Motor Brush Replacement - Graco 246737 Repair And Parts Manual

Setup
WARNING
Page 2
To check armature, motor winding and brush electrical
continuity:
WARNING
Page 2
1. Remove drive housing, page 18.
2. Fig. 2. Remove pressure control cover (39). Dis-
connect motor leads (F) and (G).
3. 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 19.
Motor Brush Removal
Replace brushes worn to less than 1/2 in. Check both
sides. Brush Repair Kit 245545.
1. Read General Repair Information, page 5.
WARNING
Page 2
1. Fig. 3. Remove four screws (22) and motor
shroud (74).
2. Pry off two brush caps (A). Tag locations of red (+)
and black (–) motor leads.
Spin Test

Motor Brush Replacement

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.
3. If still uneven or no resistance, replace motor,
page 19.
39
F
G
Fig. 2
3. Fig. 4. 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 12)
74
22
Fig. 3
A
TI0053
309860
9578A
11