3853857 Hydraulic Trim Hose for Volvo Penta OMC | JLM Marine

Hydraulic Trim Hose for Volvo Penta OMC Sterndrives – OEM 3853857

This hydraulic trim hose is engineered as a direct replacement for Volvo Penta and OMC sterndrive systems, specifically fitting SX-M, SX-C, SX-C1, SX-S, SX-CLT, SX-SLT models and Cobra and King Cobra (Portside Up) drives. Designed to connect the manifold to the cylinder port (up position), this hose ensures reliable hydraulic pressure transfer for precise trim and tilt operation.

This aftermarket hose directly replaces multiple OEM part numbers including Volvo Penta 3853857, 984024, 985617, 0985617, OMC 3853857, Mercury 879083, and Sierra 18-2135. Built for durability in harsh marine environments, it provides a cost-effective solution for maintaining your sterndrive's hydraulic trim system.

• Installation position: Manifold to Cylinder Port (Up)
• Direct fit for Volvo Penta SX-series and OMC Cobra sterndrives (1988-1993)
• Facilitates easy repairs and maintenance with precise OEM-equivalent fitment

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

Your package includes:

• 1x Hydraulic Trim Hose (Trim Pump to Connector)

Note: The package contains all the parts shown in the product images.

Installation Guide

1. Preparation: Ensure the sterndrive is in the full down position and the engine is off. Gather necessary tools including wrenches and a drain pan.
2. Depressurize System: Release hydraulic pressure by turning the manual release valve or operating the trim switch several times with the engine off.
3. Access the Hose: Locate the trim hose connection between the manifold and cylinder port (up position) on your Volvo Penta or OMC sterndrive.
4. Drain Fluid: Place a drain pan beneath the connection points. Carefully loosen the fittings and allow hydraulic fluid to drain into the pan.
5. Remove Old Hose: Disconnect the hydraulic hose from both the manifold and cylinder port fittings. Note the routing path for reinstallation.
6. Inspect Fittings: Check both connection points for corrosion, debris, or damage. Clean threads and sealing surfaces as needed.
7. Route New Hose: Position the new hydraulic trim hose along the same path as the original, ensuring it does not contact sharp edges or moving components.
8. Connect Fittings: Thread the hose onto the manifold and cylinder port fittings hand-tight first, then tighten with a wrench to manufacturer specifications. Do not over-tighten.
9. Refill Hydraulic Fluid: Add the manufacturer-recommended hydraulic fluid to the trim reservoir until it reaches the proper level.
10. Bleed Air: Operate the trim switch in both up and down directions several times to purge air from the system. Check fluid level and top off as needed.
11. Inspect for Leaks: With the engine running, cycle the trim system through its full range while checking all connections for leaks. Tighten fittings if necessary.
12. Final Check: Verify smooth trim operation and proper fluid level. Test the system under normal operating conditions before extended use.

Troubleshooting & FAQ

Q: How do I confirm this hose fits my sterndrive?
A: Cross-reference your original part number with the table above (Volvo Penta 3853857, 984024, 985617; OMC 3853857; Mercury 879083; Sierra 18-2135). This hose fits Volvo Penta SX-series and OMC Cobra/King Cobra sterndrives from 1988-1993, specifically the manifold to cylinder port (up) position.

Q: What are the signs that my hydraulic trim hose needs replacement?
A: Common symptoms include visible cracks or swelling in the hose, hydraulic fluid leaks around connections, slow or erratic trim operation, loss of trim holding power, or low hydraulic fluid levels requiring frequent refilling.

Q: Can I replace just this hose or should I replace all hydraulic lines at once?
A: You can replace this hose individually if it's the only component showing wear or damage. However, if your sterndrive is older or other hoses show signs of aging (cracking, hardening), consider replacing all hydraulic lines as preventive maintenance.

Q: How often should I inspect or replace this hydraulic trim hose?
A: Inspect hydraulic hoses annually for cracks, swelling, or leaks as part of routine maintenance. Replace immediately if damage is found. In normal conditions, quality hydraulic hoses can last 5-10 years, but exposure to UV, heat, and saltwater may shorten lifespan.

Q: Is this 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.