10
11
Engine Questions: Contact the engine manufacturer
’s authorized service center
.
Compressor Questions:
For service, contact the dealer from whom you
purchased the compressor
. T
o order parts, visit our website
“thomasairpac.com” or phone our customer service center at:
1-800-558-7721
.
Control V
alve Setting Instructions
The control valve is preset at the factory to load at 1
15 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 dif
ferential (the dif
ference between the load and unload pressure) is accomplished by holding the locknut (7/8” Hex) clos
-
est to the body of the valve, then turning the dif
ferential nut (3/4” Hex) very slightly
. T
urn clockwise to increase and counterclockwise to
decrease the dif
ferential.
TROUBLESHOOTING
SYMPT
OM
POSSIBLE CAUSE
REMEDY
Engine W
ont start
Out of Gas
Refuel
Oil level low
Add oil
Switch is of
f
Turn to ‘ON’
Fuel valve is of
f
Turn to ON’
Engine fl
ooded
Turn of
f choke, and pull starter until excess fuel is removed
Bad spark plug
Replace
No spark plug
Check spark across plug gap
Engine air fi
lter wet, clogged or dirty
Inspect and replace if necessary
, should be clean and dry
Defective low oil sensor switch
Check by disconnecting the wires of the sensor
. Seeauthorized
engine service center for repairs
Recoil starter pulls very hard
Air pressure in the tanks
Move hand unloader to ‘Unload’
positiion while starting
Compressor won’t build pres
-
sure
Air leak
Use a solution of soapy water to fi
nd leak
Hand unloader ins in ‘Unload’
position
Move to ‘Load’
position
W
orn piston cup and/or sleeve
Remove head and valveplate to inspect, replace if needed
Broken flapper valve
Remove head and valveplate to inspect, replace if needed
Engine won’t return to high speed
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
Safety valve blows open an
-
dengine won’t return to idle
Control valve set incorrectly
With compressor running, adjust control valve byloosening the 91
16” hex while holding the 5/8” jam hex.Loosen slowly - 1/8 turn
at a time
Compressor slow to recover
Air leak
Use a solution of soapy water to fi
nd leak
Engine run speed too low
Turn run speed adjustment screw (CCW) - See engine manual
Control valve set incorrectly
Refer to Control V
alve section for instructions to set correctly
Throttle cable out of adjustment
Adjust throttle cable by removing the attachment screw andturning the attachment clip (clip is threaded)
W
orn piston cup and/or sleeve
Remove head and valveplate to inspect, replace if needed
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
Compressor recovers fast
Control valve set incorrectly
Refer to Control V
alve section for instructions to set correctly
Air tanks full of water
Drain water out of tanks
Throttle cable out of adjustment
Adjust throttle cable by removing the attachment screw andturning the attachment clip (clip is threaded)
Excessive vibration
Engine speed out of adjustment
Adjust run speed to 3450 rpm +1- 150 rpm
Adjust idle speed to 2200 +1- 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 andturning the attachment clip (clip is threaded)
Loose engine bolts
Tighten bolts that connect engine to baseplate of tank
Engine quits
Oil level low
Add oil
Too much oil in engine
Place on level surface, chwck oil level, drain if necessary
Engine idle speed too low
Turn idle speed adjustment screw (CW) to 2200 +1- rpm
Resistance in throttle control
Clean and lubricate the cable casing and control cylinder
Resistance in throttle linkage
Clean and lubricate the cable casing and control cylinder
Incorrect cut-in/cut-out pres
-
sure
Control valve set incorrectly
Refer to Control V
alve section for instructions to set correctly
Spark plugs wet/fouled
Engine idle speed too low
Turn idle speed adjustment screw (CW) to 2200 +/- rpm
Engine run with choke on
Set choke to run position when engine is running
