Yale Series Y80 manual Section Vll Adjustments

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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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Contents Rated Loads 1/2 Thru 5 Tons IncludingIndex ForewordSection I General Description Section II InstallationPRE-OPERATION Checks Limit Stop Mechanism Being Tripped By Lower Block Operating Precautions Section III OperationPush Button Operation Lubricate Upper Sheave and Lower Block Assembly Section IV LubricationLubricate Limit Stop Lever Section Inspection and Preventive Maintenance Inspect Upper Block and Hoist Suspension Inspect Lower BlockInspection Schedule and Maintenance Report Inspect Mechanical Load BRAKE, Gearing Time Interval Inspection or MaintenanceRemoving Intermediate Gear Pinion Assembly Inspect Rope Drum and Shaft Rope Reeving Rope INSPECTION, Maintenance and ReplacementTurn OFF Power to Hoist 12204A Testing Hoist and Overload Clutch Optional Do not lift more than rated load except for test purposes Section Vl Trouble Shooting Probable Cause Remedy Section Vl Trouble Shooting Probable Cause Remedy Section Vll Adjustments Section Viii Wiring Diagrams Section IX Parts ListIndex of Exploded View Parts Illustrations Part Qty Number Description Part Qty Number Description Req’d †Recommended spares 11456LC Gearing and Load Brake Parts. Cont’d 12756H Kit Description Part Number Reference Numbers Included Hoist Motor Brake Early Version Hoist Motor Brake. Cont’d Qty Req’d 11460 12748A Not available separately. Order Push Button Station 12721A Push Button Station and Conductor Cable Assembly. Cont’d 12721 10. Push Button Station and Conductor Cable Assembly. Cont’d 11. Lower Block Assembly Two Parts Rope, Single Reeved 12. Lower Block Assembly-Two Parts Double Reeved Quantity Required 14. Screw-Type Limit Switch Parts Warranty