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easygoin4 
Silver Level
Joined: 14 Sep 2009
Location: Fenton,MI
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 Topic: I40 Backhoe- Leaks Down
Posted: 04 Nov 2010 at 6:21am |
I have an I40 loader/backhoe and was wondering what causes the boom to sag down or drop after few minutes. The bucket and arm slowly lossen up after some time. I know this is not a new machine and know nothing about hydraulics. The front loader will stay up for ever. When I got her I had to replace the seals in the boom cylinder it leaked so bad- and that it fine now.
I was wondering if it could be the levers on the hoe - or that whole valve body thing with the levers that needs redone.
I am sure the seals or rings are not available so I would have to research to find a match. Was thinking of taking it apart for the winter- but not sure what I will get into.
Any advice?
Thanks
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Ron S/IL
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Joined: 12 Sep 2009
Location: Sparta, IL
Points: 140
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Posted: 04 Nov 2010 at 6:27am |
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I would say that the valve body is worn to the point of leaving the oil bypass. I think you could rebuild or have rebuilt. You said you replaced the seals in the cylinder, did you replace the internal seals. It could also be bypassing there. Good luck.
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Ron Stork
Co-Owner Sign Solutions and Promotions.
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easygoin4
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Joined: 14 Sep 2009
Location: Fenton,MI
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Posted: 04 Nov 2010 at 6:34am |
I had the whole cylinder apart- what a learning experience. From what I remember I did piston seals I think you call it, and all the o-rings that were inside. Wanted to do them all so it would last. Seems to have worked- when I got her it poured fluid out near the cyl. rod and now it does not.
I have no leaks on any lines or drips anywhere on this unit.
I am just hoping if I take it apart- I will solve the problem. I do have all the manuals for this unit so that will help on assembly.
Thanks for the input..
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easygoin4
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Joined: 14 Sep 2009
Location: Fenton,MI
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Posted: 04 Nov 2010 at 6:37am |
Does anyone have an idea what it would cost about to send the whole thing for rebuild? It has 2 shorter levers and 4 larger ones. I am not afraid to do it- but if the price is fair- I would send it out. Just did not know if it would be hundreds of dollars or not.
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Ron S/IL
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Location: Sparta, IL
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Posted: 04 Nov 2010 at 10:26am |
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I know a mechanic that does that I will ask him about this and let you know. Ron
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Ron Stork
Co-Owner Sign Solutions and Promotions.
We can custom make signs, decals and any promotional items you may want.
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
Points: 41184
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Posted: 04 Nov 2010 at 5:11pm |
I would say re-do the piston seals and be sure they are good as is the bore , also there is a "0" ring under the piston to seal it to the rod. Check it out by raising the hoe and then removing the hose on the other end of the cylinder , (non pressure side) check it for oil coming ferom pressure side leaking down.
Unsure if it has "V" ring packing or square rings / also if backup ring on piston are not on right side they sometimes leak. Piston leak is probably the cause if it dro[ps fast..
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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pineyjd
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Joined: 12 Sep 2009
Location: Southern NJ
Points: 100
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Posted: 07 Nov 2010 at 1:38am |
My I40 leaks thru control slightly,this lets the boom drop. I rebuilt hyd eqiup back in 60's in factory equip. & it was'nt complicated.
Do you have chains to hold boom up when not using or do you leave boom out/down ?
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easygoin4
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Location: Fenton,MI
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Posted: 08 Nov 2010 at 7:00am |
Yes I do have HD chains. I think I may get into the whole valve or lever assembly this winter. She leaks down probably in about 20-30 min. from full up to the ground.
However the loader will stay up for days..
Thanks for the advice..
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Coke-in-MN
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Posted: 08 Nov 2010 at 7:03am |
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If that is the only valve leaking down, I would check the cylinder closer. Had one hoe where packings were backwards and it leaked down fast.
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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easygoin4
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Posted: 08 Nov 2010 at 7:13am |
Actually outriggers leak down also pretty fast- constantly having to adjust them up.
And I know the bucket does drop too.
That is what lead me to believe the whole vavle assembly needed to be redone.
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Coke-in-MN
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Posted: 08 Nov 2010 at 7:30am |
When I resealed the valve body on my HD4 I just bought the "O" rings instead of the kit, got them through MINNPAR and was cheap way to solve loader problem of dropping.
As they were a standard size , you could just pull one and match it
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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easygoin4
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Joined: 14 Sep 2009
Location: Fenton,MI
Points: 164
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Posted: 08 Nov 2010 at 7:34am |
Exactly what I was thinking. Sounds easy just hope it will be.
I think the biggest problem may be getting the unit off.
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pbqc3803
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Joined: 19 Feb 2010
Location: washington
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Posted: 31 Jan 2019 at 12:57am |
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Chris,
Did you get your valves fixed? Did this help or was it the seals on the cylinders?
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