HYDRAULIC SYSTEM GRT8100 SERVICE MANUAL
2-66
Published 3/26/2018, Control # 596-05
DUAL ACCUMULATOR CHARGE MANIFOLD
VALVE
Description
The dual accumulator charge manifold valve (Figure 2-36) is
located on the inside of the left superstructure side plate
(Figure 2-18). The valve provides pressure regulation to the
service brake circuit.
The dual accumulator charge valve consists of a flow divider
spool, cut-in/cut-out spool, check valve and two sequence
valves. The LS port of the manifold valve is connected to the
pump when the accumulator pressure reaches the cut-in
setting [134 bar (1950 psi)]. The pump will deliver the
required charge flow to charge the accumulators. When the
cut-out setting of 160 bar (2320 psi) is reached, the cut-in/
cut-out spool shifts to vent the LS line to tank. The sequence
valves isolate the two accumulators. If one of the
accumulator loses pressure, the other accumulator will
continue to charge and provide flow to the brake circuit when
required.
Maintenance
Removal
1. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
2. Remove the three bolts, washers, and lockwashers
securing the valve to the turntable. Remove the valve.
Installation
1. Position the valve on the superstructure with ports A1,
A2, and B3 facing up and secure with three bolts,
washers, and lockwashers. Torque bolts.
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.
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