hydraulic problem

jtrichard · Post by **jtrichard** » Sat Nov 05, 2011 11:03 am

2010 dozers do not have an indicator or a return filter only a mesh suction screen 2010 loader has indicator and return filter i own both have had dozer since 69 i was 12

jdemaris · Post by **jdemaris** » Sat Nov 05, 2011 4:58 pm

jtrichard wrote:2010 dozers do not have an indicator or a return filter only a mesh suction screen 2010 loader has indicator and return filter i own both have had dozer since 69 i was 12

That's why I stated there are variations. I've got to be careful to never use the word "all", or for that fact, "never." 2010 crawler with a 805, 806, or 807 dozer does have a restriction indicator. 2010 crawler with an 822 dozer does not.

jtrichard · Post by **jtrichard** » Sat Nov 05, 2011 11:14 pm

most of the 625s and 626s had rear pumps and left side reservors with filters... it looks like some of them may have came off of the center pump as did the 622 mine are both 622s.... 620 is the man. 6way for 2010 not sure of it i would asume that it did not have rear pump ......like the 622 it came off the center pump i would think....ps never use never and always avoid always LOL

captdill · Post by **captdill** » Wed Nov 09, 2011 5:05 pm

I found the problem. Thanks to all for your help and insights. In the process of trouble shooting I was setting up to blow out the input and output lines at the pump. There is a short hose on the inlet side of the pump that bends 90 degrees and transports the fluid from a pipe approximately 1.5 inches wide to the pump. I don’t know if John Deere designed this to be an off-the-shelf radiator hose but that is what was there and it was collapsing under the suction. I noticed when I removed the first clamp that the hose was extremely flaccid. Looking down into it, I though I saw some debris, but that turned out to be the inner wall that had separated and left the rest of the hose so pliable that it was bound to collapse under the least amount of suction. I replaced the hose with another off-the-shelf radiator hose reinforced with metal.

As jdemaris notes “the suction filter is wire-mesh and can be cleaned.” Imagine what happens if it gets very clogged like I described in my case earlier; everything downstream sees extra suction due to the resistance. So, even though that hose had seen some years, it probably wouldn’t have failed as soon as it did if I had known to clean out that “suction filter”. Thanks again to all of you for letting me bounce my problems off of you. I learned a lot about my dozer. Everything is now working great!

Tigerhaze · Post by **Tigerhaze** » Wed Nov 09, 2011 5:15 pm

I am not sure what Deere used as OEM materials for the hoses, but I found a return line for my loader hydraulics (after it blew) that someone before me had replaced with cord-reinforced radiator hose instead of reinforced hydraulic hose which I subsequently replaced it with.

jtrichard · Post by **jtrichard** » Wed Nov 09, 2011 6:59 pm

most off the shelf rad hose WONT put up with oil for very long i would check with mother deere and see what a hose runs so you dont have this happen again out on a job

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