LENS- 1U8209 - Caterpillar

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Location of Trailer Control Valve
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Trailer Control Valve
(1) Pressure relief valve
(2) Trailer Tailgate Solenoid
(3) Trailer Platform SolenoidThe trailer control valve is mounted on the undercarriage gear box. The dozer/stabilizer control valve directs the flow of oil to two trailer package cylinders. One cylinder controls opening and closing the trailer tailgate. The second cylinder is telescopic and controls the ability to lift or lower the trailer.Trailer System Controls
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Right-Hand Console
(4) Trailer control switch
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Trailer Control Switch
(5) Unlock trailer tailgate
(6) Trailer control OFF
(7) Unlock trailer dump
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Left-Hand Console
(8) Trailer control joystickA dedicated 3-position rocker switch for trailer control (4) is on the right-hand console. If either trailer tailgate unlock (5) or trailer dump unlock (7) functions are selected, all stabilizer and dozer solenoids are automatically locked. Depending on the position of the rocker switch, only the trailer dump solenoid or the trailer tailgate solenoid is unlocked. Trailer dump (raise or lower) or trailer tailgate (open or close) can be controlled by trailer control joystick (8) on the left-hand console.Trailer Tailgate (OPEN)
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(9) Trailer tailgate cylinder
(10) Trailer dump cylinder
(11) Interface to excavator hydraulic system
(12) Port (tailgate open)
(13) Port (tailgate close)
(14) Port (trailer raise/lower)
(15) Unloading valve
(16) Check valve
(17) Line relief valve
(18) Tailgate activation solenoid
(19) Trailer dump activation solenoidTo activate the trailer tailgate LIFT function, the operator uses rocker switch (4) on the right-hand console. Selecting trailer tailgate UNLOCK (5) activates trailer tailgate solenoid (18). Trailer tailgate solenoid (18) shifts allowing hydraulic oil to flow to trailer tailgate cylinder (9). The Operator then moves the trailer joystick (8) on the left-hand console to move the tailgate for either OPEN or CLOSE.If tailgate OPEN is selected, oil flow is directed to the head end of cylinder (9). If tailgate CLOSE is selected, oil flow is directed to the rod end of cylinder (9).Trailer Bed (RAISE)
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(9) Trailer tailgate cylinder
(10) Trailer dump cylinder
(11) Interface to excavator hydraulic system
(12) Port (tailgate open)
(13) Port (tailgate close)
(14) Port (trailer raise/lower)
(15) Unloading valve
(16) Check valve
(17) Line relief valve
(18) Tailgate activation solenoid
(19) Trailer dump activation solenoidTo activate the trailer dump bed RAISE function, the operator uses rocker switch (4) on the right-hand console. Selecting trailer dump UNLOCK (7) activates trailer dump solenoid (19). Trailer dump solenoid (19) shifts allowing hydraulic oil to flow to trailer dump cylinder (10). The Operator then moves the trailer joystick (8) on the left-hand console to move the trailer dump for either RAISE or LOWER.If trailer dump RAISE is selected, oil flow is directed to the telescopic trailer dump cylinder (10). If trailer dump LOWER is selected, oil flow is directed away from the telescopic trailer dump cylinder (10).