check the air gap at the front of the compressor. if it is out of spec, it will cut off. on mine the clutch plate bearing is going bad and the clutch plate air gap is crocked and not a .50 mm gap all around. this is causing the shut off on mine.

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification