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For service contact the dealer from whom you purchased the compressor. To order parts visit our website, www.thomasairpac.com or
call our Customer Service Center at 1-800-848-7735.
Control Valve Setting Instructions
The control valve is preset at the factory to load at 115 psi and unload at 135 psi and should not require adjustment.
If adjustment is necessary, the unload pressure is adjusted by slightly turning the pressure adjusting nut (9/16” Hex) while holding the
locking nut (5/8” Hex). Turn clockwise to increase and counterclockwise to decrease the unload pressure.
Changing the differential (the difference between the load and unload pressure) is accomplished by holding the locknut (7/8” Hex) closest
to the body of the valve, then turning the differential nut (3/4” Hex) very slightly. Turn clockwise to increase and counterclockwise to
decrease the differential.
Excessive vibration Engine speed out of adjustment
Adjust run speed to 3450 rpm +/- 150 rpm
Adjust idle speed to 2200 rpm +/- 150 rpm
Resistance in throttle control Clean and lubricate the cable casing and control cylinder
Resistance in throttle linkage Loosen friction nut on the throttle linkage of the engine
Throttle cable out of adjustment
Adjust throttle cable by removing the attachment screw and turning
the attachment clip (clip is threaded)
Loose engine bolts Thighten bolts that connect engine to base plate of tank
Engine quits
Oil level low Add oil
Too much oil in engine Place on level surface, check oil level, drain if necessary
Engine idle speed too low Adjust idle speed to 2200 rpm +/- 150 rpm
Resistance in throttle control Clean and lubricate the cable casing and control cylinder
Resistance in throttle linkage Loosen friction nut on the throttle linkage of the engine
Incorrect cut-in/cut-out pressure Control valve set incorrectly Refer to Control Valve section of instructions to set correctly
Spark plugs wet or fouled
Engine idle speed too low Adjust idle speed to 2200 rpm +/- 150 rpm
Engine run with choke on Set choke to run position when engine is running
Engine idles for long periods
Increase idle speed to 2200 rpm +/- 150 rpm or replace spark plug
with a spark plug that is one heat range “otter”- see authorized
engine service center
Engine speed uctuates Engine is running out of fuel Refuel
