21821908 Gear Set | Genuine Volvo Penta Part

🔧 Product Description

Matched DPR-D gear set for the upper-gear / clutch assembly. It must be installed as a matched set with the correct bearing preload, backlash and shimming for the drive serial number.

🚤 Compatibility

Typically suits:

• Volvo Penta DPR-D

• Engine Family: DPR

⚙️ Key Features

• Factory-matched gear members
• Drive-specific ratio and tooth geometry
• Hardened marine gear surfaces
• Requires controlled bearing setup
• Drive serial and ratio must match

📋 Kit Contents

• 1 × matched DPR-D gear set - 21821908
• Bearings, shims, spacer sleeves, sliding sleeve and shaft hardware shown in the drive diagram are serviced separately unless explicitly included in the sealed gear-set package

🔌 Function

Transmits engine torque through the DPR-D upper gear and clutch assembly at the specified ratio and direction.

⚠️ Common Signs of Failure

• Gear whine, rumble or knocking
• Pitted, chipped or spalled teeth
• Excessive backlash or heat
• Loss of reliable drive engagement

🛠️ 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

• 21821908 → Supersedes 21648770

OEM / Related Numbers

• 21648770 earlier number superseded by this part
• 3887255 - washer
• 22050739 - spacer tube
• 3849006 - sliding sleeve
• 3862368 - shaft

📦 Condition

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