750AF Cat eng speed too low

by Terry Hess
(Mineral Wells Texas USA)

Have a 750AF CAT. Min idle speed 1400 rpms rated speed 1800 rpms. Compressor will start and idle at about 1450 rpms, 115 psi computer says 100% load at 71 psi for fuel. I go to open a valve to put it under load if I open the valve slowly I can get it about 1/3 of the way open rpms clim to almost 1500 then start to drop off while maintaining 110 psi till it gets below 1000 rpms then cuts off due to engine speed to low. Any idea on what might cause this issue?

Comments for 750AF Cat eng speed too low

Click here to add your own comments

Apr 26, 2018
750AF speed too low
by: Doug in s.d.ca.

Clogged fuel filter? Bad fuel? Pump going bad?

Please let us know if you have checked all of these.

Click here to add your own comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Sullair Air Compressor Issues.