Jet JWS Series, Operating Instructions And Parts Manual

 8

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.