TM
5-4310-350-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ELECTRIC MOTOR REVERSES
Step 1. Check motor leads for proper connection in magnetic starter box. If motor leads are not connected
properly, repair as follows:
a. Disconnect main power source.
b. Remove screw from bottom of magnetic starter box cover and remove the cover.
C. Look on the name plate on the motor to check the correct way the leads should be connected
into the magnetic starter box,
d. Connect the terminal lead from the motor marked T1 to the screw marked T1 in the magnetic
starter box. Follow the same procedure with terminal T2 and T3.
e. Replace the magnetic starter box and replace the cover screw.
f. Reconnect the main power source.
3. ELECTRIC MOTOR OVERHEATS
Step 1. Use a volt meter and check for low line voltage from power source.
If voltage is low from power source, connect to another power source,
Step 2. Check V-belts for out of alinement. Also make a visual inspection of belts and condition to determine
if the belts require removal for cleaning and deglazing. If deglazing appears necessary, remove the
lock belt guard.
a. Loosen motor mounting screws (fig. 5-4) securing motor to receiver. Move motor toward com-
pressor, then lift belts off of the pulley.
WARNING
Dry cleaning solvent. PD-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.
b. Use a cloth dampened in dry cleaning solvent P-D-680 to remove oil and dust film. If the
belts appear to have been saturated, and the heat has glazed the surfaces of the Vee's, proceed as
follows:
C. Use a medium grade of grit paper ( not emery cloth) and rough up the surfaces with strokes of
uneven direction.
NOTE
When installing new belts, never pry the belts over the pulley grooves.
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 aline-
ment is maintained.
f. Tighten motor mounting bolts securely.
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.
5-6
