(2) Replacement. Lower the hook block to
the ground or to suitable blocking. Loosen the cable
clamp at the cable dead end. This may be at the boom
point or the hook block, depending on the number of
parts of line in use. Manually unreeve the hook block.
Refer to the reeving diagram, figure 2-12, and replace
the hook block.
Figure 3-15. Hook block.
Figure 3-14. Cable roller and boom point sheave service
d. Jib and Jib Strut Service and Replacement.
c. Hook Block Service and Replacement. The
Service and replacement procedures for the jib and jib
operator crew personnel's responsibility for hook block
strut are described below.
service and the method of replacement are outlined
(1) Service. Service of the jib and jib strut is
below.
the same as for the crane boom. Refer to para 3-28 la I
and service the jib and jib strut.
must be kept clean. Keep the hook block sheaves
lubricated with proper lubricant in accordance with the
replace the jib and jib strut.
current LO. The hook block must be inspected by the
operator daily. since failure could cause serious
damage or injury. The operator must inspect for visible
cracks or noticeable increase in hook throat
measurements, and report any evidence of a defect to
organizational maintenance.
3-17
