1967 Case 730 Comfort King

crankin12864 · Jul 1, 2020

Auxiliary Remotes only have 300psi of pressure, should be betwween 1200-1500 psi.
3 pt. hitch has plenty of lifting power so I would assume hydraulic pump is good.
What would cause the power loss in the Auxiliary remote circuit?

mEl · Jul 1, 2020

(reply to post at 10:17:25 07/01/20)

Did you check all 4 outlets? the right side couplers have thermal reliefs which can fail under certain abusive circumstances. this will cause low pressure and implement leakdown. Other than that, the couplers and hitch work off of the same relief valve and share a common pressure setting so even if the hitch seems to go up normally it would not lift an implement of any weight.

crankin12864 · Jul 1, 2020

I have a Drum mower on the 3pt right now and it lifts it without any problems - It weighs 1,000 lbs.

I have tried the upper remotes, 300 psi on both of them. Gonna try lower remotes today and check the pressure on them.
I suspect the pump is good because I seem to have decent flow, just not much pressure.

DKase · Jul 1, 2020

I have seen the gaskets on the valve "heads" blown out.

Mike Fitz · Jul 1, 2020

Do you have your hoses hooked up correctly? top right and top left or bottom right and bottom left, a common mistake with CASE tractors, ask me how I know this.
Mike

crankin12864 · Jul 1, 2020

Yes,

I made that mistake initially but I corrected after looking at the service manual.

crankin12864 · Jul 1, 2020

I have no external leaks. Dry as a bone.

DKase · Jul 2, 2020

Blown head gasket could be returning the oil to the sump. I have had it happen on the 870. It is almost the same valve.

crankin12864 · Jul 3, 2020

I am convinced that I am going to have to tear down the Auxiliary Control Valve and see what's wrong.

It is probably the thermals that are causing the problem. Just was hoping it was going to be something simple.

mEl · Jul 4, 2020

If all for remotes check 300 lbs, the thermals are NOT the problem, they can only affect the RH two remotes, they are not in the LH side caps. If the thermals are bad the remote cylinder plugged into a failed thermal remote will raise normally and go back down after the lever is returned to neutral. If the pump is good the main relief has probably blown an oring at the top of the sleeve. I have worked on these tractors since they came out at an authorized Case dealership and know the flows involved as I stated before, if the remotes are showing 300 lbs that IS system pressure, unless it has been cobbed up somehow the hitch IS working at the same pressure as the remotes. Don't go down a bunch of bunny trails!!!!!!! I told you this in a previous post , this is what is frustrating about giving info out, you do not know me from Adam and have no clue about my or no others qualifications on here, I get that but I do know those tractors!!

crankin12864 · Jul 4, 2020

Thanks for the info.

I hope it is just an o-ring.

1967 Case 730 Comfort King

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