Description

Komatsu D155AX-5 2001 Workshop Manual – OEM Factory Specs for the D155AX-5

If you’re turning wrenches on a Komatsu D155AX-5 2001 Workshop Manual and you don’t have the factory documentation in your hand, you’re working blind. I’ve seen guys torque a main bearing cap to aftermarket numbers and end up with a spun bearing inside six hours. That’s not a repair bill – that’s a fire drill. This manual is the same binder the dealer techs use. 296 pages, printed in Japan, revision marks included. Every spec in it came off Komatsu’s engineering floor.

TOC Breakdown: What’s Inside This 296-Page Manual

Six major sections, each built for a specific phase of the job. 01 GENERAL covers safety, lubrication chart, and machine identification. 10 STRUCTURE AND FUNCTION walks you through every hydraulic circuit, power train component, and control linkage – page 10-1 onward. 20 TESTING AND ADJUSTING gives you the procedures for checking pressures, temperatures, and speeds against factory limits. 30 DISASSEMBLY AND ASSEMBLY is the step-by-step breakdown of final drives, steering clutches, and the blade tilt system. 40 MAINTENANCE STANDARD lists wear limits for bushings, seals, and bearings. 90 OTHERS covers special tools and torques for attachments. That’s the full bread-and-butter content for a dozer that’ll set you back six figures to replace.

Testing and Adjusting: The Section That Keeps You Out of Trouble

This is where the manual earns its keep. If you’re dealing with a steering clutch that won’t release or a blade that drifts, you go to page 20-1. The torque values on that page are not suggestions. I’ve watched a guy guess the main control valve bolt torque on a D155AX-5 because he lost his paper manual. That cost the shop two days and a hydraulic pump rebuild. The factory spec for the charge pressure relief valve setting is right there in the text – no flipping through third-party PDFs that mis-copied the values. You get the test port locations, the pressure gauge range, and the adjustment sequence in plain language. Follow it exactly and you don’t burn a weekend chasing ghosts.

3 Reasons to Trust OEM Documentation Over Aftermarket

First, revision marks. This manual includes a list of revised pages with markers like ‡ (replace) and fi (add). Aftermarket reprints copy the base text but miss the updates. Second, the serial number match. It covers D155AX-5 machines from 70001 and up – no guesswork about which version. Third, the drawings. Section 10 has exploded views of the torque converter and transmission that are scaled correctly. Aftermarket scans usually distort the dimensions. You can’t measure a shim thickness from a blurry repro. This is the real thing.

Does the Manual Cover the SA6D140E-2 Engine?

Yes, but with a catch. The D155AX-5 mounts either the SA6D140E-2 or SA6D140E-3 engine. This workshop manual covers the dozer chassis systems – hydraulics, undercarriage, steering, blade control. For engine internal work (pistons, liners, cylinder head torque) Komatsu explicitly states on page 00-1: see the 6D140-2 or 140-3 Series Engine Shop Manual. That document is sold separately. So if you’re pulling the engine, you’ll want the companion manual. For everything else – final drives, power shift transmission, steering clutches – this manual has the complete disassembly sequence and the wear limits in the Maintenance Standard section.

Get the Torque Specs From Section 20 Before You Start

Don’t rely on a sticky note you wrote in 2018. The testing and adjusting section includes fastener torque tables for the entire power train: track frame bolts, sprocket retaining nuts, pivot shaft capscrews. Every value is in foot-pounds and newton-meters. Page 20-1 has the charge pressure test procedure; page 20-15 covers the brake valve adjustment. If you’re rebuilding the steering clutch, you need the clearance measurements from section 40. The manual tells you what tool to use (Komatsu special tool numbers are listed) and what the tolerance is. No room for interpretation.

40 Maintenance Standard – What You Check Before a Job

This section is the backbone of any preventative overhaul. It lists acceptable wear for everything from track link pitch to hydraulic cylinder rod bend. If you’re inspecting a used machine before purchase, section 40 gives you the pass/fail numbers. For example, the final drive gear backlash spec is in there, and the procedure to measure it without pulling the sprocket. Pair this with the Komatsu D155AX-5 2001 Service Manual if you need a second copy for the field, and grab the KOMATSU D155AX-5 Bulldozer Operator Manual for daily checks. For the electrical side, the Komatsu D155AX-5 Bulldozer Operation and Maintenance Man covers routine fluid changes. Beyond the dozer itself, you might need the Manual Transmission specs from the engine shop manual, but that’s outside this document. The Manual Transmission manual for the SA6D140 series is a separate purchase – Komatsu’s cross-reference table points you to it.

FAQ

Does this manual include wiring diagrams?

Yes, section 10 covers them.

Is the engine rebuild procedure included?

This manual focuses on the D155AX-5 dozer systems: final drives, steering, hydraulics, blade control. Engine internal specs (pistons, liners, cylinder head torque) are not covered – Komatsu directs you to the separate 6D140-2 or 140-3 engine shop manual. For testing engine-related items like fuel injection timing or turbo boost pressure, the testing and adjusting section does include those procedures. If you need a full engine teardown, buy the engine manual as well.

If you need to get this dozer back in the dirt without guesswork, access the factory manual here.