756 Power Steering Issues!!

brian756 · Dec 30, 2010

Hi i have a 756 international that has recently started acting up after i put in 2 gallons of hydralic fluid at a tractor supply store. Makes me wonder as it is a traveller brand says its a trans/hydralic fluid, and the color was clear, custom to green which is in it now. Ran it for a couple hours, worked excellent. Put it back in the shed, 4 days later was going to use it and no power steering, shifting into gear there was a delay to engage. loaded seemed to work ok though.
I replaced hydralic filter and cleaned the screen on it. Seems now the shifting is ok, but have no power steering at all. Any input?? Did my power steering pump go bad? thanks

DeltaRed · Dec 31, 2010

steering and shifting,no connection.unless you mean the TA.the ps pump is probally ok.sounds like the multiple control valve is sucking air.bet you blew an o-ring.the ps pump puts out 12gpm,t6he mcv divides the oil flow
;steering,then brakes,then ta ,remainder goes to lubricate the rear end.did you know that those IHtractors use 2 hydro pumps?the hitch pump AND THE PS/MCV pump,they both suck from the same filter.also,dump in 5 more gallons of oil after it reads full(remark the stick),that may help.

9

brian756 · Jan 3, 2011

Ok thanks for the info--not sure why but i put managed to get the tractor in a heated shop for awhile and now everything works! May i ask why add 5 gallons after it reads full?
thanks

mkirsch · Jan 3, 2011

5 gallons over full, in order to cover the pickup tube for the hydraulic pump. There is an O-ring that can sometimes fail and suck air on the pickup tube. An extra 5 gallons will submerge the entire pickup tube with no ill effects.

Owen Aaland · Jan 3, 2011

(quoted from post at 15:06:53 01/03/11) Ok thanks for the info--not sure why but i put managed to get the tractor in a heated shop for awhile and now everything works! May i ask why add 5 gallons after it reads full?
thanks

A very common problem on that type of tractor was a leak that would develop on the suction side of the mcv pump. There is an O-ring type seal between the center section and the rear frame that is above the normal oil level. With age and repeated heating and cooling cycles the seal will lose it's desired shape and when that happens air may be allowed to enter the hydraulic system. When air gets in the system the MCV pump can lose it's prime and you end up having a hard time to get the steering to work. By adding the extra five gallons of fluid the seal ring will be below the oil level so when it leaks it draws oil into the system rather than air.

756 Power Steering Issues!!

brian756

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DeltaRed

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brian756

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mkirsch

Well-known Member

Owen Aaland

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