Alpha One Gen.1 (bottom Gear)

MerCruiser Alpha One Gear spare parts (Lower Unit)

MerCruiser Alpha One Gear spare parts are crucial for the reliable functioning of the Z-drive. In this category you will find suitable components for the maintenance, repair and servicing of the MerCruiser Alpha One gear - from seals and bearings to other drive parts. All spare parts are designed for high accuracy of fit and long-lasting use in the marine sector.
Original spare part
Water inlet strainer for Mercruiser Alpha starboard, MD934231
Mercury-Mercruiser-Quicksilver
Water inlet strainer for Mercruiser Alpha starboard, MD934231
article nr.02327

Water Pick Up Inserts Starboard.
Mercruiser Ref. no.: 934231

7,89 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Mercruiser water pipe MC1 / R / MR Alpha One Gen 1, MD23-29804T
Mercruiser water pipe MC1 / R / MR Alpha One Gen 1, MD23-29804T
article nr.09583

n Water pipe for Mercruiser R, MR and Alpha One Gen.1.
Mercruiser No. 23-29804T

7,95 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Washer 12-31266
Recmar
Washer 12-31266
article nr.REC12-31266

WASHER

8,40 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
O-ring Mercruiser 27880
Recmar
O-ring Mercruiser 27880
article nr.REC12-27880

O-RING

8,55 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
(Max quantity: 1 Piece)
Original spare part
Tapered bearing for Mercuiser Alpha One Gen 2, MD33138A1
Mercury-Mercruiser-Quicksilver
Tapered bearing for Mercuiser Alpha One Gen 2, MD33138A1
article nr.09108

tapered bearing for drive shaft
Mercruiser No. 31-33138A1

70,13 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Drive shaft for Mercruiser Alpha One, MD42634
Drive shaft for Mercruiser Alpha One, MD42634
article nr.03025

Mercruiser ref. no. 45-42634

251,03 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
(Max quantity: 1 )
Propeller shaft carrier for Mercruiser R / MR / Alpha One (also Gen.2), MD818763A10
Propeller shaft carrier for Mercruiser R / MR / Alpha One (also Gen.2), MD818763A10
article nr.03023

Mercruiser ref. no. 818763A10

150,38 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Lock washer for Mercruiser carrier nut, 18323
Mercury-Mercruiser-Quicksilver
Lock washer for Mercruiser carrier nut, 18323
article nr.02345

Mercruiser No. 14-18323

24,13 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Clutch for Mercruiser Alpha One, MD853594T
Clutch for Mercruiser Alpha One, MD853594T
article nr.03021

Mercruiser ref. no. 853594T

119,71 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
(Max quantity: 6 )
Original spare part
Forward gear set for Mercruiser MR/Alpha One/ Gen.2, 13:21 878087A2
Mercury-Mercruiser-Quicksilver
Forward gear set for Mercruiser MR/Alpha One/ Gen.2, 13:21 878087A2
article nr.03020

For Mercruiser MR, Alpha One and Alpha One Gen.2. 13:21
Mercruiser No. 878087A2

831,77 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Gear set (forward) for Mercruiser Alpha One, 878087A4
Gear set (forward) for Mercruiser Alpha One, 878087A4
article nr.03019EOL

Gear set 13-21 teeth.
Mercruiser No. 43-878087A4

1.346,17 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Gear set for Mercruiser Alpha up to 1995, 878087A4
Gear set for Mercruiser Alpha up to 1995, 878087A4
article nr.03017EOL

Mercruiser No. 43-878087A4

1.346,17 EUR / Set
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Original spare part
Gear wheel nut (pinion nut) for Mercruiser Alpha, 35921
Mercury-Mercruiser-Quicksilver
Gear wheel nut (pinion nut) for Mercruiser Alpha, 35921
article nr.02324

Mercruiser / Mercury No. 11-35921

6,55 EUR / Piece
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Lower Z-drive parts (gear) for Mercruiser MR, Alpha One Gen.1 models
Lower Z-drive parts (gear) for Mercruiser MR, Alpha One Gen.1 models
article nr.09255

For Mercruiser MR, Alpha One Gen.1 models

product details
Original spare part
Reverse gear pinion for Mercruiser Alpha, 828073A1
Mercury-Mercruiser-Quicksilver
Reverse gear pinion for Mercruiser Alpha, 828073A1
article nr.03022

For Alpha One and Alpha One Gen.2.
Mercruiser No. 43-828073A1

226,19 EUR
incl. 19% VAT
Lieferung Wed 05. Aug - Mon 10. Aug 2026 **
24 months statutory warranty
Displaying 21 to 35 (of 35 products)
  • Over 15 years’ experience in the marine spare parts trade
    Over 15 years’ experience in the marine spare parts trade
  • Official Mercury & MerCruiser dealer
    Official Mercury & MerCruiser dealer
  • A wide range of boat engine spare parts from A to Z
    A wide range of boat engine spare parts from A to Z
  • Spare parts for Volvo Penta, MerCruiser, Yamaha, Honda, Suzuki and more
    Spare parts for Volvo Penta, MerCruiser, Yamaha, Honda, Suzuki and more
  • Fast delivery for maintenance, servicing and repairs
    Fast delivery for maintenance, servicing and repairs
  • Order boat spare parts conveniently online 24/7
    Order boat spare parts conveniently online 24/7

The MerCruiser Alpha One Z-drive is one of the most frequently used sterndrive systems in the leisure boat sector worldwide. Regular maintenance and the timely replacement of worn components are crucial to ensure the long-term performance and operational reliability of the drive system.

Important components of the Alpha One gearbox

The gearbox of the MerCruiser Alpha One drive consists of numerous precisely matched components. Particularly stressed components are

  • Gearbox seals

  • Bearings and shaft seals

  • Gear wheels and transmission components

  • Drive shafts

  • Seal kits for maintenance and repair

During operation, these parts are subject to high mechanical loads and permanent contact with water and lubricants.

Typical causes of wear in the Alpha One drive

Wear on the MerCruiser Alpha One Gear is primarily caused by

  • high torques in the drivetrain

  • long-term stress on the bearings and gears

  • Water ingress due to damaged seals

  • insufficient maintenance intervals

Early replacement of critical components prevents consequential damage to the entire Z-drive.

Suitable spare parts for maintenance and repair

In the Marine-Discount24 range you will find a large selection of MerCruiser Alpha One Gear spare parts for various years of construction and drive generations. The components on offer are specially tailored to the requirements of MerCruiser drives and enable precise repair of the transmission system.

Typical areas of application:

  • Gearbox overhaul

  • Replacement of worn seals

  • Maintenance of drive shafts

  • Repair of bearings in the gear housing

Spare parts for MerCruiser drives at Marine-Discount24

Marine-Discount24 offers an extensive range of MerCruiser spare parts for Alpha and Bravo drives. Thanks to clear categorization, suitable components for maintenance, repair and servicing can be found quickly.

Advantages:

  • Large selection of compatible spare parts

  • Suitable components for many MerCruiser models

  • Reliable spare parts supply for Sterndrive drives

  • Fast shipping and professional processing

This ensures that your MerCruiser Alpha One drive remains efficient and ready for use in the long term.