Yamaha F50D Servise Manual page 53

Tilt-up function
When the trim cylinder 5 tops out, the check valve 4 is pushed down by the end screw wall 3.
This causes allowing the PTT fluid to flow from the upper part of the trim cylinder 5, through the
down-shuttle piston q and the down-main valve 7, and back to the gear pump 8. And the pressur-
ized fluid continues to flow into the lower part of the trim cylinder 5, pushing up the tilt piston r and
free piston e, and further extending the PTT ram 2.
r
e
:
:
:
1 PTT cylinder
2 PTT ram
3 End screw
4 Check valve
5 Trim cylinder
6 Reservoir
7 Down-main valve
8 Gear pump
9 Up-main valve
0 Up-shuttle piston
2
3 4
1
5
6 7
q
w
8
9 6
6 0
q Down-shuttle piston
w Trim cylinder base
e Free piston
r Tilt piston
a Return
b Send
c Moving direction
PTT unit
0
1
2
3
4
5
6
7
8
9
10
A
2-14