Method 2
1.
Extend the power tilt cylinder to the full up position.
2. Mark the tilt cylinder rod 55 mm (2.2 in.) above the cylinder cap with an indelible marker.
3. Wait 24 hours.
4. If the marked line is visible, the power tilt unit is within specifications for leakage.
Power Tilt System Leakage Specification
Cylinder rod leak‑down in 24 hour period Less than 55 mm (2.2 in.)
Hydraulic System Troubleshooting
Condition/Problem
Condition of Tilt System Problem
Tilt motor runs; tilt system does not move up or down 1, 2, 5, 7
Does not tilt full down. Up tilt OK. 1, 3, 4, 6, 7, 11
Does not tilt full up. Down tilt OK. 1, 4, 6, 7, 10
Partial or jerky down/up 1, 3, 6
Leaks down and does not hold tilt 4, 5
Tilt motor working hard and tilts slow up and down 7, 8, 9
Tilts up very slow 1, 2, 6, 7, 8, 9, 10
Starts to tilt up from full down position when the down tilt button is depressed 3, 4
Problem/Solution
No. Problem Solution
1. Low fluid level Add Power Trim and Steering Fluid or ATF (Type Dexron III).
2. Defective hydraulic pump Replace pump assembly.
3. Tilt cylinder piston O‑ring leaking or cut Replace power tilt assembly.
4.
Manual release valve leaking (check condition of
O‑rings) (valve not fully closed)
Ensure that valve is fully closed. Inspect O‑rings.
5. Debris in system Inspect for debris. Refill system with clean fluid.
6. Battery low Check battery.
7. Electric motor defective
Refer to T
ilt Electrical System ‑ General Troubleshooting.
8. Broken motor/pump driveshaft Inspect for damage.
9. Air pocket under pump
Purge system. Refer to Purging the Power T
ilt System, preceding.
10. Defective up relief valve
Inspect components. Refer to Power T
ilt Pump Disassembly.
11. Defective down relief valve
Inspect components. Refer to Power T
ilt Pump Disassembly.
Tilt Electrical System ‑ General Troubleshooting
General Checks
Before troubleshooting the power tilt electrical system, ensure the following:
•
No wires are disconnected
• Connections are tight and corrosion‑free
• Plug‑in connections are fully engaged
• Battery is fully charged
Condition/Problem
Condition of Tilt System Problem No.
Tilt motor does not run when the tilt button is pressed 1, 3, 4, 5, 6, 7
Tilt system tilts opposite of buttons 2
Tiller handle mounted tilt buttons do not activate the tilt system 3, 4, 5, 6
Power Tilt
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 5B-11
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