wanting to order a new hyd. gear pump from Surplus Center, and wonder how you determine the rotation. For a clockwise pump, are you looking at it facing the shaft end, or are you looking at it from the pump body end? It seems to change depending on how you are holding it.
- Thread starter RalphWD45
- Start date
Anonymous-0
Well-known Member
You talking gear pumps? Is this going to be a pump driven off the front of the crankshaft? Hold the pump with the shaft facing you. Now have the belly of the pump down. Is the suction port on the right or the left? If the suction port is on the left side you have a clockwise rotation pump, if the suction port is on the right side you have a counterclockwise rotating pump. Remember all pumps are rated on theoretical displacement and will ump less than what they are rated at. What RPM do you intend to run the pump. Clear as mud? J>
Janicholson
Well-known Member
A gear pump pumps when the gears turn so that the meshed area of the gears moves opposite of the oil flow.
If you can see, or imagine) the teeth coming toward you where they mesh, the oil flows away from you. The rotation direction depends on which shaft is driven wrom which end, and in which direction.
The volume of the area between the teeth carries oil in that direction and the meshing squeezes it out into the exhaust/pressure port. Jim
If you can see, or imagine) the teeth coming toward you where they mesh, the oil flows away from you. The rotation direction depends on which shaft is driven wrom which end, and in which direction.
The volume of the area between the teeth carries oil in that direction and the meshing squeezes it out into the exhaust/pressure port. Jim
J! the gear pump I am replacing, is coupled to my 335 moline belt pulley shaft, and runs the FEL. I am guessing that it will turn at 540 RPM the same as the PTO. When I hold the pump with the Dayton face plate facing me, I see a arrow, showing the rotation, and it is CCW. When I hold it with the shaft end facing me it is pointing CW. I have to choose which rotation to order, to get the right pump. what is the correct rotation on the old pump?
Surplus Center typically has GREAT customer/tech inquiry service. Give "em a call, just to be SURE you are "on the same page" when determining rotation!
Also, I am NOT a 335 guru, but I"d be REAL surprised if the belt pulley turns the same RPM"s as a 540 RPM PTO.
Might want to ask on the Moline Forum, or borrow a photo tach.
Also, I am NOT a 335 guru, but I"d be REAL surprised if the belt pulley turns the same RPM"s as a 540 RPM PTO.
Might want to ask on the Moline Forum, or borrow a photo tach.
I think I will do that Bob. Being as I couldn't get a straight answer to my question, instead pump theory, and mechanical aspects, which I could care less about. My old pump was returned to me this morning apart and in a box, as unfixable by the hydraulic repair shop. I brought the parts in to the computer room, and tried to see which side the suction port was on, and both sides of the body would take either end plate, and the gasket markings were the same, whichever end I looked at. no help!
Anonymous-0
Well-known Member
You have a phone number or an e-mail, I will sent you some information. Since your old pump is apart you could measure it up to pick a replacement pump. There is a formula for that.
You're over-thinking this, Ralph. Go out and start the Moline, engage the belt pulley, and see which way the shaft turns. It will be either clockwise or CC as it connects to the pump, and that's your answer.
As to the speed of the belt pulley, I think its standard among tractors, but probably slower than 540- if you do a new thread with "belt pulley RPM" as the title, I'll bet you get an oldtimer with the answer in about 2 shakes.
As to the speed of the belt pulley, I think its standard among tractors, but probably slower than 540- if you do a new thread with "belt pulley RPM" as the title, I'll bet you get an oldtimer with the answer in about 2 shakes.
Anonymous-0
Well-known Member
Your pump better turn faster that 540. A lot of them were rated at 1200 RPM. That is why all pumps have a speed where they run at good efficiency, Too slow is just as bad as too fast. It is all based on cubic inches of oil per minute. Then that is converted into gallons per minute. Yes it does make a difference which way you hold it. Shaft toward you, the belly (where the idler gear is ) down and then on which side the suction port is.
Thanks guys! I called Surplus Center this morning, as Bob sugested, and they told me to view the rotation from the end, with the shaft facing me. and also sugested , as Mike M said, that I start the tractor and view the actual belt pulley rotation, and use the oppisite rotation pump. In other words, if the pulley apears to be turning cw, then use a ccw pump.
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