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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Bobcat 753, with Hydro Pump Problem

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09-30-2013 04:16:50

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Wayne and Stickwelding,

Thanks for the replies. Armed with this info I am going to ask the customer a few more questions. Specifically, I am going to ask about the oil level, and why he thinks the valve body is not 100%.

He did say that he was using the machine and lowered the boom, or bucket, and the pedal stuck. He gave the pedal a kick to free it up and then there was no boom/bucket control. Maybe there is nothing wrong with his pump at all and only his valve body is to blame?

I need to call him and discuss some more details.

Thanks again,

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09-30-2013 18:53:18

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 Re: Bobcat 753, with Hydro Pump Problem in reply to thynes, 09-30-2013 04:16:50  
If he was lowering the boom and the peddle stuck he may have put the spool into the dentented, float, position. If he doesn't use that position very often it might have stuck in that position. I had one awhile back where that happened to a customer and he had absolutely no control of the boom with that peddle. I had to use a pry bar to get the spool untsuck, and then pull the detent mechanism and clean/free it up for him so it didn't happen again. That said if he kicked the peddle too hard he may have also broken, or bent, a part of the linkage causing the funtion not to work.

In any case, based on what your saying happened, I think the guy made an assumption on the problem and then began taking things apart without every doing any real troubleshooting (nothing uncommon in my experience). That being the case, I'd say the probility of the pump actually being bad are really slim. Good luck and hope it turn out to be a good machine if you wind up buying it.

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Stick welding

09-30-2013 21:55:32

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 Re: Bobcat 753, with Hydro Pump Problem in reply to NCWayne, 09-30-2013 18:53:18  
I agree he could have kicked into float position. I would hazard a guess that over 50% of skid steer owners don't have a clue their machine has a float position and what it's used for. The other thing the poster said is the bucket didn't work either which would indicate another problem. Float would affect the lift arms but not the bucket.

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10-01-2013 21:36:07

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 Re: Bobcat 753, with Hydro Pump Problem in reply to Stick welding, 09-30-2013 21:55:32  
I had that thought in mind too, but the way he stated it was kind of ambiguious as to wether he had no boom or bucket control. I say this because he said the guy was lowering the boom or bucket, and then the peddle (singular) was stuck. Saying he was lowering (loader arms), and using the word peddle -vs- peddles lead me to believe the problem was related only to the loader arms and not the bucket roll. But I could be wrong........

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Stick welding

09-30-2013 22:12:09

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 Re: Bobcat 753, with Hydro Pump Problem in reply to Stick welding, 09-30-2013 21:55:32  
Just thought of something else. If the aux. pedal was pushed forward and locked in would cause the hyd's. not to work. It would also make it labor when trying to start and heat the oil pretty good. It's easy to do and not something you'd think about, especially if you never used the aux. hyd's.

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10-02-2013 07:49:00

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 Re: Bobcat 753, with Hydro Pump Problem in reply to Stick welding, 09-30-2013 22:12:09  
I agree. My buddy experienced that problem with a rental machine awhile back. Granted the machine was a Case, not a Bobcat, but when the aux controls stuck in the ON position everything else stopped working, and it was nearly impossible for them to get it started to figure out what had happened. Never did hear what the actual cause of the problem was, since all he did was call the rental company to come get it, but that is definately another option.

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