Maintenance work on the superstructure
8.7 Slewing gear
8 - 50 3 302 577 en Maintenance manual
GMK7450
16.08.2018
8.7.2 Checking for leaks
•
Pay attention to any unusual running noises from the slewing gears.
• Check the slewing gears and the connections for leaks. If consumables are
leaking;
à Checking the oil level, P. 8 - 49.
• Check that pipes and hoses are tightly connected and undamaged.
If any damage is found, report it to
Manitowoc Crane Care or an authorised
GROVE dealer or your repair crew.
8.7.3 Checking the slewing gear brake
Prerequisites – The crane must be rigged with an outrigger span of at least 8.76 x 8.90 m
(28.7 x 29.2 ft) and be level;
à Operating manual.
– The Mega-Wing-Lift, lattice extension and auxiliary hoist are removed.
– A suitable counterweight combination allowing a steeply raised main
boom to be slewed ov
er a range of 360° is rigged according to the
lifting
capacity table
.
• Be sure to first obtain detailed information from Manitowoc Crane Care.
– The RCL code for the current rigging mode must be entered;
à Operating
manual
.
– The current load must not exceed 1 t (2 200 lbs) – if n
ecessary unreeve the
hook block.
– The slewing range 360° around the truck crane must be secured.
– The main boom must be raised to 65° and fully retracted.
G
Risk of overturning while slewing!
Always set a rigging mode for the slewing range of 360° in accordance with
the
lifting capacity table and enter the corresponding RCL code. Do not over-
ride the rated capacity limiter (RCL).
G
Risk of injury due to swinging hook block!
If a faulty slewing gear brake slips, the superstructure can accidentally, sud-
denly turn and the hook block can suddenly swing. People standing within
the slewing range could be injured.
Secure th
e slewing range 360°, before you check the slewing gear brake.
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