9308842
Spin Test
Setup
Electric Shock Hazard; page 3.
To check armature, motor winding and brush electrical
continuity:
1.
Relieve pressure; page 3.
2. Remove drive housing; page 15.
3. Fig. 3. Remove pressure control cover (82). Dis-
connect motor leads (F) and (G).
4. Fig. 4. Remove motor shield (54), fan cover (A)
and inspection covers (B).
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.
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 9.
3. If still uneven or no resistance, replace motor;
page 16.
Fig. 3
G
82
F
8051A
Motor Brush Replacement
NOTE: Replace brushes worn to less than 1/2 in.
Brushes wear differently on each side of motor,
check both sides. Brush Repair Kit 220853 is
available. Spring clip, 110816, may be
purchased separately.
Motor Brush Removal
1. Read General Repair Information; page 3.
2.
Relieve pressure; page 3.
3. Fig. 4. Remove motor shield (54). Remove in-
spection covers (B) and gaskets on each side of
motor.
(Continued on page 10)
A
B
54
Fig. 4
7703B
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