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Tractor Question
#1378624 Sun Sep 27 2020 02:08 AM
Joined: Jan 2013
Posts: 1,471
A
Shop Shark
Have any of you fellas ever straightened a bent rod on a hydraulic cylinder. Somehow I managed to bend a couple on my Kubota. Kubota wants $900 for each cylinder, and about that just for the rods. A local hydraulic expert will make me a new one for $200, but I found a Harley shop that thinks he can straighten it to 7 thousands tolerance. Anybody got any experience with one of these?


Allen
Yeah, well, that's just like, you know , your opinion, man - The Dude

1948 Chevy 3600 - goal Original restoration, Current Stage 1 - Disassembly and getting body in primer
1954 GMC 3100 goal Hot Rod, Current Stage 1 - Get body in primer
1931 Ford Model A 5 window Coupe - Old Skool Hot Rod
1945 Ford 2N Tractor - Runs great
1964 Ford 2000 Tractor - Use it every week
1974 Stingray Corvette

Re: Tractor Question
Allen Lane #1378643 Sun Sep 27 2020 09:47 AM
Joined: Aug 2001
Posts: 4,401
2
Shop Shark
Over the years of being a Maintenance Machinist, I have straightened hundreds of rods and pump shafts.
If it can be done, depends on the size of the shaft and how bad it is bent.
A press and an indicator is a must have to even try it. I also think that .007 is very doable.
< .003 would not be that hard either, if you know what you are doing.

Look at it this way, you don’t have anything to lose if you try it.

Don


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Re: Tractor Question
Allen Lane #1378645 Sun Sep 27 2020 09:52 AM
Joined: Feb 2001
Posts: 6,860
W
Master Gabster
A youtuber named Johnathon w did it.


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Re: Tractor Question
Allen Lane #1378657 Sun Sep 27 2020 01:25 PM
Joined: Nov 2011
Posts: 2,584
P
Shop Shark
Hey Allen,

Are you talking about front end loader cylinder rods? I have successfully straightened them on an old MF I had years ago. I am not a machinist. A press is essential as well as some real hard wood to keep from scratching/gouging the rod.

Re: Tractor Question
Allen Lane #1378682 Sun Sep 27 2020 04:54 PM
Joined: Nov 2004
Posts: 1,835
J
Workshop Owner
If you decide to have them straightened, make sure who ever does the work knows what they're doing. Otherwise they can make them worse.

Quote
A press and an indicator is a must have to even try it. I also think that .007 is very doable.
< .003 would not be that hard either, if you know what you are doing.

Look at it this way, you don’t have anything to lose if you try it.

I agree. Like Don said, it also depends on how bad they are bent.

Just curious on which Kubota you have, and how you bent them as I also have a Kubota and don't wish to experience the same problem.

John

Last edited by J Lucas; Sun Sep 27 2020 04:57 PM.

J Lucas





1941 Chevy 1/2-Ton
1942 Chevy 1.5-Ton SWB
1959 Chevy Apache 31 Fleetside
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Re: Tractor Question
Paul_WNC #1378731 Mon Sep 28 2020 12:52 AM
Joined: Jan 2013
Posts: 1,471
A
Shop Shark
Paul, yes....the bucket rotate cylinders. I dropped 'em off at the Harley shop, he had all the equipment...we'll see how he makes out.


Allen
Yeah, well, that's just like, you know , your opinion, man - The Dude

1948 Chevy 3600 - goal Original restoration, Current Stage 1 - Disassembly and getting body in primer
1954 GMC 3100 goal Hot Rod, Current Stage 1 - Get body in primer
1931 Ford Model A 5 window Coupe - Old Skool Hot Rod
1945 Ford 2N Tractor - Runs great
1964 Ford 2000 Tractor - Use it every week
1974 Stingray Corvette

Re: Tractor Question
J Lucas #1378732 Mon Sep 28 2020 01:05 AM
Joined: Jan 2013
Posts: 1,471
A
Shop Shark
John, I've got the 3130 HST with a LA513 FEL. I'm not sure how I bent them. I think it was a while ago and the small bends finally wore out the seals which was dumping fluid. These are darn tough machines, I've lifted huge tree trunks, truck cabs, and lot's of dirt, so not sure.


Allen
Yeah, well, that's just like, you know , your opinion, man - The Dude

1948 Chevy 3600 - goal Original restoration, Current Stage 1 - Disassembly and getting body in primer
1954 GMC 3100 goal Hot Rod, Current Stage 1 - Get body in primer
1931 Ford Model A 5 window Coupe - Old Skool Hot Rod
1945 Ford 2N Tractor - Runs great
1964 Ford 2000 Tractor - Use it every week
1974 Stingray Corvette

Re: Tractor Question
Allen Lane #1378743 Mon Sep 28 2020 02:08 AM
Joined: Nov 2004
Posts: 1,835
J
Workshop Owner
I've done the same with mine, lot's of big trees, dirt, road rock, AD and Art Deco cabs engines etc. and so far no problems. I have a B7800 HST 4 cylinder 30 hp with a LA402 FEL, it's a little smaller and lighter duty machine, but like yours it's darn tough.

Hope you get them straightened.

John


J Lucas





1941 Chevy 1/2-Ton
1942 Chevy 1.5-Ton SWB
1959 Chevy Apache 31 Fleetside
1959 Chevy Apache 32 Fleetside
1959 Chevy Viking 40

My Flicker Photos! [flickr.com]

Re: Tractor Question
Allen Lane #1378744 Mon Sep 28 2020 02:12 AM
Joined: Dec 2007
Posts: 1,437
J
jdl Offline
Shop Shark
Ive never personally had them straightened but we'll send them out if the customer wants it, haven't heard any horror stories. Something to think about though if they've bent once and you bend them back straight, it probably won't take as much force to bend them again.


Jordan D. Long

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Re: Tractor Question
Allen Lane #1378762 Mon Sep 28 2020 09:59 AM
Joined: Apr 2005
Posts: 2,612
C
Shop Shark
We have steel V blocks with a layer of brass run over the notches. This seems to help stop the twisting when the ram makes contact. I would think a notch would also help if using wood. For really long shafts that don't fit the press bed we have a puller instead of a pusher ram. There is a hole in the 5' x 10' x 3/4" welding/jig table that the hook on the puller ram can reach through. With V blocks set on the table surface I guess we could handle a 60ft long shaft (width of shop building) with the puller ram set up. It is surprising how much we use the press, table, and ancient huge Monarch flat belt lathe for straightening various parts on the old rides we work on.


Evan
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