Mercedes-Benz Air Conditioning Compressor/Clutch PDF Service Manual


CLUTCH HUB REMOVAL Remove clutch retaining ring or nut. Use a spanner wrench to prevent the hub plate from turning. 2. Attach the tool to the end plate by threading the outer nut of the tool into the center hole of the clutch end plate. 3. Tighten the inner tool arbor against the end of the compressor. Tech Tip: Proper air gap between the clutch pulley and hub armature is critical to compressor overall performance. Failure to maintain the proper spacing, as indicated in the mfgrs. specifications can lead to problems such as clutch burning or slippage. shaft to lift the plate.

CLUTCH HUB INSTALLATION 1. Position the shaft key in place. 2. Slide the clutch hub onto the shaft of the compressor. Be careful not to damage the components by using excess force. 3. Thread the inner part of the tool onto the shaft. Tighten the outer nut of the tool to push the shaft key in. 4. Set the air gap. Add or remove shims to obtain the mfg. specifications. Always set at the min. number and measure at multiple points around the circumference. 5. Reinstall the retaining ring or nut. 6. Check oil level and rotate the hub with the nose of the compressor down to help lubricate. You can checking compressor ratios is an excellent way to check system performance and possible failures. Run the vehicle at 1500 RPM and record both gauge readings then add 15PSI to your reading.

R-12 acceptable ratios are between 5 to 1and 6 to 1. R-134a acceptable ratios are between 6 to 1 and 7 to 1 If a systems exceeds these ratios the compressor may fail to high internal pressure on the pistons and swash plates. Possible causes of high ratios are refrigerant overcharges and air in the system. Recover /recharge, vacuum, and identify source of excess air. (Use refrigerant identifier to check equipment, 1. Hub/armature and rotor/pulley drive faces have oil or grease on them. a. Look for shaft seal leak and replace clutch b. Compressor leaking through the bolt. Repair leak source. 2. Check for missing or improperly installed snap ring. Repair or replace the clutch.

Field coil snap ring is wrong size. Measure thickness and refer to parts manual for correct size. Repair or replace clutch if damaged. Always check anti-rotation pin damage. Retaining ring should be facing away from the compressor, fully seated in groove, lug of ring should not be over the anti-rotation pin, and field ring tight against the compressor. 4. Check to ensure clutch components are matched correctly. The straight coil to straight rotor/ pulley and stepped coil to stepped rotor/pulley. Repair or replace if they don’t match. REPLACE IN PAIRS. Look for high pressures. Remember too much oil will cause slugging and low oil causes binding. Make sure you don’t have…

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