BRAKE G RH 0690557 - Caterpillar

STIC Steering Machine
Illustration 1 g06027896
Schematic for the steering and bucket control valve
(1) Pilot oil line
(2) Pilot oil line
(3) Pilot oil supply line
(4) Steering and bucket control valve
(5) Steering neutralizer valve
(6) Solenoid
(7) Steering control valve
(8) Check valve for left turn
(9) Directional control valve
(10) Check valve for right turn
(11) Steering neutralizer valve
(12) Solenoid
(13) Pilot oil line
(14) Pilot oil line
(15) Pilot oil line
(16) Pilot oil line
(17) Solenoid control valve for tilt back
(18) Shuttle valve for tilt back
(19) Solenoid control valve for dump
(20) Shuttle valve for dump
(21) Main control valve
(22) Solenoid control valve for raise
(23) Shuttle valve for raise
(24) Solenoid control valve for lower
(25) Shuttle valve for lower
(26) Pilot oil return lineThe remote control operation of the machine steering and bucket functions is controlled by steering and bucket control valve (4).Steering and bucket control valve (4) contains four solenoid control valves (17), (19), (22) and (24) and directional control valve (9). Directional control valve (9) controls the machine steering functions. Solenoid control valves (17), (19), (22) and (24) control the machine bucket functions.Solenoid control valves (17), (19), (22) and (24) and directional control valve (9) share a common supply from pilot oil supply line (3).Shuttle valves (18), (20), (23) and (25) are also located in steering and bucket control valve (4). Check valves (8) and (10) are located between directional control valve (9) and steering and bucket control valve (4).
Illustration 2 g06027897
Steering and bucket control valve
(1) Pilot oil line
(2) Pilot oil line
(3) Pilot oil supply line
(4) Steering and bucket control valve
(6) Solenoid
(8) Check valve for left turn
(9) Directional control valve
(10) Check valve for right turn
(12) Solenoid
(13) Pilot oil line
(14) Pilot oil line
(15) Pilot oil line
(16) Pilot oil line
(17) Solenoid control valve for tilt back
(18) Shuttle valve for tilt back
(19) Solenoid control valve for dump
(20) Shuttle valve for dump
(22) Solenoid control valve for raise
(23) Shuttle valve for raise
(24) Solenoid control valve for lower
(25) Shuttle valve for lower
(26) Pilot oil return lineManual Operation
Pilot oil lines (13), (14), (15) and (16) from the pilot control valve are connected to steering and bucket control valve (4).When joystick control lever on pilot control valve is moved to the RAISE position, pilot pressure oil is directed to steering and bucket control valve (4). Shuttle valve (23) directs pilot pressure oil to main control valve (21) in the front frame.The operation of the lower, tilt back and dump functions are the same as the raise function.Pilot oil line (1) and pilot oil line (2) from the STIC steering pilot valve are connected to steering and bucket control valve (4).When the STIC steering pilot valve is moved to the LEFT TURN position, pilot pressure oil is directed to steering and bucket control valve (4) and steering neutralizer valve (5). Pilot pressure oil is blocked by check valve (8). Pilot pressure oil is then directed through steering neutralizer valve (5) to steering control valve (7). The spool in steering control valve (7) moves and the machine turns to the left.The operation for a right turn is the same as a left turn.Remote Control