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Roller Bearing, Forward gear 31-21739

Satisfaction rating 5 out of 5 (6 Ratings)
CROSS SHIP Leaves in 3-5 days
This product will be cross shipped from one of our secondary warehouses. Please note the additional handling time.
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  • This is an OEM part manufactured by Mercury Marine
  • Flat rate shipping starting at $4.95
  • 30 day return policy

Product Description

Mercury factory part. Search for more factory parts & parts diagrams.

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6 Product Reviews


Repair Difficulty
Repair Time
30 to 60 mins
You guys are awesome! Can’t fault you on parts and service, however, delivery is a little painful. Having said that, I live in Australia so it’s probably to be expected. Well done guys, happy customer right here!! Cheers

Problem fixed: Lower unit rebuild

It was a bigger getting it apart, but the install was painless.



1989 25 hp mercury

Repair Difficulty
Repair Time
More than 4 hours
Replaced seals and bearings in 25hp merc. Ordered parts and shipped to my door (Goulburn NSW) in about 8 days. Thank you!

Problem fixed: Water in lower unit

Dismantled gearbox. Made up a puller to remove driveshaft needle bearings. Took some doing removing bearings off reverse gear. Press all parts together with vice and reassemble. Moved at a slow pace and all seems ok

mercury 25 hp

Repair Difficulty
Repair Time
1 to 2 hours

Problem fixed: Propshaft was bent

Took it off and made it straight and reinstall with new seals and bearing than put back oil

EXCELLENT, As Always!!! Great response and super fast shipping. A++++++

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Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.