Primary Mover PF-310 Replacement Hydraulic Cylinder – Dump Trailer Scissor Hoist
Replacement hydraulic cylinder for the Primary Mover PF-310 dump trailer scissor hoist.
This heavy-duty hydraulic cylinder is designed as a direct replacement for the cylinder used in the Primary Mover PF-310 dump bed hoist system. It features a 3.5-inch diameter, 10-inch stroke, and heavy-wall construction engineered for demanding dump trailer applications.
IMPORTANT FITMENT NOTICE: This replacement cylinder is designed specifically for the Primary Mover PF-310 hoist. Primary Mover does not recommend installing this cylinder on another manufacturer’s dump hoist or scissor hoist. Cylinder stroke, closed length, mounting locations, pivot points, dump angle, frame geometry, and other engineering dimensions are critical to proper hoist operation. A cylinder that appears similar or physically fits is not necessarily compatible or safe for another manufacturer’s system.
After purchase, Primary Mover may contact you to confirm that this cylinder is being ordered for a compatible Primary Mover PF-310 hoist before the order is released.
Key Features
Designed for the Primary Mover PF-310
This cylinder is intended as a replacement component for the Primary Mover PF-310 hydraulic dump trailer scissor hoist.
Heavy-Duty 7.5 mm / 0.295″ Cylinder Wall
Primary Mover uses approximately 7.5 mm (0.295″) wall thickness in this cylinder. A thicker cylinder tube helps resist expansion under hydraulic pressure, supporting cylinder rigidity and long-term seal life in demanding dump trailer applications.
3.5-Inch Diameter & 10-Inch Stroke
The cylinder geometry is matched to the PF-310 hoist design to provide the intended lift range, dump angle, and operating characteristics of the complete hoist system.
Designed for High Hydraulic Pressure
Heavy-wall construction is designed to withstand hydraulic system pressures up to approximately 3,200 PSI without excessive cylinder tube deformation under normal intended operation.
Replacement for Worn or Damaged PF-310 Cylinders
Ideal when restoring an existing Primary Mover PF-310 dump hoist rather than replacing the complete dump bed kit.
Specifications
- Application: Primary Mover PF-310 Scissor Hoist
- Component Type: Replacement Hydraulic Cylinder
- Cylinder Diameter: 3.5″
- Stroke: 10″
- Cylinder Wall Thickness: Approximately 7.5 mm / 0.295″
- Maximum Hydraulic Pressure: Approximately 3,200 PSI
- Typical Hoist Lift Range: Approximately 3 to 4.5 tons depending on dump angle, mounting geometry, load position, hydraulic pressure, and overall trailer setup
- Compatibility: Primary Mover PF-310 hoist systems only
Important: Hoist lifting capacity is not determined by the hydraulic cylinder alone. Actual lifting performance changes throughout the dump cycle and depends heavily on hoist geometry, dump angle, load position, hydraulic pressure, trailer construction, and installation. Refer to the applicable Primary Mover lift data for performance information.
Replacement Cylinder Only
This listing includes the replacement hydraulic cylinder only. It is not a complete dump trailer conversion kit and is not intended by itself to convert a pickup truck, flatbed, trailer, or other vehicle into a hydraulic dump system.
If you are building a new dump bed or converting an existing trailer, select a complete Primary Mover dump hoist kit engineered for that application.
Frequently Asked Questions
No. The PF-310 replacement cylinder is specifically designed for the Primary Mover PF-310 scissor hoist. It should not be treated as a universal replacement 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 trailer structure. Primary Mover does not approve or certify compatibility of this cylinder with another manufacturer’s system.
A dump hoist creates very different mechanical leverage as the bed moves through its lifting range. Small changes in cylinder mounting position, stroke, closed length, pivot location, or hoist geometry can substantially change cylinder pressure, structural loading, lifting force, and dump angle.
For this reason, matching only the cylinder diameter and stroke is not enough to establish compatibility with another 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-310 cylinder uses an approximately 7.5 mm (0.295″) wall thickness to provide greater resistance to this expansion and support longer-term durability in demanding dump trailer applications.
Watch our Hydraulic Cylinder Wall Thickness Comparison Video
Primary Mover may contact you after purchase to confirm that the replacement cylinder is being ordered for a Primary Mover PF-310 hoist. This helps prevent incorrect replacement-cylinder purchases and ensures that the correct component is being supplied.
The PF-310 system typically operates in approximately the 3 to 4.5 ton lifting range depending on dump angle, load position, hydraulic pressure, trailer 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.
This cylinder is sold as a replacement component for the Primary Mover PF-310 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, 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-310 hoist frame and related components remain in serviceable condition, this replacement cylinder allows you to replace the cylinder without purchasing an entirely new hoist assembly.
No. This listing is for the replacement hydraulic cylinder only. A complete PF-310 dump hoist kit includes the engineered hoist structure and additional components required for a complete installation.
Why Choose Primary Mover Replacement Components?
- Correct Fitment: Replacement components designed around the geometry of the original Primary Mover hoist.
- Heavy-Wall Cylinder Construction: Approximately 7.5 mm / 0.295″ wall thickness designed to better resist tube expansion under hydraulic pressure.
- Application Support: Our team can help identify the correct replacement component for your Primary Mover system.
- Hydraulic Expertise: Purpose-built hydraulic components backed by real-world dump trailer experience.
Restore your Primary Mover PF-310 dump trailer hoist with the replacement cylinder engineered for the original system.