Spin Test; Motor Brush Replacement - Graco T-Max 405 A Series Repair Manual

Setup
Electric Shock Hazard; page 3.
To check armature, motor winding and brush electrical
continuity:
1.
Relieve pressure; page 4.
2. Remove motor, page 13.
3. Fig. 3. Remove six screws (12) and motor
cover (18).
4. Fig. 2. Disconnect wire harness (155) from control
board.
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 13.
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
1. Connect wire harness (155) leads together with
test lead (A). Turn motor fan by hand at about two
revolutions per second.
Motor Brush Removal
Replace brushes worn to less than 1/2 in. Check both
sides. Order Brush Repair Kit 243642 for 220 – 240
Vac motors and 243215 for 100 – 120 Vac motors with
external capacitor.
1. Read General Repair Information; page 4.
2.
Relieve pressure; page 4.
3. Fig. 6. Remove six screws (12) and motor
cover (18).
4.
Electric Shock Hazard; page 3.
Fig. 3. Discharge any residual capacitor voltage
with a resistive load across terminal screws (41).
5. Fig. 4. Pry off two brush caps (A). Tag locations of
red (+) and black (–) motor leads.
6. Fig. 5. Remove screws (41) and discard brushes
(B) for motor with capacitor attached.
(Continued on page 12)

Spin Test

Motor Brush Replacement

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 11.
3. If still uneven or no resistance, replace motor;
page 13.
155
ti4816a
Fig. 2
Fig. 3
A
41
ti4815a
309977 11