Mooes Of Operation - BOMBARDIER Johnson 90 Service Manual

POWER TRIM
ANO
TILT-90/115
MODES OF OPERATION
MODES OF OPERATION
Trlm/ Tilt "UP" Circuit
When the PTT switch is operated "UP" position, the electric motor and gear pump@ will operation on
clockwise direction. Pressurized oil will open check valve
®,
oil will flow from reservoir to spool valve
®
via pump and spool valve @. The spool valve
®
will down, then "DOWN" pressure main check valve
CD
will open.
Oil in the upper chamber will return to pump via 2-way valve, and then oil pressure will rise and open
"UP" pressure main check valve
®,
then oil will flow to lower cylinder chamber of cylinder. lt makes the
piston rod push up and the engine tilt up. To keep oil level, oil flows from reservoir to pump through the
check valve
®·
Oil through the "DOWN" pressure main check valve 1 and returns to pump.
When trim motor stops, both the "DOWN" pressure main check valve
CD
and the "UP" pressure main
check valve
®
will close to retain tilt / trim position. In the trim area, trim pisten and floating tube are
moving with pisten rod. When full trim / tilt "UP" position is attained, sustained operation of the "UP" relay
will have no effect, as pump oil flow will be returned to the reservoir through the "UP" relief valve @.
Check valve B
Spool valve A
----- Tllt rod
Oil reservoir
11I1
¡
1 Tllt cylinder upper chamber
1I1 11 Floating tube
CD
Endcase
.;--1----
Trim cylinder upper chamber
'
. . ••.........
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"DOWN" pressure main check valve
®
"UP"
pressure main check valve
@
"UP"
relief valve
@"Gearpump
Lower cylinder chamber
8-5