14
P/N: 192047082 (REV AD) 627NH
March 2022
VARIABLE SPEED ELECTRIC CHAIN HOIST WITH
OPTION
Figure 15. Thermochromic Label
INSPECTION
To maintain continuous and satisfactory operation, a regular
inspection procedure must be initiated to replace worn or damaged
parts before they become unsafe. Inspection intervals must be
determined by the individual application and are based on the type
of service to which the hoist will be subjected.
The type of service to which the hoist is subjected can be classifi ed
as “Normal,” “Heavy,” or “Severe.”
Normal Service:
Involves operation with randomly distributed loads within the rated
load limit, or uniform loads less than 65% of rated load for not more
than 25% of the time.
Heavy Service:
Involves operating the hoist within the rated load limit which exceeds
normal service.
Severe Service:
Normal or heavy service with abnormal operating conditions or
constant exposure to the elements of nature.
Two classes of inspection - frequent and periodic -
must be performed.
Frequent Inspections:
These inspections are visual examinations by the operator or other
designated personnel. Records of such inspections are not required.
The frequent inspections are to be performed monthly for normal
service, weekly to monthly for heavy service, and daily to weekly for
severe service, and they should include those items listed in Table 6.
Periodic Inspections:
These inspections are visual inspections of external conditions by an
appointed person. Records of periodic inspections are to be kept for
continuing evaluation of the condition of the hoist.
Periodic inspections are to be performed yearly for normal service,
semi-annually for heavy service and quarterly for severe service, and
they are to include those items listed in Table 7.
CAUTION: Any defi ciencies found during inspections are to be
corrected before the hoist is returned to service. Also, the exter-
nal conditions may show the need for disassembly to permit a
more detailed inspection, which, in turn, may require the use of
nondestructive-type testing.
PREVENTIVE MAINTENANCE
In addition to the above inspection procedure, a preventive
maintenance program should be established to prolong the useful
life of the hoist and maintain its reliability and continued safe use.
The program should include the periodic and frequent inspections
with particular attention being paid to the lubrication of the various
components using the recommended lubricants (see online
parts resource).
SUSPENSION INSPECTION CRITERIA
BRACKETS
- Replace any cracked or distorted brackets.
BOLTS
- If the suspension is removed for any reason, including
inspection, the suspension bolts should be replaced.
NYLON THREAD LOCKING NUTS
- It is not necessary to replace
the nylon thread locking nuts each time the suspension bolts are
replaced as long as new bolts with the locking patch are being used.
It is recommended that the nylon thread locking nuts are replaced
each time the hoist is torn down to allow these nuts to be replaced.
HOOK REMOVAL CRITERIA
Based on ASME B30.10, hooks shall be removed from service if
damage such as the following is visible and shall only be returned to
service when approved by a qualifi ed person:
a. Missing or illegible rated load identifi cation or illegible hook
manufacturer’s identifi cation or secondary manufacturer’s
identifi cation.
b. Excessive pitting or corrosion.
c. Cracks, nicks, or gouges.
d. Wear – any wear exceeding 10% of the original section
dimension of the hook or its load pin.
e. Deformation – any visibly apparent bend or twist from
the plane of the unbent hook.
f. Throat opening – any distortion causing an increase in
the throat opening of 5%, not to exceed 1/4” (6 mm).
g. Inability to lock – any self-locking hook that does
not lock.
h. Inoperative latch – any damaged latch or malfunctioning latch
that does not close the hook’s throat.
i. Thread wear, damage, or corrosion.
j. Evidence of excessive heat exposure or unauthorized welding.
k. Evidence of unauthorized alterations such as drilling,
machining, grinding, or other modifi cations.
"A" MAX.
A
A
"B" MIN
"A" MAX
B
B
"B" MIN
Section A-A
Section B-B
Figure 16. Hook Inspection
Table 5. Hook Inspection Dimensions
Models
Latch Type Hook
Latchlok
®
Hook
"A" Max
"B" Min
"A" Max
"B" Min
A, AA, B, C & F
1.19"
(30.2 mm)
0.91"
(23.1 mm)
1.48"
(37.7 mm)
0.75"
(18.8 mm)
E, H, J & L
1.31"
(33.3 mm)
1.08"
(27.5 mm)
1.48"
(37.7 mm)
0.75"
(18.8 mm)
R
1.50"
(38.1 mm)
1.43"
(36.2 mm)
1.92"
(48.8 mm)
0.94"
(23.9 mm)
RT
1.50"
(38.1 mm)
1.43"
(36.2 mm)
2.50"
(63.5 mm)
1.19"
(23.9 mm)
