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This illustration shows the base limit switches and the serviceable components of the base actuator. Use the table below to isolate the malfunction.

Equipment Alert

Anytime the limit switch wires or the actuator wires are disconnected, the PC Board must be calibrated.

Anytime an Overtravel Limit Switch is detected open, both Up and Down functions are deactivated.

630 Chair Base Actuator / Limit Switches

Problem	Required Action
Motor runs, but makes grinding noise	Clean / lube actuator threads. Lube threads w/lithium grease. Replace actuator if necessary
Motor runs, but chair does not move	Inspect / replace motor coupler
Motor does not run	Test Limit Switch(es)