TUBE 5337284 - Caterpillar

Introduction
The boom cylinder decompression system is designed to increase the stability of the excavator during a BOOM RAISE operation. This is achieved by decreasing the speed of the boom as the boom cylinders near full extension.
Illustration 1 g01892033
Cab platform (bottom view) (1) Proportional reducing valve (boom cylinder decompression) (2) Pressure tap for solenoid valve (3) Pilot line (4) Pilot line (5) Drain lineThis system utilizes proportional reducing valve (1) to control pilot pressure to the boom control valves. In the system, proportional reducing valve (1) is located between the joystick and the boom control valves. This valve is mounted on the cab platform.
Illustration 2 g01891773
Boom angle sensor (6) Boom foot (7) Potentiometer (8) LeverThe boom angle sensor within the boom cylinder decompression system communicates the angle of the boom