Trim Cylinder Rebuild Kit – Fits Volvo Penta SX-A, DPS-A/B, OceanX (Replaces 3889958, 3889959)
Trim Cylinder Rebuild Kit – Fits Volvo Penta SX-A, DPS-A/B, OceanX (Replaces 3889958, 3889959) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Trim Cylinder Rebuild Kit – Fits Volvo Penta SX-A, DPS-A/B, OceanX ...
Product Details
This Trim Cylinder Rebuild Kit – Fits Volvo Penta SX-A, DPS-A/B, OceanX (Replaces 3889958, 3889959) provides all necessary seals and components to service round-capped hydraulic trim cylinders on Volvo Penta SX-A, DPS-A, DPS-B, and OceanX sterndrives.
It serves as a direct replacement for Volvo Penta part numbers 3889958 and 3889959, as well as Five Star Marine FSM127.
- Engineered for field serviceability, allowing for on-site repairs.
- Features ethanol-resistant Viton and high-grade urethane seals for longevity.
- Provides excellent resistance to UV, oxidation, and harsh marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3889958 |
| Volvo Penta | 3889959 |
| Five Star Marine | FSM127 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta models, this kit is specifically designed for sterndrives using round-capped hydraulic trim cylinders as listed.
| Brand | Model | Drive Type | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | SX-A | Sterndrive | 3889958, 3889959 | For round-capped hydraulic trim cylinders |
| Volvo Penta | DPS-A | Sterndrive | 3889958, 3889959 | For round-capped hydraulic trim cylinders |
| Volvo Penta | DPS-B | Sterndrive | 3889958, 3889959 | For round-capped hydraulic trim cylinders |
| Volvo Penta | OceanX | Sterndrive | 3889958, 3889959 | For round-capped hydraulic trim cylinders |
Technical Specs
- Product Type
- Hydraulic Trim Cylinder Rebuild Kit
- Application
- Round-capped hydraulic trim cylinders
- Installation
- Field serviceable
- Housing Material
- Compatible with aluminum cylinder bodies
- Components
- Viton and high-grade urethane seals
- Wiper Seal Material
- Viton (DuPont formulation)
- Other Technical Attributes
- Ethanol-resistant, UV-resistant, oxidation-resistant
- Package Dimensions
- 14.5 x 14.0 x 2.5 inches
- Weight
- 0.06 kg (2.08 oz)
What’s in the Box
- Outer cylinder cap o-rings
- Inner cylinder cap o-rings
- Viton cylinder cap wiper seals
- Piston seals
- OEM style piston back-up rings
- Piston-to-rod o-rings
Installation Notes
- Safely raise and support the sterndrive in an accessible position.
- Thoroughly clean the area around the trim cylinder end caps to prevent contamination.
- Disconnect the hydraulic lines, taking care to manage any fluid spillage.
- Carefully remove the cylinder end cap. Special tools may be required.
- Extract the piston and rod assembly from the cylinder body.
- Remove all old seals, o-rings, and back-up rings from the cap and piston, noting their orientation.
- Install the new seals from the kit, ensuring they are seated correctly.
- Lightly lubricate the new seals with fresh hydraulic fluid before reassembly.
- Reassemble and reinstall the cylinder, then reconnect the hydraulic lines.
- Bleed the hydraulic system according to the manufacturer's procedure to remove all air before use.
Troubleshooting & FAQ
How do I confirm this kit fits my specific cylinder?
This kit is designed for Volvo Penta SX-A, DPS-A, DPS-B, and OceanX drives with round-capped trim cylinders. Verify your drive model and confirm your cylinder caps are round, not flat-topped with four bolts. Cross-reference your cylinder part number with the provided list (3889954-3889959) for an exact match.
What are the signs my trim cylinder seals need replacing?
Common symptoms include a visible hydraulic fluid leak around the cylinder cap or rod, a spongy or slow trim response, or the sterndrive failing to hold its position ("drifting down"). A visual inspection for cracked or degraded wiper seals is also a key indicator.
Is any special tool required for installation?
A pin wrench (spanner wrench) is typically required to safely remove and reinstall the round cylinder end caps without causing damage. Using improper tools like a pipe wrench can scar the aluminum cap, leading to future leaks.
How are the materials in this kit different from OEM seals?
This kit uses high-grade Viton and urethane, materials known for their excellent resistance to modern ethanol-blended fuels, UV exposure, and hydraulic fluid degradation. The performance and durability are designed to meet or exceed original factory specifications.
Can this kit fix a cylinder with a bent rod or corroded body?
No. This kit replaces seals only. It cannot repair mechanical damage such as a bent or scored piston rod, or deep corrosion and pitting on the cylinder body or end cap. Inspect all metal components for damage before proceeding with a rebuild.
What is the recommended maintenance interval for trim seals?
There is no fixed replacement interval. Seals should be inspected annually for signs of wear, cracking, or leakage. Proactive replacement every 5-7 years, especially in saltwater environments, can prevent unexpected failures.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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