CM-ET Series 653 - Manual (Page 8)

INSPECT HOIST
Before each use and at specified
intervals as directed in the inspection
section.
1. DO NOT exceed capacity shown on
nameplate.
2. DO NOT use to lift people or loads over
people.
3. DO NOT use unless the hoist’s frame and
chain form a straight line between hooks.
4. DO NOT use if the frame is in contact with
any object.
5. DO NOT use if the unit is damaged or
malfunctions.
6. DO NOT use extension on lever. Use hand
power only.
7. DO NOT use if chain is twisted, kinked or
damaged.
Maintenance
INSPECTION
To maintain continuous and satisfactory
operation, a regular inspection
procedure must be initiated so that
worn or damaged parts can be replaced
before they become unsafe. The
intervals of inspection must be
determined by the individual
application and are based upon the
type of service to which the hoist is
subjected. The intervals indicated as
follows are based on normal service.
The inspections are divided into two
general classifications designated as
“frequent” and “periodic”.
FREQUENT INSPECTIONS
These inspections are usually visual
examinations by the operator. Frequent
inspections are to be performed daily
or before each use and they are to
include:
1. Braking mechanism for evidence of
slippage.
2. Operation of the directional lever
for free movement.
3. Load chain for lubricant, wear,
damaged links or foreign material.
4. Hooks for damage, cracks, twists,
latch engagement and latch
operation.
PERIODIC INSPECTIONS
These are visual inspections of external
and internal conditions by a designated
person making records to provide the
basis for continuing evaluation of the
condition of the hoist. The periodic
inspection should include those items
listed under frequent inspection as well
as the following:
1. Chain for excessive wear or stretch
(See Figures 6 and 7, page 6) - every
three months.
2. Worn, cracked or distorted parts
such as lower hook block, upper
hook block, upper hook pin, chain
guide rollers, bushings, lever, brake
cover, free chaining knob, directional
pawl, friction hub and lever ratchet
- every three months.
3. Inspect for wear on the tip of the
pawls, teeth of the ratchet, and
pockets of the liftwheel - every three
months.
4. Loose or missing bolts, nuts, pins or
rivets - every three months.
5. Inspect the brake components for
worn, glazed or contaminated
friction discs and scoring of the
friction hub and ratchet. Replace
friction washers if contaminated,
glazed or if thickness is less than
0.094 in. (2.4 mm) - every three
months.
6. Corroded, stretched or broken pawl
springs, directional lever pawl spring
and lever ratchet spring - every three
months.
7. Hooks - dye penetrant, magnetic
particle or other suitable crack
detecting inspection should be
performed at least once a year, if
external conditions indicate there has
been unusual usage.
8. Nameplate and Warning Labels for
legibility and retension-every three
months.
9. Chain stop in place and properly
secured - every three months.
Any deficiency should be corrected
before the hoist is returned to service.
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 parts deemed unserviceable are to
be replaced with new parts before the
hoist is returned to service. It is very
important that the unserviceable parts
are destroyed and properly disposed of
to prevent their possible future use as a
repair item.
When the unit is subjected to heavy
usage or dusty, gritty, moist or corrosive
atmospheric conditions, shorter time
periods must be assigned. Inspection
must be made of all parts for unusual
wear, corrosion or damage, in addition
to those specifically mentioned in the
schedule.
HOOK INSPECTION
Hooks damaged from chemicals,
deformations or cracks, or that have
more than a 10° twist from the plane of
the unbent hook, excessive opening or
seat wear, must be replaced. Also,
hooks that are opened to the extent
that the latch does not engage the tip
must be replaced. Any hook that is
twisted or has excessive throat opening
indicates abuse or overloading of the
hoist. Other load sustaining parts
should be inspected for damage.
3/4 1 ¼
1 1 ¼
1½ 1 3 /
8
2 1½
3 1 23 /
32
6 2 5 /
16
Check to assure the latch is not
damaged or bent and that it operates
properly. It should have sufficient
spring pressure to keep it tightly
against the tip of the hook and allow it
to spring back to the tip when released.
If the latch does not operate properly,
replace the latch.
The chart above should be used to
determine when the hook must be
replaced.
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 Page 6). If trouble
persists, inspect chain and mating parts
for wear, distortion or other damage.
Use as directed above. Failure to do so
may cause injury to you or others.
5
Depress latch to
measure throat
opening
Figure 5 - Hook Inspection
Hoist Replace Hook When
Capacity Opening is Greater
(Tons) Than: (in.)