Wabco APU (932 500 series) Service Manual

An APU is the air processing unit on a heavy vehicle. It dries the compressed air and splits it between the brake circuits through the multi-circuit protection valve. When one acts up, the technician is the one who ends up with the unit on the bench or the truck on the lift. This service manual is for the person running the tests and making the adjustments in-house.

What this manual helps you do

• Follow the preparatory work steps before you start testing the unit
• Check the air dryer against the test procedure in the manual
• Verify multi-circuit protection valve operation with the documented test sequence
• Adjust the unit as the test and adjustment instructions describe
• Troubleshoot a unit that came in with no paperwork, using the title's test and adjustment instructions as your guide

Who this is for

Independent repair shops, fleet mechanics and dealer technicians who service APU units out of warranty. If you're testing and setting up the unit yourself, this is the book for it.

FAQ

Q: What do I receive and how is it organised?

A: You get the set: 2 PDF files, 79 pages in total, in English and German. Publication 9325009503 is the main manual at 40 pages, and Publication 815 000 498 3 adds 39 pages. The text is searchable and copyable.

Q: Which unit does it fit?

A: The Wabco APU (932 500 series). The main manual is publication number 9325009503, titled "APU Test and Adjustment Instructions."

Q: How does it fit the job I'm doing?

A: It's the complete service manual for this component. The sections run from safety and description through preparatory work to the air dryer test and the multi-circuit protection valve test, so you can work through the unit in order.

Print the test pages, keep them at the bench, and work the unit step by step.

Click here to view the preview (PDF)

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