Grove Published 11-22-2016, Control # 345-12 4-41
RT9130E-2 SERVICE MANUAL BOOM
BI-FOLD SWINGAWAY BOOM EXTENSION
Description
A 59 ft (18m) two stage, offsetable swingaway boom
extension is provided to obtain additional boom reach. The
fly swingaway section is a 23 ft (7m) section. The base
section is a 36 ft (11m) section.
The boom extension mounts directly to the boom nose
utilizing a four point attachment. In addition, the swingaway
can be stowed on the right side of the boom base section.
Refer to the Operator’s Manual to install, deploy or remove
the extensions.
Identification
The maximum boom extension consists of the 59 ft two-
stage swingaway lattice extension and two boom extension
inserts. The boom extension is designed for the crane it was
delivered with. The parts belonging to the crane have the
same serial number as the crane.
The following parts are labelled with the serial number:
• all parts of the 59 ft (18m) two-stage swingaway lattice
extension
• both 26 ft (8 m) boom extension inserts.
If you wish to use the boom extension on several Grove
cranes, the parts of the boom extension must be adjusted for
these cranes and labelled with all of the respective serial
numbers.
HOOKBLOCK
Description
A 130 ton (118 metric ton) hookblock, a 80 ton (72 metric ton)
hookblock, and a 10 ton (9 metric ton) top swivel overhaul
ball are available for the crane. The hookblocks utilize a one-
piece pivot block and the hook is equipped with a safety
latch. Both hookblocks are the quick reeve design.
Maintenance
Periodic Maintenance
It is recommended that the hookblock and/or headache ball
be inspected every 50 hours. A complete disassembly
inspection should be conducted every quarter or 500 hours
in the area of the hook, hex nut, and threaded areas for
corrosion and proper fit. After assembly of the hook, a liberal
coating of multipurpose grease should be applied to the nut
and threaded areas by brush or hand to prevent corrosion.
For hookblocks and other load handling devices not
manufactured by Grove; follow the manufacturer’s
inspection and testing recommendations to assure an
adequate preventative maintenance program is established.
CAUTION
Operate the crane only with those sections of the boom
extension which have the same serial number as the
crane. This prevents malfunctions and damage.
CAUTION
Have the adjustment of the boom extension carried out
only by your local Grove distributor or Manitowoc Crane
Care.
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