Manitowoc Grove GRT8120 User Manual

5-52 Published 3-22-2021, Control # 702-02
SET-UP AND INSTALLATION GRT8120 OPERATOR MANUAL
Hydraulic Boom Extension Connections
Use the following procedures to connect and disconnect the
optional hydraulic boom extension to the main boom.
Disconnect and retract the hydraulic lines from the boom
nose whenever the operation of the crane does not require
hydraulic power. This will extend the life of the hose drum,
hoses, and associated hardware. For more information, see
Retracting Hydraulic Hoses for Main Boom Operation, page
5-53.
Checking the Locking Device on the Hose Drum
The hose drum on the side of the main boom provides the
hydraulic supply to the boom nose/luffing boom extension.
The hose drum is equipped with a locking device. The drum
must be unlocked before operation.
If the hose drum has to be removed, the drum must be
locked.
Holes (1, Figure 5-73) are distributed on the inner wheel of
the hose drum. Rotating the latch (2) engages one of the
holes to lock the drum, preventing it from turning.
Unlocking the Drum
Rotate the latch (2, Figure 5-73) clockwise (A), to disengage
it from the hole.
Locking the Drum
1. Turn the hose drum until a hole is aligned with the latch
(2, Figure 5-73).
2. Rotate the latch (2) counterclockwise to position (B),
until the latch fully engages the hole.
Hydraulic Hose Installation
1. Unlock the hose drum.
2. Remove the hinged pins (1, Figure 5-74) and fold up the
guide sheaves (2).
3. Remove the strain relief (3) from its main boom
mounting bracket (4) and pull the hydraulic hoses (5)
towards the boom nose.
4. Hook the strain relief onto the boom nose mounting
bracket (6).
CAUTION
Equipment Damage Hazard!
Always verify the drum is unlocked before using
extensions or other equipment that require hydraulic
power. Damage to hydraulic hoses or the boom may
occur.
CAUTION
Spring Loaded Equipment Hazard!
The drum must be locked before removal. The drum is
spring loaded and must be locked to prevent damage or
injury.
CAUTION
Spring Loaded Equipment Hazard!
If the strain relief is detached after the locking device has
been released, do not under any circumstances let go of
the strain relief before it has been re-attached. If you let go
of the strain relief, the hydraulic hoses will spring back
uncontrollably due to the spring force in the hose drum
and may injure persons or damage parts of the crane.
FIGURE 5-73
7567-34
1
2
B
A
1

Manitowoc Grove GRT8120 Specifications

General

Brand	Manitowoc
Model	Grove GRT8120
Category	Construction Equipment
Language	English