Yamaha F50D Servise Manual - page 54

Technical features and description

2-15

TECH

FEA

Tilt-down function

The gear pump 

6

 pumps the PTT fluid to the down-main valve 

5

. As a result, fluid pressure opens

the down-main valve 

5

 and the down-shuttle piston 

q

, which causes fluid to flow into the upper

part of the trim cylinder 

3

 and forces the tilt piston 

t

 down.

1

PTT cylinder

2

PTT ram

3

Trim cylinder

4

Down-relief valve

5

Down-main valve

6

Gear pump

7

Reservoir

8

Up-relief valve

9

Up-shuttle piston

0

Up-main valve

q

Down-shuttle piston

w

Ball

e

Trim cylinder base

r

Free piston

t

Tilt piston

a

Return

b

Send

c

Moving direction

:

:

:

1

2

3

4

5

6

7

8

9

0

q

w

e

w

r

t