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8.0 Hook wear limits

Figure 8-1 shows normal hook measurements A, B and C. The hook must be replaced if any distortion causes a

10% or more change in these dimensions. Never heat-treat the hook or attach anything to the hook by welding.

NOTE: Excessive hook throat opening or twist indicates abuse or overloading of the hoist. If such deformation is

discovered, inspect the hoist and all supporting members very carefully for additional indications of excessive

hoist loading.

Hook Limits for JWS-series Web Strap Hoists

Normal Replace

If = or > than

A 29 mm (1.14 in.) 32 mm (1.25 in.)

B 15.1 mm (0.59 in.) 16.6 mm (0.65 in.)

C 15 mm (0.59 in.) 16.5 mm (0.65 in.)

Table 2 Figure 8-1

9.0 Inspection and maintenance

All repairs and adjustments are to be performed by qualified persons using procedures

that are approved for the hoist system being serviced. All safety-related deficiencies discovered in the

inspection are to be corrected before hoist is placed back into service.

Read and follow all relevant ANSI Inspection and Maintenance standards, particularly ANSI/ASME B30.21 Lever

Hoists. Know the meaning of Frequent Inspection, Periodic Inspection, Normal Service, Heavy Service, and

Severe Service. It is the customer’s responsibility to understand and follow all ANSI and JET inspection and

maintenance instructions.

The following definitions are based upon ANSI/ASME B30.21.

Normal Service: 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: Operation within rated load limit, which exceeds normal service.

Severe Service: Normal or heavy service with abnormal operating conditions.

Designated Person: A person selected or assigned as being competent to perform the specific duties to

which he/she is assigned.

Qualified Person: A person who, by a recognized degree or certificate of professional standing, or who, by

extensive knowledge, training, and experience, has successfully demonstrated the ability to solve or resolve

problems relating to the subject matter and work.

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Jet JWS Series Specifications

General