Hydraulic Trim Hose – Fits Volvo Penta SX & OMC Cobra (Replaces 3853857, 0985617, 0778126)
Hydraulic Trim Hose – Fits Volvo Penta SX & OMC Cobra (Replaces 3853857, 0985617, 0778126) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
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).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Hydraulic Trim Hose – Fits Volvo Penta SX & OMC Cobra (Replaces...
Product Details
This aftermarket Hydraulic Trim Hose – Fits Volvo Penta SX & OMC Cobra Sterndrives (Replaces 3853857) connects the hydraulic manifold to the port cylinder for the UP trim function. It is compatible with Volvo Penta SX series sterndrives and OMC Cobra/King Cobra sterndrives from 1986–1998.
This part is a direct replacement for Volvo Penta 3853857 / 0985617 / 0778126, OMC 3853857 / 0985617 / 0778126, Mercury 879083, Sierra 18-2135, and Mallory 9-71605.
- Designed for the port-side cylinder "UP" operation.
- Constructed from durable rubber with corrosion-resistant metal fittings.
- Includes one hydraulic hose for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3853857 |
| Volvo Penta | 0985617 |
| Volvo Penta | 0778126 |
| OMC | 3853857 |
| OMC | 0985617 |
| OMC | 0778126 |
| Mercury | 879083 |
| Sierra | 18-2135 |
| Mallory | 9-71605 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta Applications: This hose fits various SX-M, SX-C, SX-C1, SX-S, SX-CLT, and SX-SLT sterndrive models.
For OMC Applications: Compatible with Cobra and King Cobra sterndrives manufactured between 1986 and 1998.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | SX-M | 3853857 | Port Cylinder UP | |
| Volvo Penta | SX-C | 3853857 | Port Cylinder UP | |
| Volvo Penta | SX-C1 | 3853857 | Port Cylinder UP | |
| Volvo Penta | SX-S | 3853857 | Port Cylinder UP | |
| Volvo Penta | SX-CLT | 3853857 | Port Cylinder UP | |
| Volvo Penta | SX-SLT | 3853857 | Port Cylinder UP | |
| OMC | Cobra | 1986–1998 | 3853857 | Port Cylinder UP |
| OMC | King Cobra | 3853857 | Portside UP |
Technical Specs
- Product Type
- Power Trim Hydraulic Hose
- Installation
- Port Cylinder - UP Operation
- Connection
- Hydraulic Manifold to Cylinder
- Housing Material
- Rubber with Metal Fittings
- Housing Color
- Black
- Weight
- 0.09 lbs (0.04 kg)
- Other Technical Attributes
- For Port UP Operation
What’s in the Box
- 1 x Hydraulic Trim Hose (3853857)
Installation Notes
- Tilt the sterndrive to the full "UP" position and engage the trailering lock for safety.
- Place an oil-absorbent pad under the hydraulic connections to catch any fluid drips.
- Carefully disconnect the old hydraulic hose fittings from both the manifold and the trim cylinder.
- Install the new hose, ensuring fittings are clean and threaded correctly to avoid cross-threading.
- Tighten the fittings to the manufacturer's recommended torque specifications. Do not overtighten.
- Refill the hydraulic trim fluid reservoir to the correct level using the specified fluid type.
- Cycle the trim system up and down several times to bleed air from the system, checking the fluid level and topping off as needed.
- Inspect all connections for leaks before returning the vessel to service.
Troubleshooting & FAQ
How do I confirm this hose fits my sterndrive?
Verify your sterndrive model is listed in the Engine & Model Compatibility table. This hose is specifically for the port-side "UP" operation on OMC Cobra (1986–1998) and various Volvo Penta SX series models. Always compare the part number (3853857) and photos to your existing hose before ordering.
What are the signs of a failing trim hose?
Symptoms include visible fluid leaks around the hose or fittings, a spongy or slow trim response, or the sterndrive failing to hold its position. A visual inspection may reveal cracks, bulges, or abrasions on the hose.
Should I replace trim hoses in pairs?
While not required, it is often recommended to replace both the port and starboard hoses at the same time, especially if they are the same age. The other hose may be near the end of its service life and could fail soon after the first replacement.
What type of hydraulic fluid is recommended?
Always consult your sterndrive's service manual for the exact fluid specification. Most systems use a high-quality marine power trim and steering fluid. Using the wrong fluid can damage seals and other hydraulic components.
How do I bleed the system after installing the new hose?
After installation and refilling the reservoir, repeatedly run the trim system through its full range of motion (all the way up and all the way down) 5-10 times. This forces trapped air back into the reservoir. Check and top off the fluid level as the air is purged.
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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
