Description

Daewoo M-150 Service Manual – Power Steering Pump Section 6B

You ever try to rebuild a power steering pump using a generic aftermarket guide that says “tighten to spec” without listing the actual spec? I have. It’s a waste of time and a good way to blow the seals on the first turn. The Daewoo M-150 Service Manual is an OEM document, 56 pages thick, dedicated to Section 6B – Power Steering Pump. That’s all it does. No padding, no fluff, just the factory procedure for the Daewoo M-150 BL2 bus. If you’re a home garage guy or a shop tech who values your billable hours, this is the reference that keeps you from chasing ghosts.

Description and Operation: Know What You’re Dealing With

Page 6B-2 covers the remote reservoir setup and the pressure-relief valve inside the flow control valve. That valve is what limits pump pressure so you don’t pop a line when the steering bottoms out. The manual tells you exactly how the pump works before you touch a wrench. I’ve seen plenty of DIY guys skip this page and then wonder why the pump whines after a rebuild. Read it. It’s two paragraphs and saves you an hour of head-scratching.

Diagnostic Information and Procedures: Stop Guessing

Foaming fluid? Low pressure? Growling noise? Page 6B-3 gives you a table of probable causes and corrections. For example, “Foaming, Milky Power Steering Fluid” – check fluid level, then bleed the system. If that doesn’t fix it, the flow control valve might be stuck. The manual says replace the pump at that point – cheap insurance compared to a core that’s scored. It also lists contamination in the fluid, internal leaks, and housing cracks. You get a straight diagnostic path, not a fishing expedition. Check out the Daewoo M-150 BL2 Service Manual for the full set of sections if you need engine or drivetrain info.

Repair Instructions: On-Vehicle and Unit Repair

Starting on page 6B-4, the manual walks through pump drive belt adjustment, pulley removal, and pump assembly replacement. Then page 6B-7 covers unit repair – disassembling the pump itself. Each step is numbered and referenced with the correct tool from the Special Tools table on page 6B-9. I’ve done this job without the factory procedure and ended up putting a belt on backward. The manual tells you the belt routing and the tension measurement. Don’t skip the torque specs on the mounting bolts – page 6B-8 lists them separately. For wiring or dash electronics, pair this with the Daewoo M-150 BL2 Service Manual Wiring System.

Specifications: Torque Values You Can Trust

General specs on page 6B-8 include fluid capacity, pump displacement, and pressure relief setting. Fastener tightening specs are listed in lb-ft – no metric conversion guesswork. I’ve seen aftermarket manuals give a generic “8-12 ft-lb” range that works for nothing. This one gives you the exact value for each bolt: pump mounting bracket, pulley nut, reservoir bracket. Use a calibrated torque wrench. Burnt threads cost more than the manual.

Special Tools and Equipment: Don’t Improvise

Page 6B-9 has a table of special tools like the pulley puller and seal installer. The manual gives the OEM tool numbers so you can order the right one or find a cross-reference. Trying to pull a pressed-on pulley with a generic claw puller will bend the shaft. I’ve seen it. For broader bus knowledge, the Daewoo Musso Service Manual – Factory OEM Specs for 1465-Page Workbench covers the Musso chassis, which shares some steering components.

Audience Fit: Who Needs This Manual?

If you’re maintaining a fleet of Daewoo M-150 buses for a church, school, or small transit company, this manual is your daily driver. Home mechanics who bought a surplus M-150 for conversion projects – you need this to understand the steering system before you hack into it. Even experienced techs who’ve done a hundred Saginaw pumps will find value in the factory diagnostic table. It’s one section, 56 pages, but it covers everything that matters for the power steering pump. The Internal Combustion Engine and Manual Transmission are separate knowledge areas – this manual stays focused on steering.

Source Validity: OEM vs. Aftermarket

I don’t trust aftermarket documentation for anything critical. Third-party reprints often miss revision levels, delete pages, or use low-resolution scans that make torque specs unreadable. This manual is the original Daewoo file, direct from the publisher. The file name DAEWOO_M-150_Service_Manual_en-22009014408.pdf confirms it’s the English version with the full 56-page content. No missing sections, no edited tables. You get what the dealer tech had on the bench.

Does this manual cover the entire bus or just the power steering pump?

It covers Section 6B only – the power steering pump. That’s 56 pages of dedicated content. For other systems (engine, transmission, brakes), you need the full multi-section Daewoo M-150 Service Manual.

Are the torque specs in imperial units?

Yes. All fastener tightening specifications are listed in lb-ft on page 6B-8. The manual was published for the North American market, so no metric conversion needed.

This is the kind of document you keep within arm’s reach of the workbench. When a customer drops off a bus with a leaking pump, you pull the spec, check the diagnostic table, and get the right tool. No second-guessing. Access the Factory Manual and put it to work.