Need the factory part numbers for your 1997-2002 Yanmar B50-2B or B37-2(EP) crawler excavator? This 147-page parts catalog (OEM #Y00S3671) is the official illustrated reference for both machines. Open it and you get exploded assembly views across every major system: engine mounts, radiator, fuel line, hydraulic pump, control valves, drive and turning motors, swivel joint, boom and arm cylinders, cab and canopy fittings, and the full hydraulic piping layout from tank through valve to motor. Each view maps individual components to factory part numbers with cross-references so you confirm the right piece before you order. The cabin electrical section nails down specifics like the 24V-6W work lamp bulb and 5A cartridge fuse rating. Wrong part delivered is a week wasted. Bookmarked by system; search any assembly name and pull the correct part number in seconds.
What's Inside This Yanmar B50-2B, B37-2(EP) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Label (Cabin) | 0-0 | Cabin Labels, Safety Labels, Warning Decals, Identification Plates |
| Label (Canopy) | 0-0 | Canopy Labels, Safety Decals, Warning Labels, Identification Plates |
| Muffler | 0-0 | Exhaust Muffler, Muffler Assembly, Exhaust Parts, Heat Shield |
| Air Cleaner | 0-0 | Air Filter Element, Air Cleaner Assembly, Pre-Cleaner, Filter Housing |
| Accelerator | 0-0 | Throttle Cable, Accelerator Lever, Engine Speed Control, Throttle Assembly |
| Engine Mount | 0-0 | Engine Mounting Bracket, Anti-Vibration Mount, Engine Support, Mount Bolts |
| Radiator & Mount | 0-0 | Radiator Assembly, Cooling Fan, Radiator Hose, Coolant System Parts |
| Fuel Tank & Fuel Line | 0-0 | Fuel Tank Assembly, Fuel Filter, Fuel Hose, Fuel Cap, Sediment Bowl |
| Battery | 0-0 | Battery Cable, Battery Hold-Down, Terminal Clamp, Battery Tray |
| Electric Part (Cabin, Canopy) | 0-0 | Wiring Harness, Fuse Box, Relay, Switch Panel, Connector |
| Electric Part (Cabin Spec.) | 0-0 | Cabin-Spec Wiring, Special Electrical Parts, Cabin Switches, Instrument Panel |
| Work Lamp | 0-0 | Work Light Assembly, Lamp Bracket, Bulb, Wiring Harness |
| Heater & Defroster | 0-0 | Cabin Heater Assembly, Defroster Blower, Heater Core, Control Valve |
| Roller & Adjust | 0-0 | Track Roller, Carrier Roller, Track Adjuster, Recoil Spring, Grease Cylinder |
| Crawler | 0-0 | Track Link, Track Shoe, Master Pin, Track Assembly, Grouser |
| Control Equipment (Lever & Stand) | 0-0 | Control Lever, Lever Stand, Pilot Valve, Joystick Assembly |
| Control Equipment (Drive) | 0-0 | Drive Lever, Travel Pedal, Drive Control, Pilot Pressure |
| Control Equipment (Swing) | 0-0 | Swing Lever, Swing Control, Swing Lock Pin |
| Control Equipment (Blade) | 0-0 | Blade Control Lever, Blade Valve, Blade Cylinder Control |
| Control Equip. (Cut Off Lever &) | 0-0 | Safety Lever, Cut-Off Valve, Safety Lock, Emergency Stop |
| Control Equip. (P.T.O. Control) | 0-0 | PTO Control Lever, PTO Valve, Power Take-Off Control |
| Frame & Turning Bearing | 0-0 | Upper Frame, Lower Frame, Swing Bearing, Slewing Ring, Frame Assembly |
| Frame Cover | 0-0 | Body Cover Panel, Engine Hood, Side Cover, Access Cover |
| Step & Instrument Panel | 0-0 | Step Assembly, Instrument Panel, Gauge Cluster, Monitor Display |
| Seat Mount | 0-0 | Operator Seat, Seat Bracket, Seat Suspension, Armrest |
| Bonnet | 0-0 | Engine Bonnet, Hood Assembly, Latch, Hinge |
| Cabin (Body & Fitting) | 0-0 | Cabin Structure, Body Panel, Fitting Hardware, Door Frame |
| Cabin (Glass & Sash) | 0-0 | Front Glass, Side Glass, Sash Frame, Weatherstrip, Wiper |
| Cabin Door | 0-0 | Cab Door Assembly, Door Hinge, Door Latch, Lock Cylinder |
| Canopy | 0-0 | ROPS Canopy, Canopy Support, Overhead Guard, Canopy Frame |
