Model Identification

Model Identification

If you are unsure of your Cat Pump model number, there are two ways to identify. The easiest is to identify the Cat Pumps model number tag. There are three different style labels shown below:

If your pump does not have a model number label, you must measure either the cylinder (piston pump) or the ceramic plunger (plunger pump), which are highlighted in the illustration below. The serial number which is clearly stamped into the lower side of the crankcase above the mounting flange is not intended for pump identification. These serial numbers can assist you in determining “Effective Dates” for changes in pump construction, performance, or design which are highlighted in the Technical Bulletins.

Piston Pump Plunger Pump

Remove pump discharge manifold to access cylinders.

 Remove pump manifold to access plungers.


Measure the inner diameter, outer diameter and length of the cylinder as shown below:

Measure the length and width of the plunger as shown below:

 Identify the stroke of the crankshaft. The stroke is printed on the end of the crankshaft.

Identify the stroke of the crankshaft. The stroke is printed on the end of the crankshaft for both hollow shaft and standard models. If you have a hollow shaft pump, you will need to remove the pump from the engine/motor.

If you are still unable to identify your piston or plunger pump, please contact us today on 01252622031 or email Tip: If you can email us and provide pictures of your pump, the pumps flow and pressure, this would be really helpful.


1 Fleet Business Park
Sandy Lane
Church Crookham
FLEET, Hampshire
GU52 8BF

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