MANUTEX 3-Ton Floor Jack Plunger Kit — Dual-Pump Low-Side Replacement with 2 Plunger Sets

MANUTEX replacement plunger kit restores hydraulic pressure and load performance for 3-ton floor jacks with dual low-side pumps.

If your 3-ton hydraulic floor jack with dual pumps (models like Pitts-burgh, Har-bor F-reight, Day-tona, Ar-can, or Tori-n Big R-ed) is losing lifting power or not holding pressure, worn low-side plungers and cylinders are often the cause. This MANUTEX kit supplies two distinct low-side plunger assemblies — one larger and one smaller — plus springs, retainers, covers and C-rings to bring the jack back to correct operation. Before ordering, compare the listed dimensions to your existing parts, since the two supplied sets are different sizes by design.

How will this kit fix a jack that won’t lift fully?

Worn or damaged low-side plungers let hydraulic fluid bypass or fail to move correctly between pump stages, reducing stroke and lifting capability. Replacing both low-side plungers and their cylinders restores the intended fluid seal and pump action so the jack regains full height and capacity.

• Includes both the larger (2.88" x 0.86" plunger) and smaller (2.85" x 0.59" plunger) low-side plunger sets.
• Cylinders sized 2.59" x 1.19" and 2.59" x 1.04" ensure correct seating and stroke.
• Complete hardware: springs, retainers, covers and C-rings for straightforward assembly.

Which floor jack models are compatible with these replacement parts?

The kit is made for many common 3-ton hydraulic floor jacks that use dual low-side pumps. It’s broadly compatible but not universal — always measure your current plungers and cylinders to confirm fit before installing.

• Works with 3-ton dual-pump jacks including Pitts-burgh, Har-bor F-reight, Day-tona, Ar-can, and Tori-n Big R-ed variants.
• Supplied as two non-identical sets to match the bigger and smaller low-side pumps in dual-pump systems.
• Check the listed dimensions against your jack parts to avoid mismatched components.

What are the exact dimensions and parts included in the package?

This MANUTEX kit provides two full low-side plunger assemblies with precise measurements so you can confirm compatibility. Each set contains the plunger, cylinder, retainer, spring, protective cover and a C-ring for secure retention.

• Bigger low-side plunger: 2.88" x 0.86" (with seals); cylinder: 2.59" x 1.19".
• Smaller low-side plunger: 2.85" x 0.59" (with seals); cylinder: 2.59" x 1.04"; capacity per stand: 3-1/2".
• Package contains two complete plunger sets — note differing dimensions between sets.

How easy is installation and what should I prepare?

Installation requires basic mechanical skill and common hand tools. Drain or secure hydraulic fluid safely, disassemble the pump area to access the low-side plungers, replace both plunger assemblies, and reassemble following manufacturer torque/clearance guidelines.

• Prepare a clean workspace and collect pliers, retaining-ring tools, and basic sockets or screwdrivers.
• Inspect seals and springs; replace any additional worn components for best results.
• Test lift and check for leaks after reassembly; bleed air from the system as needed.

Who is this for? This MANUTEX plunger kit is intended for mechanics, home garage owners and shop technicians who service 3-ton dual-pump floor jacks and need a reliable, dimension-specific replacement to restore lifting height and hydraulic performance. It's ideal for anyone comfortable with disassembling the pump area and reinstalling small hydraulic components, and for users who confirmed their jack matches the kit's measurements before purchase.