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Background & Properties
Industry Specifications
Hydraulic Fluids
July 2017
Denison T6H2OC Hybrid Pump Test
Denison's more stringent pump test is known as the T6H2OC. This incorporated both vane and piston pump in a
single housing, thereby replacing the need to run separate T6 and P46 pump tests, as previously required by HF-O.
The test contains both wet and dry hydraulic phases. When testing multigrade oils, this test is known to provide a
high level of shear and is able to effectively discriminate between different types of viscosity modifiers.
Test Criteria
less than or equal to 300 mg piston valve wear
less than or equal to 15 mg vane and pin wear
Denison T-6C Vane Pump Test
This test measures the oil's ability to prevent wear on cam ring, side plate and vanes. It is run for 60 hours at 160°F
and 40 hours at 210°F both at 2400 rpm and 2500 psi.
Test Criteria
Vane Contour Increase
Denison P-46 Piston Pump Test
This evaluates the oil's ability to withstand high pressures and temperatures in piston pumps. This test is the same as
the Denison T-5D Vane Pump Test, except it is performed on a piston pump.
Test Criteria
Piston Shoe Wear Plate, Port Plate Appearance
Denison T5D42
Vane pump test used to evaluate hydraulic fluids for wear in vane pumps.
Denison T6-C
Vane pump test used to evaluate hydraulic fluids for wear in vane pumps.
Denison T6H20C
Hybrid pump test used to evaluate oils for antiwear and working in presence of water contamination, part of HF-O
qualification.
Sundstrand Pump Test
Old test used to evaluate ability of fluid to continue to function in presence of water contamination.
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