Quicksilver Needle Roller Bearing 30956T – Mercury MerCruiser OEM
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Quicksilver Needle Roller Bearing 30956T (31-30956T)
Needle roller bearings do a quiet but critical job inside the lower unit — they support rotating shafts under load and keep friction low inside the gear housing. When one fails, you’ll typically hear it first: a whine, rumble, or roughness that gets worse under load. This is the genuine OEM bearing specified for compatible Mercury and MerCruiser lower-unit assemblies, engineered to the correct dimensions and load rating for the application.
Key Specifications
- Part Number: 30956T (OEM ref: 31-30956T)
- Type: Needle Roller Bearing
- Location: Lower-unit gearcase
- GTIN/UPC: 745061134867
- Genuine OEM — not aftermarket
Compatible Applications
Used on select Mercury and Mariner outboards including 45 Jet, 50, 55, 60, and mid-to-high horsepower models from 65 through 175 HP, as well as select MerCruiser Alpha One Generation II lower-unit drive assemblies. Always verify against your engine or drive’s current parts diagram and serial number before ordering — gearcase bearings can vary by shaft size, bearing location, housing style, and production range.
Aftermarket Cross-References
- Sierra Marine 18-1158
- SEI Marine 93-102-12
- GLM 11410
When to Replace
Replace if the bearing is worn, noisy, pitted, scored, seized, loose in the housing, or contaminated by water intrusion. Inspect during any lower-unit service involving gears, the propeller shaft, driveshaft, seals, or bearing carrier.
Installation Notes
Installation requires lower-unit disassembly and proper bearing removal and installation tools. Inspect the shaft surface, gear housing bore, seals, gears, and lubricant condition during service. Replace any related worn components and refill the gearcase with the correct lubricant after reassembly, following the Mercury service manual for your specific lower unit.
Related Products
Parts Desk Insights
Best used as a direct OEM replacement during lower-unit rebuilds or gearcase service on compatible Mercury and MerCruiser applications. Lower-unit bearings are not parts to match by appearance alone — even a small difference in bearing size or gearcase location can affect shaft alignment, noise, and gear life. Match by serial number and lower-unit diagram first. If you’re already in the lower unit for a seal or bearing carrier job, it’s worth inspecting this bearing at the same time — the labour to get back in is the same either way.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.