Yale Series Y80 manual Testing Hoist and Overload Clutch Optional

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Figure 5-16. Upper Sheave Installed (Typical).

(3)Place sheave with rope into upper sheave pocket and slide pin partially thru sheave. Install remaining washer and push pin thru side plates. Install snap ring on each end of pin to secure pin in place.

12206A

Figure 5-17. Hoist Reeving — Two Part Double.

(4)Insert lower sheave pin into bottom block removing pipe as sheave pin is inserted. Be certain washers are replaced as shown on parts illustration. With sheave pin installed, replace key plates and bolts to secure sheave pin.

(5)Replace sheave guard.

(6)Lubricate rope per paragraph 4-3. h. Checking for and removal of rope twisting.

Although rereeving of hoist may have been done carefully, sometimes after new rope has been installed twisting may occur. With new rope installed, the hoist block should be raised and lowered several times with gradually increasing loads, through full lift. If the block still rotates excessively at no load, the rope may have twists which should be removed.

(1)To remove rope twist in single reeved hoists.

(a)Observe direction block tends to rotate.

(b)Lower the block to a low position and turn off power.

(c)Rotate rope near the anchor end several turns in a direction tending to correct block rotation. This rotates rope end fitting in the anchor.

(d)Turn on power; raise and lower the block several times to feed the correcting twist in the rope through the reeving.

(e)If block still tends to twist, repeat the above procedure until block rotation is corrected.

(2)To remove rope twist in double reeved hoists.

(a)Observe direction block tends to rotate.

(b)Lower the bottom block unspooling rope from rope drum until only one quarter (1/4) turn remains to rope end anchors in drum.

(c)Rotate rope near ends entering drum in a direction tending to correct block rotation. This rotates rope end fittings in the drum.

(d)Turn on power; raise and lower the block several times to feed the correcting twist in the rope through the reeving.

(e)If block still tends to twist, repeat the above procedure until block rotation is corrected.

5-10. TESTING HOIST AND OVERLOAD CLUTCH (Optional).

a.General. Before placing hoist in service or after disas- sembly and reassembly, hoist should be tested. To test sus- pend hoist from an overhead supporting member of sufficient strength to support the weight of the hoist and the rated load. Hoists having overload clutches, require an overhead sup- porting structure capable of supporting with appropriate safety factor, a load equal to 200 percent rated load and the weight of the hoist. Connect hoist to power supply as shown on hoist nameplate and perform the checks listed in b and c below.

b.Check hoist as outlined in PRE-OPERATION CHECKS, Section II, paragraph 2-4.

c.Check hoist with capacity load.

(1)Attach rated load to lower hook.

(2)Depress á push button and raise load. When push button is released, hoist should immediately stop and hold load at that level.

(3)Depress â push button, lower load a short distance and release button. Hoist should stop immediately and hold load at that level.

NOTE: If load drifts downward slowly in step 2 or

3 above, motor brake requires adjustment — see MOTOR BRAKE ADJUSTMENT — Section Vll — paragraph 7-2.

d.Overload Clutch. The overload clutch (optional) must be tested for proper operation before placing hoist in service or after disassembly and reassembly of hoist. For test procedure follow instructions listed below.

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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 Push Button Operation Operating PrecautionsSection III Operation Lubricate Limit Stop Lever Lubricate Upper Sheave and Lower Block AssemblySection IV Lubrication 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 Index of Exploded View Parts Illustrations Section Viii Wiring DiagramsSection IX Parts List 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