Part of the Yanmar Parts Manuals.
Looking for the exact exploded views for your 1988-1992 crawler backhoe? This 235-page Yanmar B27 parts catalog PDF (OEM #Y00K2292) breaks down every boom cylinder, driving motor, and swivel joint for the YB271, B27-1, and B27 series machines. You get complete component identification with factory part numbers, cross-references, and highly detailed exploded diagrams. Open it up to find wiring diagrams for the electrical harnesses, full hydraulic schematics for the control valve piping, and complete parts lists for the 3TN84L-RBS engine.
What's Inside This Yanmar YB271 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| History of Model Change & Effective Machine Number List | - | Brake Valve, Turning, Control Valve, LUB.OIL Line, 3RD Valve, 2ND Lever |
| Work Lamp | - | Incandescent Lamp, Halogen Lamp |
| Boom & Boom Bracket | - | Arm W/BUSH, Pin Bush, O-Ring, Pin Assy, Bucket, Nipple B, Grease |
| Arm Cylinder | - | Cylinder Assy, Bucket, Tube W/BUSH, Bush, Cylinder Kit, Seal Set, Piston |
| Heater & Defroster | - | Heater Assy, Valve, Hose, Cover, Defroster, Clamp |
| Seat & Seat Mount | - | Seat, Operator, Slider, Cushion, Mount, Spring Washer |
| Radio | - | Assy, Bracket, Panel, Speaker, Antenna, Lead Wire |
| Cabin | - | Canopy Assy, Pole, Roof, Grommet, Glass, Hinge |
| Canopy | - | Cylinder Assy, Tube W/Bush, Seal Set, Rod W/Bush, Head, Piston |
| Step & Instrument Panel | - | Seat, Slider, Back, Cushion, Mount, Plate |
| Hyd. Oil Tank | - | Connector, Elbow, O-Ring, Pipe, Hose, Clamp |
| Muffler | - | Flange, Pipe, Stay, Gasket, Clamp, Bolt |
| Air Cleaner & Support | - | Hose, Duct, Cleaner Assy, Body, Element, Support |
| Engine Mount | - | Stopper Shim, Stay, Mount, Hose, Clamp, Radiator |
| Radiator & Mount | - | Tank Assy, Cock, Cap, Gauge, Pipe, Hose |
| Bonnet | - | Cabin Assy, Grommet, Screw Cap, Mark, Pin, Cabin |
| Hyd. Oil Pump & Joint | - | Motor Assy, Driving, GEAR(B), Planetary, Gear, Sun, Shaft, Housing |
| Tool, Tool Box & Manual Case | - | Tool Assy, Wrench, Bar Wrench, Box Wrench, Gun 800, Grease, Tool Box Assy |
| Fuel Tank & Fuel Line | - | Tank Assy, Fuel, Gauge, Strainer, Fuel Inlet, Hose |
| Swing Cylinder | - | Cylinder Assy, Blade, Bush, Seal Set, Head, Piston, Rod W/BUSH |
| Greasing | - | Boom W/BUSH, Pin Bush, Nipple, Shim Set, Cotter Pin, Bracket |
| Bucket Cylinder | - | Cylinder Assy, Swing, Seal Set, Head, Piston, Rod W/BUSH, Plunger |
| Arm & Bucket Link | - | Bucket Assy, Side Cutter, Bucket, Teeth Assy, Teeth Shim Set, Pin Kit, Nipple |
| Blade Cylinder | - | Mount, Pump, Coupling, Pump Assy, HYDL.OIL, Front |
| Blade | - | - |
| Remote Control Valve & Cut Off Valve | - | Valve Cmp, Lever, Cover, Spring, Plate, Washer |
| Driving Motor | - | Motor Assy, Plug, Ball, Drive Valve, Spring, Plate |
| 3rd Valve (Valve) | - | Reservoir Assy, Rod, Strainer, Element, Valve, Spring |
| Accelerator | - | Absorber, Bed, Support, Bracket, Stopper, Spring Washer |
| Crawler | - | Bush, Support, Cover, Plate, Spring Washer, Nipple |
| Battery | - | Harness, Clamp, Bush, Link, Grommet, Washer |
| Frame & Guard | - | Bearing, Seal Set, Seal, Bolt, Parallel Pin, Knob |
| Turning Bearing & Turning Lock | - | Bearing, Turning, Seal Set, Parallel Pin, Knob, Lock Lever |
| Frame Cover | - | Catch, Magnet, Step, Panel, Plate, Cover |
| Turning Motor | - | Joint, Swivel, Shaft, Flange, Hub |
| Swivel Joint | - | Valve Assy, Control, Body Assy, Cover, Seat, Spring, Plug |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| YB271, B27, B27-1 (variants: YB271-U/UR/UZ/UZR, B27-C/CR/P/PR/SP/SPR) | ||
| Crawler Backhoe | ||
| 3TN84L-RBS / 3TN84L-RBF | ||
| 235 | ||
| Y00K2292 | ||
| Boom & Boom Bracket, Arm Cylinder, Swing Cylinder, Hyd. Oil Tank, Hyd. Oil Pump & Joint, Driving Motor, Control Valve, Swivel Joint, Crawler, Frame & Guard, Engine Parts |
Yanmar YB271 Common Problems This Manual Covers
Yanmar B27-1 final drive leaking gear oil from the sprocket seal and machine will not travel
Check the Chassis Parts Diagram on page 58 to locate the final drive seal kit. Cross-reference the serial number to find the exact replacement seal part number. Replace these track drive seals every 1000 hours to prevent gear oil loss.
