Table of Contents
Advertisement
MAINTENANCE
Brake Inspection
Keep brake surface and lining
free of grease.
1.
Remove load and disconnect hoist from
the power source.
2.
Remove the back frame cover (index #31, page 15).
3.
Check for worn brake disc by measuring the brake air
gap with a feeler gauge (Figure 11). A brake gap larger
than the allowable wear limit — 0.039" — may cause
chatter or failure to release.
4.
If the brake is not operating properly, the entire
brake assembly must be replaced by qualified
service personnel.
Figure 11
Lubrication
The gear housing has been filled with 1/2 pound of grease
at the manufacturer and should not require attention. If
future lubrication becomes necessary, use approximately
3/4 cup of a light semi-fluid NLGI #1 grease.
Wipe the chain clean with a cloth periodically and apply a
light coat of SAE 90 gear oil.
Replacing Load Chain
Over time, the load chain will wear or elongate. This can
cause damage to the hoist, breakage, or non-engagement
of the load sheave. The following procedures describe
replacing the load chain for single and multiple fall hoists.
These procedures should be performed by experienced
personnel only.
How to Cut Chains
Use a bolt cutter with special cutter jaws for cutting
hardened chain. Cut only one side of the link at a time.
When making the second cut, place a mat over the chain
to catch the flying chain section.
Making a C-Link
Replacing load chain will require the use of a C-link
(in some cases, two C-links), which you can easily
make as follows:
1.
Cut a link from the old chain.
2.
Cut the weld from the link leaving an opening
approximately 1.25 times the diameter of the link
material. See Figure 12.
3.
Grind the cut areas smooth and remove all burrs.
Figure 12
Single Fall Chain Hoist
1.
Lower the load hook until only 1 to 2 feet of
slack chain remains in the chain container.
2.
Remove chain container.
3.
On the slack side of the old chain, remove the chain
stop and the spring (Figure 13). Keep these handy
for later re-installing.
Figure 13
4.
Using a C-link, connect the new chain to
the old chain. Be sure vertical link welds
face away from load sprocket (see Figure 14).
(Dual fall model shown)
Figure 14
9
Advertisement
Table of Contents
