reverse pump direction

[sundown57]

Can anyone tell if the direction on a bobcat 720 tandem pump can be reversed and if so How? thanks

 

[Tazza]

It can indeed, you will need to do all 3 pumps, not just the drive pumps.
With the pump open, you will see where the wear plates sit, if you swap them from side to side, the pump will operate in reverse. Note the notches, they must be on the leading edge as the rotating group turns on the plate. When open, you'll see what i mean.
After those two plates are swapped from side to side (flatten them when they are out with wet and dry dand paper and a sheet of glass). you will need to take the vane pump apart, rotate the centre cam ring 180 degrees. There will be an arrow cast into it, you want it to face the direction you want it to go. If it's a gear pump, it's a little more work, but can also be done.
I assume you are wanting to re-power it with a motor that spins in a different direction?

 

[sundown57]

It can indeed, you will need to do all 3 pumps, not just the drive pumps.
With the pump open, you will see where the wear plates sit, if you swap them from side to side, the pump will operate in reverse. Note the notches, they must be on the leading edge as the rotating group turns on the plate. When open, you'll see what i mean.
After those two plates are swapped from side to side (flatten them when they are out with wet and dry dand paper and a sheet of glass). you will need to take the vane pump apart, rotate the centre cam ring 180 degrees. There will be an arrow cast into it, you want it to face the direction you want it to go. If it's a gear pump, it's a little more work, but can also be done.
I assume you are wanting to re-power it with a motor that spins in a different direction?

You are correct. It had a Wisconsin that ran the pumps off the flywheel. Hense CCW standing at the back of the machine. I want to run a Kubota in it and I want to run it off the flywheel. or CW. I spent the whole day today googling these. No idea if I'm right but I think mine are the older cast iron ones that DO NOT make their own charge pressure. If so then they don't care what direction they run in. However I do have to reverse the vein pump to supply charge to them. And I will have to swap the lines going to the drive motors because they will operate backwards. Any idea if that's correct?

 

[Tazza]

You are correct. It had a Wisconsin that ran the pumps off the flywheel. Hense CCW standing at the back of the machine. I want to run a Kubota in it and I want to run it off the flywheel. or CW. I spent the whole day today googling these. No idea if I'm right but I think mine are the older cast iron ones that DO NOT make their own charge pressure. If so then they don't care what direction they run in. However I do have to reverse the vein pump to supply charge to them. And I will have to swap the lines going to the drive motors because they will operate backwards. Any idea if that's correct?

If it's just a vane pump, it should be simple, the newer 741 or 743 rane the same vane pump, easy to reverse rotation.
As for the drive hoses, i don't actually think you need to reverse them. The rotating group just generates the flow, the levers just direct where it goes and how much you get. I think you'll be fine without changing them.

 

[sundown57]

If it's just a vane pump, it should be simple, the newer 741 or 743 rane the same vane pump, easy to reverse rotation.
As for the drive hoses, i don't actually think you need to reverse them. The rotating group just generates the flow, the levers just direct where it goes and how much you get. I think you'll be fine without changing them.

I'm thinking the same thing. I'm beginning to think I'm overthinking all this. Sure would be nice to have a Kubota in it instead of that rattle-trap Wisconsin.