Description

Daewoo BUS 21612 Service Manual – What It Saves You

You’ve got a Daewoo BUS 21612 in the bay, and some aftermarket PDF told you “tighten to spec” without giving a number. That’s how you get crushed seals, pulled threads, and a comeback that eats your Saturday. This Service Manual is the original OEM factory print – 329 pages of what Daewoo BUS put together for their own technicians. No third-party rehash, no guesswork. That’s the point.

Transmission Overhaul: What This Manual Covers

Section 3 is dedicated to the Transmission. That means disassembly, clearance checks, bearing preload – the kind of data you don’t get from a generic sheet. The factory procedure tells you exactly where to measure and what tool to use. You’ll also find the propeller shaft section (Section 4) and rear axle specs in Section 5. All linked to the same vehicle. If you’ve ever fought a bus transmission that whines after a rebuild because the pinion depth was off, you know why this matters.

Does the Brake Section Include Torque Specs?

Yes. Section 8 – Brake – covers air brake systems, slack adjuster installation, and chamber fastener torque. The manual lists factory values, not “tighten until it feels right.” Page 36 has the oil viscosity chart for the compressor and air dryer if you’re doing a full service. Use genuine Daewoobus parts, as noted in the repair instructions on page 2. They know the metallurgy. You should too.

3 Critical Systems: Engine, Suspension, and Steering

The Engine isn’t a separate section, but Section 1 includes engine identification (engine number location, V.I.N. plate) and main data on page 9. The Suspension section (Section 9) covers leaf springs, air suspension, and shock absorber mounting. Steering (Section 7) gives you gear adjustment specs and pitman arm torque. If you’re pulling a steering box on a 21612 without factory numbers, you’re gambling with front-end alignment. This manual kills the gamble.

Use the Factory Lubrication Chart

Section 1’s lubrication section (page 36–39) gives you an oil viscosity chart, a recommended lubricant list, and a lubrication chart. Bus chassis have multiple grease points – steering linkage, spring pins, clutch release bearing. The chart maps every point with the correct Daewoo BUS spec. Grab that page before you start slapping any grease in there.

Propeller Shaft and Rear Axle: Factory Procedures

Section 4 (Propeller) and Section 5 (Rear Axle) cover driveshaft runout limits, flange torque, and differential overhaul. These are heavy components – a mistake on the rear axle pinion nut can cost you a complete carrier. The manual shows the step‑by‑step removal and installation, including the required tool list. Don’t carve these procedures out of a third‑party manual. Use the real thing.

Source Validity – OEM vs Aftermarket

This file is a direct factory scan from Daewoo BUS – not a compiled notes version. Aftermarket manuals often misprint torque values or skip safety warnings like “disconnect the battery ground cable before removing the transmission.” This OEM manual includes those warnings word-for-word from the original SM-1E-0505. If you’re a DIY mechanic working on a bus at home, or a shop owner who doesn’t want liability from a missed step, this is the only source you should trust.

Related Manuals You Might Need

• Daewoo BUS DV11, DL08, DL06 2008 Parts Catalog – OEM Factory”>Daewoo BUS DV11, DL08, DL06 2008 Parts Catalog – OEM Factory
• Daewoo BUS DV11 DL08 GE12TI GE08TI 2004 Parts Catalog”>Daewoo BUS DV11 DL08 GE12TI GE08TI 2004 Parts Catalog
• Daewoo BUS BH120F 2009 Parts Catalog – OEM Factory Specs”>Daewoo BUS BH120F 2009 Parts Catalog – OEM Factory Specs

External References

For background on how four‑stroke diesels work, see Internal Combustion Engine”>Internal Combustion Engine. For gear train basics, check Manual Transmission”>Manual Transmission.

Frequently Asked Questions

Does this manual cover the engine in detail?

The engine section appears under General Information with engine number location and main data on page 9. Full engine overhaul is not in this chassis manual – that requires the separate engine service manual.

What torque values are listed for the brake system?

Section 8 includes torque specs for brake chamber mounting bolts, slack adjuster fasteners, and wheel cylinder retainer nuts. These are factory values, not estimates. You’ll also find the air system pressure settings. Always check the brake section before reassembly – a caliper that backs off on a bus is a lawsuit waiting to happen.

Is this the same manual that Daewoo dealerships used?

Yes. This is the OEM service manual for the 21612 chassis, part number SM-1E-0505. The same document Daewoo BUS issued to their technicians. No omissions, no rewrites.

Can I use this for a different bus model?

Only if the chassis is a 21612. Other Daewoo bus models (e.g., BH120F) have different axle and suspension configurations. Use model-specific manuals only.

Stop wasting billable hours hunting specs. This is the same data a dealership tech uses – original Daewoo BUS engineering. Access the Factory Manual and keep it on your workbench, not buried in a folder.