Hydraulic Pumps; Front Steering Control Valve; Integrated Outrigger/Rear Steer Manifold - Manitowoc Grove RT530E-2 Service And Maintenance Manual

RT530E-2 SERVICE MANUAL
Symptom
3. Steering is erratic left and right.

Hydraulic Pumps

Description
Front Steer
The hydraulic pump is mounted off of drive pads of the
torque converter and driven by the engine. Pump number 2
provides the hydraulic flow necessary to power the front
steer cylinders and swing circuit. The pump is a gear type
pump that provides a flow of approximately 82.9 l/min (21.9
gpm).
Rear Steer
The hydraulic pump is mounted off of drive pads on the
torque converter and is driven by the engine. Pump number
1 supplies oil to the integrated outrigger/rear steer valve,
boom lift, telescope, hoist and pilot function. The pump is an
axial piston pump that provides a flow of approximately
236.2 l/min (62.4 gpm).

Front Steering Control Valve

Description
The steering control valve is located under the dash and is
actuated by a conventional steering wheel and steering
column, providing precise, full hydraulic steering. Precise
steering is accomplished by a metering system within the
valve that is directly connected to the steering column and
wheel.
Maintenance
Removal
1. Tag and disconnect the electrical connector to the valve.
2. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
3. Remove the capscrews and washers and remove the
valve from the steering column.
GROVE
Probable Cause
a. Hydraulic oil low.
b. Clogged or loose hydraulic
lines or fittings.
c. Defective steering control
valve.
d. Defective hydraulic pump.
Installation
1. Secure the valve to the steering column and secure with
the capscrews and washers. 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 connector to the valve as tagged
during removal.
4. Verify proper operation of the valve.
5. Check valve and hydraulic connections for leaks. Make
repairs as needed.

Integrated Outrigger/Rear Steer Manifold

The integrated outrigger/rear steer manifold controls the
outrigger and rear steer circuit. The valve is mounted on the
frame center section to the rear of the front axle.
The manifold is made up of two sections; an inlet section and
a working section.
The inlet section contains a 17,200 kPa/172 bar (2500 psi)
relief valve and a solenoid valve. The solenoid valve is
normally open. It unloads the pump during cranking, and
bypasses oil from the inlet port to the tank port. Activation of
either the outriggers or the rear steer circuit energizes the
solenoid valve to close and allow oil to flow to the selected
circuit.
The rear steer section contains a three position four way
solenoid controlled directional valve that controls left and
right rear steer.
The outrigger section contains a three position four way
solenoid controlled directional valve, two check valves and
two load sense valves, that controls outrigger extend and
retract.
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.
Published 4-22-15, Control # 556-00
UNDERCARRIAGE
Solution
a. Refill hydraulic reservoir.
b. Clean or tighten lines or
fittings.
c. Repair or replace valve.
d. Repair or replace pump.
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