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A/C compressor on a crane.

echeeves on Fri October 03, 2008 11:01 AM User is offline

Year: 2004
Make: Grove
Model: 530E
Engine Size: Big'un
Refrigerant Type: R134A
Ambient Temp: 80
Pressure Low: n/a
Pressure High: n/a
Country of Origin: United States

The compressor on this crane I believe is a zerex. it is turned by a hydraulic pump. the problem is that when you turn on the A/C the compressor turns very slow. the hyd. pump is not binding, you can turn it easily when the a/c is off. I plan on bringing my gauges from home and take a static reading, but have not done so yet.
Could you guys give me some direction on where to start troubleshooting? I sure would appreciate it. Thx.

HECAT on Fri October 03, 2008 11:55 AM User is offline

That would be a hydraulic motor. Depending on the type (gear, vane, geroler, gerotor, etc.) it may or may not turn free. I would confirm the operation of the hydraulic system and be sure there is not a pressure problem or motor wear on the hydraulic side; as this would cause the slow turn of the A/C compressor.


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echeeves on Fri October 03, 2008 12:00 PM User is offline

Thx Hecat. I will check into that first. It only has 300 hrs on the crane and some of that not in the summer, but you never can tell.

TRB on Fri October 03, 2008 12:05 PM User is offlineView users profile

Compressor is probably a Zexel which is basically the Seltec. They work best at about 1500 rpm but will work as low as 800 rpm.


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echeeves on Fri October 03, 2008 12:14 PM User is offline

zexel- I think that was it- was going by memory.... the guy that usually runs the crane said to look at it, isn't working. so I did, but only at idle. When I get time I will look at it with the rpm's in the correct range....thats good info, thanks!

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