Let's Talk HY Hydraulic Pumps

[Mike'sHorseBarn 3,133]

I have an HY 2 pump on my 753 that I put two new oil seals on the input shaft and it still leaks pretty bad. I know the hole is worn, so my question is, what fixes are out there for this? There has to be something. I'm working on a Hein Werner pump off a cub cadet right now and I ordered a rebuild kit from lowell to fix it up, but it has the same issue as my 753 and I don't want to put a leaky pump back on. Any thoughts on this?

[Achto 28,794]

1 hour ago, Mike'sHorseBarn said:

I know the hole is worn

 

Are you talking about the hole that the shaft comes through? You could drill the hole out bigger then bush it back down to the shaft size. If it is the hole that the seal drives into, you could look for a slightly bigger o.d. seal then machine the hole for the seal to size.

[Mike'sHorseBarn 3,133]

15 minutes ago, Achto said:

 

Are you talking about the hole that the shaft comes through? You could drill the hole out bigger then bush it back down to the shaft size.

 

Yea that's what I'm talking about. I wonder if anyone here has ever done that?

 

[Achto 28,794]

This might be a good question for @wheelhorseman

[oliver2-44 10,370]

Show us a picture of the parts and mark where you suspect it is leaking.  Some possible options, as I understand the problem. 

If the "hole" that the seal seats in is worn or pitted you could possible use some "gap filling" locktite in the seal groove to get a seal.  If it has pitting you could fill the pits with JB weld and carefully sand it smooth.  Both the locktite and JB weld repairs would require the part be oil free.

[squonk 42,567]

I have "almost" the same problem on my 953. When I got it home from the big show it really didn't leak much but the belt was shot. I took off the belt and in the time it was off a big puddle on the frame near where the belt goes formed. I sent the pump and cylinder out to a hydraulic shop near me to get fixed. Of course they still leak 

 

I have tried to find the exact spot where the oil is coming from but can't really tell.

[Mike'sHorseBarn 3,133]

I'm adding a pic of the cub cadet pump. It's leaking out of the shaft in the pic big time and the hole itself around the shaft is worn.

 

[WHX?? 50,752]

Well herein lies your first mistake Mike... working on CC stuff.... paint it red you'll have better luck! 

Seriously yah give Lowell a jingle he might be able to offer some suggestions. He fessed up once he hoards these things. 

Shaft size should be .500, od of seal  .625 or 5/8 but some might have been .75 on the od. History loses us.

Lowell says ther is enough room to stack two seals in ther?

If the hole inside of the input shaft is worn enough the hole will have to be rebushed. Just like on a rear end wear a worn axle needle will make a new seal fail in short time. Over tension on the drive belt wears the shaft bore. They should have used replacable  bearings and I need not welcome you of all guys Mike to old skool....

[Mike'sHorseBarn 3,133]

2 hours ago, WHX24 said:

Well herein lies your first mistake Mike... working on CC stuff.... paint it red you'll have better luck!

They should have used replacable  bearings and I need not welcome you of all guys Mike to old skool....

 

To your first point I absolutely agree! I bought this 104 cub from a coworker just because it had lots of options on it, but needs some work. Needs a drive shaft and clutch and bearings around the transmission input shaft. Let me just say that Cubs are NOT as nice to work on as horses by any stretch lol. To your second point yes they should have used bearings. I read somewhere on the internet that they used needle bearings in these pumps on economy tractors.