706 depression : ( Weak HYD)

6 years 8 months ago - 6 years 8 months ago #3526 by KY PLOW
i finally got time to put the loader on my 706 this morning only to be disapointed. <!-- s:cry: -->http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_cry.gif" alt=":cry:" title="crying or very sad" /><!-- s:cry: --> the hyd pump is so weak, it will only raise the loader about 6" off the ground. <!-- s:shock: --><img src="http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_eek.gif" alt=":shock:" title="shocked" /><!-- s:shock: --> not sure yet wether it's a pump issue, or a valve body issue. i replaced hyd oil filter, and drained oil and replaced $$$$$$$$ didn't make a bit of difference. <!-- s:evil: --><img src="http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_evil.gif" alt=":evil:" title="evil or very mad" /><!-- s:evil: --> <!-- s:evil: --><img src="http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_evil.gif" alt=":evil:" title="evil or very mad<!-- s:evil: --> any ih guys have any sugguestions???..........matt

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6 years 8 months ago - 6 years 8 months ago #1933 by shea
matt there was an add over on ytmag about a 706 having pump problems and i think the work around was over filling the hyd oil 5 gal because it would cover a leaking o-ring.

i dont know if this will help but here it is.



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6 years 8 months ago - 6 years 8 months ago #1936 by KY PLOW
thanks johnny,

i tried that with no success......old ih fella down the driveway is gonna help me pin point the problem.

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6 years 8 months ago - 6 years 8 months ago #1944 by KY PLOW
finally got up the nerve to pull the hyd hitch pump off the 706 to see what i could find, after being told time and time again i need a new pump. and to my amazement "looky looky what i found!!! <!-- s:lol: -->http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_lol.gif" alt=":lol:" title="laughing<!-- s:lol: --> "



yep looks like a missing o-ring in that small port doesn't it. with some help from a friend over on yt mag, we determined that without that oring in place, it was allowing my oil to go in circles with very little going to valve and lube circuit. the small port best i can gather is for a piggyback pump which i don't have, and that small port is suppost to be blocked off by the cover plate, but with the missing oring, it's just blowing oil back into the resevoir, allowing the main pressure port (much larger and on the other side of pump) to be very low on pressure. if i can get the proper o ring tomorrow, and if i can afford to fill it back up with fresh oil, i should have enough time to give you an update by tomorrow night. i'm exited...hope this works, it's a whole lot cheaper than a re-man or new pump from cnh

looks like that is a port to no where though........makes a 90 and goes right to the back of the pump which has a cover plate and gasket...... <!-- s:? -->http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_confused.gif" alt=":?" title="confused<!-- s:? -->
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6 years 8 months ago - 6 years 8 months ago #1957 by shea
good luck matt,

let us know what happens.

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6 years 8 months ago - 6 years 8 months ago #1975 by KY PLOW
here is an update on the 706. just gonna copy and past what i told the rpm guys. i'm a little disappointed, but good news is unless its the cast busted somewhere, it should just be alot of labor and a little in parts.......

after a short process of elemination, new filters, new orings, and new hitch pump, an old ih mechanic showed up today and ran a pressure test, load test, flow test, and relief test. brand new pump 4gpm, pressure 38psi. after the test he assured me of a serious internal leak, and showed me an easy way to find it. on the rear of the tractor where the top link for 3pt pins to the frame, you can take the two left bolts out of the pto housing that holds the pto lever linkage (3/4) socket, then remove the 6 bolts (15/16 socket) that hold the cast toplink plate on, and see inside majority of the rear housing. started the tractor, pulled remote lever back, and oil blasted from top of housing to the bottom like a water faucet. he told me 9 out of 10 times, that can be done with gasket staying intact to the rear frame, and you can put the cover right back on after you have seen if thats the problem. i wanted to share this because had i known that prior to buying a new pump and a whole lot of hyd oil, i would have more money to fix the actual problem which will require pulling upper half of rearend housing off. he tells me most of the time the problem is as simple as bolts backed out, or an o-ring blown or gone. thanks for your intrest and hope this may help someone down the road.......matt

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6 years 8 months ago - 6 years 8 months ago #1980 by
dang!! i was really pulling for you there. i was hoping you had found the problem with the o-ring. <!-- s:cry: -->http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_cry.gif" alt=":cry:" title="crying or very sad<!-- s:cry: -->

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6 years 8 months ago - 6 years 8 months ago #1987 by KY PLOW
i sure wished it would have been. i thought sure i had found the problem there. as it turns out you only need an o-ring there if you have a piggyback pump installed on the back side (bottom in picture) of the pump. this repair job may not be as bad as it sounds. best i can gather it's just pulling the seat off, and all the bolts that hold the rock arm housing on, and a few lines from the brakes. then use a hoist to pull the housing. bill says the trick is getting it back on because you have to align the draft control lever on the top housing behind the arm "in" the lower housing. to do that i need the draft control to be free because the lever needs to be fully aft, and mine is froze up. i may be able to get it to free up while i have the housing off though. i'll keep you updated, but may take a little while to replenish funds... <!-- s:lol: -->http://www.grandpastractor.com.php53-25.dfw1-2.websitetestlink.com/images/icon_lol.gif" alt=":lol:" title="laughing<!-- s:lol: --> ....matt

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