Spin Test - Graco 390 Repair Manual

Spin Test

See Wiring Diagram, page 27.
WARNING
Read Electric Shock Warning, page 3 and Pressure
Relief Procedure, page 7.
To check armature, motor winding and brush electrical
continuity:
1. Relieve pressure, page 7. Disconnect power cord
from outlet.
2. Remove two screws (30) and shroud (29).
3. Remove drive housing (5), page 15.
4. Disconnect motor connector (F).
Armature Short Circuit Test
Quickly turn motor fan by hand. If motor coasts two or
three revolutions before complete stop, there are no
electrical shorts. If motor does not spin freely, armature
is shorted. Replace motor, page 26.
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
1. Connect red and black motor leads with test lead.
Turn motor fan by hand at about two revolutions per
second.
16
2. If uneven or no resistance, check for missing brush
caps, broken brush springs, brush leads, and worn
brushes. Repair as needed, page 18.
3. If still uneven or no resistance, replace motor, page
26.
30
29
F
4. Reattach motor connector (F).
5. Replace drive housing, page 15.
6. Replace shroud (29) and two screws (30).
Spin Test
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