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Hi,

That is probably a 7.2" dia series motor. As it is a pump motor, it is unidirectional. Hopefully it is correct for your application due to difficulty changing direction of rotation. Also, although unseen in the photos, it likely has an internal spline shaft for the pump. This makes a bitch to couple to a mechanical drive.

Basically I'm guessing it would be rated at 150 to 175 Amps for an hour and 400 to 500 Amps for 1 minute. So a controller needs to handle that. Avoid Kelly. Curtis and Alltrax are good. 36 or 48 Volts would do well. Speeds of 2500 to 3500 RPM in the 7 to 8 HP range. Motor can tolerate higher voltage but do you need it? Staying at 48 V or below keeps associated component costs down.

major
 

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You can easily find controllers from the good companies I mentioned rated for 200 A one hour and 500 A two minute, 36/48 V. Don't use a clutch, especially with a series motor. You have to alter the internal motor wiring (connections) to separate the field and armature (brushes) making it a 4 terminal motor to reverse it.

major
 
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