HYDRAULIC SYSTEM GRT8100 SERVICE MANUAL
2-46
Published 3/26/2018, Control # 596-05
SWING MANIFOLD VALVE
Description
The swing manifold valve (Figure 2-22 and Figure 2-23) is
located on the superstructure side plate near the turntable
bearing (Figure 2-18). A dual pilot-operated, proportional
control valve controls the oil flow from the No. 3 gear pump to
maintain pressure in the left and right swing circuits. Excess
oil from the valve flows back to tank. The left and right swing
functions are controlled by two pilot-operated, solenoid-
controlled proportional valves. An additional solenoid-
controlled valve acts as a “swing enable” valve, which is only
energized when the left or right swing function is actuated.
When energized, this valve sends oil through a pilot line to
shift the dual pilot-operated, proportional control valve to
send full flow from the No. 3 gear pump to the swing circuit.
Maintenance
Swing Manifold Valve Removal
1. Tag and disconnect the hydraulic lines from the valves.
Cap or plug the lines and ports.
2. Tag and disconnect electrical connectors from the valve.
3. Remove the capscrews, flatwashers, and lockwashers
securing the valve. Remove the valve.
Swing Manifold Valve Installation
1. Install the valve on the turntable upright and secure with
the capscrews, flatwashers, and lockwashers. Torque
capscrews. Refer to Fasteners and Torque Values, page
1-15 for proper torque value.
2. Connect the electrical connectors to the valve as tagged
during removal.
3. Connect the hydraulic lines to the valves as tagged
during removal.
4. Remove the capscrews and nuts securing the valve.
Remove the valve.
Functional Check
1. Start the engine and run it at normal speed.
2. Operate the joystick for sing right and left. Check for
proper operation.
3. Check the valve bank(s) and lines for leakage. Make
repairs as needed.
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