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 |
|---|---|---|
| Preface (1) | 1 | - |
| Preface (2) | 2 | - |
| Specifications | 3 | - |
| Parts Name | 4 | - |
| Wiring Diagram | 5 | - |
| Tool, Tools Box & Manual Case | - | Plier, Wrench, Cotter Pin, Grease Gun, Tool Box Assy. |
| Heater & Defroster | - | Heater Assy, Valve, Hose, Defroster Asy, Nozzle |
| Step, Instrument Panel & Seat Mount | - | Bonnet, Seat, Lever, Spring, Rubber Cushion |
| Radio | - | Asy, Lead Wire, Speaker, Antenna |
| Canopy | - | Cabin, Glass, Lock, Rubber Cushion, Frame |
| Cabin | - | - |
| Hyd. Oil Tank | - | Connector, O- |
| Work Lamp | - | - |
| Boom & Arm | - | Bucket Assy, Side Cutter, Teeth Assy, Pin, Bucket, Nipple, Shim Set |
| Arm Cylinder | - | Cylinder Assy, Arm, Seal Set, CYL.HEAD, Tube W/BUSH, Piston, Nipple |
| Muffler | - | Flange, Pipe, Exhaust, Stay, Exhaust Pipe, Gasket, Silencer, Clamp |
| Air Cleaner | - | Hose, Suction, Cleaner Assy, Air, Body, Retainer, Element, Support |
| Engine Mount | - | Absorber, Shock, Bed (a), Engine, Support, ENGINE(L), Bracket |
| Radiator & Mount | - | Stay, Radiator, Mount, Hose, Water Drain, Sub-Tank Assy |
| Fuel Tank & Fuel Line | - | Tank Asy, Fuel, Cap, Fuel Tank, Pipe, Strainer, Fuel Inlet |
| Bonnet | - | Canopy, T Asy, Pole, Roof, Sheet, Non-Slip |
| Hyd. Oil Pump & Joint | - | Motor Assy, Driving, Bearing, Angular, Gear, Planetary, Sun |
| Swing Cylinder | - | Cylinder Assy, Seal Set, Head, Piston, Tube W/Bush, Rod W/Bush, Ring |
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
Yanmar B27 arm cylinder leaking, seal kit part number needed to order correct replacement p. 91
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.
Manual Section: Arm CylinderTrack link assembly and shoe plates worn out, need correct undercarriage part numbers p. 63
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.
Manual Section: Roller & AdjustDriving motor seal set needed for travel system, unclear which part number fits machine variant p. 63
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 MotorBucket teeth assembly and side cutters worn, need correct part numbers to reorder p. 132
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 & ArmFuel tank strainer and fuel line parts needed, no usable part numbers from old paperwork p. 24
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 LineTurning bearing seal set identification needed, upper and lower seals appear to share one listing p. 63
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 LockFrequently 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.
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.
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.
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.
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.
Document Quality
This document is a scanned PDF with an optical character recognition (OCR) layer, so you can search the full text. The main text, such as the preface and specifications, is generally crisp and readable, but some smaller text in the parts lists may appear slightly less sharp. Diagrams and illustrations are scanned images, meaning they may pixelate when zoomed in, though their labels are mostly clear. Pages are clean with minimal scan artifacts, and the overall page condition is good. There are no entirely blank pages, but some pages contain significant white space due to the layout of the content.
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