Yale Series Y80 manual Section Vll Adjustments

SECTION Vll — ADJUSTMENTS

7-1. MECHANICAL LOAD BRAKE. The mechanical load brake on Series 800 YALE hoists is a pawl and ratchet “Weston” type automatic brake. The brake is not adjustable and requires only periodic inspection and occasional replacement of the friction washers.

7-2. MOTOR BRAKE. Instructions for adjusting the brake are inside the brake cover and are repeated below. Check brake adjustment after the first 30 days of service and regularly thereafter during the six-month inspection procedure. Two versions of the motor brake occur in this manual.

12759C

Figure 7-1A. Motor Brake - Later Version.

c.On the early version of the brake (Figure 7-1), if the tang is below the midway position of the two adjustment points shown on the brake, the brake should be adjusted to bring the tang back up alongside the NORMAL position on the brake.

d.Remove the hex key (1/8" size) from the holster on the cover mounting stud and carefully turn the ADJUSTING SCREW (located above the solenoid coil) clockwise. The indicating tang will move a large distance for a small turn of the adjusting screw, therefore turn the screw no more than one quarter turn before checking adjustment.

e.After adjustment operate the brake by hand to assure brake disc running clearance. The outboard brake pad should separate from the brake disc by approximately .010".

f.Replace hex key in holster.

g Replace brake cover.

7-3. BLOCK OPERATED LIMIT SWITCH. The block operated upper limit stop, furnished as standard equipment, is nonadjustable and designed to stop lower block at its high point of travel to guard against over-travel with possible damage to hoist. When high point is reached, limit stop switch automatically stops hook travel. If hook drifts upward slightly after stop switch is actuated, a reversing switch will close and automatically reverse direction of hook travel.

7-4. SCREW-TYPE LIMIT SWITCH. This limit switch has a rotary screw driven by a gear reduction which is coupled to the end of the drum shaft. Adjustment discs operate the contacts of separate switches; one for the hoisting circuit and one for the lowering circuit. The switch assembly must be wired in accordance with the appropriate wiring diagram, which is packaged with hoist. Adjustment of this screw-type limit switch is accomplished as follows: (Refer to Figure 7-2).

12759

Figure 7-1. Motor Brake - Early Version.

a.Examine position of indicating tang located below the solenoid coil (Figure 7-1 or 7-1A).

b.On the later version of the brake (Figure 7-1A), if the tang is below the line by more than 1/8", the brake should be adjusted to bring the top of the tang back up alongside the line on the adjust label.

WARNING

Before attempting actual adjustments, be certain main power switch is OFF and locked in the open position.

SWITCH		ADJUSTMENT	SWITCH
		DISCS
	LOCKING
12758B	PLATE

Figure 7-2. Screw-Type Limit Switch Adjustment.

(Wires not Shown for Clarity.)

a.Remove four screws and lift off switch cover.

b.Loosen locking plate screws. Slide locking plate away from adjustment discs.

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