Motor Diagnostics (X5 and X7)
Motor Diagnostics (X5 and X7)
If Motor Diagnostics reveal a damaged motor or if motor brushes are shorter than 1/4 in. (6.4 mm) replace the motor using Motor Kit, page 26.
Setup
1.Unplug power cord and Relieve Pressure, page 9.
2.Remove enclosure and disconnect two black motor leads to control board (see Wiring Diagram, page 36).
3.Remove motor fan cover by gently prying up on retention tabs on sides of motor. Motor shaft should spin easily when turning fan. If motor shaft does not turn easily, there is a problem with pump, gears, or motor (see Troubleshooting, page 11).
4.Inspect motor windings for evidence of overheating. If windings appear burnt and motor smells, replace motor.
5.Use Ohmmeter to measure resistance across two black motor leads. Resistance of motor should fall within range of 1.5 to 4.5 ohms. If motor falls outside resistance range or is open circuit, replace motor.
6.Use Ohmmeter to measure resistance of motor leads to motor laminations. If resistance is not open circuit, replace motor.
7.Inspect length of both brushes by looking at brush torsion spring. If spring is not bottomed out in slot for brush spring, brush length is acceptable. If brushes are worn out, replace motor.
Motor Diagnostics (ProX7 and ProX9)
Check for electrical continuity in motor armature, windings and brush as follows:
If Motor Diagnostics reveal a damaged motor or if motor brushes are shorter than 1/4 in. (6.4 mm) or if the motor shaft cannot turn, replace the motor using Motor Kit, page 26.
Setup
1.Relieve Pressure, page 9.
2.Unplug electric cord.
3.Remove enclosure and disconnect motor leads from control card.
4.Remove fan brace.
5.Remove four screws and front cover.
6.Remove yoke and guide rods.
7.Remove gear.
Armature Short Circuit Spin Test
Quickly turn motor fan by hand. There should not be electrical shorts and fan should coast two or three revolutions before stopping. If fan does not spin freely, armature is shorted. Replace motor using Motor Kit, page 26.
Armature, Brushes and Motor Wiring Open Circuit Test (Continuity)
1.Connect red and black motor leads together with test lead.
2.Turn motor fan by hand, about two revolutions per second.
3.If there is an uneven resistance or no resistance, replace motor using Motor Kit, page 26.
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