Part of the Yanmar Parts Manuals.
All 130 pages of this Yanmar B50 Parts Catalog cover one job: finding the right part for your B50, B50-P(R), or B50-O(R) Crawler Backhoe the first time. You get exploded-view diagrams and factory part numbers for every major system: engine mounts, radiator and oil cooler, all five hydraulic cylinders (boom, arm, bucket, swing, and blade), control valve assemblies, swivel joint, travel motor, and the complete oil piping layout. Wiring diagrams and hydraulic schematics add visual routing reference from the battery to the pilot valve. Pull seal dimensions directly from the page; the boom cylinder cross-references a 64x78x25 mm piston seal against tube and rod assemblies by OEM number. Your machine is down. Match the exploded view, grab the part number, skip the forum guessing. Bookmarks let you jump to any system by section; search by keyword on any device.
Other edition of this manual
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Inlet Hose & Exhaust Pipe | 10-11 | Pipe, Exhaust, Flange, Muffler, Gasket, Silencer, HOSE(A), Suction |
| Accelerator | 12-13 | Lever W/BUSH, Accel, Wire, Bracket, Joint, Cable, KNOB(D), Lever |
| Engine Mount | 14-15 | Mount, Stay, RADIATOR(L), HOSE(A), Pipe, Radiator, Bracket |
| Radiator & Oil Cooler | 16-17 | Radiator, Cap, Sub-Tank Assy, Cooler Assy, Oil, STAY(L), Cooler |
| Fuel Tank & Fuel Line | 18-19 | Fuel Tank Assy, Gauge, Fuel Oil, Cap, Fuel Tank, Strainer, Fuel Inlet, Hose |
| Battery | 20-21 | Cord(+), CORD(-), Retainer, ROD(B), Fix |
| Electric Part | 22-26 | Canopy Specification |
| Work Lamp | 27-28 | Lamp, Work, Bulb 12V-60W, Stay, Boom Light, Washer 12, Spring, Bolt M12X 25 Plated |
| Heater | 29-30 | Assy, Valve, Miniature, Hose, Tube, Base, Switch |
| Track Roller & Carrier Roller | 31-32 | Idler Assy, Bush, Shaft, Idler Seal, Adjust Cylinder, Valve Assy Nipple |
| Track Frame & Idler | 33-34 | Pin Master, Crawler Assy, Link Assy, Pin Track, Bolt Shoe, Crawler Rubber |
| Crawler | 35-36 | Bush, Support Link, Plate Link, Cushion, Circlip, Nipple Grease |
| Link Stand | 37-38 | Grommet, Lever, Knob, Link Bucket, Shaft Link, Rod-End |
| Control Equipment | 39-46 | Control EQUIP.(BOOM & Bucket), Control Equip.( |
| Operation Lever Stopper | 47-48 | |
| Turning Frame | 49-50 | |
| Turning Driving Gears | 51-52 | |
| Bonnet | 53-54 | Wing Bolt, Step, Seat, Adjuster, Cover, Grill |
| Seat & Step | 55-59 | Seat, Step, Cushion, Adjuster, Mount, Nut |
| Cabin | 60-62 | Assy, Glass, Door, Latch, Trim, Seal |
| Boom Cylinder | 63-68 | Cylinder, Tube Assy, Rod Assy, Piston, Seal Set, Bush |
| Arm Cylinder | 69-70 | Cylinder, Tube Assy, Rod Assy, Piston, Seal Set, Bush |
| Bucket Cylinder | 71-72 | Cylinder, Tube Assy, Rod Assy, Piston, Seal Set, Bush |
| Swing Cylinder | 73-74 | Cylinder, Tube Assy, Rod Assy, Piston, Seal Set, Bush |
| Blade Cylinder | 75-78 | Cylinder, Tube Assy, Rod Assy, Piston, Seal Set, Bush |
| Hyd. Oil Pump & Joint | 79-80 | Motor, Rotary Set, Piston, Case Set, Parallel Pin, Spring Washer |
| Turning Motor | 81-82 | Valve Brake, Valve Check, Spring, Plug, Valve Relief, Seal Set |
| Brake Valve | 83-84 | Valve Check, Spring, Plug, Seal Kit, Valve Assy Control, Piston Free |
| Travel Motor | 85-86 | Joint Assy Swivel, Shaft, Hub Swivel, Spacer Swivel, Seal Assy, O-Ring |
| Swivel Joint | 87-88 | Valve, Section Assy Inlet, Spring, O-Ring, Valve Relief, Tie-Rod |
| Control Valve | 89-98 | Section Assy Spool, Spring Control Valve, Poppet, Plate Seal, Head Bolt Socket, Valve Relief |
| Pilot Valve | 99-100 | Element W/Valve, Valve By-Pass, Spring Strainer, Plug Oil Feed, O-Ring |
| Hyd. Oil Tank | 101-102 | Hyd Oil Tank Assy, Bar Filter Support, Strainer Suction, Element W/Valve, Breather Air, Gauge Oil Level |
| Greasing | 103-104 | Connector, Elbow, Nipple, Joint, O-Ring, Hose |
| Hyd. Oil Piping | 105-118 | Tank-Valve |
| 3rd Valve Control | 119-122 | Adaptor, Connector, Elbow, O-Ring, Joint, Hose |
| 3rd Valve (Valve) | 123-125 | Pin, Arm, Bush, Spacer, O-Ring, Seal |
| Boom & Bucket | 126-127 | Shim, Blade, Bush, Pin, Plate, Cotter Pin |
| Blade | 128-130 | Bush, Pin, Bolt, Cotter Pin, O-Ring, Washer |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| SEAL 64 78 25 | 64x78x25 mm | p. 32 |
| SEAL WSF30X62X20 | 30x62x20 mm | p. 54 |
| Boom Swing Angle | Left 50 - Right 90 degree | p. 2 |
| Travel Speed (high-low) | 4.3(4.5)/2.2(2.3) km/h | p. 2 |
