Determining motor/pump size

[J_J]

Have you decided whether to drive the deck directly, or drive it through the gearbox?

 

[J_J]

According to the formula at Surplus Hydraulics, a 10 GPM pump at 2000 psi, will take 14 HP to run it.

Did the manual state the cu in of the pump/motor?

 

[dodge85rc]

Have you decided whether to drive the deck directly, or drive it through the gearbox?

I would like to go through the gearbox. Then I don't have to worry about trying to match the splines on the pulley to the splines on the motor.

The manual does not state that specification. I will email the company again and see ifthey can provide that.

 

[dodge85rc]

1.180 cu.in

 

[dodge85rc]

bump.

 

[J_J]

1.180 cu.in

Using a pump of 1.2 cu in, GPM at 1000 rpm = 5.2 GPM, HP required 11
-------------------------------- 2000 rpm = 10 -GPM-------------21
-------------------------------- 3000 rpm = 14 -GPM ------------29

A hyd motor, 1.2 cu in, with a hyd input of 14 GPM will turn 2695 rpm and develop 573 in lbs
-------------"""""""""""---------------------10 GPM ---------1925
-------------"""""""""""---------------------5.2 GPM---------1001

 

[dodge85rc]

So will that motor work do you think?

 

[J_J]

So will that motor work do you think?

If in fact it is a hyd motor, with a 1.2 cu in displacement, it will work if you use an engine with about 22 HP. It will work to some degree if you use a smaller engine.

We still don't know if the pump/motor was driven directly off the engine or had the rpm reduced down to a certain rpm just for the pump. Whoever has the manual on that unit would know the answer.

 

[dodge85rc]

That motor is able to be used as a motor. I did confirm it with the manufacturer. I had originally looked at the wrong section of the manual. So ideally, I would want to find a pump that will put out 10-12 gpm?

 

[jenkinsph]

What is wrong with the existing hydraulic motor? Any reason you cant use it as is?

now if it is worn out I would consider crossing over to a Commercial Shearing motor with the similar specs. These are good quality and also available with the end fed hoses.