Mercury 30 Service Manual

5B-0 - MID-SECTION 90-826148R2 MARCH 1997
Table of Contents
Page Page
Special Tools 5B-1. . . . . . . . . . . . . . . . . . . . . . . . . .
Power Trim Components 5B-2. . . . . . . . . . . . . . . .
Power Trim Mounting 5B-4. . . . . . . . . . . . . . . . . . .
Theory Of Operation 5B-6. . . . . . . . . . . . . . . . . . . .
Adjustments 5B-6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Trimming Characteristics 5B-6. . . . . . . . . . . . .
Trimming Outboard “Up” (“Out”) 5B-6. . . . .
Trimming Outboard “Down” (“In”) 5B-6. . . .
Trailering Outboard 5B-7. . . . . . . . . . . . . . . . . .
Tilting Outboard Up and Down
Manually 5B-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Trim “In” Angle Adjustment 5B-7. . . . . . . . . . . .
Power Trim Flow Diagrams 5B-8. . . . . . . . . . .
Trim Up 5B-9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5B-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tilt Up 5B-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5B-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Tilt 5B-13. . . . . . . . . . . . . . . . . . . . . . . .
5B-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Down Mode 5B-15. . . . . . . . . . . . . . . . . . . . . . . . .
5B-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shock Function Up 5B-17. . . . . . . . . . . . . . . . . .
5B-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shock Function Return 5B-19. . . . . . . . . . . . . . .
5B-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Tilt 5B-21. . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 5B-22. . . . . . . . . . . . . . . . . . . . . . . .
Preliminary Checks 5B-22. . . . . . . . . . . . . . . . . .
Hydraulic System Troubleshooting
Flow Chart 5B-23. . . . . . . . . . . . . . . . . . . . . . . . . .
Outboard Will Not Hold Tilted Position
During Reverse And/Or Trails Out
During High Speed Deceleration 5B-23. . . .
Hydraulic System Troubleshooting
Flow Chart 5B-24. . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic System Troubleshooting
Flow Chart 5B-25. . . . . . . . . . . . . . . . . . . . . . . . . .
Trim system leaks down with manual
release valve closed 5B-25. . . . . . . . . . . . . . .
Hydraulic System Troubleshooting
Flow Chart 5B-26. . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting the Power Trim
Electrical System 5B-27. . . . . . . . . . . . . . . . . . . .
Troubleshooting the Power Trim
Electrical System 5B-28. . . . . . . . . . . . . . . . . . . .
Power Trim System Removal 5B-29. . . . . . . . . . . .
Disassembly 5B-30. . . . . . . . . . . . . . . . . . . . . . . . . . .
Shock Rod Removal 5B-30. . . . . . . . . . . . . . . . .
Shock Rod Disassembly 5B-31. . . . . . . . . . . . . . . .
Memory Piston Removal 5B-33. . . . . . . . . . . . . .
Trim Motor Removal 5B-34. . . . . . . . . . . . . . . . .
Oil Pump Removal 5B-35. . . . . . . . . . . . . . . . . . .
Tilt Relief Valve Removal 5B-35. . . . . . . . . . . . .
Suction Seat Removal 5B-36. . . . . . . . . . . . . . . .
Pilot Check Valve Assembly Removal 5B-36. .
Cleaning/Inspection/Repair 5B-37. . . . . . . . . . . . . .
Trim Motor Electrical Tests 5B-37. . . . . . . . . . . .
Reassembly 5B-38. . . . . . . . . . . . . . . . . . . . . . . . . . .
O-Ring and Seal Placement 5B-38. . . . . . . . . . .
O-Ring and Seal Placement 5B-39. . . . . . . . . . .
Power Trim Reassembly 5B-40. . . . . . . . . . . . . . . .
Tilt Relief Valve Reassembly 5B-40. . . . . . . . . .
Suction Seat Reassembly 5B-40. . . . . . . . . . . .
Pilot Check Valve Reassembly 5B-41. . . . . . . .
Oil Pump Reassembly 5B-41. . . . . . . . . . . . . . . .
Trim Motor Reassembly 5B-42. . . . . . . . . . . . . .
Shock Rod Reassembly 5B-42. . . . . . . . . . . . . .
Shock Rod Installation 5B-44. . . . . . . . . . . . . . .
Manual Release Valve Installation 5B-44. . . . .
Bleeding Power Trim Unit 5B-44. . . . . . . . . . . . .
Power Trim System Installation 5B-45. . . . . . . . . .

Mercury 30 Specifications

General

Horsepower	30 HP
Cylinders	3
Displacement	526 cc
Gear Shift	F-N-R
Fuel Induction System	Electronic Fuel Injection (EFI)
Shaft Length	20 in
Steering	Remote / Tiller