TM
5-4310-350-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(5) Inspect bearings for excessive wear. Replace defective bearings.
(6) Replace stator with frame (18) on bare (19) rotor (17) fan (16) spacer bearing (15)
opposite shaft end bearing (12) shaft end bearing (14) opposite shaft end, end shield (11) shaft
end, end shield (13) and four bolts (10).
(7) Replace key (7) in shaft pulley (6) on shaft, and replace the setscrew (5).
f. Mount electric motor on compressor and replace mounting bolts.
g. Connect electrical leads.
V-belts. Depress one of the V-belts midway between the pulley and flywheel; when the top lines up
with the bottom of the belt next to it under normal thumb pressure the tension is correct.
CAUTION
Do not adjust the V-belts too tightly as this will overload motor
and compressor bearings. Also check and he sure pulley aline-
ment is maintained.
i. Tighten motor mounting bolts securely.
5. ELECTRIC MOTOR DOES NOT CUT IN AT 140 PSI (9.84 kgs), AND CUT OUT AT 175 PSI
(12.30 kgs).
Step 1. Check incoming power source for disconnection. Connect air compressor to incoming power source.
Step 2. Check pressure switch for proper setting.
turer at 140 psi (9.84 kgs) CUT-IN, and 175 psi (12.30 kgs) CUT-OUT setting. If adjustment is
necessary shut off the outside power source.
b. Remove cover from pressure switch.
d. To decrease the difference between the CUT-IN and CUT-OUT pressure, turn the differential
screw counterclockwise (fig. 5-4).
CAUTION
When adjusting the differential screw, do not turn it farther
than it will turn easily.
e. To increase the differential and maintain the some CUT-OUT pressure, turn the differential
screw clockwise and, at the same time, turn the pressure adjusting screw counterclockwise.
NOTE
If the differential is increased only by turning the differential screw clockwise, and CUT-
IN pressure changes only slightly, and the CUT-OUT pressure rises.
f. Turn on the outside power source to check the adjustment. To check the CUT-IN pressure,
open the drain cock and allow air pressure to fall below 140 psi (9.84 kgs ). Close the drain cock
and the compressor should start immediately.
g. Install the covcr on the pressure switch.
Step 3. Check for defective pressure switch. If adjustment as outlined in Step 2 above does not help, repair
or replace the pressure switch.
a. Shut off outside power source.
b. Tag and disconnect aIl electrical leads.
C. Unsrew pressure switch assembly from air receiver.
WARNING
Dry cleaning solvent P-D-680, used to clean parts is potentially dangerous to personnel and
property. Do not use near open flame or excessive heat. Flash point of solvent is 100 F.
-- 138 F.
5-8
