Manitowoc GROVE RT890E Operator's Manual page 58

OPERATING CONTROLS AND PROCEDURES
Lowering the Cable
Push the MAIN or AUX hoist control lever forward, away
from the operator, and hold until the hook or load is lowered
to the desired height.
Raising the Cable
Pull the MAIN or AUX hoist control lever back, toward the
operator, and hold until the hook or load is raised to the
desired height.
Hoist Speed Range Selection
CAUTION
Do not change the hoist speed range with the hoist
rotating.
To change the speed range of the hoist(s), position the
applicable switch (MAIN HOIST SPEED or optional AUX
HOIST SPEED) to HIGH or LOW as applicable
Raising and Lowering the Hydraulic Boom Extension
The normal operating range for lifting loads with the
hydraulic boom extension is an extension offset of 5 - 40
degrees. The extension must be retracted to 0 degree offset
for stowage on the side of the boom.
The hydraulic luffing boom extension is controlled by two
switches in the seat on the left hand seat armrest. The
extension is controlled by an ON/OFF switch and a RAISE/
Anti-Two Block
Assembly
3-22
Remote Switch Station
Retainer Pin
6217-2
L O W E R s w i t c h . S e e S E C T I O N 3 - O P E R AT I N G
C O N T R O L S A N D P R O C E D U R E S f o r l o c a t i o n a n d
description of these switches.
The boom extension may also be controlled by two remote
stations on the extension. The first station is located on the
boom extension adapter section, while the second station is
located at the head of the boom extension base section.
Raising the Hydraulic Boom Extension
The luffing jib ON/OFF switch must be in the ON position.
Push the luffing jib RAISE/LOWER switch to the RAISE
position and hold until the extension is raised to the desired
position or a switch-off point is reached.
To raise the extension to 0 degree offset for extension
stowage, the load moment indicating (LMI) system must be
overridden. See the manufacturer's LMI Operating Manual
supplied with the crane for instructions.
To raise the extension at the remote stations, press switch
2401 at the extension adapter or switch 2403 at the head of
the base section (see Figure 4-1).
Lowering the Hydraulic Boom Extension
When lowering the boom extension, simultaneously let
out the hoist cable to prevent two-blocking the extension
sheave and the hook block or headache ball.
Remote Switch Station
Mounting Brackets
6217-3
RT890E
WARNING
6217-1
LMI Control Box
FIGURE 3-3