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 |
|---|---|---|
| Reference Materials | 2-6 | Preface, Parts Catalog History, Vehicle Painted Color (Paint Part No.) |
| Label(Cabin) | 11-12 | Support, Crawler, Lock, Spec Us, F/W Lower Us, Engine Room |
| Label(Canopy) | 13-14 | Support, Lock, Spec Us, Engine Room, Yanmar, Specification |
| Safety Label(Cabin) | 15 | Label, Support, Engine Room, Window Us, Pinus |
| Safety Label(Canopy) | 16 | Label, Support, Engine Room, Pinus, Finger |
| Repair Parts | 17 | Sponge, Seal, Dam |
| Muffler & Air Cleaner | 18 | Tube Assy, Exhaust, Muffler Assy, Cleaner Assy, Air, Element, Gasket, Silencer |
| Accelerator | 19 | Cable, Bracket, Lever, Grip, Joint, Pin |
| Engine Mount | 20 | Absorber, Shock, Bracket Assy, Mount, Engine, Plate, Stopper |
| Radiator Shuraud | 21-22 | - |
| Radiator & Sub-Tank | 23 | - |
| Duct | 24 | - |
| Fuel Tank | 25 | - |
| Fuel Line | 26 | - |
| Battery | 27 | - |
| Electric Part(Around Engine) | 28 | - |
| Electric Part(Around Frame) | 29 | - |
| Electric Part(Starting Switch) | 30 | Switch Assy, Starter, Cylinder Assy, Key, Cord Assy, Cover, Key Assy |
| Electric Part(Around Seat) | 31 | Band, Harness Assy, Wire, Fuse, Socket Assy, Relay, Safety, Timer |
| Electric Part(Travel Alarm) | 32 | Harness, Travel, Cover Assy, Buzzer, Switch, Pressure, Back |
| Electric Part(Work Lamp) | 33 | Harness Boom Lamp, Cover, Lamp, Work, Bulb, Harness |
| Electric Part(Quick Copler : Switch Box) | 34 | Box, Switch, Label, Switch Assy, Lamp, Indicator, Screw |
| Heater(To M53438) | 35 | Hose Assy, Valve Assy, Duct Assy, Cushion, Bonnet |
| 119.(22A)Heater(From M53439) | 36 | Hose Assy, Heater, Valve Assy, Duct Assy, Cushion, Bonnet |
| Air Conditioner(Electric Part) | 37 | Harness, Air, Diode, Wire, Panel, Control, Resistor |
| Air Conditioner(Engine Related) | 38 | Pulley, Compressor Assy, V-Belt, Bracket Assy, Cover Belt, Plate Assy |
| Air Conditioner(Condenser Related) | 39 | Mount Pad, Bracket Radiator, Drier Receiver, Condenser Assy, Cover Assy, Plate |
| Air Conditioner(Cabin Related)(To M53438) | 40 | Mount Pad, Duct Assy, Sheet Insulator, Cushion Bonnet, Filter, Thermostat Assy |
| 120.(26A)Air Conditioner(Cabin Rerated)(From M53439) | 41 | Mount Pad, Duct Assy, Sheet Insulator, Cushion Bonnet, Filter, Thermostat Kit |
| Air Conditioner(Piping) | 42-43 | Bracket AC Assy, Pipe Water, Hose, O-Ring, Switch Pressure, Dren |
| Sprocket & Roller | 44 | Sprocket, Roller Truck, Shaft Roller, Seal, O-Ring, Bearing Ball |
| 123.(29A)Track Roller(K Spec.) | 45 | Roller Assy, Lower, Spacer, Shaft, Seal, O-Ring, Bearing Ball |
| Idler & Adjust | 46-47 | Idler Assy, Bush, Seal Floating, Spring Assy Crawler, Piston Assy Adjust, Valve Assy Nipple |
| Crawler | 48 | - |
| Control Equipment(Lock Lever & Stand : Right) | 49 | - |
| Control Equipment(Lock Lever & Stand : Left) | 50 | - |
| Control Equipment(Travel Lever) | 51 | - |
| Control Equipment(Blade Lever) | 52 | - |
| Control Equipment(Swing Pedal) | 53 | - |
| Control Equipment(Low-High Pedal) | 54 | - |
| Control Equipment(P.T.O. Pedal) | 55 | - |
| Armrest | 56 | - |
| Control Valve Plate | 57 | - |
| Cover(Link : P.T.O. Switch) | 58 | - |
| Turning Frame | 59 | - |
| Greasing | 60 | - |
| Track Frame & Turning Bearing | 61 | - |
| Cover(Frame) | 62-63 | - |
| Cover(Bonnet) | 64 | - |
