Part of the Yanmar Parts Manuals.
Looking for the right factory numbers for your crawler back-hoe? This 172-page Yanmar Vio27-5B Parts Catalog PDF (OEM #0CS10-M52701EN) breaks down the complete chassis, hydraulic cylinders, engine components, and cab assembly. Inside, you get crystal-clear exploded views for every single system, paired with complete parts lists and precise OEM cross-references. Open straight to the boom assembly, travel motor, or control valve section to find the exact component identification required to build your order sheet. Verify specific replacement dimensions directly from the factory data, like the 1000mm dam seal length or the 1.5A diode current rating, before you ever pick up the phone to call the parts counter. Wasting days waiting on the wrong piece of iron kills your shop productivity. Grab this bookmarked digital file, jump straight to the system you are working on, and get the right component delivered on the first try.
What's Inside This Yanmar ViO27-5B Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Muffler & Air Cleaner, Accelerator, Fuel Tank, Fuel Line | |
| Cooling System | Radiator Shuraud, Radiator & Sub-Tank | |
| Engine | Engine Mount, Track Frame & Turning Bearing, Hyd.Oil Pump & Joint | |
| Electrical System | Battery, Electric Part | |
| Undercarriage & Travel | Sprocket & Roller, Track Roller, Idler & Adjust, Crawler, Travel Motor | |
| Hydraulics & 3-Point Hitch | Control Valve Plate, Boom Cylinder, Arm Cylinder, Bucket Cylinder, Swing Cylinder, Blade Cylinder, Hitch Cylinder, Turning Motor, Swivel Joint, Control Valve, Remote Control Valve, Hyd.Oil Tank, Hyd.Oil Piping, Control Piping, Quick Coupler, Holding Valve Kit | |
| Loader, Backhoe & Attachments | Boom Backet, Boom, Bucket Arm & Link, Bucket, Blade | |
| Body & Operator Station | Duct, Heater, Air Conditioner, Armrest, Turning Frame, Step & Floor Mat, Instrument Panel, Seat Mount, Seat & Handrail, Bonnet, Window Washer, Cabin, Cabin Door, Rearview Mirror, Canopy | |
| Decals & Accessories | Label, Safety Label, Greasing | |
| Other Components | Repair Parts, Control Equipment, Way Multi Lever, Accumulator, Arm |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| SEAL, DAM length (Ref.No.2) | 1000mm | p. 17 |
| DIODE current (Ref.No.1A) | 1.5A | p. 28 |
| DUCT ASSY length (Ref.No.1-1) | 2mm | p. 24 |
| HOSE, FUEL length (Ref.No.1) | 1470mm | p. 26 |
| HARNESS, WIRE length (Ref.No.3) | 140mm | p. 27 |
| BUSH thickness (Ref.No.5) | 2mm | p. 47 |
| STAND ASSY, LEVER width (Ref.No.2) | 41mm | p. 50 |
| PEDAL, SPEED length (Ref.No.2) | 17mm | p. 54 |
| MOUNT ASSY, SEAT length (Ref.No.3) | 64mm | p. 67 |
| SEAL, DAM length (Ref.No.45) | 1000mm | p. 75 |
| SEAT, SPRING thickness (Ref.No.1) | 2mm | p. 90 |
| FLANGE, SUCTION thickness (Ref.No.30) | 6mm | p. 122 |
Yanmar ViO27-5B Common Problems This Manual Covers
Yanmar Vio27-5B engine won't start or starts intermittently due to a corroded main wiring harness.
Check the battery components exploded view on page 27. Identify the correct replacement wire harness assembly. Verify you need the specific harness with a 140mm length. Cross-reference the part number with your machine's serial number before ordering to ensure correct fitment.
Manual Section: Battery p. 27Front track idler makes loud clunking noises and loses track tension during forward travel.
Inspect the idler and adjust assembly diagram on page 47. Locate the required replacement bush for the tensioner piston. Confirm the new bush matches the required 2mm thickness specification. Order the exact part number listed to rebuild the crawler spring assembly correctly.
Manual Section: Idler & Adjust p. 47Main boom cylinder drifts downward slowly when control levers are in the neutral position.
Review the boom cylinder parts breakdown on page 90. Find the correct internal components, including the spring seat. Ensure the replacement spring seat meets the required 2mm thickness. Match the seal kit part numbers to your exact cylinder serial number before rebuilding.
Manual Section: Boom Cylinder p. 90Engine runs hot and starves for fuel because of a cracked or leaking main supply line.
Examine the fuel line system routing on page 26. Find the correct replacement fuel hose for your excavator. Verify the replacement hose matches the factory 1470mm length requirement. Order the corresponding hose clamps and fittings shown in the exploded view to complete the replacement.
Manual Section: Fuel Line p. 26Hydraulic fluid leaks heavily around the main tank suction port connection points.
Check the hydraulic oil tank diagram on page 122. Identify the suction flange and associated O-rings. Confirm the required replacement suction flange features the correct 6mm thickness. Order the exact flange and mounting hardware listed to seal the hydraulic tank properly.
Manual Section: Hyd.Oil Tank p. 122Frequently Asked Questions
What are the replacement specifications for Hydraulic filter?
The replacement specifications for hydraulic filters include part number 172175-73700 for the RETURN filter assembly and part number 172146-73730 for the SUCTION filter. These parts are listed under the HYD.OIL TANK section. p. 122
What are the replacement specifications for Fuel filter?
The replacement specification for the fuel filter is part number 172183-14250. This part is listed under the FUEL TANK section of the manual. p. 25
How do you fix yanmar Vio27-5B engine won't start or starts intermittently due to a corroded main wiring harness?
Check the battery components exploded view on page 27. Identify the correct replacement wire harness assembly. Verify you need the specific harness with a 140mm length. Cross-reference the part number with your machine's serial number before ordering to ensure correct fitment. p. 27
How do you fix front track idler makes loud clunking noises and loses track tension during forward travel?
Inspect the idler and adjust assembly diagram on page 47. Locate the required replacement bush for the tensioner piston. Confirm the new bush matches the required 2mm thickness specification. Order the exact part number listed to rebuild the crawler spring assembly correctly. p. 47
What format is this manual in?
This is a 172-page searchable PDF 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.
Is this Yanmar Vio27-5B Parts Catalog printable?
Fully printable — the PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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