Manitowoc Grove GMK6300L Operating Manual page 302

Driving modes
6.4 Main boom, removing/installing
6.4.6
Derricking
cylinder support
Operating the
lifting device
S
6 - 30
Connecting/disconnecting the derricking cylinder from the
boom
The derricking cylinder head axle is retracted and fitted with a pulling
device.
Before retracting the head pin, the derricking cylinder support must be
erected.
A lifting device is needed in order to relieve and level the derricking cylinder.
Danger from using unsuitable lifting device!
Have the lifting device serviced in time before the maintenance interval
specified on the label expires.
•
Place the derricking cylinder support (1)
between the holders (2).
•
Set down the main boom on the boom rest.
•
Attach the lever in the holder (2).
(A) – Raise
•
Close the drain plug (1) and pump the lever.
The piston rod (3) extends.
(B) – Lower
•
Slowly open the drain plug (1).
The piston rod (3) retracts.
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