TM 5-3810-288-12
Figure 3-16. Toggle linkage adjustment.
intervals listed in the lubrication order. When removed
(2) Replacement. Lower the hook block to the ground or
from the machine, the crane boom should be placed
to suitable blocking. Loosen the cable clamp at the
inside a suitable dry building if possible, preferably
cable dead end. This may be at the boom point or the
supported on wooden blocking. Clean the crane boom,
hook block, depending on the number of parts of line in
using a cleaning solution. All machined or finished
use. Manually unreeve the hook block. Refer to the
surfaces must be kept lubricated, as required, to prevent
reeving diagram, figure 2-15, and replace the hook block.
rust.
d. Jib and Jib Strut Service and Replacement.
b. Cable Roller and Boom Point Sheave Service.
Service and replacement procedures for the jib
and jib strut are described below.
Refer to figure 3-21 and clean the cable rollers and boom
(1) Service. Service of the jib and jib strut is the
point sheaves with a cleaning solution. Inspect for wear,
same as for the crane boom. Refer to paragraph 3-28
scoring, or grooving caused by contact between cables
(a) and service the jib and jib strut.
and rollers or sheaves. Report any such discrepancy to
(2) Replacement. Refer to figure 3-23 and replace
higher authority.
the jib and jib strut.
c. Hook Block Service and Replacement. The
e. Cable Replacement. Replacement procedures
operator's responsibility in regard to hook block service
for cables are described below.
and the method of replacement are outlined below.
(1) Replacement of load cables. To replace either
(1) Service. The hook block (fig. 3-22) must be
the front or the rear drum load cable, place the drum
kept clean. Keep the hook block sheaves lubricated with
brake for the cable to be removed in the brake released
proper lubricant in accordance with the lubrication order.
position. Refer to paragraph 3-28(c) and remove the
The hook block must be inspected by the operator daily,
hook block. Raise the boom to any convenient height so
since failure could cause serious damage or injury. The
that the line hangs downward One man can now pull the
operator must inspect for visible cracks or noticeable in
cable off the drum. When the cable end is reached,
crease in hook throat measurements, and report any
refer to
evidence
of
a
defect
to
proper
authority.
3-18
