TM 5-4310-343-35
Trouble
Probable Cause
Remedy
Inability of compres-
Broken spline.
Check spline condition.
sor unit to turn over
Worn motor brushes.
Replace brushes.
or reach speed.
Faulty electrical con-
Check condition of
(continued)
nections.
wiring.
NOTE
This portion of table 4-1 applies to Bogue Electric Model
6703 compressor.
Trouble
Probable cause
Remedy
Motor fails to start.
Loose connections and/or open
Check all wiring for continuity.
wiring.
Defective timer K2.
Check timer for correct operation.
Contact must be closed when 28
VDC is applied across terminals 1
and 9. See figure 6-11(1). Replace
a defective timer.
Defective relay K1 contacts.
Check for continuity across terminal
2 and 8. See figure 6-11(1).
If open replace K1.
Defective Contactor K3.
Check for open coil on
contactor. Continuity across
terminals A1 and A2 should be obtained
when 28 VDC is
applied across K3 coil terminals X1 and
X2. See figure 6-11(1).
Defective diode.
Check CR1 and CR3 for open
diodes See figure 6-11(1).
Replace if defective.
Defective motor.
If 27 VDC is available across
brush terminals, check that brushes are
not worn excessively (para. 4-4).
Replace worn brushes (para. 4-5).
Sticking brushes.
Check that brushes are free to
move in each respective brush holder
and brush spring apply proper tension,
Open motor field coils.
Check field coils for opens or
shorts (para 5-6.6). Repair or replace
coils a required.
Open armature.
Check armature for opens and
grounds (para 5-6.5). Repair
replace armature.
Defective pressure.
Verify that normally open
contacts of K4 are not closed. Replace
pressure switch if defective. See figure
Motor-compressor operating pressure
Leaky piping.
Check all pipe fittings for leaks.
fails to build up.
Compressor fails to maintain its
Defective pressure switch.
Replace K4.
preset on-off cycle, tat is, 30
minutes ON, 10 seconds OFF.
Motor attempts start then stops.
Weak field.
Check field coil for open winding
required.
Excessive brush sparking.
Commutator dirty.
Clean commutator (para 4-6).
Clean and reset brushes (para 4-5).
4-8
