Part of the Yanmar Repair Manuals.
A weak travel motor on a B22-2 can park a whole crew while you guess at whether the fault is a cross-plumbed hose, a sticking pilot valve, or low main relief pressure. Yanmar publication 17197020 takes the guessing out. It is the factory service manual for the B22-2 and B22-2A crawler excavators, covering both the 3TN75L and 3TNE78A diesel engines across 448 pages.
The book runs from full engine disassembly (cylinder block, crankshaft, timing gear) through the hydraulic system, undercarriage and track adjustment, swing system, electrical equipment, and a troubleshooting section that sorts real breakdowns from non-breakdowns. Servicing standards list wear limits and tightening torques so worn parts get measured, not guessed at.
It arrives as a 10.76 MB PDF with 134 bookmarks, downloadable right after purchase and printable page by page. Pull the torque before you pull the bolt, and the second teardown never happens.
What's Inside This Yanmar B22-2, B22-2A Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 6-14 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Attaching and Detaching Hydraulic Equipment |
| Technical Data | 15-26 | Specifications, External Drawing and Working Ranges, Weight of Main Parts, Lifting Capacities |
| Servicing Standards | 27-43 | Machine Performance, Engine, Undercarriage, Control Devices, Hydraulic Equipment, Work Implement, List of Tightening Torque |
| Engine | 44-88 | Cylinder Block, Cylinder Head, Piston and Piston Pins, Connecting Rods, Crankshaft and Main Bearing Metal, Camshaft and Tappets, Timing Gear |
| Operating Circuit | 90-133 | Hydraulic Circuit Schematic |
| Hydraulic System | 134-207 | Hydraulic Pump, Valve Ass'y, Relief Valve, Pilot Pump, Piston Pump |
| Cut-Off Valve | 208-218 | Relief Valve, Solenoid-Operated Directional Control Valve, Manual Directional Control Valve |
| Pilot Valve | 219-245 | Handle, Port Plate, Pressure Reducing Valve Section, Spool, Casing, Push Rod, Joint |
| Control Valve | 246-272 | Right Valve Group, Center Valve Group, Left Valve Group, System Relief Valve, Circuit Relief Valves, Anti-Void Valve |
| Swing Motor | 273-289 | Orbit Motor, Pinion Gear Assembly, Brake Valve, Damper, Valve Body, Cartridge, Geroller |
| Travel Motor | 290-332 | Counter-Balance Valve, Relief Valve, Two-Speed Switch Mechanism, Reduction Gear |
| Pressure Adjustment | 333-339 | PTO Selector Valve (for Merging with Hydraulic PTO) |
| Adjustment Procedures for Each Equipment | 340-404 | Electrical Equipment of the Machine, Undercarriage, Controls, Swing System, Hydraulic Equipment, Cabin |
| Periodic Inspection | 405-407 | List of Periodic Inspection and Servicing |
| Fuel, Lube Oil and Grease Recommended | 408-409 | Fuel, Lube Oil and Grease Recommended by Yanmar |
| Troubleshooting | 410-446 | Non-Breakdowns |
| Reference Data | 447-448 | Bucket Installation Dimension |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulic system air-venting operation time | 10~15 minutes | p. 14 |
| Hydraulic cylinder air-venting cycles | 4 to 5 times | p. 14 |
| Sprocket bolt tightening torque | 8.0~10.0 kgf-m | p. 41 |
| Track roller tightening nut torque | 14~19 kgf-m | p. 41 |
| Hydraulic hose clamp (at boom rear) tightening torque | 4.5~6.0 kgf-m | p. 42 |
| Hydraulic hose clamp (for 3rd hose) tightening torque | 8.0~10.0 kgf-m | p. 42 |
| Hose clamp (at boom rear) tightening torque | 4.5~6.0 kgf-m | p. 42 |
| Hose clamp (for P.T.O. selector valve hose) tightening torque | 8~10 kgf-m | p. 42 |
| Oil Filter Replacement Interval | 500 hours | p. 71 |
| Thermostat Full-Open Temperature | 85°C | p. 73 |
| Rubber track models | ||
| Track tension adjustment (Rubber track) | 8~13mm | p. 350 |
| Steel track models | ||
| Track tension adjustment (Steel track) | 105~115mm | p. 351 |
Yanmar B22-2, B22-2A Common Problems This Manual Covers
Thrown or loose track
A track that walks off the idler on a slope usually traces back to tension nobody checked. The manual's adjustment procedure floats the track with the boom and sets clearance at the second track roller: 8 to 13 mm for rubber tracks, 105 to 115 mm for steel.
