White 2-155 Hydraulic Issues

I am helping a friend fix his White 2-155 that lost all hydraulic power, so no power steering, PTO stopped working, and no hydraulic lift. Tractor will start and move in all gears. The hydraulic pump was removed and tested and it was OK, filters, screens, and lines look to be OK as well, fluid level was verified by draining, measuring, and refilling. The 2 exterior suction lines have a lot of bends in them but look to be ok. I talked to a shade tree mechanic and he said there is a pick up tube inside the transmission that has either cracked or fallen out of its correct location. Does this sound correct? What else should we be looking at? Thanks


Jason

Jason

Pull the PTO shaft out back and see of the splines are worn at the tip were it engages the flywheel and were it engages the hydr pump drive gear.
Could be the PTO drive hub at the flywheel stripped the splines as well.

The 2/135 & 155 tractors came out a month after I left. I do know you are not going to pull the PTO shaft out the back as it is a 2 piece shaft. Will the pump pump oil if you unhook the pressure line? Does the pump drive turn?

The easiest way to see if the PTO/hydraulic pump drive shaft is to pressurize the PTO clutches. This will lock up the clutches. If the PTO shaft turns, something in the shaft/shafts going to the flywheel is broke. There are 3 lines on the pto. Standing at the rear of the tractor, pressurize the hole to the right of the 3rd link. Just use a rubber tip blow gun. The top hole is for PTO brake, and the one on the left is for PTO lube. This is the way we determined where the issue was on our 2-155. There are 3 shafts from the flywheel coupled together. It has splines in the flywheel hub, then goes to short shaft. Then it couples to another shaft at the rear of the over/under. Then that shaft couples inside the hydraulic pump drive gear with the shaft from the PTO. Most likely the dry splines in the flywheel is what is worn out. You have no choice but to pull the engine if that is the case. There is charge pump behind the hydraulic pump to feed the filter then the pump. I assume you have no charge pressure either. There is a sensor right below the cab door that you could pull out. As mentioned before, a suction line to the charge pump or from may have come loose. I can't remember, exactly, but there is at least 1 line that bolts to the inside of the transmission case behind the hydraulic filter. Ours, the one bolt was loose on when I had it apart, but could have become an issue. One other thing I learned is that the keyway for the gerotor charge pump wears in the shaft and can eventually shear off when it gets too thin. You'll have to remove the hydraulic pump to check this. White did an update to this for that issue. The suction tube to the charge pump can be accessed by removing the big plug under the trans housing on the left. You will need to drain the rear before removing. The other end of the suction tube is behind the hydaulic pump. Let us know what you find. If you have any questions, email me. Hope this isn't overwhelming. I do have a factory manual if you need pics or something.

You used to work at white? I thought that'd of been cool took at there MM or Oliver factory

To work at there I meant

had a 4-210 with same problem, put in new charge pump, they must wear out.the georotor and everything looked fine,but I tried just the rotor, then the housing,ended up replacing everything. it was pricy,and 10 years ago. just replaced it in my 4-270 last winter, it was 2800, one of the pieces was the last one around

Sorry I worked for a very good dealer from the fall of 1960 till the fall of 76.

Thanks for the information. Going to set up a time with the guy to go out and try a few things.


Jason

Oh okay, if you worked at the factory, I wanted to know what it was like, it would of been cool to assemble these when they where new.

Gerotor pumps very rarely give trouble unless of course the drive key shears or the gerotor brakes. Which will happen on those tractors if you use the pto on something that produces high shock loads. that said I have found that they lose prime because of a bad seal or o-ring in the gerotor housing. So if the pto turns and you have no charge pressure remove the main pump and then the charge pump and check it over. Remember several things have to come off before you can remove that pump.