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Author Topic: finn pump  (Read 9008 times)

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Offline larry4@comcast.

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finn pump
« on: Wed April 02, 2008, 08:36:17 AM »
hi i have a t60 finn we cannot adjust  the empeller to wear plate anymore (its pushed tothe max ) do we need a new empeller & wear plate ? & if so were can w get oe other than finn at a reasonable price

Offline hydroservice

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finn pump
« Reply #1 on: Wed April 02, 2008, 07:45:51 PM »
When you say wear plate do you mean the pump cover or do you have an older machine where there was a wear plate. When you adjust your pump tolerance do you do it with shims or the 4 bolts on the outside cover?  It makes a difference what you might need.  If I knew the serial # that would tell me alot.
Erosion Control Equipment & Products Since 1947
                     Pittsfield, Maine
                        FINN T-330

Offline muddstopper

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finn pump
« Reply #2 on: Sun April 06, 2008, 10:01:50 AM »
Larry, Finn used several different pumps on the T60 hydroseeder. Mine was so old they didnt even have parts for it. What I did was I took the pump apart and placed the faceplate in my lathe. I turned the faceplate down until the surface was flat. I then turned down the flange (where its bolted together) on the faceplate to correct the clearance between the impeller and the resurfaced faceplate. My pump now has excellent pressure and the fix was about $4000 cheaper than the pump conversion kit that Finn sells to convert my old machine to something similar to their new T60. The castiron housings on the old finn pumps is pretty hefty and can stand the resurfaceing, You can also turndown the center portion of the housing on both sides to gain back the adjustability of the impeller/flaceplate clearances. It takes someone with a pretty big lathe in order to turn down the center portion of the pump housing. My lathe is a 14inch Monarch and the center section was still to big to clear the lathe bed. Your pump might or might not be similar to what mine is so I dont know if this procedure will work for you.
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Offline larry

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finn pump
« Reply #3 on: Mon April 07, 2008, 03:04:58 PM »
Hi again sorry for the delay in responding but i just got membership my modle # seeder is RUA-1018 i dont know if its got a old pump or newer pump fimm gave me a quote for 208 impeller & 293 wear plate now my ? is what wears n these parts is it the plate or empeller ?& u said that u turned down the wear plate flat is that the way its supposed to be ? cause mine is kinda tapered funny i also have a monark lathe

Offline hydroservice

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finn pump
« Reply #4 on: Mon April 07, 2008, 05:21:37 PM »
You have the newer type of pump. When you have no adjustment left it is recommended that you change both the impeller and suction cover. If you replace one or the other you will gain back some adjustment but obviously not as much as changing both. If you machine the suction cover back to being flat and true and replace just the impeller you will gain some adjustment but it also depends how much you have to take off your existing suction cover. Without seeing your impeller you may be better off to replace the suction cover first and see what things are like. The suction cover is what usually wears the most first. Depending how much you use your machine and it is not recommended but I have had a couple people put brass shims on the shaft behind the impeller bringing it out towards the suction cover. If you are only talking a few thousands it might work again its not recommended.
Erosion Control Equipment & Products Since 1947
                     Pittsfield, Maine
                        FINN T-330

Offline muddstopper

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finn pump
« Reply #5 on: Mon April 07, 2008, 08:16:19 PM »
I can tell you from experience that if you start adding shims behind the impeller, you will create a gap between the impeller and the the area around the shaft seal. this gap will fill with mulch and whatever else you run thru the pump and eventually the seal will fail. Been there done that. I havent had any of the newer pumps apart, but they look similar to the older pumps, just not as big. My pump has a 9-10? inch impeller while I think the newer pumps are only around 6 or 7 inches. Not positive on the sizes but hydroservice can correct me if I am wrong. Anyways, my pump is about 23 years old and the impeller still looked pretty good. What I call the faceplate is the same thing that hydroservice is calling the suction cover. This is where the slurry enters the pump and is what the impeller works against. If yours is looking tapered, its because of the wear and tear of slurry rubbing against it while the machine is pumping. Since you own a lathe, I would try machineing the suction cover down flat, but you will also have to machine the  bolt flange down to make up for whatever material you take off the flat portion of the plate. Otherwise, you wont be able to get the proper clearances between the impeller and faceplate, with a resulting loss of pumping ability. I took about .040 off the face of my cover because thats what it took to make it flat, and an equal amount off the bolt flange. I could have taken more off the bolt flange and regained some adjustability, but I intended to also turn down the center section. I had already taken the suction cover out of the lathe before I discovered that the center section wouldnt clear my lathe bed. I just didnt feel like taking the time to get the suction cover trued back up in the lathe again so i could turn it down some more. I figure If I have more problems later on that I can always take the center section to a friend with a bigger lathe and turn it down to regain adjustability. It lasted 23years before this rebuild and I will probably buy or build a new machine before it needs to be redone again.
"To provide knowledge, service and help without bias to those with an interest in our industry"

Offline hydroservice

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finn pump
« Reply #6 on: Mon April 07, 2008, 08:58:08 PM »
I agree completley with mudstopper and the reasons for not putting shims behind the impeller. Only mentioned it because I have had to customers do it and they are still running the machines. Probably the exception to the rule or just lucky. If your time isn't worth anything all the lathe work can be done but if it was me I would just buy a new suction cover. Old one is off new one is on in less than 1 hr. Lathe work ???
Erosion Control Equipment & Products Since 1947
                     Pittsfield, Maine
                        FINN T-330

Offline larry

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finn pump
« Reply #7 on: Mon April 07, 2008, 09:24:27 PM »
thanks for all the ideas i will take the pump cover off & do some mesurements does anyone know who makes the pump that finn uses ? thanks again Bill for the phone call
Larry

Offline hydroservice

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finn pump
« Reply #8 on: Tue April 08, 2008, 10:01:24 AM »
You will have a hard time finding out who makes the pumps for finn as they are sort of proprietary. Not sure who you got your prices from but my pricelist shows them being less than you posted. $191.88, & $269.70 is what I have plus freight of course.
Erosion Control Equipment & Products Since 1947
                     Pittsfield, Maine
                        FINN T-330

 

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