| Step & Floor Mat | 65 | Cap, Clip, Step Assy, Sponge, Mat, Floor |
| Instrument Panel | 66 | Switch Assy, Monitor Assy, Panel, Instrument, Cap, Gasket |
| Seat Mount | 67-68 | Plate, Rubber, Mount Assy, Seat, Bush, Sponge |
| Seat & Handrail | 69 | Seat, Cushion, Rail Set, Belt, Plate, Handrail Assy |
| Bonnet(1) | 70 | Assy, Emblem Assy, Sponge, Rubber, Seal, Rod Assy, Stopper |
| Bonnet(2) | 71-72 | Plate Assy, Collar, Trim, Sponge, Stay |
| Window Washer | 73 | Harness, Washer, Tank Assy, Cap, Bracket, Plate |
| Cabin(Body) | 74 | Ashtray, Assy, Knob, Clutch, Run, Glass, Frame Assy, Lock Assy |
| Cabin(Glass) | 75-76 | Sash Assy, Washer, Bolt, Screw, Seal, Glass |
| Cabin(Accessory) | 77 | Plate Assy, Rubber, Spacer, Seal, Roof, Sunroof, Glass |
| Cabin(Electric Part) | 78 | Harness, Wire, Motor, Wiper, Hose, Grommet, Lamp, Bulb |
| Cabin Door(Front) | 79 | Door Assy, Washer, Key Assy, Cylinder, Cover, Striker Assy, Seal, Latch |
| Cabin Door(Rear) | 80 | - |
| Cabin(Cover)(To M53438) | 81 | - |
| 121.(59A)Cabin(Cover)(From M53439) | 82 | - |
| Cabin(Fitting) | 83 | - |
| Rearview Mirror | 84 | - |
| Canopy | 85 | - |
| Hyd.Oil Pump & Joint(Quick Coupler Spec.) | 86-87 | - |
| 118.(63A)Hyd.Oil Pump & Joint(Without Quick Coupler Spec.) | 88-89 | Pump Assy, Barrel Kit, Cylinder, Block Assy, Valve, Coupling |
| Boom Cylinder | 90-91 | - |
| Arm Cylinder | 92 | - |
| Bucket Cylinder(Y Spec.) | 93 | - |
| 124.(66A)Bucket Cylinder(K Spec.) | 94 | Cylinder Assy, Bt, Piston Assy, Rod Assy, Seal Kit, Guide |
| Swing Cylinder | 95 | - |
| Blade Cylinder | 96 | - |
| Hitch Cylinder(Quick Coupler) | 97 | - |
| Travel Motor | 98-99 | - |
| Turning Motor | 100 | - |
| Swivel Joint(Y Spec.)(To M54434) | 101 | - |
| 122.(72A)Swivel Joint(N Spec.)(From M54435) | 102 | - |
| Control Valve(Sg:1/7) | 103-104 | - |
| Control Valve(Sg:2/7) | 105 | Section, Boom, Spool Assy, Valve, Reverse, Spring |
| Control Valve(Sg:3/7) | 106 | Valve, Spool Assy, Inlet, Spring, Piston, Cover, Pilot |
| Control Valve(Sg:4/7) | 107 | Anti-Cavitation, Section, Swing, Spool Assy, Valve, Reverse, Cap |
| Control Valve(Sg:5/7) | 108 | Section, Arm, Spool Assy, Valve, Reverse, Spring |
| Control Valve(Sg:6/7) | 109 | Section, Swing, Spool Assy, Valve, Reverse, Spring |
| Control Valve(Sg:7/7) | 110 | Valve, Plug, Body, 4WAY Kit, O-Ring, Bolt, Washer |
| Control Valve(Us,As,Nz:1/7) | 111-112 | Valve Assy, Control, Gasket Set, Section, Bucket, Reverse, Spring |
| Control Valve(Us,As,Nz:2/7) | 113 | Section, Boom, Spool Assy, Valve, Reverse, Spring |
| Control Valve(Us,As,Nz:3/7) | 114 | Valve, O-Ring, Inlet Section Sub, Spool Assy, Piston, Cover, Pilot |
| Control Valve(Us,As,Nz:4/7) | 115 | Anti-Cavitation, Section, Swing, Wiper, Dust, Valve, Spool Assy |
| Control Valve(Us,As,Nz:5/7) | 116 | Section, Arm, Valve, Reverse, Spool Assy, O-Ring, Cover, Pilot |
| Control Valve(Us,As,Nz:6/7) | 117 | Section, Swing, Valve, Spool Assy, Throttle, Cover, Pilot |
| Control Valve(Us,As,Nz:7/7) | 118 | Valve, Plug, Body, 2-Way Kit, O-Ring, Cover Assy, End |
| Way Multi Lever(Us,As,Nz) | 119 | Label, 2-Way, Multi V Lever Assy, Spring, Lever Assy, Shaft, Knob Assy |
| Way Multi Lever(Sg) | 120 | Lavel, Multilever, Label, 4 Way, Multi V Lever Assy, Spring, Lever Assy, Magnet |
| Remote Control Valve | 121 | Valve Assy, Boot, Lever Kit, Handle, Cardan Kit, Regulation Kit |