Manual Section: Driving Motor p. 58Weak hydraulic digging action and slow boom or bucket response during heavy operation
Inspect the Hydraulic Parts Diagram on page 130 for the return filter and suction strainer elements. Locate the exact part numbers for your specific machine serial range. Order and install new 10-micron filters to restore proper fluid flow.
Manual Section: Hyd. Oil Tank p. 130Engine starts poorly, turns over slowly, and runs weakly in cold weather
Review the Engine Parts Diagram on page 27 to identify the correct fuel filter and air element assemblies. Match the part numbers against your specific engine code. Order replacements to ensure the 12V fuel delivery system remains unrestricted.
Manual Section: Fuel Tank & Fuel Line p. 27Excess vibration and grinding noise from the swing drive components when turning the cab
Examine the Turning Bearing parts list to view the swing circle and bearing components. Match the 16mm mounting bolts and bearing seal kit part numbers to your serial break. Verify the correct grease nipple part numbers for your scheduled lubrication.
Manual Section: Turning Bearing & Turning LockFrequently Asked Questions
How do you fix yanmar B27-1 final drive leaking gear oil from the sprocket seal and machine will not travel?
Check the Chassis Parts Diagram on page 58 to locate the final drive seal kit. Cross-reference the serial number to find the exact replacement seal part number. Replace these track drive seals every 1000 hours to prevent gear oil loss. p. 58
How do you fix weak hydraulic digging action and slow boom or bucket response during heavy operation?
Inspect the Hydraulic Parts Diagram on page 130 for the return filter and suction strainer elements. Locate the exact part numbers for your specific machine serial range. Order and install new 10-micron filters to restore proper fluid flow. p. 130
How do you fix engine starts poorly, turns over slowly, and runs weakly in cold weather
Review the Engine Parts Diagram on page 27 to identify the correct fuel filter and air element assemblies. Match the part numbers against your specific engine code. Order replacements to ensure the 12V fuel delivery system remains unrestricted. p. 27
How quickly can I access this Yanmar YB271, B27-1, YANMAR Crawler Backhoe?
This is a 235-page searchable PDF (4 MB) ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this Yanmar YB271, B27-1, YANMAR Crawler Backhoe YB271, B27?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this Yanmar YB271, B27-1, YANMAR Crawler Backhoe YB271, B27, 4JH-DT?
Included. The Yanmar YB271, B27-1, YANMAR Crawler Backhoe YB271, B27, 4JH-DT, 4JH-DTZ, 4JH-DTZA, 4JH-DTZP, 3TN 84L-RBS, 3TN 84L-RBF, YB271 U, YB271 UR, YB271 UZ, YB271 UZR, B27 C, B27 CR, B27 P, B27 PR, B27 SP, B27 SPR, B27-PR, YB271-UZP(R), B27-CR, YB271-UC(R) Parts Catalog provides a wiring diagram for the electrical system.
![Yanmar B22-2 C(R)EP, B22-2 P(R)EP, B22-2 P[R], B22-2 C[R] exploded view diagram of the engine mount assembly components.](https://youfixthis.com/wp-content/uploads/2026/06/yanmar-b22-2-to-c-r-crawler-backhoe-parts-catalog-y00s3241-engine-parts-22-150x150.webp)
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