Craftsman 921.165720 Owner's Manual page 18

PROBLEM
Regulated
pressure
gauge reading
drops when
air accessow
is being used
CAUSE
This is normal
Compressor not
large enough
Pressure relief Tank pressure
valve opens exceeded normal
operating pressure
Pressure switch stuck
Motor will Tank pressure exceeds
not run preset pressure switch
limit
Make sure the Thermal
Overload Switch has not
tripped. The motor has
a built in thermal cut out
that trips when necessaw
to protect the motor
from damage when
overheated.
Fuse blown or circuit
breaker tripped
CORRECTION
If pressure drops too low, adjust
regulator while accessow is used.
Check air requirement of accessory.
If it is higher than CFM and pressure
supplied by compressor, you need a
larger compressor. Most accessories
are rated at 25% of actual CFM
while running continuously.
Replace pressure switch
Replace pressure switch
Motor will start automatically when
tank pressure drops below cut- in
3ressure of pressure tank.
To reset the motor overload toggle
turn the Power Switch to the OFF
3osition and unplug the unit from
the power outlet. Allow 10 minutes
(minimum) for motor overload cut-
out to cool and reset. Unit can then
be plugged in and re-started.
• Replace blown fuse or reset circuit
breaker. Do not use fuse or circuit
breaker with higher rating than
specified for your branch circuit.
Check for proper fuse; "Fusetron"
type T is acceptable.
Check for low voltage and
proper extension cord size.
Disconnect other applications
from circuit. Operate compressor
on a dedicated circuit.
Check valve stuck open Remove and clean or replace.
Wrong wire gauge in cord Check for proper gauge and extension
or excessive extension cord length.
cord length
Loose electrical Contact authorized service center.
connections
Paint spray on internal Have checked at service center. Do
motor parts not operate compressor in the paint
spray area
Possible defective motor Have checked at service center.
18- ENG