Dayton Electric Chain Hoist 3YB90

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: 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

Check for damaged insulation and make sure all terminals are securely fastened

DISCONNECT HOIST FROM POWER SUPPLY and remove the electrical cover

Spring guide plate removed from the slots in the limit switch nuts

Slotted nut turned back to about the center of the threaded screw

Load block assembly removed from old chain

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

Old chain removed from the chain stripper

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

New chain attached to the load end of the old chain using the 'C' link

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.

Inspect Hook and Suspension for cracks, bending, stripped threads Lug Connections

Inspect Pins, Bearings, Bushings for excessive wear, corrosion, cracks, distortion Shafts, Couplings

Inspect Nuts, Bolts, Rivets for looseness, stripped and damaged threads, corrosion

Inspect Sheaves for distortion, cracks, and excessive wear. Build-up of foreign substances

Inspect Housings, Load Block for cracks, distortion. Excessive wear, internal build-up of foreign substances.

Inspect Wiring and Terminals for fraying, defective insulation

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.