21884026 Gear Set | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta matched gear pair is used in AQ290 DuoProp and DP-D1 sterndrives with a 1.78:1 reduction ratio. The lapped gears must remain together as a set.

⚙️ Key Features

• Matched upper-gear pair
• Reduction ratio: 1.78:1
• AQ290 DP and DP-D1 application
• Factory tooth-contact pattern
• Drive serial and ratio verification required

🔌 Function

Transfers engine torque through the sterndrive at the specified reduction ratio.

⚠️ Common Signs of Failure

• Gear whine
• Pitting or chipped teeth
• Metal in gear oil
• Incorrect backlash or contact pattern
• Loss of drive

🛠️ Service Notes

• Gear sets are supplied as a matched set and must be fitted complete — never run a new gear against a used mate, and keep the set together as it was delivered
• Setting up requires the shimming, backlash and tooth contact pattern checks in the workshop manual for your engine and drive, together with the proper measuring and pressing tools; this is not a fit-and-hope job
• Establish why the old set failed before assembly — debris, a collapsed bearing or oil starvation will destroy the new gears just as quickly
• Renew the bearings, seals and locking hardware at the same time, and flush the housing thoroughly so no metal debris is left in it
• Fill with the oil specified for your drive, then check the oil early in service for signs of abnormal bedding-in debris

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21884026 → Supersedes 3861458 → Supersedes 854464 → Supersedes 853532

OEM / Related Numbers

• 3861458 earlier number superseded by this part
• 854464 earlier number superseded by this part
• 853532 earlier number superseded by this part

Other-Brand OEM Numbers

• VOE21884026

Aftermarket / Verified Equivalents

• Earlier/related ratio reference: 853532
• Related gear-set reference: 3860904 - verify drive revision

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging