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

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

This hydraulic trim oil line is engineered for OMC and Volvo Penta SX-M drivetrains from 1994 and newer equipped with a Port Down trim system and fore connections. It serves as a crucial component for connecting the trim cylinder to the manifold assembly, ensuring reliable operation of your boat's trim system.

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

• Installation Position: Port Down with Fore Connections
• Connection Type: Connects Trim Cylinder to Manifold Assembly
• Compatible Brands: OMC, Volvo Penta

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

Includes the following part:

• 1 x Oil Line (3857523)

Installation Guide

1. Safety First: Disconnect the boat's battery and ensure the engine is completely off.
2. Relieve Pressure: Relieve any hydraulic pressure from the trim system. Consult your service manual for the specific procedure for your model.
3. Prepare Work Area: Place an oil-absorbent pad or tray beneath the hydraulic line connections to catch any spills.
4. Disconnect Old Line: Using appropriate wrenches, carefully loosen and disconnect the fittings on the old hydraulic line at both the trim cylinder and the manifold.
5. Remove Old Line: Once disconnected, carefully remove the old oil line from the boat.
6. Install New Line: Position the new oil line and hand-tighten the fittings onto the clean threads of the cylinder and manifold.
7. Secure Connections: Use a wrench to tighten the fittings securely. Do not overtighten, as this can damage the threads or fittings.
8. Refill Fluid: Refill the hydraulic trim fluid reservoir with fluid recommended by your engine manufacturer.
9. Bleed the System: Reconnect the battery. Cycle the trim system fully up and down 5-10 times to bleed any trapped air.
10. Check for Leaks: With the system pressurized, carefully inspect both connection points for any signs of fluid leaks.
11. Top Off Fluid: Re-check the hydraulic fluid level and top it off as needed.

Troubleshooting & FAQ

Q: How do I confirm this oil line fits my engine?

A: This line is specifically for Volvo Penta and OMC SX-M drives manufactured from 1994 onwards. It is for the Port Down position with fore connections. The surest way to confirm fitment is to verify your original part number is 3857523.

Q: What are the signs my hydraulic trim line needs replacement?

A: Common signs of failure include visible hydraulic fluid leaks around the line or its fittings, a spongy or unusually slow trim response, or a trim system that fails to hold its position and "drifts" down.

Q: What type of fluid should I use with this line?

A: This line is fully compatible with standard Volvo Penta hydraulic trim fluid. Always use the specific hydraulic fluid recommended in your engine's official service manual to ensure proper performance and longevity.

Q: Is this listing for an OEM or aftermarket part?

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.