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Mercury 90 Service Manual

Mercury 90
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5C-0 - MID-SECTION 90-830234R3 DECEMBER 1997
Table of Contents
Page
Special Tools 5C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Trim Components (Yellow Fill Plug)
(S/N-USA-0G360003/BEL.-9934137 & UP) 5C-2. . . . . .
Notes: 5C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 5C-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Trim Flow Diagrams – Trim Up Circuit 5C-6. . . .
Tilt Circuit 5C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Tilt 5C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Down Circuit 5C-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shock Function Up 5C-14. . . . . . . . . . . . . . . . . . . . . . . . . .
Shock Function Return 5C-16. . . . . . . . . . . . . . . . . . . . . . .
Manual Release 5C-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 5C-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trimming Characteristics 5C-20. . . . . . . . . . . . . . . . . .
Trailering Outboard 5C-21. . . . . . . . . . . . . . . . . . . . . . .
Tilting Outboard Up and Down Manually 5C-21. . . . .
Troubleshooting 5C-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preliminary Checks 5C-22. . . . . . . . . . . . . . . . . . . . . . .
Hydraulic System Troubleshooting
Flow Chart 5C-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting the Power Trim Electrical
System 5C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page
Power Trim System Removal 5C-29. . . . . . . . . . . . . . . . .
Power Trim Disassembly 5C-30. . . . . . . . . . . . . . . . . . . . .
Trim Motor Removal 5C-31. . . . . . . . . . . . . . . . . . . . . .
Pump and Components Removal 5C-31. . . . . . . . . . .
Manifold Removal 5C-32. . . . . . . . . . . . . . . . . . . . . . . .
Shock Rod Removal 5C-32. . . . . . . . . . . . . . . . . . . . . .
Shock Rod Disassembly 5C-33. . . . . . . . . . . . . . . . . . . . .
Memory Piston Removal 5C-35. . . . . . . . . . . . . . . . . .
Cleaning/Inspection/Repair 5C-36. . . . . . . . . . . . . . . . . . .
Trim Motor Electrical Tests 5C-36. . . . . . . . . . . . . . . . .
Reassembly 5C-37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O-Ring and Seal Placement 5C-37. . . . . . . . . . . . . . .
O-Ring Sizes 5C-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O-Ring Description and Sizes 5C-39. . . . . . . . . . . . . . . . .
Power Trim Reassembly 5C-40. . . . . . . . . . . . . . . . . . . . .
Shock Rod Reassembly 5C-40. . . . . . . . . . . . . . . . . . .
Shock Rod Installation 5C-41. . . . . . . . . . . . . . . . . . . .
Trim Limit Assembly Installation 5C-42. . . . . . . . . . . .
Manual Release Valve Installation 5C-42. . . . . . . . . .
Manifold Installation 5C-42. . . . . . . . . . . . . . . . . . . . . .
Oil Pump Installation 5C-43. . . . . . . . . . . . . . . . . . . . . .
Pressure Operated Assembly Installation 5C-44. . . .
Reservoir/Motor Installation 5C-44. . . . . . . . . . . . . . . .
Bleeding Power Trim Unit 5C-45. . . . . . . . . . . . . . . . .
Installation of Power Trim System 5C-45. . . . . . . . . . . . .

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Mercury 90 Specifications

General IconGeneral
BrandMercury
Model90
CategoryOutboard Motor
LanguageEnglish

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