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Setup
Electric Shock Hazard; page 4.
To check armature, motor winding and brush electrical
continuity:
1.
Relieve pressure; page 4.
2. Remove drive housing; page 15.
3. Fig. 3. Remove pressure control cover (39).
Disconnect motor leads (F) and (G).
4. Fig. 4. Remove motor shroud (74) and inspection
covers (A).
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 16.
Motor Brush Replacement
Motor Brush Removal
Replace brushes worn to less than 1/2 in. Brushes
wear differently on each side of motor, check both
sides. Brush Repair Kit 236967 is available. Spring
clip, 112766, may be purchased separately.
1. Read General Repair Information; page 4.
2.
Relieve pressure; page 4.
3. Fig. 4. Remove motor shroud (74) and two
inspection covers (A).
(Continued on page 11)
10
824191
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 10.
3. If still uneven or no resistance, replace motor;
page 16.
39
Fig. 3
Fig. 4
F
G
74
A
9578A
7703B
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