Denison Hydraulic Pump Guide: Gold Cup, T6 & T7 Series Explained

Denison hydraulics built a reputation for rugged, high-pressure pumps used across industrial and mobile machinery. Whether you run a Gold Cup piston pump or a T-series vane pump, identifying the exact model is the key to ordering the right cartridge, seal kit, or replacement unit. This guide explains the main Denison pump families and how to read them.

Denison Gold Cup piston pumps

The Gold Cup line is Denison's flagship variable-displacement piston pump series, prized for high-pressure performance and precise control. Common designations include the P6, P7, P8, P11, P14, P24, and P30 frame sizes, along with the PV6, PV10, PV15, PV20, PV29, and PVT variants. The number generally reflects the frame size and displacement class, while trailing characters define the control type, porting, and shaft.

Denison T6 and T7 vane pumps

Denison's T-series vane pumps are workhorse industrial units. The T6 family spans T6, T6C, T6D, T6E, T6CM, and T6CP single units, plus T67, T67C, T67D, and T67E variants; the T7 family includes T7, T7B, and T7D/T7E. Denison also builds double and triple units (for example T6CC, T6DC, T6EC) that combine two or three pumping sections on one shaft.

How to read a Denison model number

Denison codes start with the series prefix (Gold Cup P-series or T-series), followed by fields for displacement, port position, shaft configuration, and control or relief options. Because double and triple units stack multiple sections, note every section's displacement code. Always transcribe the full string from the nameplate exactly — a single character can distinguish a T6C from a T6D.

Who owns Denison now?

Denison was acquired by Parker Hannifin, so many Denison units are now cross-referenced within the Parker catalog. RestoPower carries aftermarket replacement parts compatible with original Denison-branded equipment regardless of the ownership change.

Find your Denison parts at RestoPower

We stock aftermarket, OEM-equivalent Gold Cup piston pump parts, T6/T7 vane pump parts, and Denison seal kits, backed by a 2-year no-hassle warranty and same or next-day shipping from Lake Orion, MI. Sourcing hard-to-find or obsolete Denison parts is one of our specialties — browse Denison parts or browse all hydraulic parts and send us your full model number for a same-day quote. Request a quote or download Denison parts catalogs and rebuild guides for exploded views and service data.

Denison seal kits vs. cartridge and rebuild parts

Most Denison repairs start with a hydraulic seal kit that replaces the shaft seal, cover O-rings, and static seals to stop leaks. On T6 and T7 vane pumps, the next most common part is the cartridge kit — the ring, vanes, and rotor that carry the wear — which is replaced as a unit when the pump loses pressure or flow. On Gold Cup piston pumps, worn output usually means the rotating group (pistons, shoes, valve plate, or bearings) needs attention. A seal kit stops leaks but will not restore a worn cartridge or rotating group, so identify which you need before ordering. Send us your full model code and we will confirm the exact Denison parts your pump requires.

Denison applications and common failure signs

Denison Gold Cup piston pumps and T6/T7 vane pumps run in injection-molding machines, presses, machine tools, marine systems, and heavy mobile equipment. Because these units are built for high pressure and long service, the failures we see most are cartridge wear on the vane pumps, rotating-group wear on the Gold Cup piston pumps, and shaft-seal leaks from age and contamination. A pump that leaks at the shaft usually needs a seal kit; a T6/T7 that builds pressure slowly or loses flow typically needs a new cartridge; and a Gold Cup that runs hot or weak often needs rotating-group parts. Since Denison is now part of the Parker family, some units cross-reference into the Parker catalog — we supply aftermarket, OEM-equivalent Denison parts either way to keep your equipment running.

Related guides

• How to Read a Parker Hannifin Pump Model Number
• Oilgear Pump Parts Guide: PVG, PVWH & PVWJ Series
• How to Read a Vickers / Eaton Pump Model Number

Frequently asked questions

What Denison pump series does RestoPower carry?
We support aftermarket OEM-equivalent parts for Denison T6 and T7 vane pumps and Gold Cup piston pumps including the P6, P7, P8, P11, P14, P24, and P30 series.

Can you source obsolete Denison parts?
Yes. Sourcing hard-to-find and obsolete hydraulic parts is a RestoPower specialty. Send us your full Denison model number and we will locate the correct parts.

What warranty do Denison parts carry?
All of our aftermarket Denison parts carry a 2-year no-hassle replacement warranty, with in-stock items shipping same or next business day.