Dayton Electric Chain Hoist 3YB83

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 before starting the lubrication process

Was the Load Hook Bearing lubricated with SAE 30 gear or motor oil?

Upload a photo of the lubricated Load Hook Bearing

Sign off on the Load Hook Bearing lubrication

Periodic — Indicates items requiring inspection monthly to yearly. Inspections to be performed by or under the direction of a properly designated period.; The exact period of inspection will depend on frequency and type of usage. Determination of this period will be based on the user’s experience.; It is recommended that the user begin with a monthly inspection and extend the periods to quarterly, semi-annually or annually based on user’s monthly experience.

1. Inspect Hook and Suspension

Possible Deficiencies:; - Cracks, bending, stripped threads Lug Connections

2. Inspect Pins, Bearings, Bushings; Possible Deficiencies:; - Excessive wear, corrosion, cracks, distortion Shafts, Couplings

3. Inspect Nuts, Bolts, Rivets

Possible Deficiencies:; - Looseness, stripped and damaged threads, corrosion

Possible Deficiencies:; - Distortion, cracks, and excessive wear.

- Build-up of foreign substances

IMPORTANT: Before placing hoist in operation, check the limit switch ad-justment.

Limit switches are provided to protect the hoist against damage resulting from overtravel or to allow setting the hook travel within the factory-set limits of travel.; For easy identification and association with the proper direction of travel, the upper and lower limit switch adjusting nuts are color-coded gold and silver respectively.; Each limit nut has 10 slots for fine adjustment, and the increment of adjustment is such that one slot is equivalent to approximately one link of chain travel.

Movement of the limit switch nuts toward or away from each other increases or decreases the hook travel respectively.; Care should be exercised when adjusting either limit of travel.

ADJUSTING UPPER LIMIT (GOLD NUT)

1. Suspend the hoist. For single chain models raise the load block until there is a minimum clearance of 2" from the hoist housing and the top of the block.; Double chain models require a minimum clearance of 1" from the chain support to the top of the load block.

2. DISCONNECT HOIST FROM POWER SUPPLY and remove the electrical cover.

3. With a screwdriver, pry the spring guide plate out of the slots in the limit switch nuts.

4. Turn the slotted gold nut toward its limit switch until the switch "clicks" then turn two slots farther.; Release the spring guide plate and be sure it slips back into the slots in both limit switch nuts. Do not disturb the silver slotted nut if it has been set previously.

ADJUSTING LOWER LIMIT (SILVER NUT)

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