Milwaukee Tool 9672-20 - Manual (Page 6)

page 6
Check to make sure that the latch is not damaged or bent and that it
operates properly with sufficient spring pressure. Spring pressure keeps
the latch tight against the tip of the hook and allows the latch to spring
back to the tip when released. If the latch does not operate properly, it
should be replaced.
Load Chain
Cleaning and Inspection
Clean the load chain with a non-acid or non-caustic type solvent then
slack the chain and make a link-by-link inspection for nicks, gouges,
twisted links, excessive wear or stretching. Worn chain should be gaged
throughout it's entire length and replaced if beyond serviceable limits.
To determine if the load chain should remain in service, check gage
lengths as indicated in Fig. 5. A chain that is nicked, gouged, twisted or
worn beyond length indicated, should be replaced before returning hoist
to service. Chain should be clean, free of twists and pulled taut before
measuring. In cases where the wear is localized and not beyond ser-
viceable limits, it is sometimes possible to reverse the load chain, end for
end, and allow a new section to take the wear. Proper installation of the
load chain is covered in the section on “Reeving Load Chain”.
NOTE: Worn chain can be an indication of worn hoist components. For
this reason, the hoist's chain guide roller and liftwheel should be exam-
ined for wear and replaced as necessary when replacing worn chain.
Load chains are specially heat treated and hardened and should never
be repaired.
Do not use replaced chain for other purposes such as lifting or pull-
ing. Load chain may break suddenly without visual deformation. For this
reason, cut replaced chain into short lengths to prevent use after dis-
posal.
Before returning chain to service or after replacing a load chain, lubri-
cate liberally with Bar and Chain Oil such as Lubriplate
® 10-R (Fiske
Bros. Refining Co.) or equivalent. Remove excess lubricant from chain
by wiping with a clean, dry cloth.
Hand Chain
Cleaning and Inspection
Hand chain should be cleaned, inspected and gaged in the same manner
as a load chain.
As received from the factory, the hand chain contains an unwelded link.
This link can be placed in a vise and twisted open to facilitate changing
chain length. The opening and closing of the connecting link more than
twice is not recommended. Connecting links must not be made by cutting
the weld side of a standard hand chain link.
Hand chain should be assembled to handwheel free from twists with weld
on vertical link facing inwards towards handwheel and weld on horizontal
link facing towards the handwheel side plate.
Care must be taken to assure that there is no twist in the hand chain loop.
Lubrication
Lubricate load chain with a light coat of Bar and Chain Oil such as
Lubriplate
® 10-R (Fiske Bros. Refining Co.) or equivalent. Be sure the
lubricant reaches the bearing surfaces between the links. Remove ex-
cess oil from the chain by wiping with a clean, dry cloth.
Hoist Rated Load
Tons (Kg)
1/2 (500)
1 (1000)
2 (2000)
3 (3000)
5 (5000)
Replace Hook when
Opening is greater than:
Inches mm
1.00 25.3
1.20 30.5
1.45 36.8
1.65 41.8
2.09 53.2
Measure opening
Hook throat opening
Hook Inspection and Maintenance
Hooks damaged from chemicals, deformations or cracks, or that have
more than a 10 degree twist from the plane of the unbent hook, exces-
sive opening or seat wear must be replaced.
Hooks that are opened and allow the latch to disengage the tip must be
replaced.
Any hook that is twisted or has excessive throat opening indicates
abuse or overloading of the unit. As a result, other components of the
hoist could be damaged.
The chart in Fig. 4 should be used to determine when the hook must be
replaced. To measure the throat opening, depress the latch against the
hook body as shown in Fig. 4.
Fig. 4
WARNING!
To reduce the risk of injury, avoid contact with
lubricants. Handle and dispose of lubricants only as
directed in applicable Material Safety Data Sheets
and in accordance with applicable local, state and
federal regulations.
The hoist normally requires no lubrication, except for periodically lubri-
cating the load chain or when the unit is disassembled for periodic
inspections, cleaning or repairs.
WARNING!
To reduce the risk of injury, never use used
motor oil as a chain lubricant. Used motor oil
contains unknown carcinogenic materials. Use
only Bar and Chain Oil such as Lubriplate
® 10-R or
equivalent as a lubricant for the load chain.
Hoist Rated
Load
Tons (Kg)
1/2 (500)
1 (1000)
2-5 (2000-5000)
Hand Chain
Chain Stock
Diameter
In. (mm)
0.197 (5)
0.236 (6)
0.394 (10)
0.193 (4.9)
No. of Links
to Gage
11
11
11
15
Max. Length
allowable for
Used Chain
In. (mm)
7.031 (178.6)
8.531 (216.7)
14.122 (358.7)
14.811 (376.2)
Number of
links in gage
Gage
length
Fig. 5