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Inspection of hoists is divided into two general classifications
designated as “frequent” and “periodic”.
Frequent Inspections
These inspections are by the operator or other designated
personnel. Frequent inspections are to be performed daily
or prior to each use and they are to include the following:
A. Check for free movement of the lever, trigger and cam.
B. Operate hoist with no load and check for visual signs or
abnormal noises that could indicate a potential problem.
C. Check brake for evidence of slippage.
D. Check chain for lubrication, wear damaged links or
foreign material (see page 6).
E. Check hooks for damage, cracks, twist, latch
engagement and latch operation (see below).
F. Check lever for bends, cracks and damage.
G. Check support or anchor for damage.
Any deficiencies noted during the frequent inspections must
be corrected before using the hoist.
Periodic Inspections
These are visual inspections by an appointed person who
records conditions to provide a basis for a continuing
evaluation of the hoist. Periodic inspections are to be
performed semi-annually and they should include the
following:
A. All items listed under frequent inspections.
B. Evidence of loose screws.
C. Evidence of worn, corroded, cracked or distorted upper
and lower hook blocks, frame, end ring, hook block
screws, covers, lever, suspension bolt, gears, bearings,
pawls, pawl springs, cam, cam pins, lever cover, free-
chaining spring, ratchet hub, stripper, Load Limiter (if
equipped with same), ratchet and hoist hanger.
D. Evidence of worn, glazed or oil contaminated friction
discs. Friction discs should be replaced if their thickness
is less than .075 inch (2 mm).
E. Warning label for legibility.
NOTE: To perform some of the periodic inspections, it is
necessary to partially disassemble the hoist. Refer
to Disassembly-Assembly starting on page 7. Also,
the external conditions may show the need for more
detailed inspection which, in turn, may require the
use of non-destructive type testing.
Any deficiencies noted during the periodic inspection must
be corrected before using the hoist.
Hook Inspection
Hooks damaged from chemicals, deformations, or cracks, or
that have more than a 10° twist from the plane of the unbent
hook or excessive opening or seat wear must be replaced.
Any hook that is twisted or has excessive throat opening
indicates abuse or overloading of the unit. Other load-
sustaining components of the hoist should be inspected for
damage.
On latch type hooks, check to make sure that the latch is not
damaged or bent and that it operates properly with sufficient
spring pressure to keep the latch tightly against the tip of the
hook and allow the latch to spring back to the tip when
released. If the latch does not operate properly, it must be
replaced. See previous illustration to determine when the
hook must be replaced.
On Latchlok type hooks, measure seat wear and throat
opening as shown above and replace hook if measurements
indicate the need to do same.
LOAD CHAIN
Chain should feed smoothly into and away from the hoist. If
chain binds, jumps or is noisy, first clean and lubricate it (see
below). If trouble persists, inspect chain and mating parts
for wear, distortion or other damage.
Chain Inspection
First clean chain with a non-caustic/non-acid type solvent
and make a link by link inspection for nicks, gouges, twisted
links, weld spatter, corrosion pits, striations (minute parallel
lines), cracks in weld areas, wear and stretching. Chain with
any one of these defects must be replaced.
Slack the portion of the chain that normally passes over the
liftwheel. Examine the interlink area for the point of
maximum wear (polishing). Measure and record the stock
diameter at this point of the link. Then measure stock
diameter in the same area on a link that does not pass over
the liftwheel (use the link adjacent to the end ring for this
purpose). Compare these two measurements. If the stock
diameter of the worn link is 0.010 inches (0.254mm), or
more, less than the stock diameter of the unworn link, the
chain must be replaced.
10°
MAX.
Twisted
Do Not Use
Normal Ok
To use
Replace Hook
When
Opening Is
Greater Than
the following:
Weld
Wear In These
Areas
Replace Hook If
Opening Is
Greater Than
1-1/8” (28.5 mm)
on 3/4 and 1-1/2
ton units or 1-
15/16”(49.2mm)
on 3 ton unit.
Replace Hook If Seat Is Less
Than 21/32” (16.7 mm) on 3/4
and 1-1/2 ton units or 1-1/8”
(28.5mm) on 3 ton unit.
3/4 ton: 1-1/8”(28.5mm)
1-1/2 ton: 1-5/16”(33.3mm)
3 ton: 1-7/16”(36.5mm)
.250 (6.3 mm) for 3/4 ton unit
.312 (7.9 mm) for 1-1/2 and 3 ton units