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| Illustration 1 | g01052268 |
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Location of the Travel Control Valve The rear of the machine | |
The travel control valve is mounted on the hydraulic tank at the rear of the machine.
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| Illustration 2 | g02583837 |
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Travel Control Valve (1) Inlet section (2) Pressure differential relief valve (3) Left travel control valve (4) Right travel control valve (5) End section (6) Main relief valve (7) Proportional solenoid valve (reverse left) (8) Proportional solenoid valve (forward left) (9) Proportional solenoid valve (reverse right) (10) Proportional solenoid valve (forward right) (P1) Pump port (T1) Tank port (A) Forward port (left travel control valve) (A) Forward port (right travel control valve) (B) Reverse port (left travel control valve) (B) Reverse port (right travel control valve) | |
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| Illustration 3 | g01474093 |
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Hydraulic Schematic of the Travel Control Valve (1) Inlet section (2) Pressure differential relief valve (3) Left travel control valve (4) Right travel control valve (6) End section (7) Main relief valve (8) Proportional solenoid valve (reverse left) (9) Proportional solenoid valve (forward left) (10) Proportional solenoid valve (reverse right) (11) Proportional solenoid valve (forward right) (12) Orifice (13) Orifice (14) Signal duplication valve (15) Back pressure valve (16) Pressure compensator valve (left) (17) Valve spool (18) Pressure compensator valve (right) (19) Valve spool | |
When the travel pedals are not activated, pressure differential relief valve (2) increases the pressure oil from the main pumps at port (P1) to
The pumps of the Track Feller Bunchers are now split. One is for the implement circuit and another one is for the travel circuit. The pressure setting for the main relief valve is set at
When the travel pedals are in the NEUTRAL position, the valve spools are in the CENTER position. Pressure compensator valve (16) and (18) contains a load hold check valve.
Check valves in control valves (3) and (4) prevent cavitation in the travel circuit.
The signal pressure oil drains from pressure compensator valve (16) and (18). Pressure differential relief valve (2) sets the signal pressure.
When the operator presses both travel pedals forward, a signal is sent from each travel pedal to the IQAN controller. The IQAN controller sends current to proportional solenoid (9) and (11). The pilot oil flows through proportional solenoid (9) and (11) through orifices and to the valve spool (17) and (19). The orifices prevent valve spools (17) and (19) from moving rapidly. The valve spools move upward.
The pressure oil from the main pumps flows through pressure compensator valves (16) and (18). The oil flows to the left travel motor and the right travel motor. The machine moves in the FORWARD direction. Regardless of the pressure of the main pumps, the pressure compensator valves maintain constant oil flow to the travel motors.
Pressure oil also flows into the resolver network for the signal pressure. The resolver network sends the highest work port pressure to signal duplication valve (14).
The load sensing signal pressure upstrokes the main pumps.
When the operator presses both travel pedals in reverse, a signal is sent from each travel pedal to the IQAN controller. The IQAN controller sends current to proportional solenoid (8) and (10). The pilot oil flows through proportional solenoid (8) and (10) through orifices and to the valve spool (17) and (19). The orifices prevent valve spools (17) and (19) from moving rapidly. The valve spools move downward.
The pressure oil from the main pumps flows through pressure compensator valves (16) and (18). The oil flows to the left travel motor and the right travel motor. The machine moves in the REVERSE direction. Regardless of the pressure of the main pumps, the pressure compensator valves maintain constant oil flow to the travel motors.
Pressure oil also flows into the resolver network for the load sensing signal pressure. The resolver network sends the highest work port pressure to signal duplication valve (14).
The load sensing signal pressure upstrokes the main pumps.