Dayton Electric Chain Hoist 3YB80

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

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\)?"

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: 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

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

Disc brake opened manually using two screwdriver blades

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

Proper lubrication is necessary for a long and relatively trouble-tree hoist operation.; Refer to the following and the RECOMMENDED LUBRICATION SCHEDULE for lubrication points, type of lubricant, and frequency of lubrication.

LOAD CHAIN.; Clean the load chain with acid-free solvent and coat with SAE 90 gear oil. Wipe excess oil to prevent dripping. Never apply grease to the chain.

GEARING.; The gear case of this hoist is filled at assembly with approximately 1½ pints of SAE 90 EP gear oil.; Check oil level by removing the oil level check plug from the side of the hoist. With the hoist hanging level, gear oil should be even with the hole.

BEARINGS. All bearings except hook and idler sheave bearings are lubricated at the factory and should not require additional lubrication. Noisy or worn bearings should be replaced.

LIMIT SWITCH SHAFT.; Remove any dirt accumulation and spray with a general purpose lubricant.

HOOK BEARING.; Apply a few drops of SAE 30 gear or motor oil around the edge of the bearing.

IDLER SHEAVE BEARING (BUSHING).; Disassemble load block and apply a light coat of NLGI #2 grease, or equivalent, inside of bearing.;