Bobcat 763 Help

   / Bobcat 763 Help #31  
Good luck. :thumbsup:
 
   / Bobcat 763 Help #32  
Sure hope it is a simple hose failure. And yes skid loafers are 10 lbs of crap stuffed in 5 lb package
 
   / Bobcat 763 Help #33  
have you got the hydraulic circuit diagram>
 
   / Bobcat 763 Help
  • Thread Starter
#34  
have you got the hydraulic circuit diagram>

Sort of .......... the dealer gave me an electronic version of the service manual but it has expired so I can't see the entire page any more. I'll just have to chase hydraulic lines and try to find the leak. Problem is, the SS has had a slow leak since I got it and there is oil all over the place, making it hard to see where it's coming from. If I can't find it I may have to try using a pressure sprayer to see if I can clean away some of the oil from inside the cavity.
 
   / Bobcat 763 Help
  • Thread Starter
#35  
I'm pretty sure I found the leak. It may not be the only one but it is definitely a significant one. It is between the pump side of the 45* male x male elbow and the female part of the female x male adapter that screws into the pump housing.

DSCN2684.JPGDSCN2685.JPG

Does anyone know what type fittings these are. I can't get it apart to see for myself. I'll need to run into the city to get some special tools for this and would like to get the right replacement parts while i'm there. Maybe I'll just stop by the Bobcat dealer and get the parts there. They can probably tell me what tool they use to get access to these fittings too.
 
   / Bobcat 763 Help #36  
It is a 45 degree, O-ring face seal fitting: http://blog.worldwidemetric.com/products/an-overview-on-o-ring-face-seal-orfs-fittings/

45-Degree-O-ring-Faced.jpg


The O-ring is bad or overtightened.

Do a search for how to measure the size, or check the Bobcat online parts manual.
 
   / Bobcat 763 Help
  • Thread Starter
#37  
It is a 45 degree, O-ring face seal fitting: http://blog.worldwidemetric.com/products/an-overview-on-o-ring-face-seal-orfs-fittings/

View attachment 543541

The O-ring is bad or overtightened.

Do a search for how to measure the size, or check the Bobcat online parts manual.

Thanks Xfaxman. I didn't know there was an online parts manual. That really helped. Now I can see how it goes together plus I can follow the hydraulic circuitry. The seal must have blown when the pump deadheaded. If I'm lucky that will be the only thing that blew.

After I get this fixed I might take the SS to the dealer and have them perform a flow / pressure / fluid temp check, just to make sure the auxiliary system is operating properly.
 
   / Bobcat 763 Help
  • Thread Starter
#38  
Next problem.

I can't get the above fitting loose. I can get a 1 1/16" open end wrench on the bend but the wrench ends up against some piping and doesn't leave room to turn it. I can't get a wrench or socket on the nut that is screwed into the pump and I can't find a 1 1/4" crow foot wrench anywhere in the local town or the closest city. So I made this, hoping it would do the job.
DSCN2689.JPG
I got the wrench over the nut and the fit was good but even with a 1/2" breaker bar and a box wrench over the end of the breaker bar I couldn't get the nut to break free. I have some WD40 soaking on it now and will give it another go. I'm thinking of using an air impact gun on the end of the wrench I made but I'm not sure if that is a really bad idea because the center of rotation is offset or if it has a chance of working.

Thoughts or experienced advise are welcomed. I certainly don't want to damage this. I can imagine this could really expensive in a hurry.
 
   / Bobcat 763 Help #39  
Hillbilly
I mean this as no insult to your intelligence but are you sure you are turning the nut the correct direction. I know that while standing on your head trying to work things can get mixed up or at least I hope that don稚 happen to just me.
 
   / Bobcat 763 Help
  • Thread Starter
#40  
Hillbilly
I mean this as no insult to your intelligence but are you sure you are turning the nut the correct direction. I know that while standing on your head trying to work things can get mixed up or at least I hope that don稚 happen to just me.

A very good question and no offensive taken. Unless this is a left hand thread, I'm sure I'm trying to turn it the right way, ie. counterclockwise. I managed to get the swivel fitting to turn but for the life of me can't get the bend or the nut (they may be one piece based on the pic that Xfaxman posted) that screws into the pump to budge.

What do you think about trying an impact?
 

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