OEM Bulletin
Subject
CLUTCH BURNISHING INSTRUCTIONS
Version
Document
Department
Revision Details
Author
Reviewed by
Implemented
Tech.
Eng.
Q/A
A
1901225
OEM
Document Release
RRP
DSB
PID
LPH
27APR2023
Page 1 of 1
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OVERVIEW
Prior to putting the system into service, the compressor clutch must be properly burnished. Burnishing is a
process that conditions the friction surface of the clutch to allow for efficient engagement and to prevent
slipping. This is achieved by wearing down the high points of the initial imperfect clutch surface, thus increasing
the contact surface area. Once a clutch surface has been burnished, the static torque will increase significantly.
If a clutch is unable to provide enough torque, it could start to slip and cause the clutch surface to overheat
which will damage the clutch. The following clutch burnishing procedure should be followed once the system is
installed but before the compressor is initially tested and put into service.
BURNISHING PROCEDURE
Wear appropriate Personal Protective Equipment and follow all industry standard safety
practices while performing this procedure.
1. Disconnect the clutch power wire at the clutch.
2. Connect a jumper wire between the clutch bullet connector and a 12V power source.
3. Ensure the clutch engages when energized. There should be a noticeable click as the plates contact.
4. Disconnect the jumper wire from the 12V power source.
5. Start the engine.
6. Connect the jumper wire to the 12V power source to engage clutch and spin up the compressor.
7. After about 1 second, disconnect the jumper wire.
8. Shut off the engine.
Flying debris will be blown out from the clutch during this step. Wear safety glasses, other
appropriate PPE, and follow all industry standard safety practices.
9. Using compressed air, blow the worn clutch material out of the clutch.
10. Repeat steps 5-9 ten times.
11. Shut off the engine.
12. Reconnect the clutch connector to the harness and remove the jumper wire.
13. The clutch is burnished and the system is ready for use.
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