Dayton Electric Chain Hoist 3YB76

1. Inspect hooks once daily for cracking, extreme wear or spreading. Replace hooks showing any of these signs.; If the throat openings are spread wider than the maximum permissible 15% increase listed here, the hooks have been overstressed and must be replaced.; Any hook that is bent or twisted more than 10 degrees from the plane of an unbent hook must also be replaced.

2. The hook latches should be inspected to ensure that they close the hook throat opening in a secure manner when a load is applied.; Inspect the hook shank and nut for any stripping of the threads or other damage. The hook nut should be fully restrained by the retaining pin.

3. In addition to above, load hooks should be inspected for cracks by the magnetic particle, dye penetrant or other suitable crack testing inspection method. This should be done at least once a year.;

1. For major repairs or when the hoist is to be sectioned in the suspension area, it will be necessary to move the hoist to a workbench or table.

2. For repairs which can be done by removing the electrical cover only, the hoist need not be moved.

Lowering the hoist to a convenient working level is desirable.

NOTE: If you do not have an experienced mechanic to do your repair work, we recommend that you send your hoist to an approved service station for repairs.; Use authorized repair parts only.

Remove load and disconnect hoist from power supply before starting to do any repairs or to take any sections apart.

The following repair instructions will help you in understanding repair procedures.

1. Remove the electrical cover. The control panel, brake assembly, and limit switch assembly are located under the cover.; The contactor and terminal block are accessible without further disassembly. It will be necessary to remove the electrical panel to replace the transformer, solenoid, limit switches, or brake parts.

DISCONNECT HOIST FROM POWER SUPPLY and remove the electrical cover

Remove the spring guide plate from the slots in the limit switch nuts

Turn the slotted nut back to about the center of the threaded screw

Remove the load block assembly from old chain

Remove the chain stripper to detach the chain from the chain anchor and pull it through the load block assembly

Pull the chain out of the chain stripper

Make a 'C' link by grinding through the end link on the load end of the old chain

Attach the new chain to the load end of the old chain using the 'C' link

Warning: Ensure the machine is turned off and unplugged before starting the procedure

Lubrication of Limit Switch Shaft with Dayton Dem-Kote No. 5X628 multi-purpose oil or general purpose spray

Sign off on the lubrication process

DISCONNECT HOIST FROM POWER SUPPLY and move hoist to a work table. Do not remove the electrical cover.

Detach the chain stripper from the bottom of the hoist.

Disassemble the transmission assembly following the instructions in the section on GEARING.

Remove the output shaft through the transmission, allowing the load sheave and chain guide to be removed from the bottom of the hoist. Be careful not to lose the spacer that is between the load sheave and the bearing on the motor end.

NOTE: Inspect chain guides and load sheave for wear, replace as needed.

Lay the new chain over the load sheave. Allow about 15 inches of chain below the hoist on the slack end. Be sure the welds of the upstanding links are out away from the load sheave and the proper orientation is observed for attachment of the slack end. Also be sure the load hook assembly (if already attached to the chain) is toward the center of the hoist or to your right looking from the transmission end.

Reinstall the chain guide in the housing. Grease the splined bore of the load sheave, then position the load sheave and spacer in the housing.

Reassemble the output shaft and transmission.

Pass the new chain through the opening in the chain stripper.