-E diesel engine. It is the factory service manual, publication number K1038983AE, written in English.
Does it cover hydraulic pressure testing and adjustment?
Yes. The Hydraulics section opens with troubleshooting, testing and adjustment, then works through the accumulator, center joint, cylinders, main control valve, swing motor and travel motor. p. 583
Are wiring diagrams included?
Yes. The Electrical System section includes the complete electrical schematic for the B55W-2 along with service information for the electrical system. p. 906
Does it include engine rebuild specifications?
Yes. The Engine and Drive Train section covers the 4TNV98-E with clearance and torque data, for example valve clearance of 0.15 to 0.25 mm and cylinder head bolt torque of 76 to 83 ft-lb, plus transmission and main pump drive coupling service. p. 259
What do I get after purchasing this Yanmar B55W-2 manual?
Instant PDF download (321 MB). You get the full 994-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this Yanmar B55W-2 manual include wiring diagrams?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Yanmar B55W-2.
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