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Setup
Electric Shock Hazard; page 6.
To check armature, motor winding and brush electrical
continuity:
1.
Relieve pressure; page 6.
2. Remove drive housing; page 21.
3. Fig. 2. Remove pressure control cover (39). Dis-
connect motor leads (F) and (G).
4. Fig. 3. Remove motor shroud (74).
Armature Short Circuit Test
Quickly turn motor fan by hand. If no electrical shorts,
motor coasts two or three revolutions before complete
stop. If motor does not spin freely, armature is
shorted. Replace motor; page 22.
Motor Brush Replacement
Motor Brush Removal
Replace brushes worn to less than 1/2 in. Check both
sides. Order Brush Repair Kit 243215 for motor with
external capacitor. Order Brush Repair Kit 245894 for
motor without external capacitor.
1. Read General Repair Information; page 6.
2.
Relieve pressure; page 6.
3. Fig. 3. Remove four screws (18) and motor
shroud (74).
4. Pry off two brush caps (A). Tag locations of red (+)
and black (–) motor leads.
5. Fig. 5. Remove screw (C) and discard brush (B)
for motor with capacitor attached. Remove brush
lead from control box for motor without capacitor
attached.
(Continued on page 13)
309063
12
Spin Test
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
1. Connect red and black motor leads together with
test lead. Turn motor fan by hand at about two
revolutions per second.
2. If uneven or no resistance, check for: broken brush
springs, brush leads, motor leads; loose brush
terminal screws, motor lead terminals; worn
brushes. Repair as needed; page 12.
3. If still uneven or no resistance, replace motor;
page 22.
39
Fig. 2
74
Fig. 3
F
G
18
A
9578A
TI0053
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