OILDYNE TRIM PUMP
SERVICE MANUAL NUMBER 28
90-863160 MAY 2000 Page 5A-15
Trim Cylinder Shock Piston Test
If all previous trim system test results meet specifications, but sterndrive unit will not
trim IN/DOWN, the problem may be a leaky trim cylinder shock piston. Use the follow-
ing test to check for this condition. No test gauge required.
1. Run the pump in the OUT/UP direction until the trim cylinders are fully extended.
2. Use a suitable devise to keep trim cylinder piston rods from retracting. The Quicksilver
Trailering Kit works well for this purpose.
22562
a
a-Trailering Clip
3. Disconnect the UP trim hose from trim cylinders.
50389
b
a
a-UP Trim Hose
b-Front Connection
4. Run the pump in the IN/DOWN direction. If oil flows from the UP port on the trim cylinder,
the shock piston is leaking and must be replaced.
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