| Hyd. Oil Pump & Joint | 0-0 | Hydraulic Pump, Pump Coupling, Pump Drive, Suction Strainer, Pressure Port |
| Boom Cylinder | 0-0 | Boom Hydraulic Cylinder, Cylinder Rod, Seal Kit, Piston |
| Arm Cylinder | 0-0 | Arm Hydraulic Cylinder, Cylinder Rod, Seal Kit, Piston |
| Bucket Cylinder | 0-0 | Bucket Hydraulic Cylinder, Cylinder Rod, Seal Kit, Piston |
| Swing Cylinder | 0-0 | Swing Hydraulic Cylinder, Cylinder Rod, Seal Kit, Piston |
| Blade Cylinder | 0-0 | Blade Hydraulic Cylinder, Cylinder Rod, Seal Kit, Piston |
| Driving Motor | 0-0 | Travel Motor, Track Drive Motor, Hydraulic Motor, Reduction Gearbox |
| Turning Motor | 0-0 | Swing Motor, Slewing Motor, Hydraulic Swing Motor, Swing Reduction |
| Swivel Joint | 0-0 | Center Swivel Joint, Rotary Joint, Swivel Body, Port Block |
| Control Valve (P Port & V. Stand) | 0-0 | Main Control Valve, Pressure Port, Valve Stand, Inlet Port |
| Control V (Drive & P.T.O.) | 0-0 | Drive Control Valve, PTO Valve Section, Travel Valve |
| Control V (Arm & Swing) | 0-0 | Arm Control Valve Section, Swing Valve Section, Spool |
| Control V (Boom & Bucket) | 0-0 | Boom Valve Section, Bucket Valve Section, Relief Valve |
| Control V (Turning & Blade) | 0-0 | Turning Valve Section, Blade Valve Section, Spool Assembly |
| Remote Control Valve (L) | 0-0 | Left Pilot Valve, Remote Control Valve, Joystick Pilot Pressure |
| Remote Control Valve (R) | 0-0 | Right Pilot Valve, Remote Control Valve, Joystick Pilot Pressure |
| Low-High Valve | 0-0 | Two-Speed Valve, Travel Speed Control Valve, High-Low Selector |
| P.T.O. Valve | 0-0 | Power Take-Off Valve, PTO Hydraulic Valve, Attachment Valve |
| Hyd. Oil Tank | 0-0 | Hydraulic Oil Tank, Filler Cap, Suction Strainer, Return Filter |
| Hyd. Oil Piping (Tank-Pump-Valve) | 0-0 | Hydraulic Hose, Tank to Pump Line, Pressure Hose, Fitting |
| Hyd. Oil Piping (Valve-Motor, Boo0) | 0-0 | Boom Hydraulic Hose, Valve to Actuator Line, High-Pressure Hose |
| Hyd. Oil Piping (Valve-Swivel, Sw) | 0-0 | Swivel Hydraulic Hose, Swing Motor Hose, Swivel Port Piping |
| Hyd. Oil Piping (Return) | 0-0 | Return Line Hose, Low-Pressure Return, Filter Bypass |
| P.T.O. Hyd. Oil Piping (Frame) | 0-0 | PTO Frame Piping, Attachment Hydraulic Line, Frame Hose Routing |
| Hyd. Oil Piping (Track Frame) | 0-0 | Track Frame Hydraulic Hose, Travel Motor Feed Line, Undercarriage Piping |
| Hyd. Oil Piping (Boom) | 0-0 | Boom Arm Piping, Cylinder Feed Hose, Boom Circuit |
| Hyd. Oil Piping (P.T.O. Valve, Bo) | 0-0 | PTO Valve Boom Hose, Attachment Circuit Piping |
| Control Piping (Pump-Low-High V) | 0-0 | Pilot Control Piping, Pump Control Lines, Low-High Speed Circuit |
| Control Piping | 0-0 | Pilot Hose, Remote Control Piping, Pressure Reducing Valve Lines |
| Greasing | 0-0 | Grease Nipple, Greasing Points, Lubrication Fittings, Grease Piping |
| Boom & Boom Bracket | 0-0 | Boom Assembly, Boom Pin, Boom Bracket, Boom Foot |
| Arm & Bucket Link | 0-0 | Arm Assembly, Bucket Linkage, Coupler, Pin & Bushing, Bucket Tooth |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wiring label text | LABEL SET | p. 12 |
| Fuse (Cartridge) Rating | 5A | p. 30 |
| Bulb (Work Lamp) Rating | 24V-6W | p. 30 |
| Bulb (Room Lamp) Rating | 12V-5W | p. 33 |
Yanmar B50-2B, B37-2(EP) Common Problems This Manual Covers
Yanmar B50-2B missing warning decals and unreadable start switch indicator labels on the operator dashboard p. 12
Inspect the dashboard area for degraded decals. Verify exact replacement text using the label diagram on page 12. Order the LABEL, START SWITCH or the complete LABEL SET to restore accurate control identification. Replace any burnt out 12V-5W room lamp bulbs using the reference on page 33.
