Arm Extension Hydraulic Cylinder for Tarp Systems

If you manage a fleet of dump trailers or build automated covering systems for aggregate haulers, you already know how demanding tarp arm mechanics can be. The HR4719 Arm Extension Hydraulic Cylinder for Tarp Systems is catalog-listed by HCIC specifically to power the telescoping reach of heavy-duty tarp arms across open-top bodies.

In the official HCIC-2026 product catalog (p. 8), this unit is specified with three core dimensions:

• 1.5-inch bore
• 1.0-inch chrome rod
• 36-inch linear stroke
• Catalog Application: Arm Extension Cylinder

That gives you an ultra-clean, high-aspect-ratio cylinder designed to slide inside or alongside hollow extruded tarp arms, pushing the front crossbar smoothly over high-sided dump bodies without adding unnecessary dead weight up high.

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I. HR4719 Specifications

Note on unlisted fields: Like most OEM catalog replacement lines, specific port threads and retracted mounting center-to-center distances can be tailored to match your specific brand of tarp arm assembly (such as Aero, Roll-Rite, Mountain Tarp, or custom OEM designs).

II. Why the 1.5" Bore by 36" Stroke Works in Tarp Arm Applications

Tarp arm extension is all about controlled reach and rigidity. With a 1.5-inch bore and a 1.0-inch rod, the **HR4719 Arm Extension Hydraulic Cylinder for Tarp Systems** delivers a fast cycle time with minimal hydraulic fluid consumption.

2.1 Here is what makes this geometry practical for truck body builders:

1. Slender Profile Fits Inside Arm Tubing: A 1.5-inch bore barrel easily packages inside standard aluminum or steel square tubing used on telescoping tarp arms, shielding the cylinder body from falling gravel and asphalt debris.
2. Substantial 1.0" Rod Resists Whipping: With a 36-inch extension, slender rods can experience flex or lateral vibration caused by road bumps and wind drag on the extended tarp. The 1.0-inch rod diameter provides solid column rigidity across the full stroke.
3. Smooth Return Travel: The effective annular pull area ensures rapid retraction when pulling the arms back down into highway-travel position.

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III. Critical Fitment Checks Before Ordering a Replacement

Before ordering an actuator replacement or configuring a new production run, run through this quick 4-point shop checklist:

1. Verify Full Arm Travel: Confirm whether your mechanical linkage requires exactly 36 inches of cylinder travel or if mechanical stops inside the arm limit travel to a shorter stroke.
2. Inspect Internal Tube Clearances: Check the inner dimensions of your telescoping arm extrusions. Ensure adequate clearance for the cylinder barrel, grease fittings, and hose connections throughout the entire extension.
3. Check Hose Routing & Slack: Long 36-inch extension arms require hose loops that travel with the arm. Make sure hoses do not pinch against the trailer side rails or pivot hubs when folding.
4. Match Rod End Mounting: Whether your arm uses a cross-tube pin, female clevis, or threaded rod-end eye, ensure mounting dimensions match your pivot weldments.

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IV. What to Send with Your HR4719 Quotation Request

To get a fast and accurate OEM quote for the HR4719 Arm Extension Hydraulic Cylinder for Tarp Systems, provide our engineering team with:

- Existing arm manufacturer and model (if replacing an in-service unit)

- Desired port orientation and thread type (e.g., SAE #6, 1/4" NPT)

- Retracted mounting length (pin center to pin center)

- Pin diameter and clevis bracket width

- System relief pressure (e.g., 2,000 to 2,500 psi)

- Batch quantity and delivery destination

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V.FAQ

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VI. Contact HCIC for Engineering Support & Quotation

HCIC has supplied custom and replacement hydraulic cylinders for commercial vehicles and dump trailers worldwide since 1998.