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tommyg

hydro seals leaking

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tommyg

I'm having a heck of a time keeping my hydro system on my d180 from leaking at the manifold/hydro pump connection. Supposedly, there are two "O" rings that fit in the groove for at least the larger opening. There's a normal one and a "square" one. (cross section). I tried the connection without the "square" one, but it leaked. Then I tried making my own "square" one by carefully sanding down a normal "O" ring and positioning them just as the manual says. Better, but still leaks.

 

My Toro dealer tells me that he doesn't even have these "O" rings on his drawings. Anyone know where I can purchase a set of these? Is there supposed to be a dual "O" ring connection with each of the 4 lines? Why on earth would Wheelhorse even design this system that required stacked "O" rings.

 

It's not leaking a ton. But it's making a mess of the hydropump cooling fins an everything else in the vicinity.

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daveoman1966

Here is a list of the O-rings, apparently still available on-line at Milaca:

I don't know why they engineered it this way...it just is.

 

4-58 971018 O RING $3.95 4-59 103184 RING BACKUP $4.61 4-60 971015 O RING $1.12                                 4-63 971018 O RING $3.95 4-64 103184 RING BACKUP $4.61 4-65 971015 O RING $1.12 4-66 971015 O RING $1.12 4-67 102817 SEAL-MANIFOLD BOLT Call Us    

 

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daveoman1966

A MUST.....the FLAT o-ring sits ATOP the ROUND one.   Fit the ROUND o-ring into the cavity first, not the flat one.  This is true for the PUMP end of the manifold AND for the top of the Hyd MOTOR. 

Also a MUST....  #67 is a copper seal...not rubber.

Lastly, and still a MUST... the MATING METAL faces of the manifold to pump and manifold to motor have to be smooth and clean...no burrs at all, filed smooth.

When connecting the manifold to pump, the alignment of the Back-up rings (flat rings) is critical as they will tend to float around when making the seal. 

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pfrederi

Use of backer O rings in hydraulics is fairly common.  If you have a hydraulic repair place nearby you could see if they have them.  Take the regular O ring with you and they may have the backer ring.

 

#67 the sealing washer is NLA.  You can try a copper crush washer (used in automotive brake systems) and should be available from any auto parts store. 

 

I have also used these

post-1023-0-34314200-1409838553_thumb.jp

Edited by pfrederi
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tommyg

A MUST.....the FLAT o-ring sits ATOP the ROUND one.   Fit the ROUND o-ring into the cavity first, not the flat one.  This is true for the PUMP end of the manifold AND for the top of the Hyd MOTOR. 

Also a MUST....  #67 is a copper seal...not rubber.

 

I'm not sure I have any kind of washer on the top of the bolt. Maybe that's part of my problem. I do have the backer ring on top. Also made some guide bolts to make sure things don't shift when I put it back together. Thanks guys for the links and suppliers. This job take too much time to not get it right and this will be the third time I'm taking it apart!

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tommyg

#67 the sealing washer is NLA.  You can try a copper crush washer (used in automotive brake systems) and should be available from any auto parts store. 

 

I have also used these

 

 

Is that a 1/2" bolt? For some reason I thought it was more like 3/8".  I understand what #63, 64 and 65 is. But what is #66? Is there something that fits between the flanges?

Edited by tommyg

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Geno

Use of backer O rings in hydraulics is fairly common.  If you have a hydraulic repair place nearby you could see if they have them.  Take the regular O ring with you and they may have the backer ring.

 

#67 the sealing washer is NLA.  You can try a copper crush washer (used in automotive brake systems) and should be available from any auto parts store. 

 

I have also used these

 

The Master Carr pic you showed looks like the same seals I use in AC systems for the compressors. 

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Trouty56

I just bid on a set on the bay....NOS...went for a little over 20....had that washer included.....

Edited by Trouty56

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tommyg

I just bid on a set on the bay....NOS...went for a little over 20....had that washer included.....

 

Dang. Never even looked.

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Trouty56

Dang. Never even looked.

Sent you a pm....

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pfrederi

Is that a 1/2" bolt? For some reason I thought it was more like 3/8".  I understand what #63, 64 and 65 is. But what is #66? Is there something that fits between the flanges?

 

 

I had to go look at my D200 to be sure, but the two inner bolts on the rear manifold are 1/2"  The front one needs the sealing washer.

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