Hydraulic Trim Hose – Fits Volvo Penta SX & OMC Cobra Sterndrives (Replaces 3853857)

Hydraulic Trim Hose – Fits Volvo Penta SX & OMC Cobra Sterndrives (Replaces 3853857)

This hydraulic trim hose connects the hydraulic manifold to the port cylinder for UP operation. It is designed for use with a range of Volvo Penta SX-series and OMC Cobra sterndrives, ensuring reliable performance for your power trim system.

This component is a direct replacement for Volvo Penta part numbers 3853857, 0985617, and 0778126; OMC part numbers 3853857, 0985617, and 0778126; Mercury part number 879083; Sierra part number 18-2135; and Mallory part number 9-71605.

• Installation Location: Connects the hydraulic manifold to the port cylinder.
• Function: Enables the 'UP' trim operation.
• Included: One hydraulic trim hose.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Volvo Penta Applications

OMC Applications

Technical Specifications

Package Contents

• 1 x Hydraulic Trim Hose (Replaces OEM Part 3853857)

Installation Guide

1. Safety First: Before starting, disconnect the boat's battery and ensure the sterndrive is in a safe, supported position.
2. Relieve Pressure: Carefully relieve any pressure from the hydraulic trim system by slightly loosening the manual release valve. Have rags ready to catch any fluid.
3. Access the Hose: Locate the old hydraulic hose connecting the manifold to the port-side trim cylinder. Clean the area around the fittings to prevent contamination.
4. Remove Old Hose: Using appropriate wrenches, carefully disconnect both ends of the hose. Be prepared for residual fluid leakage.
5. Install New Hose: Connect the new hose, ensuring the fittings are correctly threaded and aligned. Do not cross-thread the fittings.
6. Tighten Fittings: Securely tighten both ends of the hose to the manufacturer's recommended torque. Do not overtighten, as this can damage the fittings or threads.
7. Bleed the System: Top off the hydraulic fluid reservoir and bleed the air from the system by cycling the trim up and down several times. Check the fluid level again and add more if needed.
8. Inspect for Leaks: With the system pressurized, carefully inspect the new hose and fittings for any signs of leaks.

Troubleshooting & FAQ

Q: How do I confirm this hose fits my sterndrive?
A: The best way to ensure compatibility is to check your sterndrive's model (e.g., Volvo Penta SX-M, OMC Cobra) and year against the compatibility tables above. Also, verify that your original part number matches one of the numbers listed in our cross-reference table, such as 3853857.

Q: Which side and operation is this hose for?
A: This specific hose is for the port (left) side of the sterndrive and controls the UP operation of the power trim.

Q: What are the common signs that my trim hose needs to be replaced?
A: Common indicators include visible hydraulic fluid leaks around the hose or its fittings, a spongy or delayed response from the trim system, or visible cracks, bulges, or abrasion on the hose itself.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.