HYDRAULIC SYSTEM RT770E
2-54
Published 11/26/2014, Control # 447-05
HIGH SPEED BOOST SELECTOR VALVE
Description
The high speed boost selector valve Figure 2-30 is located
on port #6 of the hydraulic swivel spool. Output from pump
number 1, section 2 passes through the high speed boost
selector valve. When the valve is de-energized, the oil flows
to the outrigger/rear steer valve. When the valve is
energized, the oil is combined with the output of pump
number 1, section 1 to provide additional oil capacity to the
main crane functions. With the valve in the energized
position, the rear steer and outriggers are inoperative.
The high speed boost selector valve consists of a valve body,
one normally open two-way, two position solenoid valve, and
a pilot to close poppet check valve.
Maintenance
Removal
1. Tag and disconnect the electrical connectors to the
valve.
2. Tag and disconnect the hydraulic hoses from the valve.
Cap or plug the lines and ports.
3. Remove the hydraulic fitting securing the valve to the #6
port of the hydraulic swivel spool. Remove the valve.
Installation
1. Install the valve to the #6 port of the hydraulic swivel
spool and tighten the fitting.
2. Connect the hydraulic hoses to the ports on the valve as
tagged during removal.
3. Connect the electrical connectors to the valve as tagged
during removal.
4. Start the engine and check valve and hoses for leaks.
Make repairs as needed.
Valve Hydraulic Schematic
FIGURE 2-30
1
2
3
1
2
3
Item Description
1 Port P1 - From Pump #1 Section 1
2 Port B - To Integrated Outrigger/Rear Steer Valve
Item Description
3 Port P2 - To Priority Flow Control Valve
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