332
TRIM AND TILT
MODES OF OPERATION
MODES OF OPERATION
The trim/tilt hydraulic assembly achieves trim and
tilt movement through the following modes of
operation.
Trim-OUT / Tilt-UP Mode
When the UP switch is pressed, the trim/tilt motor
rotates clockwise (as viewed from pump end) and
turns the pump gears.
Fluid pressure pushes the UP check valve off its
seat, and fluid passes through the valve to the
bottom of all cylinders, pushing the pistons UP.
Fluid is pushed from the top of the tilt cylinder by
the piston and returns to the pump through the
open DOWN check valve.
In the trim range, fluid is pushed from the top of
the trim cylinders by the pistons and returns to the
reservoir.
Only fluid from the top of the tilt cylinder is
returned to the pump. Because the cylinder rod
displaces some fluid, that volume is less than the
volume of the bottom of the tilt cylinder. So, addi-
tional fluid is drawn into the pump from the reser-
voir.
When all the cylinders are completely extended,
the pressure increases until the UP relief valve
opens at the tilt-up stall pressure (approximately
1500 psi (10342 kPa)).
1.
Up shuttle valve
2.
Down shuttle valve
3.
Down check valve
4.
Up check valve
5.
Tilt cylinder
6.
Trim cylinders
7.
Up relief valve
DRC3462
2
3
1
7
4
5
6
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