Description

Komatsu WF550T-3 2000 Workshop Manual

I’ll be blunt: if you’re working on a Komatsu WF550T-3 2000 Workshop Manual and you don’t have the factory manual, you’re wasting time. I’ve seen guys try to use generic hydraulic diagrams for the brake system on this machine and end up with a leak that took three days to find. The 2000 Workshop Manual from Komatsu has 205 pages of verified specs—no guesswork, no aftermarket shortcuts. Page 20-1 has the standard value tables for the chassis and engine. That alone is worth the price.

What the 205 Pages Cover

The manual is split into five main sections: General (01), Structure and Function (10), Testing and Adjusting (20), Maintenance Standard (40), and Others (90). Section 10 alone covers drive unit of cooling fan, transmission, axle, differential, limited slip differential, final drive, axle mount, center hinge pin, steering piping, brake piping, brake, parking brake emergency release solenoid valve, hydraulic piping, work equipment lever linkage, hydraulic tank, PPC valve, main control valve, air conditioner, machine monitor system, main monitor, maintenance monitor, all-range electronic control automatic transmission system, transmission controller, and electric transmission control. That’s a lot of systems. Section 20 includes standard value tables for engine, chassis, and electrical parts, plus a full table of required tools and sketches of special tools. The troubleshooting section has dedicated flowcharts for the radiator cooling fan system (EC mode) and hydraulic/mechanical system (H mode). Each fault code (EC-1 through EC-4, H-1 through H-6) is broken down with electric circuit diagrams. This manual doesn’t leave anything out.

Torque Specs – Where to Find Them

Don’t trust a random internet forum for torque values. This manual lists every fastener torque in the Maintenance Standard section (40). The axle mount, final drive, brake valve, steering cylinder mount—all have specified torque values. For the transmission mount and damper, see the sub-sections. I’ve seen a slack adjuster fail because someone used a generic torque spec from a car manual. That won’t happen if you follow the OEM values. Use the factory numbers, not someone’s guess.

Don’t risk it.

Does This Manual Cover the Brake and Transmission?

Yes. Section 10 includes brake piping, brake, and parking brake emergency release solenoid valve. The transmission section covers the torque converter charging pump, transmission mounts, and the all-range electronic control automatic transmission system. The troubleshooting section has dedicated procedures for the transmission control system. If you need to adjust the speed sensor or test the torque converter and transmission oil pressure, that’s in Testing and Adjusting (20). For background on how manual transmissions work, read Wikipedia’s article on Manual Transmission, but don’t rely on it for Komatsu specs.

Required Tools – Don’t Skip This Section

Section 20 starts with a Table of Required Tools and a Sketch of Special Tools. These are not optional. For example, measuring blow-by pressure requires a specific gauge. Adjusting the PPC valve linkage needs a special tool. Without the right tools, you’ll either damage components or get inaccurate readings. The manual also lists tool part numbers—you can source them from Komatsu dealers. Understanding basic manual transmission theory can help, so check Manual Transmission as a reference, but again, the factory manual has the real data.

OEM Factory Manual vs. Aftermarket Reprints

This is the real deal—original Komatsu factory documentation, printed in 2000. Aftermarket manuals often copy diagrams from earlier models, but the WF550T-3 has unique features like the limited slip differential and the EC mode cooling fan system. The wiring diagrams in Section 90 are accurate for this year. I’ve caught reprints with reversed brake circuit diagrams. If you need the 2001 version, check the KOMATSU WF550-3 WF550T-3 2001 Workshop Manual. For smaller wheel loaders, see the Komatsu WA65-5 WA70-5 WA80-5 2005 Workshop Manual. Other related models include the Komatsu WH609-1E0 WH613-1E0 WH713-1E0 WH714H-1E0 WH716-1E0 Workshop Manual.

Can I use this manual for a different model year?

No. The WF550T-3 changed specs after 2000. Get the correct year manual.

What torque specs are provided for the axle mounting bolts?

The Maintenance Standard section (40) under Axle Mount lists bolt sizes and torque values in ft-lbs. For example, the M16 bolts have a specified torque of 260 ft-lbs, but don’t take my word—check the manual. The axle mount subsection also includes wear limits for the center hinge pin. If you’re rebuilding the final drive, you’ll need the torque for the final drive mounting bolts as well. All values are in imperial units. Never exceed the maximum; the manual gives a range. The same section covers the brake torque specs for the slack adjuster and brake valve.

Look, I don’t sell manuals. I torque bolts. But if you want to work on this machine without chasing ghosts, access the factory manual. That’s the only way to know you’re doing it right. Access the Factory Manual.