Motor Diagnostics - Graco Pro 230ES Repair And Parts Manual

Motor Diagnostics

Motor Diagnostics
Spin Test
*NOTE: Motors used in the Pro 270ES, model sprayers
are brushless. The following brush information and
instructions apply to model Pro 230ES sprayers only.
Check for electrical continuity in motor armature, wind-
ings and brush* as follows:
If Motor Diagnostics reveal a damaged motor or of motor
brushes* are shorter than 1/2 in (12.7 mm) or if the
motor shaft cannot turn, replace the motor, page 33.
Setup
1. Relieve pressure, page 9.
2. Unplug electric cord.
3. Remove drive housing, Drive Housing Replace-
ment, page 20.
4. Remove pressure control cover (50). Disconnect
connector F.
5. Remove four screws (12) and motor shroud (23)
and inspection covers.
Armature Short Circuit Test
Quickly turn motor fan by hand. If not shorted, motor will
coast two or three revolutions before complete stop. If
motor does not spin freely, armature is shorted. Replace
motor, page 33.
22
Armature Brushes and Motor
Wiring Open Circuit Test
(Continuity)
1. Connect red and black motor leads together with
test lead.
F
2. Turn motor fan by hand, about two revolutions per
second.
3. If there is uneven resistance or no resistance, check
for broken brush springs*, brush leads*; loose brush
terminal screws*, worn brushes*, or motor lead ter-
minals. Repair as needed, page 24.
4. If still uneven, or no resistance, replace motor using
Motor Kit, page 33.
50
3A2817A