TM 5-4310-356-14
Table 5-1. Troubleshooting (Cont'd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
f. Tighten motor mounting bolts securely.
Step 3.
Check electric motor, compressor cooling fins and belt guard for poor ventilation.
Remove any dirt, trash or other foreign matter away from the compressor with an air
hose.
4. ELECTRIC MOTOR NOISY
Step 1.
Check to see if electric motor mounting bolts are loose.
Tighten mounting bolts and check the belt tension.
Step 2.
Electric motor bearings may be worn. If the noise is coming from inside the motor, disassemble the
motor and determine if bearings are worn.
a. Disconnect main power source.
b. Remove attaching hardware and remove V-belt guard.
c. Loosen motor mounting bolts, slide motor forward towards compressor and remove
V-belts.
d. Tag and disconnect electric leads.
5-3 as a guide.
(1) Remove setscrew (1), pulley (2), and key (3).
(2) Remove four bolts (4), rear endbell (5), spring (6), rear bearing (12), baffle (8), front
endbell (7), shim (9), front bearing (19), fan (14), rotor and shaft (13), and stator
(15).
WARNING
Dry cleaning solvent P-D-680, used to clean parts is potentially dangerous to personnel and
property. Use in a well ventilated area as the fumes are dangerous if inhaled. Do not use near
open flame or excessive heat. Flash point of solvent is 100 . -138 . (380C. -59 . ).
F
F
C
(3) Clean all parts except rotor, bearings and stator in dry cleaning solvent P-D-680
and wipe dry with a lint free cloth.
(4) Use compressed air to clean dust and dirt off rotor, bearings, and stator, then
wipe with a cloth dampened in dry cleaning solvent P-D-680.
(5) Inspect bearings for excessive wear. Replace defective bearings.
(6) Replace stator (15) in frame. Replace rotor and shaft (13), fan (14), front bearing
(10), shim (9), front endbell (10), baffle (8), rear bearing (12), spring (6), rear endbell (5),
and four bolts (4).
(7) Replace key (3) in shaft, pulley (2) on shaft, and replace the setscrew (1).
f. Mount electric motor on compressor and replace mounting bolts.
g. Connect electrical leads.
h. To adjust the belts, move the motor away from the compressor until there is tension
on the 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 be sure pulley alinement is maintained.
i.
Tighten motor mount ing bolts securely.
5. ELECTRIC MOTOR DOES NOT CUT IN AT 165 PSI (11.60 kgs), AND CUT OUT AT 190 PSI (13.36kgs).
Step 1.
Check incoming power source for disconnection. Connect air compressor to incoming power source.
Step 2.
Check pressure switch for proper setting.
a. Start the air compressor to determine adjustment. The pressure switch is preset by
manufacturer at 165 psi (11.60 kgs) CUT-IN, and 190 psi (13.36 kgs) CUT-OUT setting. If
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