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Construction Equipment If it digs, pushes, hauls dirt "off road" post it here. |
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Re: Volvo EC300D
Reg , dumb ? , do your valves turn with ease with no pressure ? Could be just a little lapping needed . I have a Robbe valve that is tight like that till I loosen up the top .
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RIP FreddyGearDrive 2-12-59/12-19-11 To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. |
#2
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Re: Volvo EC300D
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Thanks for the help guys! I just recieved some parts for my Tigercat so.... |
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Re: Volvo EC300D
Reg , the Robbe valve is exactly what your doing . I'm thinking you have more pressure then you need . do you have a pressure relief valve in somewhere ? If not , put 1 on the supply circuit after the valve . come out where the plug is ( assuming thats the supply side of your valve ) I haven't got to play with the stuff from Richard yet , but I plan to make a solid base for the valves much like the verio setup . they bring the supply from the pump through the valve into a pressure relief valve of some sort ( needle valve I think ) .
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Re: Volvo EC300D
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Thanks Reg |
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Re: Volvo EC300D
the ports under the rotor are .320" center to center . the rotor is .510" dia the crescents are the same as the ports . I'm going to build a 385cl cat which is as big as vario's 850 deere . I'm not sure these Robbe valves are big enough the ports seem to small for the flow needed ( about 1 mm dia ) I may be making my own .
Stevie
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#6
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Re: Volvo EC300D
Thanks Steve, The valve block that I made is a little larger then but not much. The ports are just under 1/8 and the cresents are 1/8 because that was the smallest cutter I had. I would love to see what the Meinhardt valves look like on the inside that seem to be in a lot of the German machines. Flow was the main reason that my Father inlaw and I designed the valve he made for me so large but I guess the inside of the fittings are so small that maybe it isn't necessary? I use 5/32-10/32 push to connect fittings on the valve and rams. I did drill one out so that the ID of the fitting matched that of the hose and it still looks to be strong so I will drill the rest out and see if it makes a difference in flow or speed.
Thanks again for the help! I'll keep tryin! I have a lot more time and patience than money so I have to figure it out the hard way. |
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Re: Volvo EC300D
Are you able to machine in a teflon shim on the back side of the rotary valve to help reduce friction? The larger you go with these part circular ways in the rotary head, the more force required to rotate it against the thrust created by a larger area in the circular ways. Sort of think that the circular ways or the "pressure in" way (when closed) is sort of a piston, and pressure here will cause the rotary head to thrust against the shoulder in the valve block - make sense?
ha - now Ive read it back I'm not sure it does - clear as mud! Glenn |
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