15
309508
Spin Test
Setup
Electric Shock Hazard;
page 9.
To check armature, motor winding and brush electrical
continuity:
1.
Relieve pressure
;
page 9.
2.
Remove drive housing, page 20.
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 21.
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 15.
3.
If still uneven or no resistance, replace motor,
page 21.
9578A
Fig. 2
F
G
39
Motor Brush Replacement
Motor Brush Removal
Replace brushes worn to less than 1/2 in. Check both
sides. Brush Repair Kit 245914.
1.
Read General Repair Information, page 9.
2.
Relieve pressure
;
page 9.
3.
Fig. 3. Remove four screws (18) and motor
shroud (74).
4.
Pry off brush cap (A).
5.
Fig. 5. Remove screw (C) and discard brush (B).
(Continued on page 16)
TI0053
A
74
Fig. 3
18
Summary of Contents for 249166
Page 23: ...23 309508 Notes ...
