Komatsu WB91R-2 / WB93R-2 Backhoe Loader Service Manual

Comprehensive repair and service manual for Komatsu WB91R-2 and WB93R-2 Backhoe Loaders. Includes diagrams, specifications, and procedures.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Komatsu Models Covered & Key Technical Specifications

Models: Komatsu WB91R-2, Komatsu WB93R-2
Sub-models / Variants: Backhoe-Loader, Avance
Serial Numbers: WB91R-2 91F20145 and up, WB93R-2 93F23453 and up
Technical Data:

  • Transmission type: 4-speed forward and reverse with electrically-controlled selector
  • Steering unit type: LAGCSDS160P
  • Steering displacement: 160 cc/rev
  • Shovel dump relief pressure: 230 bar
  • Boom safety valve pressure: 350 bar
  • Arm safety valve pressure: 230 bar
  • Engine oil (crankcase) capacity: 7.9 liters
  • Hydraulic circuit capacity: 150 liters (specified), 92 liters (refill)
  • Fuel tank capacity: 130 liters
  • Front axle differential capacity: 6.5 liters
  • Rear axle differential capacity: 14.5 liters
Technical Specifications
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Document Number / Seller:
31585 / Donna Lee
File Size:
14.93 MB
File Type:
PDF
Language:
English
Pages:
504
Printable:
Yes
Category:
Backhoe Loader
Last updated / verified
Jul 15, 2025

Komatsu Manual Features & Content Preview

Komatsu WB91R-2 and WB93R-2 Service Coverage

  • Covers 1990s–2000s Komatsu WB91R-2 and WB93R-2 Avance series backhoe loaders with specific serial number identification starting from 91F20145 and 93F23453
  • Official Komatsu Utility shop manual, publication WEBM000404
  • Contains 504 pages of technical diagrams, system descriptions, and component specifications
  • Stored against your account so you can retrieve it after a hard-drive loss
  • Indexed PDF search covers every chapter and appendix
  • what an OEM service publication covers
  • This factory publication is the primary technical reference for the WB91R-2 and WB93R-2 Avance backhoe loader drivetrain, hydraulic systems, and structural assemblies

Component and System Documentation

The Komatsu WB91R-2 and WB93R-2 service manual provides technical insight into the machine structure and functional operation of major assemblies. The documentation details the power train, including transmission internals and gear selector logic, alongside comprehensive descriptions of the front and rear axle planetary systems. The section on hydraulic components covers the variable-flow pump, control valve blocks for both shovel and backhoe functions, and the Closed Center Load Sensing System (CLSS). Technical material also outlines the operation of safety valves, brake pumps, and the air-conditioning unit.

Hydraulic and Mechanical Specifications

Technical data is provided through numerous reference tables detailing standard tightening torques for bolts, nuts, and flared pipe fittings, ensuring maintenance adheres to factory standards. The document includes fluid capacity charts for engine, transmission, and hydraulic reservoirs across various ambient temperatures. Specification sections detail pressure thresholds for PC and LS valves, alongside electrical wire color coding and thickness parameters for diagnosing harness issues. This 504-page Komatsu OEM technical manual supports owners and technicians servicing the WB91R-2 and WB93R-2 Avance series by documenting engine, chassis, hydraulics, and drive system specifications for these specific model serial ranges.

Document Reference: WEBM000404

Manual FAQ, Purchase & Download Details

Does this shop manual provide coverage for the WB91R-2 and WB93R-2 series models? keyboard_arrow_down

Document covers the Komatsu WB91R-2 and WB93R-2 backhoe loader models. The content is tailored for these specific machines, referencing their serial number ranges and technical requirements.

What primary chapters and technical categories are included in the document structure? keyboard_arrow_down

Manual is organized into major chapters covering structure and function, testing and adjusting, disassembly and assembly, and maintenance standards.

Which fluid capacity charts and lubricant specifications are available for reference in this guide? keyboard_arrow_down

Technical documentation includes a table of oil and coolant quantities that lists the reservoir, the kind of fluid required, and capacity values for both specified and refill amounts. It also references ambient temperature guidelines and API or SAE standards for proper fluid selection. This data acts as a reference for identifying the correct types and volumes for the machine.

Can I find standard tightening torque tables or coating material specifications for various components within this manual? keyboard_arrow_down

Manual contains comprehensive charts for standard tightening torques of bolts and nuts, as well as listings for recommended coating materials and their specific applications.

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