HOOK DIMENSIONS (OPENING)
Inspect the hooks for deformations, chemical damage or
cracks. Hooks damaged from chemicals, deformation or
cracks, or hooks having throat openings greater than the
“reject opening” shown in the table must be replaced. If the
hook is twisted more than 10 degrees from the plane of the
unbent hook, it must be replaced.
DISASSEMBLY
Disassembly of the hoist is straightforward. Note the location
and orientation of the various parts.
LUBRICATION
1.
Good lubrication is vital to long chain life. The load chain
should be kept well oiled with SAE 30 weight oil. Be sure
that the oil is worked into the area between the links.
2.
If the hoist is disassembled for inspection or repair,
relubricate the moving parts according to Table 3.
ASSEMBLY
Assembly is the reverse of disassembly. Be sure to note the
following points.
1.
The twin gears each have an “O” stamped on them which
is used as a timing mark. The twin gears must be installed
so that the timing marks both point to exactly the 9 o’clock
position at the same time (See Figure 2).
2.
Assemble the brake parts as shown in the exploded view
(Figure 3). Screw hand chain wheel down tight. Screw the
nut down finger tight on the input shaft, then back it off
approximately one-quarter turn and install the cotter pin.
3.
Install chain by running a piece of wire or string between
the chain guide roller and load sprocket and then over and
around the load sprocket. Tie the chain to the wire or
string and pull it into the hoist so that the first link is
standing on edge in one of the slots of the load sprocket,
with the weld away from the sprocket. Operate hoist in the
UP direction, pulling about a foot of chain around the
sprocket and out the hoist. Remove the cotter pin from the
slack end pin and slide the pin to one side. Pull the end of
the chain under the chain guide roller and hook the last
link over the slack end pin, being sure the chain has no
twist. Slide the slack end pin back into position and install
the cotter pin through it.
Capacity Standard Reject Opening
(ton)
Dimension F (inch)
F (inch)
1/2
1.181 1.300 & Over
1
1.417 1.575 & Over
1½
1.535 1.693 & Over
2
1.653 1.811 & Over
3
1.890 2.086 & Over
5
2.205 2.440 & Over
5
Country Club Road
P.O. Box 779
Wadesboro, NC 28170 USA
TEL: (800) 477-5003
FAX: (800) 374-6853
If chain is worn or otherwise damaged, replace entire
chain with new chain supplied by the hoist
manufacturer. Do not substitute. Do not attempt to
reweld damage.
Interval
Inspection
Daily
a. Check hooks and hook latches for deformation or cracks. Twisted hooks or hooks with throat openings
more than the reject openings listed in above table should be replaced.
b. Visually check chain for wear and twist.
c. Check brake for drift.
Quarterly
a. Check for loose screws, nuts, etc.
b. Check load sprocket and hand chain wheel for wear.
Annually
a. Inspect for worn gears, bearings, pawl, pawl spring, ratchet, and shafts.
(See
b. Check for worn brake discs.
Disassembly)
c. Inspect hooks for cracks using magnetic particle or similar test.
d. Clean chain in kerosene or other non-corrosive solvent and inspect for wear, nicks, or distortion of any kind.
The brake surfaces must be kept free of any trace of
oil or grease. Apply lubricant sparingly to the parts
near the brake to avoid oil contamination of the brake.
Part
Lubricant
Gears, bearings, pawl pivot
Any good quality
pin, guide roller pin, hook
NLGI #2 grease
shanks, and chain wheel threads
Chain
SAE 30 weight oil
Brake parts, ratchet teeth
Do Not Lubricate
Table 3 - Recommended Lubricants
Figure 2 - Twin Gear Timing Marks
Table 2 - Inspection Schedule
F
Timing Marks
Use calipers to check the chain for wear as shown in Figure 1.
Replace any chain showing damage or wear beyond the wear
limit shown. (Make certain the caliper anvils are small enough
to seat in the links.)
Be sure the slack end of chain passes between the
chain guide roller and the load sprocket and under the
chain guide roller.
Summary of Contents for LHH-1 1/2B
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