Section Vl Trouble Shooting Probable Cause Remedy

SECTION Vl - TROUBLE SHOOTING (Continued)

	Trouble	Probable Cause	Remedy
6-5. Hoist Will Not Lift Rated		a. Low voltage	a. See that power supply current is same voltage
	Load.		Iisted on motor data plate. Check hoist motor
			connections. Check size of power supply lines.
		b. Overload Clutch not properly	b. See Section VII, paragraph 7-5.
		adjusted.

6-6.	Hoist Motor Overheats.	a. Excessive load.	a. Reduce loading to rated load of hoist, shown on
			nameplate.
		b. Excessive duty-cycle.	b. Reduce frequency of lifts or amount of jogging.
		c. Wrong voltage or frequency.	c. Check current rating on motor data plate against
			power supply. Check hoist motor connections.
		d. Defective motor or worn bear-	d. Disassemble hoist and inspect for defective, worn
		ings in hoist frame.	or damaged parts.
		e. Overload Clutch slipping without	e. See Section VII, paragraph 7-5.
		lifting load.

6-7.	Load Drifts Excessively	a. Excessive load.	a. Reduce loading to rated load, as shown on
	When Hoist Is Stopped.		nameplate.
		b. Motor brake not holding.	b. With No Load, check hoist for drift. If drifting is
			excessive, inspect motor brake (Section V,
			paragraph 5-5) and adjust as outlined in Section
			VII, paragraph 7-2.
		c. Load brake not holding.	c. (1) After determining that the motor brake is working
			properly, attach rated load to hook and operate
			hoist. If the load accelerates during lowering, the
			load brake is not functioning properly. See Section
			V, paragraph 5-6 for replacing worn or damaged
			parts.
			(2) If load brake checks O.K., magnetic motor brake
			needs adjustment (see b. above).

6-8.	Hoist Operates	a. Collectors make poor contact.	a. Check collectors for free movement of spring arm,
	Intermittently		weak spring or electrical connections.
		b. Loose connections.	b. Check all wiring for loose connections.

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