Part of the Yanmar Parts Manuals.
This 141-page B27 Parts Catalog PDF covers machine variants: B27(AMMANN), B27(ENGLAND AUSTRALIA), and B27(EUROPE) crawler excavators. Inside, you get exploded-view diagrams and OEM part numbers for every major system: hydraulic oil piping, control valve, swivel joint, turning motor, driving motor, boom and arm cylinders, and the full crawler undercarriage. Wiring diagrams and hydraulic schematics are included too, giving you a complete picture of how each circuit connects before you pull a single part number. Every sub-assembly in the engine section carries its own OEM number: air cleaner body, muffler flange and gasket, fuel strainer, and radiator mount hardware listed out individually. Ordering the wrong part costs you two days and a restocking fee. Bookmarked and keyword-searchable: open it on any device, find your system, and order right the first time.
What's Inside This Yanmar B27-P(R), B27-C(R), B27, 3TN84L-RBS Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Air Cleaner, Fuel Tank & Fuel Line, Accelerator | |
| Cooling System | Radiator & Mount | |
| Engine | Muffler, Engine Mount, Hyd. Oil Pump & Joint, Turning Bearing & Turning Lock | |
| Electrical System | Work Lamp, Electric Part, Battery | |
| Undercarriage & Travel | Roller & Adjust, Crawler | |
| Rear Axle, Differential & Brakes | Turning Brake Valve | |
| Hydraulics & 3-Point Hitch | Hyd. Oil Tank, Hyd. Oil Piping, Arm Cylinder, Boom Cylinder, Swing Cylinder, 3rd Valve, Bucket Cylinder, Blade Cylinder, Turning Motor, Swivel Joint, Control Valve | |
| Loader, Backhoe & Attachments | Boom & Arm, Bucket, Blade | |
| Body & Operator Station | Heater & Defroster, Step, Instrument Panel & Seat Mount, Radio, Canopy, Cabin, Bonnet, Frame, Frame Cover | |
| Decals & Accessories | Label, Tool, Tools Box & Manual Case, Greasing | |
| Other Components | Driving Motor, Link Stand, Control Equipment, Operation Lever Stopper |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Yanmar B27 Crawler Excavator | ||
| B27-P(R), B27-C(R), B27 | ||
| 3TN84L-RBS | ||
| Parts Catalog | ||
| 141 | ||
| Y00S2891 | ||
| 172142-73300 | ||
| 172141-70500 |
Yanmar B27-P(R), B27-C(R), B27, 3TN84L-RBS Common Problems This Manual Covers
Driving motor seal set needed for travel system, unclear which part number fits machine variant
Find the Driving Motor section in the Chassis Parts Diagram on page 63. Locate the Seal Set line item under Motor and Drive Valve. Note the motor displacement (cc/rev) from Technical Specifications on page 3 to confirm you have the correct variant. Check the Parts Number List on page 6 for B27-P(R), B27-C(R), and B27 applicability separately.
Manual Section: Driving Motor p. 63Bucket teeth assembly and side cutters worn, need correct part numbers to reorder
Open the Boom & Attachment Parts Diagram on page 132 under Bucket. Locate the Teeth Assy, Side Cutter, and Shim Set entries. Verify bucket capacity from Technical Specifications on page 3 to confirm correct teeth sizing. Order Cotter Pin and Nipple alongside Teeth Assy: the exploded view shows they are listed separately but replaced as a group.
Manual Section: Boom & Arm p. 132Fuel tank strainer and fuel line parts needed, no usable part numbers from old paperwork
Find the Fuel Tank & Fuel Line section in the Engine Parts Diagram on page 24. Locate the Strainer, Fuel Inlet, Pipe Fuel, and Cap Fuel Tank entries. Verify fuel tank capacity in liters against Technical Specifications on page 3. Cross-reference all part numbers against the Parts Number List on page 6 before ordering.
Manual Section: Fuel Tank & Fuel Line p. 24Turning bearing seal set identification needed, upper and lower seals appear to share one listing
Check the Chassis Parts Diagram on page 63, Turning Bearing & Turning Lock section. Locate Seal Upper and Seal Lower entries separately: they carry distinct part numbers. Identify Parallel Pin and Lock Lever in the same section. Verify bearing diameter in mm against Technical Specifications on page 3 before ordering to avoid fitment errors.
Manual Section: Turning Bearing & Turning Lock p. 63Frequently Asked Questions
What are the replacement specifications for hydraulic hoses?
The manual provides part numbers for various hydraulic hoses. For example, in the 'HYD. OIL PIPING (VALVE-MOTOR, BOOM)' section (Fig. 54) on page 118, item 7 is specified as 'HOSE F406G 05' with part number 172122-78200, and item 8 is 'HOSE' with part number 172142-78660. These part numbers are crucial for identifying the correct replacement hoses. p. 118
What are the replacement specifications for hydraulic pump components?
The manual lists specific part numbers for hydraulic pump components. In the 'HYD. OIL PUMP & JOINT' section (Fig. 41) on page 92, the 'MOTOR ASSY, DRIVING' is identified by part number 172142-73300. Additionally, a 'SEAL ASSY' for the pump has part number 172141-70500. These part numbers are essential for sourcing the correct replacement parts. p. 92
How do you fix B27 arm cylinder leaking, seal kit part number needed to order correct replacement?
Open the Hydraulic Parts Diagram on page 91 and locate the Arm Cylinder assembly. Identify the Seal Set entry, which covers CYL.HEAD and Piston seals as one kit. Verify cylinder bore diameter against Technical Specifications on page 3 before ordering. Cross-reference the part number on the Parts Number List on page 6 to confirm serial number applicability. p. 91
How do you fix track link assembly and shoe plates worn out, need correct undercarriage part numbers?
Check the Chassis Parts Diagram on page 63, Roller & Adjust section. Locate the Link Assy, Pin, Bush, and Plate Shoe entries separately. Record the track pitch in mm and verify it against Technical Specifications on page 3. Order Link Assy, Pin, and Bush together: mismatching new pins with worn bushings shortens service life. p. 63
Is this B27 manual a digital download?
Instant PDF download. You get the full 141-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this B27?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are electrical wiring diagrams included in this B27?
A wiring diagram for the B27 electrical system is included.
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