Sullair 1600 compressor high pressure fluctuates

by David

Hi bill

I have a Sullair 1600AF compressor with a cat c15 engine and have Ia strange problem...

The machine is dual pressure and when loading the machine the starts and loads fine the engine rpm is good and also when manually revving the machine it's doing the right thing

The problem I'm having is when I open the delivery tap the engine goes
Up to correct RPM and discharges good pressure but then drops down to a idle rpm but still produces some air

I've checked air filters - not blocked
I've checked air control pilot system orifices not blocked
I've check minimum pressure vavle - fine
Changed fuel filters

I'm sure it's a compressor side problem not the engine

Please help


Comments for Sullair 1600 compressor high pressure fluctuates

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Nov 25, 2015
Fluctuating pressure
by: Nich ( CAT tech)

Check primary switch at top of after cooled filters. Should read a difference of 0 to 10 PSI. Go to P1-P3 on compass controller. Should read "OK". You can jump out the primary switch by removing the two air lines on either side of the filters, and just plug up the holes.

Apr 17, 2014
1600 partial shutdown
by: Doug in

Differential shutdown system for filters?

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