Need the factory repair procedures for your Yanmar excavator? This 448-page Yanmar b22-2 service manual pdf (OEM #17197020) breaks down every mechanical and electrical system on the B22-2 and B22-2A models. Inside, you get complete hydraulic schematics to trace fluid routing, full wiring diagrams, and a massive troubleshooting section to track down stubborn operational faults. Open the file to step-by-step teardown instructions for the engine, undercarriage, and pilot valves, backed by clear exploded views and periodic inspection schedules. Lock down the final drive sprocket bolts to 8.0-10.0 kgf-m, then run the engine at medium speed for 10 to 15 minutes to properly bleed the hydraulic circuit after a rebuild. Quit tearing apart components blindly. Grab this bookmarked download, open it on your tablet right in the dirt, and get your machine digging again.
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 | Outline, 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
Yanmar B22-2 and B22-2A hydraulic functions slow, jerky, or noisy after warm-up. p. 14
Inspect the hydraulic fluid level and bleed air from the circuit on page 14. Operate the engine at medium speed and activate the respective circuit for 10~15 minutes. Extend and retract the cylinder slowly 4 to 5 times up to 50~100mm from each stroke end.
Manual Section: 1 General Cautions for Maintenance WorkMachine drifts on slopes or track skips over the drive sprocket under heavy load. p. 350
Lift either side of the track using the boom. Measure the clearance between the second track roller and track tread on page 350. Adjust the rubber track tension to 8~13mm. Torque the sprocket bolts to 8.0~10.0 kgf-m if they are loose.
Manual Section: 6 Adjustment Procedures for Each EquipmentEngine overheats quickly under heavy digging load or coolant leaks rapidly from the radiator hoses. p. 73
Inspect all coolant hoses for dry rot and verify the fan belt tension daily. Test the thermostat in heated water. Replace the unit if it fails to reach its full opening temperature of 85°C as specified on page 73.
Manual Section: 4 EngineLeft side travel or boom swing function weak, dead, or only works intermittently. p. 42
Verify the hydraulic line routing matches the schematic. Inspect the pilot valve and control valve circuits. Check all hose clamps at the boom rear on page 42 and tighten them to 4.5~6.0 kgf-m to prevent pressure loss and ensure correct fluid delivery.
Manual Section: Hydraulic System (Swing/Travel)Frequently Asked Questions
How do I reset the hydraulic system on a YANMAR B22-2?
The hydraulic system can be reset by air-venting after disassembly or parts replacement. This involves pouring hydraulic oil into the tank, loosening the bleeder port plug of the pump (tighten to 1.9~2.3 kgf-m after venting), and then operating the engine at medium speed for 10-15 minutes to bleed each component. For hydraulic cylinders, extend and retract slowly 4-5 times up to 50-100mm from each stroke end, then fully extend and retract 3-4 times.
What are the torque specs for YANMAR B22-2 final drive bolts?
The torque specifications for the final drive (travel motor) mounting bolts are 8.0~10.0 kgf-m for M12 bolts connecting the travel motor to both the upper frame and the track frame.
What are the torque specs for YANMAR B22-2 track tensioner or idler bolts?
For the YANMAR B22-2, the idler seal to idler & track spring nut (M10) should be torqued to 0.9~1.4 kgf-m. The track roller tightening nut (M16) has a torque specification of 14~19 kgf-m.
What are the replacement specifications for Hydraulic hoses?
Hydraulic hose specifications include the Yanmar Standard Type, Parts code No., hose material (e.g., Rubber hose, Plastic hose), type of hose, hose diameter (e.g., 02, 03, 04), hose length, and combination of fittings. Detailed tables provide inner and outer diameters, and working pressures (e.g., 300 kgf/cm² for SAE J517, 100R1, 04 dia.).
What is the engine oil capacity for the YANMAR B22-2 and B22-2A?
The engine oil capacity for both YANMAR B22-2 and B22-2A models is 3.6 liters.
What is the system relief valve set pressure for the YANMAR B22-2 and B22-2A?
The system relief valve set pressure for both YANMAR B22-2 and B22-2A models is 175 kgf/cm².
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