Suzuki DF 90 - Page 254

8-24 POWER TRIM AND TILT
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 caused by rising of outside temperature will release thermal
valve and make the oil flow to reservoir to prevent from damaging of PTT unit.
Tilt cylinder upper chamber
Shock valve
Free piston
Lower cylinder chamber
Check valve
Thermal valve