DF140 “K2” (’02) MODEL 11-41
TILT DOWN / TRIM IN
(1) When the PTT switch is operated in the “DOWN” position, the motor and gear pump will rotate in a
counterclockwise direction.
(2) The oil pressure will open the “Down” check valve D and oil will be forced through the “Down” shuttle valve
E. When the oil reaches “Up” shuttle valve B, the “Up check valve A will begin to open mechanically.
(3) The pressurized oil flows through “Down” check valve D and then enters the upper area of the tilt cylinder.
This thereby forces the tilt rod piston downward.
(4) When the swivel bracket contacts the trim rams, this pressure forces the trim pistons downward and oil
from the reservoir is then able to enter the area above both trim rod pistons.
(5) Oil from the lower area of the trim and tilt cylinders now returns to the pump through “Up” check valve A.
(6) Throughout the tilt action operation range, there is a difference in oil volume between the upper and lower
chambers of the tilt cylinder, and any surplus oil is therefore directed to the reservoir by means of the
“Down” relief orifice H.
(7) Throughout trim operation range, oil will be discharged from the bottom of all three cylinders and the
pump will only supply oil to the tilt cylinder. Excess oil is then vented to the reservoir through the “Down”
relief orifice H.
(8) To prevent damage from excessive oil pressure when all three rods are fully retraced, this pressure is
relieved through the “Down” relief orifice H.
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