Dayton Electric Chain Hoist 3YB74

Warning: This procedure should only be performed in an emergency when the power fails with a load suspended.

Hoist disconnected from power supply and electrical cover removed

Disc brake opened manually using two screwdriver blades

Warning: Do not allow screwdriver blades to touch rotating friction disc.

Pressure applied to the underside of the armature plate to close the solenoid and release the brake

Caution: Do not allow the load to descend rapidly. This causes the motor to race and serious damage may result.

Several quick releases used instead of holding brake open continuously

Normal lowering speed not exceeded

Sign off on the load chain lowering procedure

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.

Following the instructions in the section on GEARING, disassemble the transmission assembly.

Remove the output shaft through the transmission, allowing the load sheave and chain guide to be removed from the bottom of the hoist.

Be care 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\ 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.

Warning: Ensure the machine is turned off before starting the lubrication process

Lubrication done with SAE 30 gear or motor oil

Upload a photo of the lubricated bearing

Sign off on the lubrication process

Warning: Ensure the machine is turned off before starting the lubrication process

Lubrication done with Dayton Dem-Kote No. 5X628 multi-purpose oil or general purpose spray

Enter the amount of lubricant used

Sign off on the lubrication process

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.