HYDRAULIC SYSTEM RT765E-2 SERVICE MANUAL
2-56
Published 9-04-2014, Control # 422-08
SERVICE BRAKE AND CAC FAN MOTOR
PRIORITY FLOW CONTROL VALVE
Description
The priority flow control valve is located inside the left frame
rail at the center of the frame. The purpose of the valve is to
ensure the brake circuit gets the priority flow and the charge
air cooler fan motor circuit receives the excess flow.
Hydraulic pump number 3 supplies the priority flow control
valve which provides 4.0 gpm (15.1 l/min) to port 8 on the
swivel for the dual accumulator charge valve, then the
charge air cooler fan motor.
Maintenance
NOTE: Maintenance procedures are limited to the removal
and replacement of the valve.
Removal
1. Tag and disconnect the hydraulic lines attached to the
valve. Cap or plug the lines and ports.
2. Remove the capscrews, washers, flatwashers and nuts
securing the valve to the valve mounting plate and
remove the valve.
Installation
1. Place the priority flow control valve on the mounting
plate and secure it with the capscrews, washers,
flatwashers and nuts. Torque capscrews; refer to
Fasteners and Torque Values, page 1-16 for proper
torque value.
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Start the crane and apply the service brake several
times. Verify the service brake works properly.
4. Check for leaks. Make repairs as needed.
Reference Only
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