CM-ET Series 622 - Manual (Page 6)

WARNING
Allowing the load to bear against the hook latch and/or hook tip can result in
loss of load.
TO AVOID INJURY:
Do not allow the load to bear against the hook latch and/or hook tip. Apply
load to hook bowl or saddle only.
!
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 will be subject-
ed. The inspection of hoists is divided into two general classifications designated as
“frequent” and “periodic”.
Frequent Inspections:
These inspections are usually visual examinations by the operator or other designat-
ed personnel. The frequent inspections are to be performed daily or monthly and
shall include the following items:
a. Braking mechanisms for evidence of slippage — daily.
b. Load Chain for lubricant, wear, damaged links or foreign
material — daily. See below.
c. Hooks for damage, cracks, twists, latch engagement and latch operation —
monthly. See below.
Any deficiencies noted are to be corrected before the hoist is returned to service.
Periodic Inspections:
These are visual inspections by an appointed person who makes records of appar-
ent external conditions to provide the basis for a continuing evaluation. For normal
service, the periodic inspections are to be performed yearly and for heavy service,
the periodic inspections are to be performed semi-annually.
Due to the construction of the hoist, it will be necessary to partially disassemble the
unit to perform the periodic inspections. The periodic inspections are to include
those items listed under frequent inspections as well as the following:
a. Chain for excessive wear or stretch. See below.
b. Worn, cracked or distorted parts such as hook blocks, hoist hanger, chain
guide, stripper, loose end pin, shafts, gears, hook collar and bearings.
c. Inspect for wear on the tip of the pawl, teeth of the ratchet and pockets of the
liftwheel and handwheel.
d. Loose or missing bolts, nuts, pins or rivets.
e. Inspect brake components for worn, glazed or contaminated friction discs and
scoring of the handwheel hub, ratchet and friction hub. Replace friction discs
if the thickness is less than 0.044 in. (1.12 mm) on 1/2 & 1 ton units and 0.059
in. (1.50 mm) on 2, 3, 5 and 10 ton units.
f. Corroded, stretched or broken pawl spring.
g. Free movement of the pawl on the pawl stud. Also, apply a thin coat of
lubricant to the pawl stud (see page 6) before reassembling the unit.
5
MAINTENANCE
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.
Also, hooks that are opened and those that allow the latch to disengage the tip, must
be replaced.
Any hook that is twisted or has excessive throat opening indicates abuse or over-
loading of the unit. Other load-sustaining components of the hoist should be
inspected for damage.
The chart below should be used to determine when the hook must be replaced. To
measure throat opening, depress the latch against the hook body as shown below.
Hoist
Rated Load
Tons (Kg.)
1 ⁄
2
(500)
1 (1000)
2 (2000)
3 (3000)
5 (5000)
10 (10000)
Replace Hook When
Opening Is Greater Than:
Inches mm
1.00 25.3
1.20 30.5
1.43 36.8
1.65 41.8
2.10 53.2
2.58 65.5
MEASURE
OPENING
HOOK THROAT OPENING
Also, 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 should be replaced.
LOAD CHAIN
Cleaning and Inspection
First 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 and exces-
sive wear or stretching. Worn chain should be gaged throughout its entire length
and replaced if beyond serviceable limits.
To determine if load chain should be continued in service, check gage lengths as
indicated in figure below. Chain worn beyond length indicated, nicked, gouged or
twisted 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 serviceable 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 section on Reeving Load Chain (page 7).
13. Never operate the hoist when flammable materials or vapors are present.
Sharp contact between metal parts can produce sparks that can cause a fire
or explosion.
14.STAY ALERT! Watch what you are doing and use common sense. Do not use
the hoist when you are tired, distracted or under the influence of drugs,
alcohol or medication causing diminished control.
11. Do not use this or any other overhead materials handling equipment for lifting
persons.
12. Do not allow the load to bear against the hook latch. The latch is to help
maintain the hook in position while the chain is slack before taking up slack
chain.
NUMBER OF
LINKS IN GAGE GAGE
LENGTH
WARNING
Power operation may result in structural damage or premature wear that may
cause a part to break and allow the load to fall.
TO AVOID INJURY:
Operate Series 622 Hoists using hand power only.
!
h. Hooks — dye penetrant, magnetic particle or other suitable crack-detecting
inspections should be performed at least once a year, if external conditions
indicate there has been unusual usage.
Any deficiencies noted are to 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 nondestructive-type testing.
Any parts that are deemed unserviceable are to be replaced with new parts before
the unit is returned to service. It is very important that the unserviceable parts be
destroyed to prevent possible future use as a repair item and properly disposed of.