Range Shift/Parking Brake Valve; Description; Maintenance - Manitowoc Grove RT530E-2 Service And Maintenance Manual

RT530E-2 SERVICE MANUAL

RANGE SHIFT/PARKING BRAKE VALVE

Description

The range shift/parking brake valve controls the flow of oil to
the parking brake, hi-low range and axle disconnect
actuators by the use of two solenoid valves (Figure 2-25).
The valve is located on the center of the frame. Pressure is
supplied to the valve from the transmission charge pump.
The parking brake solenoid valve is a two position three-way
valve. In its de-energized position, the inlet port is blocked
and the parking brake actuator is drained to the reservoir.
When the solenoid is energized, the reservoir port is blocked
and pressurized oil is directed to the actuator, releasing the
parking brake.
The range shift solenoid valve is a two position four-way
valve. In its de-energized position, pressurized oil flows to
the "B" port of the range shift actuator, while the "A" port is
drained to the reservoir along with the axle disconnect
actuator for two wheel drive/high range. When the solenoid
is energized, pressurized oil is directed to the "A" port of the
range shift actuator hydraulic spring release while port "B" of
the range shift actuator is drained to the reservoir for four
wheel drive/low range.
Item
1 Port P - Pressure
2 Port T - Tank
3 Port A - Range Shift Actuator
4 Port B - Range Shift Actuator
5 Port PB - To Park Brake
6 Solenoid Valve - Range Shift
7 Solenoid Valve - Park Brake
8 Pressure Switch
8
2
GROVE

Description

4
5 3
7
Hydraulic Schematic
Published 4-22-15, Control # 556-00

Maintenance

Removal
1. Tag and disconnect the electrical connectors to the
valve.
2. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
3. Remove the capscrews, lockwashers, flatwashers and
nuts securing the valve to the frame. Remove the valve.
Installation
1. Secure the valve to the frame with the nuts, flatwashers,
lockwashers and capscrews. Torque the capscrews see
Fasteners and Torque Values (pg 1- 12).
2. Connect the hydraulic hoses to the ports on the valve as
tagged during removal.
3. Connect the electrical connectors to the valve as tagged
during removal.
Functional Tests
1. Start and idle engine.
2. With units on outriggers, check for proper two/four wheel
operation.
6
2
1
6697-2
HYDRAULIC SYSTEM
7
6
8
5
3
4
6697-1
FIGURE 2-25
2
1
2-49