77334 Mercury Co-Pilot Disc | Genuine Used Part

🔧 Product Description

Genuine Mercury Outboard Co-Pilot Steering Friction Disc - Part Number: 77334

A genuine Mercury friction disc used in the co-pilot steering-tension mechanism of selected 7.5HP, 9.8HP and 75-series portable outboards.

Part number 77334 is documented as a Mercury outboard co-pilot disc fitted within the saddle and swivel-bracket assembly.

⚙️ Key Features

• Genuine Mercury outboard steering component
• Correct part number 77334
• Co-pilot steering-friction disc
• Fits the saddle and swivel-bracket tension mechanism
• Provides adjustable steering resistance
• Used on selected portable twin-cylinder engines

🚤 Compatibility

Documented on selected

• Mercury 7.5HP outboards
• Mercury 9.8HP outboards
• Mercury model 75 portable outboards
• Mercury 75 Australia serial 8015315-8051349
• Mercury 75 USA serial 3801458-4691221 and 4691222 and above
• Mercury 75 Belgium serial 9043194-9150904 and 9150905 and above
• Mercury 75 Canada serial 7028598-7095422 and 7095423 and above
• Mercury 9.8HP serial 8057545 and above
• Engine Type: Mercury portable carburetted two-stroke outboard
• Fitment Requirement: Confirm saddle-bracket and co-pilot adjustment design

🔌 Function

The disc provides controlled friction between the co-pilot adjustment components. Tightening the steering-tension control compresses the disc and increases resistance to unwanted engine movement.

⚠️ Common Signs of Failure

• Steering is too loose even when adjusted
• Steering binds or becomes jerky
• Disc is glazed, cracked or oil-contaminated
• Adjustment screw reaches its limit without sufficient friction
• Uneven wear causes inconsistent steering resistance

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 77334 original documented co-pilot disc reference
• No direct supersession confirmed

OEM / Related Numbers

• 77334
• 10-30679 related adjustment screw
• 11-24652 related nut
• 20203 related friction disc
• Related saddle, swivel bracket and co-pilot lever components

Aftermarket / Verified Equivalents

• Specialist used or new-old-stock Mercury 77334 disc
• Professionally cut marine friction disc only when thickness, diameter and friction material match
• No verified direct aftermarket packaged equivalent

📦 Condition

• Genuine used part
• Removed from operating outboard where applicable
• In good working condition unless otherwise stated
• Inspect the associated friction surfaces before installation