BOMBARDIER Johnson 90 Service Manual page 253

POWER TRIM AND TILT-90/115
MODES OF OPERATION
Thermal Valve
As temperature goes up, oil pressure will increase and the oil in PTT unit will expand. High oil pressure
in the upper cylinder chamber causad by rising of outside temperatura will release thermal valve and
make the oil flow to reservoir to prevent damage to the PTT unit.
I1I1 11 Tilt cylinder upper chamber
Thermal valva
Checkvalve
8-9