| Hyd.Oil Tank | 122-123 | - |
| Hyd.Oil Piping(Tank - Pump - Control Valve) | 124 | - |
| Hyd.Oil Piping(Control Valve - Turning Motor) | 125 | - |
| Hyd.Oil Piping(Control Valve : Fitting) | 126 | - |
| Hyd.Oil Piping(Control Valve - Boom, Swing) | 127 | Hyd.oil Piping(control Valve - Boom, Swing) |
| Hyd.Oil Piping(Control Valve - Boom Cylinder) | 128 | - |
| Hyd.Oil Piping(Control Valve - Swivel Joint) | 129 | - |
| Hyd.Oil Piping(Track Frame) | 130 | - |
| Hyd.Oil Piping(Boom) | 131 | - |
| Hyd.Oil Piping(P.T.O. : Solenoid Valve - Control Valve) | 132-133 | Bracket Assy, Valve Assy, Solenoid, O-Ring, Adapter, Hose |
| 100.Hyd.Oil Piping(P.T.O. : Control Valve - Boom) | 134 | Valve Assy, O-Ring, Nipple, Connector Assy, Hose, Clamp |
| 101.Hyd.Oil Piping(P.T.O. : Boom - Arm End) | 135 | Washer, Valve, Adapter, Tube Assy, Hose, Clamp |
| 102.Hyd.Oil Piping(Quick Coupler) | 136 | Tube, Adapter, O-Ring, Connector Assy, Hose, Clamp |
| 103.Accumulator | 137 | Accumulator, Clamp, Bracket, Connector Assy, O-Ring, Hose |
| 104.Control Piping | 138 | Adapter, O-Ring, Connector, Clamp, Hose, Joint |
| 105.Boom Backet | 139 | Shim, Bracket, Bush, Pin, Ring, Bolt |
| 106.Boom | 140-141 | Boom Assy, Seal, Dust, Bush, Pin Assy, Pipe Assy |
| 107.Arm | 142 | Arm Assy, Seal, Dust, Bush, Pin Assy, Nipple, Grease B |
| 108.Bucket Arm & Link | 143 | Arm, Bucket, Pin Assy, Link, Seal, Dust, Bush |
| 109.Bucket | 144 | Pin Kit, Bucket, Bucket Assy, Cutter, Side, Tooth Kit, Point, Pin Assy |
| 110.Quick Coupler | 145-146 | O-Ring, Bracket, Pin, Bolt, Plate, Lock, Guard Assy |
| 111.Blade | 147 | Blade Assy, Bush, Seal, Dust, Pin, Plate, Lock, Nipple |
| 112.Holding Valve Kit(1)(Optional) | 148 | Valve Kit, Holding, Cover, Sponge, Guide Assy, Hose, Plate Assy |
| 113.Holding Valve Kit(2)(Optional) | 149 | Hold Valve, Boom &Arm, O-Ring, Plug, Piston, Connector Assy, Bracket Assy, Boom K |
| 114.Holding Valve Kit(3)(Optional) | 150 | Hold Valve, BOOM&ARM, O-Ring, Plug, Spring, Piston, Bracket Assy, Arm K |
| 115.Holding Valve Kit(4)(Optional) | 151 | Adapter, Nipple, Elbow, Adjustable, O-Ring, Hose, Clamp |
| 116.Holding Valve Kit(5)(Optional) | 152 | Band, Nipple, Connector, O-Ring, Hose, Clamp |
| 117.Label(Franch for Canada)(Optional) | 153-154 | - |
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. p. 27
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: BatteryFront track idler makes loud clunking noises and loses track tension during forward travel. p. 47
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 & AdjustMain boom cylinder drifts downward slowly when control levers are in the neutral position. p. 90
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 CylinderEngine runs hot and starves for fuel because of a cracked or leaking main supply line. p. 26
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 LineHydraulic fluid leaks heavily around the main tank suction port connection points. p. 122
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 TankFrequently 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.
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.
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.
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.
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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