BOOM GP-NOSE 1695056 - Caterpillar

Illustration 1 g01134080
Schematic for the hydraulic system
(1) Main control valve
(2) Line relief valve for rod end of tilt cylinder
(3) Line relief valve for head end of tilt cylinder
(4) Pressure tap for rod end of tilt cylinder
(5) Tilt cylinder
(6) Lift cylinders
(7) Ride control accumulator
(8) Ride control diverter valve
(9) Pressure tap for head end of tilt cylinder
(10) Lift circuit relief valve
(11) Ride control relief valve
(12) Implement and steering solenoid valve
(13) Ride control solenoid valve
(14) Main relief valve
(15) Parking brake solenoid valve
(16) Parking brake oil pressure switch
(17) Pressure tap for the parking brake circuit
(18) Lift arm positioner valve
(19) Float sequence valve
(20) Check valve
(21) Selector and pressure control valve
(22) Line to parking brakes
(23) Line from steering circuit
(24) Pilot control valve
(25) Brake accumulator charging valve
(26) Breaker relief valve
(27) Check valve
(28) Portable hydraulic pump quick connect coupler
(29) Line to brake accumulator
(30) Pilot and braking pump
(31) Steering pump
(32) Implement pump
(33) Hydraulic filters
(34) Hydraulic tank
(35) Pilot relief valve
(36) Pilot system pressure tap
(37) Pilot oil filter
(38) Check valve
(39) Portable hydraulic pump quick connect coupler The ride control system provides a means for dampening the bucket forces which produce a pitching motion as the machine travels over rough terrain.The main components of the ride control system are ride control accumulator (7), ride control diverter valve (8), ride control solenoid valve (13) and lift cylinders (6).
Illustration 2 g01138933
(7) Ride control accumulator
Illustration 3 g01040086
(8) Ride control diverter valve
(13) Ride control solenoid valve Ride control accumulator (7) is mounted in the left side of the front frame. Ride control diverter valve (8) and ride control solenoid valve (13) are mounted under the cover on the front frame of the machine.
Illustration 4 g01134081
(40) Ride control switch
(41) Ride control indicator Ride control switch (40) is mounted in the switch panel in the operator station. Ride control indicator (41) is located on the indicator panel in the operator station.When the ride control system is activated, the head end of the lift cylinders are connected to ride control accumulator (7). The ride control accumulator provides a cushioning effect to the head end oil, allowing the lift cylinders to extend and retract slightly. The bucket can move as a balance weight against the movement of the machine.Ride control switch (40) has three positions: the OFF position, the AUTO position and the SERVICE position.OFF Position
Ride control solenoid valve (13) is a normally closed valve. When the lift spool in main control valve (1) is in the HOLD position and ride control switch (40) is in the OFF position, the coil in ride control solenoid valve (13) is not energized. A spring in the ride control solenoid valve holds the solenoid valve spool in the closed position. With the solenoid valve spool in the closed position, the ride control system will not operate.When the ride control switch is in the OFF position, the check valve between lift cylinders (6) and ride control accumulator (7) allows a continual sensing of the lift cylinder pressure. When a load is in the bucket, pressure increases in the head end of the lift cylinders. This pressure