Disassembly
WARNING
•Disconnect the air supply hose before performing any maintenance or repairs on this hoist.
General Instructions
All maintenance work done on the Liftchain hoist should be performed on a bench in a clean dust free work area. In the process of disassembling the hoist, observe the following:
1. Never disassemble the hoist any further than is necessary to accomplish the needed repair. A good part can be damaged during the course of disassembly.
2. Never use excessive force when removing parts. Tapping gently around the perimeter of a cover or housing with a soft hammer, for example, is sufficient to break the seal.
3. Do not heat a part with a flame to free it for removal, unless the part being heated is already worn or damaged beyond repair and no additional damage will occur to other parts. In general, the hoist is designed to permit easy disassembly and assembly. The use of heat or excessive force should not be required.
4. Keep the work area clean to prevent dirt and other foreign matter from getting into bearings and other moving parts. 5. All seals and 'O' rings should be discarded once they have been removed. New seals and 'O' rings should be used when assembling the hoist.
6. When grasping a part in a vise, always use leather- or
7. Do not remove any part which is press fit in or on a subassembly unless the removal of the part is necessary for repairs or replacement.
8. To avoid damaging bearings during hoist assembly or disassembly always tap or press on the bearing inner race for shaft fit bearings or the outer race for bore fit bearings.
9. For assembly work above body height, suitable working platforms or ladders should be made available.
10. Do not attempt to wash sealed bearings.
If hoists are to be completely disassembled it is recommended that the motor assembly and brake/gear housing assembly be removed as complete assemblies from the chain guide housing. This can be accomplished by removing the capscrews, nuts and washers that clamp the housings together. Carefully separate assemblies and clean mating surfaces. Assemblies are Loctited together.
The muffler is located in the top of the gear housing. To clean muffler remove retainer ring in gear housing and with the aid of small pick remove the first muffler plate. Remove 'O' ring, second muffler plate and last 'O' ring.
Load Chain Replacement
WARNING
•NEVER splice a load chain except when installing a new load chain by the following method. Always discard the link used to connect the old chain with the new.
Excessive chain wear cannot be detected by casual observation. The chain is case hardened and once the case hardening is worn through, wear will progress rapidly and the strength of the chain will be considerably reduced.
Further, the chain will no longer fit the chain sprocket properly, greatly increasing the chance of malfunction and chain breakage.
One chain sprocket will outlast several chains if the chain is replaced as recommended. The use of a worn chain will cause the chain sprocket to wear rapidly.
If the chain is visibly damaged, examine the chain sprocket and chain guide. Install a new chain sprocket if the old one is visibly worn. Install a new guide if the old one is broken or distorted.
NOTICE
•For ease of installation, do not remove the old chain from the hoist. Use the old chain to feed the new chain through the hoist.
1.The hoist must be hung and connected to the air supply. Reduce air pressure to 60 psi (4 bar).
2.Remove chain bucket, if used.
3.Remove free end of chain from hoist body, if attached. Remove chain buffer and limit stop.
4.Remove the load hook.
5.Run hoist slowly in the lifting direction until the chain free end is approximately 2 ft (60 cm) from the hoist.
6.Using an abrasive wheel, cut a section from the last link. Use a 'C' link which is the same size as the chain.
CAUTION
•Do not distort the link in any manner. It must be able to pass over the pocket and idler wheels without binding.
7.Connect the new chain to the old chain by hooking the end of the new chain onto the 'C' link. Make certain the welds and links on the new chain match the positioning of the welds and links on the chain being replaced.
CAUTION
•Ensure that chain does NOT become twisted during reeving. All chain welds must align while chain is hanging free.
8.Slowly run the hoist in the raise direction, running off the old chain and reeving the new chain over the chain wheel.
The first link of new chain over the chain wheel must be a standing link.
9.Reinstall the load hook, chain buffer and limit stop
WARNING
•A twisted chain can jam as it passes over the pocket wheel, possibly resulting in damage to the hoist or even
breaking the chain and causing injury.
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