Cylinder PF-630 Dump Bed Cylinder Replacement.

No. The PF-630 replacement cylinder is specifically designed for the Primary Mover PF-630 scissor hoist. It should not be treated as a universal dump trailer cylinder based only on bore size, stroke, mounting style, or physical dimensions.

Primary Mover does not recommend installing this cylinder on another manufacturer's hoist. Hydraulic dump hoists depend on specific cylinder mounting points, closed and extended lengths, pivot locations, frame geometry, dump angle, and structural design.

Installing a cylinder that was not engineered for the original hoist can significantly change the forces applied to the hoist and dump body structure. Primary Mover does not approve or certify compatibility of this cylinder with another manufacturer's system.

Scissor hoists create changing mechanical leverage as the dump body moves through its lifting range. Small differences in cylinder mounting position, stroke, closed length, pivot location, or hoist geometry can substantially change cylinder pressure, structural loading, lifting force, and final dump angle.

For this reason, matching cylinder diameter and stroke alone is not enough to establish compatibility with another dump hoist.

Absolutely—cylinder wall thickness matters. A hydraulic cylinder tube is repeatedly subjected to internal pressure every time the dump body is raised. Thinner-wall cylinder tubes can be more prone to expanding or flexing under repeated high-pressure operation.

Over time, excessive tube expansion can affect the relationship between the cylinder bore, piston, and seals, increasing seal wear and potentially contributing to premature seal failure.

The Primary Mover PF-630 cylinder uses an approximately 10 mm (0.394") wall thickness to provide greater resistance to tube expansion and support long-term durability in higher-load dump trailer and dump body applications.

Watch our Hydraulic Cylinder Wall Thickness Comparison Video

The PF-630 is designed for some of the largest and most demanding applications in the Primary Mover scissor hoist lineup. Its large 6.5-inch cylinder can generate substantial force at normal hydraulic system pressures.

The approximately 10 mm (0.394") wall thickness provides additional cylinder tube rigidity and helps limit expansion under repeated hydraulic pressure, supporting durability and seal life in demanding applications.

The extended 30-inch stroke is part of the complete PF-630 hoist geometry and provides the travel required for large dump bodies and the intended dump angle of the system.

The longer stroke should not be treated as a stand-alone upgrade for another hoist. Cylinder travel must be matched to the mounting geometry, pivot locations, frame design, and structural characteristics of the complete dump hoist.

The PF-630 belongs to Primary Mover's wide heavy-frame scissor hoist series. Compared with smaller standard-frame hoists, this series uses a larger hoist structure designed for bigger dump bodies, heavier loads, and more demanding truck and trailer applications.

Yes. The PF-630 is currently the largest cylinder used in the Primary Mover scissor hoist lineup, combining a 6.5-inch diameter with a 30-inch stroke for large-body and heavy-duty applications.

Primary Mover may contact you after purchase to confirm that the replacement cylinder is being ordered for a Primary Mover PF-630 hoist. This helps prevent incorrect replacement-cylinder purchases and ensures that the component is intended for the correct Primary Mover system.

The PF-630 system typically operates in approximately the 12 to 15.4 ton lifting range depending on dump angle, body length, load position, hydraulic pressure, trailer or truck setup, and hoist geometry.

Hydraulic dump hoist lifting capacity changes throughout the dump cycle. Refer to the Primary Mover lift data chart for more detailed performance information.

Yes. Dump body length, hoist mounting position, load placement, and the location of the body's center of gravity all affect the mechanical leverage placed on the hoist.

For that reason, lift capacity should always be evaluated using the applicable Primary Mover lift data and installation requirements for the specific body length and application.

This cylinder is sold as a replacement component for the Primary Mover PF-630 hoist and is not intended as a stand-alone component for designing a custom dump hoist.

If you are building or converting a dump trailer or dump body, Primary Mover recommends using a complete engineered hoist kit rather than designing a lifting system around an individual replacement cylinder.

Not necessarily. If your existing Primary Mover PF-630 hoist frame, pivot points, mounting structure, and related components remain in serviceable condition, this replacement cylinder may allow you to repair the hoist without replacing the complete assembly.

No. This listing is for the replacement hydraulic cylinder only. The complete PF-630 dump hoist kit includes the engineered wide heavy-frame scissor hoist structure and additional components required for a complete dump body installation.