Dual Accumulator Charge Valve; Description; Maintenance - Manitowoc Grove RT530E-2 Service And Maintenance Manual

RT530E-2 SERVICE MANUAL

DUAL ACCUMULATOR CHARGE VALVE

Description

The load sensing dual accumulator charging valve is located
on the inside of the left superstructure side plate. The
purpose of the valve is to provide pressure regulation to the
service brake circuit.
The dual accumulator charge valve consists of an inlet main
check valve, a load sense control section with a pilot spool
that controls the pump stroke and an inverted shuttle that
controls the accumulator charging (Figure 2-19).
When the valve is charging the accumulators, the load sense
control section is in neutral position, connecting the load to
the pump by way of the load sense line. This brings the
piston pump No. 1 on stroke to supply fluid for charging.
Fluid passes through the main check valve connecting to the
pilot end and through the spool onward to the inverted
shuttle that connects the accumulators.
When the control pilot spool bias spring senses the low limit
pressure of 13,445 kPa/134 bar (1950 psi), the spool shifts to
the neutral position, allowing the pump to charge the
accumulators to a maximum of 16,000 kPa/160 bar (2320
psi). The inverted shuttle cartridge senses the pressure in
the accumulators to pilot the cartridge closed when
maximum charge pressure is reached. Maximum charge
GROVE
pressure also pilots the control pilot spool to open the load
sense line to tank, destroking the piston pump No. 1.

Maintenance

Removal
1. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
2. Remove the capscrews, flatwashers and lockwashers
securing the valve to the turntable. Remove the valve.
Installation
1. Position the valve on the turntable and secure with the
capscrews, flatwashers, and lockwashers. Torque
capscrews see Fasteners and Torque Values (pg 1- 12).
2. Connect the hydraulic hoses to the valve ports as tagged
during removal.
3. Start the engine and check for leaks. Make repairs as
needed.
4. Depress the brake pedal several times to cause the
brake valve to charge. Make several turns with the
steering wheel, and swing the superstructure left and
right. Verify the brakes, swing, and front steering work
properly.
Published 4-22-15, Control # 556-00
HYDRAULIC SYSTEM
2-37
2