Yale 11353395D manual Section VII Adjustments, Section VI Trouble Shooting Probable Cause Remedy

SECTION VI – TROUBLE SHOOTING

TROUBLE	PROBABLE CAUSE	REMEDY
6-4 Hook Will Lower,	a.Excessive load.	a.Reduce loading to rated load of hoist as shown on
But Not Raise.		nameplate.
	b.Hoist electrical circuit open.	b.Check for loose connections. See that necessary
		jumper wires are properly installed on contactor.
	c. Contactor assembly not	c. See that necessary jumper wires are properly
	functioning.	installed. Verify that the contactor armatures are
		free to move. If binding occurs, replace contactor.
		Check for burned out contactor coils.
	d.Up, down button inoperative.	d.Check push button contacts and wires.
6-5 Hoist Will Not	a.Low voltage.	a.See that the power supply current is the same
Lift Rated Load.		voltage listed on motor data plate. Check hoist
		motor connections. Check size of power supply
		lines.
6-6 Hoist Motor	a.Excessive load.	a.Reduce loading to rated load as shown on
Overheats.		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 and inspect for
		defective, worn or damaged parts.
	d.Defective motor or worn	d.Disassemble hoist and inspect for defective, worn
	bearings in hoist frame.	or damaged parts.
	e.Brake not adjusted correctly.	e.Adjust brake per Section VII, Paragraph 7-1.
6-7 Load Drifts	a.Excessive Load.	a.Reduce loading to rated load as shown on
Excessively		nameplate.
When Hoist is
Stopped.	b.Motor brake not holding.	b. With No Load, check hoist for drift. If drifting is
		excessive, inspect motor brake (Section V,
		Paragraph 5-10) and adjust as outlined in Section
		VII, Paragraph 7-1.
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.

SECTION VII – ADJUSTMENTS

7-1.MOTOR BRAKE ADJUSTMENT. These brakes are designed so that adjustment is seldom required. If, after a period of service, the load hook “drifts” downward more than usual for your hoist before coming to a stop, the motor brake may require adjustment to compensate for brake disc wear.

Refer to Figure 5-9 and proceed as outlined in Section V, Paragraph 5-10.

7-2.BLOCK OPERATED LIMIT SWITCH. The block operated limit stop, furnished as standard equipment, is non-adjustable and designed to stop the lower block at the safest high point of travel to eliminate any possibility of double-blocking. When the safest high point is reached, the limit switch automatically stops hook travel.

WARNING

Check to be certain main power switch is locked in open position (OFF) before removing brake cover.

7-3.GEARED ROTARY LIMIT SWITCH ADJUSTMENT. The geared rotary type limit switch is standard equipment and is located on the drum end opposite the gearcase end.

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