Manitowoc Grove RT770E - Description; Hoist Rotation Indicator (HRI) Display System

5-18
Published 11/26/2014, Control # 447-05
HOIST AND COUNTERWEIGHT RT770E
Hoist Rotation Indicator (HRI) Display
System
The HRI Display consists of an LED display that indicates
the direction the hoist(s) are rotating, pressure switches that
monitor hydraulic pilot pressure, and a control module
mounted in the cab.
Pressure Switches
The pressure switches are located on the main control valve
Figure 5-10. The switch contacts close at 75 psi (5.17 bar).
HRI Display
The display is located in the front overhead panel
Figure 5-11.
To replace the display, remove the overhead panel.
Disconnect the electrical connector and pry the display off of
the panel. Clean the panel where the display was affixed with
isopropyl alcohol, remove the paper from the adhesive back
of the new display and stick it into the panel. Connect the
wires to the display. Replace the panel and secure with the
hardware.
HRI Control Module
The control module is located in the fuse and relay panel
behind the driver’s seat in the cab Figure 5-12.
To replace the control module, tag and disconnect the wires
from the module Figure 5-13. The module is mounted to the
bulkhead using double-sided adhesive tape. To remove the
module, p
ry it off the bulkhead. Remove any residual tape
from the bulkhead. Secure the replacement module to the
bulkhead with the foam tape. Connect the wires as tagged
during removal.
FIGURE 5-10
8425-5
Item Description
1 Main Hoist Down Switch
2 Auxiliary Hoist Down Switch
3 Auxiliary Hoist Up Switch
4 Main Hoist Up Switch
1
2
4
3
FIGURE 5-11
FIGURE 5-12
8425-2
TYPICAL VIEW