Denison Pump Model Code Decoder: T7 Vane and Gold Cup

Denison vane pumps carry a long model code that looks impenetrable until you know where the field boundaries fall. Every group means something specific, and two of them decide which seal kit and which cartridge you need. This page decodes the T7 series field by field, then covers the Gold Cup piston range.

T7D - B42 - 1 R 00 - A 1 M0
Field Meaning Matters for parts?
T7D Series and mounting flange Yes
B42 Cam ring, which sets volumetric displacement Yes, this is the cartridge
1 Shaft type Yes
R Direction of rotation Yes
00 Porting combination, 00 is standard Sometimes
A Design letter Yes, revision level
1 Seal class Yes, this picks your seal kit
M0 Mounting and connection variables Sometimes

Series and mounting flange

Series Mounting Parts
T7B ISO 3019-2, 100 A2 HW, 2 bolts T7B parts
T7BS SAE B, 2 bolts, J744c T7B parts
T7D ISO 3019-2, 125 A2 HW, 2 bolts T7D parts
T7DS SAE C, 2 bolts, J744c T7D parts
T7DD ISO 3019-2, 125 B4 HW, 4 bolts. Double pump, two cam rings T7DD parts
T7DDS SAE C, 6 bolts, J744. Double pump T7DD parts
T7E ISO 3019-2, 125 A2 HW, 2 bolts T7E parts
T7ES SAE C, 2 bolts, J744 T7E parts
T7EE ISO 3019-2, 250 B4 HW. Double pump T7EE parts
T7EES SAE E, 4 bolts, J744. Double pump T7EE parts

A letter may be appended to the series to indicate special parts within that series.

Cam ring codes and displacement

This is the field that determines your cartridge kit. The code maps directly to volumetric displacement in milliliters per revolution.

Series Code ml/rev Code ml/rev Code ml/rev Code ml/rev Code ml/rev
T7B / T7BS B02 5.8 B03 9.8 B04 12.8 B05 15.9 B06 19.8
B07 22.5 B08 24.9 B10 31.8 B12 41.0 B15 50.0
T7D / T7DS
T7DD / T7DDS		 B14 43.2 B17 54.0 B20 64.8 B22 70.3 B24 79.6
B28 88.4 B31 97.4 B35 111.4
T7E / T7ES
T7EE / T7EES		 042 132.3 045 142.4 050 158.5 052 164.8 054 171.0
057 183.3 062 196.7

On a double pump such as T7DD or T7EE you will see two cam ring codes, one for P1 and one for P2, and they are frequently different. Both must be quoted, in order, when ordering cartridge parts.

Shaft type

Series Code Shaft
T7B and T7BS 2 Keyed, ISO R775
T7BS only 1 / 3 / 4 Keyed SAE B / splined 16-32 SAE B / splined SAE BB
T7DS only 1 / 2 / 3 / 4 Keyed SAE C / keyed non-SAE / splined 12-24 SAE C / splined non-SAE
T7D and T7DS 5 Keyed, ISO 3019-2, G32M
T7DDS only 1 / 2 / 3 / 4 Keyed SAE C / keyed SAE CC / splined 12-24 SAE C / splined 16-32 SAE BB
T7ES only 1 / 2 / 3 / 4 Keyed SAE CC / keyed non-SAE / splined 12-24 SAE C / splined 12-24 SAE CC
T7E and T7ES 5 Keyed, ISO R775, G38M
T7EE 2 Keyed G45N, ISO 3019-2
T7EES 1 / 3 / 4 / 5 Keyed SAE CC / splined SAE CC / splined SAE D and E / keyed SAE D and E

Rotation, porting, design letter and seal class

Field Code Meaning
Direction of rotation R Clockwise, viewed from the shaft end
L Counter-clockwise
Porting combination 00 Standard
Design letter A, B and so on Revision level. Quote it, since internals changed between revisions.
Seal class 1 S1, Buna-N. The standard kit.
4 S4, EPDM. For phosphate ester and water glycol fluids.
5 S5, Viton. For high temperature and aggressive fluids.

The seal class digit is the one people miss. A pump running phosphate ester with a Buna-N kit fitted will fail quickly, and the two kits look almost identical in the box. If your code ends in a 4 or a 5, say so when you order. Browse Denison seal kits.

Gold Cup piston pumps: the frame number is the displacement

The Gold Cup range uses a much simpler convention. The number after the P is, near enough, the maximum displacement in cubic inches per revolution.

Frame Max displacement in³/rev cm³/rev Continuous pressure Max speed at full stroke Parts
P6 6.00 98.3 5000 psi / 350 bar 3000 rpm P6 P7 P8 parts
P7 7.25 118.8 5000 psi / 350 bar 3000 rpm
P8 8.00 131.1 5000 psi / 350 bar 2700 rpm
P11 11.00 180.3 5000 psi / 350 bar 2400 rpm P11 P14 parts
P14 14.00 229.5 5000 psi / 350 bar 2400 rpm
P24 24.60 403.2 5000 psi / 350 bar 2100 rpm P24 P30 parts
P30 30.60 501.5 5000 psi / 350 bar 1800 rpm

So a P14 is a 14 cubic inch per revolution frame. Intermittent ratings run to 6000 psi on the P6, P7, P11 and P14, 5000 psi on the P8, and 5500 psi on the P24 and P30.

Does Parker branding change the code?

No. Parker Hannifin acquired Denison, and current bulletins are published under Parker part numbers such as HY29-0074, but the Denison model code convention is unchanged. A pump badged Parker Denison decodes exactly as above. See also our Parker pump identification guide.

Denison parts by series

Send us the full code and we will quote the parts

Give us every field, including the design letter and seal class. Those two decide what actually fits. Over 40,000 part numbers in stock with roughly 55,000 more we can source to order, and most quotes go out the same business day.

Request a quote · (810) 882-1171 · info@restopower.com

Frequently asked questions

How do I read a Denison pump model code?

Take a code such as T7D-B42-1R00-A1M0 and split it into fields: series and mounting flange, cam ring displacement, shaft type, rotation, porting, design letter, seal class, then mounting and connection variables. The cam ring code and the seal class are the two fields that most often determine which parts you need.

What does the B number mean on a Denison vane pump?

It is the cam ring code, and it sets volumetric displacement in milliliters per revolution. On a T7D, for example, B14 is 43.2 ml/rev and B35 is 111.4 ml/rev. It identifies your cartridge.

What is the difference between T7D and T7DS?

The mounting flange. T7D uses an ISO 3019-2 125 A2 HW two-bolt flange, T7DS uses an SAE C two-bolt flange to J744c. The hydraulic internals share the same cam ring codes.

What displacement is a Denison P14 Gold Cup?

14.00 cubic inches per revolution, or 229.5 cm3, rated 5000 psi continuous with a maximum speed of 2400 rpm at full stroke. On the Gold Cup range the frame number is the displacement.

Which seal kit does my Denison pump take?

The seal class digit decides it: 1 is S1 Buna-N, 4 is S4 EPDM for phosphate ester and water glycol, and 5 is S5 Viton for high temperature or aggressive fluids. Fitting the wrong material will fail quickly.

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