Manual Section: 6 Adjustment Procedures for Each Equipment p. 340One travel or swing function weak
B22 owners report a single side going weak or dead, often after hose work leaves the circuit cross-plumbed. The hydraulic circuit schematic and operating circuit descriptions let you trace each line from pilot valve to travel or swing motor and find the routing error instead of swapping parts.
Manual Section: 5 Hydraulic System p. 89Spongy controls after hydraulic work
Air left in the circuit after a hose or cylinder replacement makes the boom and arm feel soft and jerky. The manual's bleeding procedure runs each circuit 10 to 15 minutes at medium speed and cycles cylinders 4 to 5 times to within 50 to 100 mm of each stroke end.
Manual Section: 1 General Cautions for Maintenance Work p. 6Engine overheating under load
Overheating on these three-cylinder Yanmars often comes down to a lazy thermostat or tired cooling hoses. The engine section gives the thermostat full-open temperature of 85 degrees C so you can bench-test it instead of replacing it on suspicion.
Manual Section: 4 Engine p. 44Sprocket bolts backing out
Loose final drive sprocket bolts announce themselves as a clunk on every rotation, and running them loose ruins the sprocket. The torque list calls for 8.0 to 10.0 kgf-m on sprocket bolts and 14 to 19 kgf-m on track roller tightening nuts, both with Three Bond 1324.
Manual Section: 3 Servicing Standards p. 27Worn bucket pins and bushings
Slop at the bucket makes fine grading impossible and hammers the bores wider every hour it runs. The servicing standards for the work implement give the wear limits that tell you whether pins, bushings, or both have to go.
Manual Section: 3 Servicing Standards p. 27Hydraulics slow or noisy when warm
Functions that get sluggish or whiny after warm-up can be low oil, air ingress, or a genuine pump or valve fault. The troubleshooting section walks symptom by symptom to the cause, and even flags the non-breakdowns that only look like failures.
Manual Section: 9 Troubleshooting p. 410Frequently Asked Questions
Which machines and engines does this manual cover?
It covers the Yanmar B22-2 crawler excavator with the 3TN75L engine and the B22-2A with the 3TNE78A. The Technical Data section carries specifications, external drawings, working ranges, weights of main parts, and lifting capacities for both models. p. 15
Does it give track tension adjustment specs?
Yes. The Adjustment Procedures section covers tension for both track types: float the track with the boom and set 8 to 13 mm clearance at the second track roller for rubber tracks, or 105 to 115 mm between track frame center and shoe plate for steel tracks. p. 340
Are tightening torques included?
The Servicing Standards section includes a full torque list. Examples: final drive sprocket bolts at 8.0 to 10.0 kgf-m, track roller tightening nuts at 14 to 19 kgf-m, and hydraulic hose clamps at the boom rear at 4.5 to 6.0 kgf-m. p. 27
Can it help me diagnose a hydraulic problem?
Yes. The Troubleshooting section works symptom by symptom, including a list of non-breakdowns that only look like faults, and the Hydraulic System section supplies the circuit schematics and pilot valve, control valve, and swing motor detail you need to trace the cause. p. 410
Will this Service Manual download right away?
Immediate download of the complete 448-page searchable Service Manual (11 MB). Access it on any device, from a laptop at your desk to a phone in the field.
Can I print a copy of this Service Manual for the shop?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are there wiring harness diagrams in this Yanmar B22-2 manual?
The contents list electrical equipment of the machine under Adjustment Procedures rather than a separate wiring-harness chapter, so treat the electrical side as service procedures, not a full harness diagram set. The schematics this book does carry are hydraulic: the Operating Circuit section gives the hydraulic circuit schematic and the operating circuit descriptions, with the system relief valve set pressure at 175 kgf/cm2 on page 17.
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