1175 Case hyd. pressure

[Jim Basler]

Does anyone out there know if I can adjust the hyd pressure on my Case 1175 tractor.

 

[Anonymous-0]

Jim,
Plug a 4000 psi gauge in the remote outlet,it should be 2050 to 2250 psi.at 2000 rpm.You should flow test the 16 gal.pump before adjusting the relief valve. You can adjust the pressure by removing the remote valve and installing shims in plug that holds the relief in. It could be a blown o-ring in the relief valve.

Marlin

 

[MDMO]

While talking about 1175's what causes air in the hydraulic and transmission oil as soon as you start the tractor? Hydraulics work good and solid but slow.

 

[DKase]

Leak in the suction line to the pump. Pump is sucking air and trying to create pressure with air in the oil. The system will act spongey because air does not have positive displacement. If you place the pressure gauge in the remote coupler it will take about 3 seconds to come up to pressure and flow will be lousy. If you place a hose with one male coupler in a remote coupler and leave the other end of the hose open so you can direct the flow into the filler opening take note of how much air is in the flow just as the engine is started. If the air is present just as soon as the pump starts the problem is most likely the O-ring on the suction line right behind the pump. If it takes several minutes to build up it is much harder to find.

 

[MDMO]

it is instant and I think they just replaced the pump before I got it. Thanks I will look there first as I was not looking forward to pulling the PTO housing off just yet

 

[mEl]

If the pump has been replaced there is a good chance that the oring in the casting was cut upon installation. I would remove the pump and inspect the oring in the tractor casting for damage. I would replace both the rings, one in the pump and the casting oring. In addition I would take the feed tube and carefully grind a bevel on it where it enters the casting oring, both ends for that matter, I would then wire brush it and polish it so it will enter the oring without damaging it. Apply a little grease to the oring and feed tube, put the pump in place and gently rock it and it will slip easily into place. I do every tube in the manner described when replacing pumps. mEl