Dayton hydraulic gear pump RPM?

RalphWD45

Well-known Member
I removed the hydraulic pump, from my 335 MM utility, that runs the loader. I intend to transport it to a rebuilder in the morning, along with the 2 spool gresen control valve, that is letting the bucket to free fall. Looking on the computer, for a simular pump, so I could find out the GPM of my present pump, I noticed that the pumps were rated with max GPM at 1800 RPM. That makes me wonder if my pump is OK, but not being turned fast enough, by the belt pulley shaft! Does the PTO, and the belt pulley both turn at 540 max? If so then I need a way to turn the pump faster. My present pump is a Dayton model 6z005, and I havent been able to get the spec's from this puter. Any one know how fast a 335 minnie's belt pulley shaft turns?
 
Hello There. First of all a good RPM for the average gear pump is about 1300 to 2000 RPM Next what model Greesen valve do you have (get me a casting number)? I don't think your problem is in the valve. You can test that on your own with a pressure gauge.
 
Belt pulleys are usually rated in ft/min on the belt, so RPM is dependant on pulley diameter. Usually, belt pulleys run 800-1300 RPM at rated speed, dependant on pulley size.
 
Thanks for offering to help J! By the time I saw your post, I no longer have the control valve ,to find the casting number. I droppedit off at the rebuilder in Milton, along with the Dayton pump, they are going to call me when they find out what they both need, then we will decide wheather to rebuild them, or replace them. The tec,I talked to said that the relief valve in the Gresen, takes a beating, over the years, and is probably what needs fixed. He told me that seals in the pump ends, rupture, and let fluid bypass, and may be the pumps problem. I am not sure when they will get to them, but should know more in a day or two.
 

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