Yamaha F150B - PTT Unit; Trim-Up and Tilt-Up Function

2-29
TECH
FEA
Technical features and description
PTT unit
Trim-up and tilt-up function
When the PTT switch is pressed to “UP,” the PTT motor operates the gear pump and fluid pressure
is generated. As a result, the fluid pressure pushes the up-shuttle piston, enters the trim cylinder
and tilt cylinder lower chambers through the up-main valve, and then pushes the trim ram and tilt
ram upward.
In addition, the fluid pushes the down-shuttle piston, opens the down-main valve, and returns from
the tilt cylinder upper chamber to the gear pump.
After the trim ram has extended completely, the tilt ram operates to tilt up.
A
Return
B Send
a Reservoir
b Tr im ra m
c Tilt ram
d Up-shuttle piston
e Up-main valve
f Trim cylinder
g Tilt cylinder
h Down-main valve
i Down-shuttle piston
j Up-relief valve
k Gear pump
l PTT motor
a
k
l
k
i
h
j
f
f
b
b
c
g
d
e
A
B