Manual Section: Picturesque Indx(3) Figure 01-12Cannot identify correct replacement part numbers for leaking swivel joint and control valve assemblies p. 3
Check the hydraulic section index on page 3 to locate your specific valve assembly. Match your visual components to the exploded views. Verify the exact seal kits before sourcing rebuilt replacements. Match exterior replacement panels with Yanmar New Permanent Yellow paint using the list on page 5.
Manual Section: Picturesque Indx(2) Hydraulic SectionBlown cartridge fuses in the main electrical box with missing amperage rating covers p. 30
Inspect the main electrical box and remove the damaged components. Match the circuit to the correct cartridge fuse rating on page 30. Install exact 5A replacement fuses to prevent harness damage. Order exact replacement covers using the main parts index on page 2.
Manual Section: Picturesque Indx(1) Main PartsHidden deterioration on engine bay cooling lines and unreadable oil water indicator decals p. 12
Remove the engine covers to access the cooling system. Match worn radiator hoses to the exploded views in the parts catalog. Order the specific LABEL, OIL/WATER decal shown on page 12. Verify all 24V-6W work lamp bulbs on page 30 while inspecting the bay.
Manual Section: Picturesque Indx(3) Figure 01-12Frequently Asked Questions
How do you fix yanmar B50-2B missing warning decals and unreadable start switch indicator labels on the operator dashboard?
Inspect the dashboard area for degraded decals. Verify exact replacement text using the label diagram on page 12. Order the LABEL, START SWITCH or the complete LABEL SET to restore accurate control identification. Replace any burnt out 12V-5W room lamp bulbs using the reference on page 33.
How do you fix cannot identify correct replacement part numbers for leaking swivel joint and control valve assemblies?
Check the hydraulic section index on page 3 to locate your specific valve assembly. Match your visual components to the exploded views. Verify the exact seal kits before sourcing rebuilt replacements. Match exterior replacement panels with Yanmar New Permanent Yellow paint using the list on page 5.
How do you fix blown cartridge fuses in the main electrical box with missing amperage rating covers?
Inspect the main electrical box and remove the damaged components. Match the circuit to the correct cartridge fuse rating on page 30. Install exact 5A replacement fuses to prevent harness damage. Order exact replacement covers using the main parts index on page 2.
How do you fix hidden deterioration on engine bay cooling lines and unreadable oil water indicator decals?
Remove the engine covers to access the cooling system. Match worn radiator hoses to the exploded views in the parts catalog. Order the specific LABEL, OIL/WATER decal shown on page 12. Verify all 24V-6W work lamp bulbs on page 30 while inspecting the bay.
Is this Yanmar B50-2B, B37-2(EP) Parts Catalog a digital download?
A 147-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is this Yanmar B50-2B, B37-2(EP) Parts Catalog printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy text throughout. The text is crisp and consistently easy to read on all pages. Diagrams and illustrations are clear line drawings, and all labels are readable. The pages are clean with no notable scan artifacts, stains, marks, or skewed content. There are no blank or filler pages present in the document.
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