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GRT9165 SERVICE MANUAL HYDRAULIC SYSTEM
Published 10-01-2020 Control # 699-00
Swing Directional Control Valve
The swing directional control valve (Figure 2-17) is located
on the superstructure side plate near the turntable bearing
(4, Figure 2-13). A dual pilot-operated, proportional control
valve controls the oil flow from the No. 3 hydraulic pump
through swivel port 5 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.
Swing Directional Control 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 Directional Control 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
1-16 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 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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