Description

Bomag BW 141, BW 142, BW 172, BW 172 D, BW 142 PD 1987 Repair Manual

I’ve lost count of how many times a job went sideways because someone grabbed a generic aftermarket manual and trusted the torque values printed in it. That mistake costs you a cracked axle housing or a hydraulic leak that takes half a day to chase. For the Bomag single-drum rollers — Bomag BW 141, BW 142, BW 172, BW 172 D, BW 142 PD 1987 Repair Manual — you need the factory document. Not a scan, not a reprint. This is the original 589-page binder from 1987, the same one sitting on a German service supervisor’s desk when these rollers were still new.

Skip the aftermarket trash. Page 2 of this manual states clearly: use only ORIGINAL BOMAG spare parts. That same page tells you this document covers training, trouble-shooting, and repair. Every section is written in English, German, French, and Spanish — but the specs are what matter. Need the torque for the axle bolts? Section 01.05. Want to understand the Poclain compact motor with multi disc brake? Section 03.01.1. This isn’t a general guide. It’s a step-by-step factory procedure for these specific models.

Safety First: Section 01.02

Before you put a wrench on anything, read the safety notes. Page 1 of the manual (yes, the cover page) tells you the catalog number — 008 190 84/07.87. But the real content starts in section 01.02. Hydraulic and electric symbols are spelled out in sections 01.03 and 01.04. You don’t guess which valve is which. You look it up. I’ve seen guys blow a hose because they assumed the symbol matched another brand. That doesn’t happen when you use this manual.

Torques and Conversions: Section 01.05

Section 01.05 lists the torque values. Section 01.06 gives you a conversion table for metric and English measures. That matters when you’re working on an old German roller with mixed fasteners. The manual doesn’t say “tighten until it feels right.” It gives you numbers. If you’re rebuilding the axle, follow section 02.50. It walks you through removing and installing the axle, with special tools listed in section 02.53. Page 3 of the TOC shows the full breakdown: assembly sections 01 through 10, covering engine, axle, travel drive, vibratory system, steering, brakes, electric system, circuit diagrams, and optional equipment.

Axle Repair: Section 02.50 – 02.53.2

For the BW 142 PD and BW 172 D models, the axle is where most of the heavy work happens. Section 02.53.1 covers repairing the axle. The manual includes functional descriptions (section 03.01) of the travel drive, specifically the Poclain compact motor. If you’re chasing a vibration issue or a drive problem, you need the test points listed in section 01.11.1. This manual gives you connection surveys and overall views of test points for both single-amplitude and two-amplitude machines. That’s data you can’t get from a third-party PDF.

Troubleshooting the Diesel Engine: Section 02.01

Diesel engine trouble? Section 02.01 lays out the trouble-shooting procedure. You measure engine speed using the method in section 02.01.1. There’s a general description of the diesel engine in section 01.41, with important notes for trouble shooting and repair work. The manual takes you from diagnosing a no-start condition all the way to disassembling and installing the engine (section 02.31). Preparing the engine for travel is covered in 02.31.1. Then the axle again in 02.31.2 — because on these rollers, the engine and axle are tied together.

Why OEM Beats Aftermarket on These Bomag Rollers

Aftermarket manuals for construction equipment often skip the hydraulic symbols or use generic wiring diagrams. This one includes electric symbols (01.04) and circuit diagrams in section 08. You get the actual factory sequence for removing the travel drive motor (section 03.01.3) and the brake assembly. The manual even warns you that it’s not included in the updating service — meaning this is the definitive 1987 version. If you need updates, they refer you to the Technical Service Information publication. But for a full rebuild of a BW 141 or BW 172, this is the document you keep on the bench.

7 Systems Covered – What You Get in 589 Pages

Every major system on these rollers is broken down: 01 General, 02 Engine, 03 Axle, 04 Travel Drive, 05 Vibratory System, 06 Steering, 07 Brakes, 08 Electric System, 09 Circuit Diagrams, 10 Optional Equipment. That’s 10 assembly sections, but the TOC on page 3 lists them clearly. The manual is organized by assembly — you flip to the section relevant to the job. No searching through irrelevant chapters. Need to understand the braking system? Section 07. Want the wiring for the optional equipment? Section 10. It’s all there, from torque values to special tool numbers.

FAQ

Is this manual suitable for the BW 142 PD model?

Yes, it covers BW 142 PD specifically – see section 03.01.

Does it include hydraulic system diagrams?

Sections 01.03 and 01.04 cover hydraulic and electric symbols. The manual also includes overall views of connections with test points. That said, it’s a 1987 manual so some modern components may differ. But for the original Poclain motor and multi disc brake, it’s accurate. The hydraulic troubleshooting steps are detailed enough to trace pressure drops and valve issues. You won’t find that level of detail in a generic manual.

What about torque specs for the axle bolts?

Section 01.05 lists torques. Also a conversion table for metric and English measures.

Can I use this for troubleshooting the diesel engine?

Absolutely. Section 02.01 covers trouble shooting for diesel engine, including measuring engine speed. Step-by-step procedures with safety warnings.

If you’re working on any of these Bomag rollers — BW 141, BW 142, BW 172, BW 172 D, or BW 142 PD — stop wasting time with aftermarket garbage. Get the factory documentation that the mechanics at Bomag-MENCK GMBH put together in 1987. 589 pages of torque specs, wiring diagrams, axle repair procedures, and safety notes that are written for the actual machine on your shop floor. You won’t have to guess which bolt gets what pound-foot. You won’t chase a hydraulic leak because someone else’s manual skipped a symbol. This is the real deal. Access the Factory Manual now.