STIC Steering Machine
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| Illustration 1 | g01055625 |
Schematic for the steering and bucket control valve (1) Steering and bucket control valve (2) Pilot oil supply line (3) Shuttle valve for left turn (4) Steering neutralizer valve (5) Steering control valve (6) Shuttle valve for right turn (7) Steering neutralizer valve (8) Solenoid control valve for a left turn (9) Pilot oil line (10) Pilot oil line (11) Solenoid control valve for right turn (12) Pilot oil line (13) Pilot oil line (14) Pilot oil line (15) Pilot oil line (16) Solenoid control valve for tilt back (17) Shuttle valve for tilt back (18) Solenoid control valve for dump (19) Shuttle valve for dump (20) Solenoid control valve for raise (21) Shuttle valve for raise (22) Solenoid control valve for lower (23) Main control valve (24) Pilot oil return line (25) Shuttle valve for lower | |
The remote control operation of the machine steering and bucket functions is controlled by steering and bucket control valve (1) .
Steering and bucket control valve (1) contains six solenoid control valves (8), (11), (16), (18), (20) and (22). Solenoid control valves (8) and (11) control the machine steering functions. Solenoid control valves (16), (18), (20) and (22) control the machine bucket functions.
The six solenoid control valves share a common supply from pilot oil supply line (2) .
Shuttle valves (3), (6), (17), (19), (21) and (25), are also located in steering and bucket control valve (1).
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| Illustration 2 | g01097181 |
Steering and bucket control valve (1) Steering and bucket control valve (2) Pilot oil supply line (3) Shuttle valve for left turn (6) Shuttle valve for right turn (8) Solenoid control valve for a left turn (11) Solenoid control valve for right turn (16) Solenoid control valve for tilt back (17) Shuttle valve for tilt back (18) Solenoid control valve for dump (19) Shuttle valve for dump (20) Solenoid control valve for raise (21) Shuttle valve for raise (22) Solenoid control valve for lower (24) Pilot oil return line (25) Shuttle valve for lower | |
Manual Operation
Pilot oil lines (12), (13), (14) and (15) from the pilot control valve are connected to steering and bucket control valve (1).
When the joystick control lever on the pilot control valve is moved to the RAISE position, pilot pressure oil is directed to steering and bucket control valve (1). Shuttle valve (21) directs the pilot pressure oil to main control valve (23) in the front frame.
The operation of the lower, tilt back and dump functions are the same as the raise function.
Pilot oil line (9) and pilot oil line (10) from the STIC steering pilot valve are connected to steering and bucket control valve (1) .
When the STIC steering pilot valve is moved to the LEFT TURN position, pilot pressure oil is directed to steering and bucket control valve (1) through pilot oil line (9). Shuttle valve (3), directs the pilot pressure oil through steering neutralizer valve (4) to steering control valve (5). The spool in steering control valve (5) moves and the machine turns to the left.
The operation for a right turn is the same as a left turn.
Remote Control Operation
When the bucket control lever on the transmitter is moved to the RAISE position, the receiver sends a Pulse Width Modulated (PWM) electrical signal via the interface control module to energize solenoid control valve (20). Solenoid control valve (20) directs pilot pressure oil from pilot oil supply line (2) to shuttle valve (21) in steering and bucket control valve (1) .
Shuttle valve (21) directs pilot pressure oil to main control valve (23). The pilot pressure oil moves the lift control valve spool in main control valve (21) to the RAISE position.
When the bucket control lever on the transmitter is released, it will return to the HOLD position. Solenoid control valve (20) will de-energize, allowing pilot oil from main control valve (23) to return through shuttle valve (21) and pilot oil return line (24) to the hydraulic tank. The lift control valve spool in main control valve (23) is moved to the HOLD position by spring force and the bucket remains stationary.
The operation of the lower, tilt back, and dump functions are the same as the raise function.
When the motion control lever on the transmitter is moved to the LEFT TURN position, the receiver sends a PWM electrical signal via the interface control module to energize solenoid control valve (8). Solenoid control valve (8) directs pilot pressure oil from pilot oil supply line (2) to shuttle valve (3). Shuttle valve (3) directs pilot pressure oil through steering neutralizer valve (4) to steering control valve (5). The spool in steering control valve (5) moves and the machine turns to the left.
When the motion control lever on the transmitter is released, it will return to the HOLD position. Solenoid control valve (8) will de-energize, allowing pilot oil to return through shuttle valve (3) and the pilot oil return line (24) to the hydraulic tank. The spool in steering control valve (5) is moved to the HOLD position by spring force and the machine stops articulating.
The operation for a right turn is the same as a left turn.
ReferenceFor more information on the operation of the hydraulic system, refer to System Operation, Testing and Adjusting, Hydraulic System for the machine that is being serviced.
ReferenceFor more information on the operation of the steering system, refer to Systems Operation, Testing and Adjusting, Steering System for the machine that is being serviced.