Hydraulic Trim Oil Line – Fits Volvo Penta SX-M Port Down (Replaces 3857523)

Hydraulic Trim Oil Line – Fits Volvo Penta SX-M Port Down (Replaces 3857523)

This hydraulic trim oil line is designed for Volvo Penta SX-M drivetrains from 1994 and newer equipped with a Port Down trim system. It facilitates the crucial connection between the trim cylinder and the manifold assembly, ensuring proper hydraulic fluid flow for trim and tilt operations.

This part is a direct replacement for Volvo Penta part number 3857523 and OMC part number 3857523.

• Installation Position: Mounts on the Port Down side with fore connections.
• Connection Type: Connects the trim cylinder directly to the manifold assembly.
• Primary Component: Includes one hydraulic oil line required for the specified connection.

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.

Technical Specifications

Package Contents

• 1 x Oil Line (3857523)

Explosion Diagram

Installation Guide

1. Ensure the engine is off and the hydraulic system is fully depressurized before starting.
2. Locate the existing trim oil line connecting the port-side trim cylinder to the manifold assembly.
3. Place absorbent pads or a container underneath the fittings to catch any hydraulic fluid.
4. Carefully use two wrenches to loosen and disconnect the fittings on both ends of the old line.
5. Visually compare the new oil line to the old one to ensure the length and fittings are identical.
6. Install the new oil line, starting the threads by hand to prevent cross-threading.
7. Securely tighten both fittings, but do not overtighten.
8. Check the hydraulic fluid reservoir and top it off with the manufacturer-recommended fluid.
9. Cycle the trim/tilt system up and down several times to bleed any air from the hydraulics.
10. Carefully inspect both connections for any signs of leaks. Top off the fluid level again if needed.

Troubleshooting & FAQ

How do I confirm this oil line fits my specific drive?
This line is specifically for Volvo Penta and OMC SX-M drivetrains manufactured from 1994 onwards that use a Port Down with Fore Connections trim setup. The most reliable method is to match the OEM part number, 3857523, with the part you are replacing.

What are the common signs of a failed trim oil line?
A failing oil line typically results in hydraulic fluid leaks, which you may notice in the water or on the driveway. Performance issues include a slow, jerky, or completely unresponsive trim/tilt system, often because the system cannot maintain pressure.

Is any special tool required for installation?
Standard wrenches are typically sufficient for removing the old line and installing the new one. Using two wrenches (one to hold the fitting stationary and one to turn the nut) is recommended to avoid damaging the components.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.