3.Using a “C” link, join the old load chain to the new load chain. (If the old load chain was installed correctly, the “C” link assures end link of new load chain will be correctly reeved through the hoist.) Be sure welds of “standing” links on the new load chain are facing away from the hoist load sheave. Refer to Dwg. MHP0042 on page 9.
(Dwg. MHP0042)
4.Run the new chain to its anchor point. On smaller units, use the hand chain to move the load chain. On larger units, load chain installation can be speeded up by removing gear cover, support plate and taking out gears. With the gears removed, the load chain can be pulled by hand through the hoist body and hook blocks. Reinstall gears, support plate, and gear cover.
5.Remove “C” link and old chain.
6.On 1/2, 1 and
For information on connecting unloaded end of load chain, refer to ‘Attaching End of Load Chain’ section.
7.Check for the following:
a.Load chain did not become twisted, when reeving the load chain between the idler sheave on the bottom hook assembly and the hoist load sheave. Refer to Dwg. MHP0020 on page 9.
b.Make sure load chain is reeved between load sheave and chain guides.
(Dwg. MHP0020)
Slip Clutch
The slip clutch is designed to slip, (handwheel rotates but no load chain movement), when attempting to lift a load greater than the capacity of the hoist. To adjust the slip clutch you will need a weight that is known to be 150% of hoist capacity or a scale that will read at least 150% of hoist capacity. Attach hoist to a suitable support and then attach load/scale to load hook.
Adjusting with a Weight
1.Remove handwheel cover from hoist.
2.Using hand chain ‘hoist up’ the load. If load does not rise tighten nut 1/4 turn. Attempt to raise the load. Continue tightening nut in 1/4 turn increments until load raises.
3.Then lower the load and back the nut off 1/4 turn. The slip clutch is now adjusted.
4.Reinstall handwheel cover to hoist.
Adjusting with a Scale
1.Remove handwheel cover from hoist.
2.Using hand chain, ‘hoist up’. Needle on scale should only go up to 150% of hoist capacity, then the clutch will slip.
3.If clutch slips prior to 150% capacity, ‘hoist down’ (to remove tension) and tighten nut 1/4 turn. Continue this ‘hoist up’, ‘hoist down’ procedure, adjusting the nut in 1/4 turn increments, until the scale reads 150% of rated load. The slip clutch is now adjusted.
4.Reinstall handwheel cover to hoist.
NOTICE
•Due to the nature of the design, an exact precision clutch setting may be difficult to obtain. Repeated slipping of the clutch, in an attempt to obtain an exact setting may reduce the life of clutch components.
Attaching End of Load Chain
1.Remove cotter pin from anchor hanger. Push anchor pin into one of the side plates.
2.Position end link of load chain on anchor pin.
3.Reposition anchor pin to engage both side plates.
4.Install cotter pin in anchor pin on either side of load chain and bend ends apart.
On 2, 3 and 5 ton hoists, ensure load chain is not twisted, kinked or “capsized”. Refer to Dwg. MHP0043 on page 9.
(Dwg. MHP0043)
MHD56391 - Edition 2 | 9 |
