Manitowoc Grove GRT880 User Manual

Grove Published 3-25-2020, Control # 643-04 4-3
GRT880 OPERATOR MANUAL SET-UP AND INSTALLATION
4
ANTI-TWO-BLOCK (A2B) SWITCH
If a hoist rope has been reeved and two A2B switches are
installed, the unused A2B switch must be locked (disabled)
to allow all crane operations.
Locking
1. Remove A2B weight.
2. (A) Remove cap (1) from switch.
3. Pull lanyard (2) down.
4. (B) Secure lanyard (2) in this position using cap (1). A2B
switch is locked (disabled).
Unlocking
NOTE: Always remove the switch lock (enable) before
installing an A2B weight around the hoist rope.
1. (A) Pull down lanyard (2) and remove cap (1). Switch is
unlocked (enabled).
2. (B) Install cap (1) on A2B switch.
Checking Before Operation
Check the following electrical connections before operating
the crane to ensure the RCL system is properly connected
for the crane configuration.
Cranes with Main Hoist Only
If the crane is operated only with the boom and without boom
extension or lattice insert, no additional connections are
necessary. It must however be ensured that the A2B switch
weight is correctly mounted on the main boom hoist rope.
With even numbers of rope lines, the lifting limit switch
weight shall be attached to the “dead end” of the hoist rope.
With odd numbers of rope lines, the lifting limit switch weight
shall be attached to the rope line with the lowest operating
speed.
If the crane is operated with a main boom extension or top
section, the connecting cable must be mounted between the
distributor socket on the extension or insert, and the
distributor socket on the main boom. The main boom A2B
switch weight must be disconnected and mounted on the
extension or fly section A2B switch.
CAUTION
If the A2B switch is locked (disabled), the hook block
could hit the main boom head or extension, resulting in
damage to the hook block, main boom head or extension,
and hoist rope. Never lock an A2B switch with a switch
weight attached.
FIGURE 4-4
8684-1
WARNING
Failure to reposition the A2B weight will prevent the A2B
system from functioning properly. No weight shall be
mounted on the A2B switch of the main boom when
working with the extension/top section.
FIGURE 4-5
8684-2

Manitowoc Grove GRT880 Specifications

General

Brand	Manitowoc
Model	Grove GRT880
Category	Construction Equipment
Language	English