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 p. 58
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 MotorWeak hydraulic digging action and slow boom or bucket response during heavy operation p. 130
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 TankEngine starts poorly, turns over slowly, and runs weakly in cold weather p. 27
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 LineExcess 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.
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.
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.
How do you find the correct seal set for a leaking swing cylinder on the Yanmar YB271?
Locate the Swing Cylinder diagram on page 119. The seal set and rod assembly are listed with individual part numbers. Identify your serial range, order the correct seal set, and replace to eliminate the slow swing and fluid loss.
How do you identify the correct hydraulic pump assembly and gear components for the B27 or YB271?
Refer to the Hyd. Oil Pump and Joint section starting around page 116. It lists the pump assembly, planetary gear, sun gear, and housing components by part number. Cross-reference your model suffix (B27-C, YB271-U, etc.) to confirm applicability before ordering.
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