Description

Komatsu WB93S-5 Workshop Manual – 658 Pages of Factory Specs

Aftermarket manuals will get you in trouble. I’ve seen guys torque a transmission housing bolt to 60 ft-lbs because some third-party PDF said so, then wonder why the case cracked. That doesn’t happen with the Komatsu WB93S-5 Workshop Manual. This is the same 658-page document the dealer techs use. It covers serial number F00003 and up. You get the actual OEM tightening torque specs, the real disassembly sequence, and the hydraulic circuit diagrams that match the machine on your shop floor. No guesswork.

Standard Tightening Torque – What You’ll Find on Page 5

Torque values live in the STANDARD TIGHTENING TORQUE section early in the manual. Page 5 lists the factory torque for every bolt class on the WB93S-5. Use that page before you touch any fastener. The manual also includes a CONVERSION TABLE so you can switch between ft-lb and Nm without reaching for your phone. I’ve seen technicians strip threads because they used a generic chart from a truck forum. Don’t be that guy.

Transmission (4WD) and Drive Shafts: Factory Disassembly

Two separate transmission chapters sit under GROUP 10 – STRUCTURE AND FUNCTION. TRANSMISSION (4WD) and TRANSMISSION cover every gear, clutch pack, and seal. The DRIVE SHAFTS section shows you how to pull the shafts without damaging the yokes. Each removal procedure lists the special tools you need. The manual doesn’t assume you have a Komatsu tool set; it tells you the tool number and gives you an alternative using standard sockets and pullers. That’s the difference between a factory manual and a generic guide.

Does This Manual Cover the CLSS Hydraulic System?

Yes, and it goes deep. The CLSS chapter has three subsections: DESCRIPTION, OPERATING PRINCIPLES, and OPERATION FOR EACH CIRCUIT AND VALVE. If you need to adjust the LS differential pressure or set the main relief valves, go to GROUP 20 – TESTING AND ADJUSTMENTS. Page numbers in that section run from 20-1 through 20-80. You’ll find CHECKING AND ADJUSTING THE LS DIFFERENTIAL PRESSURE. ADJUSTING THE LS VALVE is a separate procedure. I’ve used this to fix a backhoe that wouldn’t curl properly – the LS valve was off by 50 psi.

7 Testing and Adjustment Procedures for Hydraulic Pressure

The hydraulic circuit chapters cover both mechanical and servocontrol versions. You get the 8-SPOOL CONTROL VALVE and 10-SPOOL CONTROL VALVE diagrams for both. The manual walks you through CHECKING THE SETTING OF MAIN RELIEF AND SECONDARY VALVES, SETTING THE MAIN RELIEF VALVES AND THE REDUCING VALVES, and CHECKING AND ADJUSTING SERVOCONTROLS SUPPLY PRESSURE. Each procedure lists the required pressure gauge range and the test port location. No guessing.

Get the Valve Clearance Specs from the Komatsu Manual

Valve adjustment is under GROUP 20 – ADJUSTING VALVE CLEARANCE. The manual gives you the cold clearance for intake and exhaust valves on the engine. It also includes ENGINE SPEED TESTS and TENSIONING THE AIR-CONDITIONING COMPRESSOR BELT. If you’re rebuilding the backhoe cylinders, GROUP 30 has REMOVAL AND INSTALLATION procedures for each cylinder: BOOM CYLINDER, ARM, BUCKET CYLINDER, OUTRIGGER CYLINDER, BOOM SWING CYLINDER, JIG ARM CYLINDER. Page 30-1 starts the removal section.

Wiring diagrams live in GROUP 90. You get FUSE AND RELAY CENTRE, DRIVER SEAT WIRING, SWITCH PANEL WIRING, FRONT DASH WIRING, ROOF WIRING, ENGINE WIRING, SPEED SELECTOR WIRING, BACKHOE WIRING, 4WS PUSH-BUTTONS PANEL WIRING, 4WD SOLENOID VALVES WIRING, and the full WIRING DIAGRAM (STANDARD VERSION). That’s enough to troubleshoot any electrical fault without probing random wires.

This manual is a direct scan of the original Komatsu print. It’s not a reprint, not a compilation. Every page matches what you’d get from the dealer. The WEIGHT TABLE tells you how much each component weighs so you don’t drop an axle on your foot. The TABLE OF OIL AND COOLANT QUANTITIES gives you exact fill amounts in quarts and gallons. I’ve been turning wrenches for 28 years. This is the kind of documentation I keep on the workbench, not on a tablet that dies halfway through a job.

If you work on other Komatsu models, check these related manuals:

• Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual
• Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual
• Komatsu PW95R-2 Workshop Manual – 520 Pages of Factory Specs

For a general understanding of transmissions, see Manual Transmission. For the broader automotive industry context, read Automotive Industry Overview.

Frequently Asked Questions

Does this manual include wiring diagrams?

Yes, Group 90 has the full wiring diagram.

What torque specs are included?

The STANDARD TIGHTENING TORQUE section (page 5) covers all fastener grades used on the WB93S-5. Additionally, each component chapter lists specific torque values for critical joints like transmission bolts, axle flange nuts, and cylinder rod ends. The manual also includes a CONVERSION TABLE for ft-lb to Nm. If you need the torque for the valve cover bolts, it’s in the ADJUSTING VALVE CLEARANCE procedure. This is not a generic chart – it’s the exact spec Komatsu stamped on the production line. I’ve used it to torque a front axle housing on a WB93S-5 and it sealed perfectly the first time.

Is the CLSS hydraulic system explained?

Three subsections: Description, Operating Principles, Operation for Each Circuit and Valve.

Can I use this manual for a WB93S-5 with serial number lower than F00003?

It covers from F00003 and up.

Stop guessing. Buy this manual and access the factory manual now. You’ll have the torque specs, the transmission disassembly steps, and the valve adjustment figures at your fingertips. No more scrolling through forum posts.