BOOM RT770E SERVICE MANUAL
4-56
Published 11/26/2014, Control # 447-05
HOOK BLOCK
Description
A 60 t (65 US ton) hook block and a 7.5 t (8.3 US ton)
overhaul top swivel ball are available for the crane. The hook
block utilizes a one-piece pivot block and the hook is
equipped with a safety latch. The hook block is of quick-
reeve design and meets ANSI B30.5 and CE standards. The
hook block weighs 850 kg (1275 lb). Grease fittings are
provided to ensure lubrication of all moving parts.
Maintenance
Periodic Maintenance
It is recommended that the hook block 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 hook blocks 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.
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