TOHATSU 40 Service Manual page 328

POWER TRIM/TILT
Service Check 6 - Lower Chamber Side Check Valve
1. Remove and clean lower chamber side check valve.
2. Inspect for thread and surface damage.
3. Inspect for damage or deterioration of o-rings.
Service Check 7 - Upper Chamber Side Check Valve
1. Remove and clean upper chamber side check valve.
2. Inspect for thread and surface damage.
3. Inspect for damage or deterioration of o-rings.
Service Check 8 - Spool
1. Remove upper chamber side valve seat.
2. Remove and clean spool components.
3. Inspect for the following:
• Smooth operation; push manually and check its return.
• Fatigue or deformation of springs.
• Damage or deterioration of back-up ring.
Service Check 9 - Oil Pump
Replace the oil pump and retest PT/T operation.
Service Check 10 - Trim Cylinder Piston
1. Remove rod guide.
2. Remove and clean trim piston components.
3. Inspect for the following:
• Damage to piston sliding surface in cylinder.
• Damage or deformation of piston rod and rod guide.
• Damage or deterioration of o-rings and back-up ring.
8-29
3-/ 4-Cylinder