Manitowoc Grove RT540E Service Maintenance Manual

HYDRAULIC SYSTEM RT540E SERVICE MANUAL
2-30 Published 4-20-2015, Control # 502-01
DIRECTIONAL CONTROL VALVES
Description
The directional control valves direct and control hydraulic oil
flow from the pumps to the boom lift and telescope cylinders,
each hoist motor, the swing motor, and the front steer
cylinders from the front steer control valve. The boom lift/
telescope/hoist directional control valve (Figure 2-15) is
located on the outside of the right superstructure side plate.
The valve bank is removed and installed as an assembly.
The boom lift/telescope/hoist control valve is a three
position, four way pressure compensated, closed center
directional valve. It receives pump flow from hydraulic swivel
port 6 and pump No. 1. Lift, telescope and hoist (s) functions
are controlled by proportional two position two way solenoid
cartridges installed into the valve’s casting under each spool.
These valves receive an electrical signal from the controllers
on the cab armrest.
RCL lockout is achieved by de-energizing the proportional
solenoids.
The inlet section of the boom lift/telescope/hoist directional
control valve contains a load sense relief valve set at 27,579
kPa/275.7 bar (4000 psi) protecting the main and auxiliary
hoist and boom lift sections. The boom lift retract has a
thermal port relief set of 29,647.4kPa/296.4 bar (4300 psi).
The telescope section has port reliefs set at 18,616 kPa/
186.2 bar (2700 psi) and 20,684 kPa/207 bar (3000 psi).
The swing directional control valve is installed on the outside
of the right superstructure side plate. Refer to Accessory
With Swing Directional Control Manifold, page 2-33.
Maintenance
Boom Lift/Telescope/Hoist Valve Bank
Removal
1. Tag and disconnect all of the electrical connectors from
the valve.
2. Tag and disconnect the hydraulic lines from the valves.
Cap or plug the lines and ports.
NOTE: The lift/telescope/hoist valve bank weighs
approximately 81.30 kg (179.2 pounds).
3. Remove the capscrews, washers and nuts securing the
valve bank and remove the valve bank.
Boom Lift/Telescope/Hoist Valve Bank
Installation
1. Place the valve bank on the superstructure side plate
and secure it with the capscrews, washers and nuts.
Torque the capscrews see Fasteners and Torque
Values, page 1-11.
2. Connect the hydraulic lines to the valves as tagged
during removal.
3. Connect the electrical connectors as tagged during
removal.
Functional Check (All Valve Banks)
1. Start the engine and run it at normal speed.
2. Operate the control levers of the valve bank(s). Check
for smooth operation of cylinders and motors.
3. Check the valve bank(s) and lines for leakage. Make
repairs as needed.
Function Check - RCL Lockout Valves
1. Remove circuit breaker F12 from the power panel in the
cab. This cuts off power to the RCL.
2. Start the engine.
3. Try to telescope the boom out, lower the boom, hoist up
the main hoist, and hoist the auxiliary hoist up (if
installed). Verify none of these functions work.
4. Shut down the engine. Reinstall F12.
5. Telescope the boom out, lower the boom, hoist up the
main hoist, and hoist the auxiliary hoist up (if installed).
Verify all of these functions work.
6. Check for leaks. Make repairs as needed.
Reference Only

Manitowoc Grove RT540E Specifications

General

Brand	Manitowoc
Model	Grove RT540E
Category	Construction Equipment
Language	English