Dayton Electric Chain Hoist 3YB79

Warning: Always disconnect hoist from power supply before starting the procedure

Hoist disconnected from power supply

Reconnect the leads to the terminal block according to the wiring diagram located inside the electrical cover

Leads reconnected according to the wiring diagram

Recheck phasing and limit switch operation after converting voltage

Phasing and limit switch operation checked

Make sure all terminals are securely fastened and check for damaged insulation

Warning: Disconnect hoist from power supply before starting the procedure

Hoist disconnected from power supply

Upload a photo of the electrical cover removed

Enter the gap between the brake armature and the field

Is the gap within the acceptable range (0.015\ - 0.040\")?"

Adjust the 3 locknuts and check with a feeler gauge to ensure the gap is the same on both ends of the solenoid

Is the bottom of the armature not bearing against the splined adapter?

Is the disc thickness above the minimum allowable (.162\)?"

Inspect hooks for cracking, extreme wear or spreading

Check if throat openings are spread wider than the maximum permissible 15% increase

Check if any hook is bent or twisted more than 10 degrees from the plane of an unbent hook

Inspect the hook latches 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

Check if the hook nut is fully restrained by the retaining pin

Inspect load hooks for cracks by the magnetic particle, dye penetrant or other suitable crack testing inspection method

Sign off on the daily hooks inspection

Warning: Only trained personnel should perform this procedure

Dayton Dem-Kote No. 5X628 multi-purpose oil available

Sign off on the lubrication process

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