I replaced my Agitator motor, and the new one started leaking oil a couple weeks later. So, i got a new one from Schwing and now today it is leaking? I wonder if something i am doing with the alignment or other is causeing this, or am I just unlucky with parts? The shaft and bushings are in good shape. Its an 02 Schwing 32 meter.

Thanks

I would wonder what pressure is going through the motor

Is the agitator bent?

They were both brand new from Schwing under waranty. I think the pressure on the oil is the same as the rest of the system? I have a call into Schwing to see if they can figure it out. The odds of a defective part went down after the second motor. My shaft seems very straight and spins freely. 

oil pressure for sure  

I thought oil pressure in Schwing is directly related to the pumping system pressure as a whole. or the pressure goes up and down as a unit. ? How could an agitator motor be getting over pressured. Seems to me it is just spinning the shaft or not spinning it if it gets tough. I don't know i had a busy day left at 430am drove 160 miles pumped 140 yds then raced home to beat the 430 pm sunset (didn't happen) to pump 40 yds of walls. Nice day today but it might be 5 degrees F tomorrow they wanted to get them done. cold front moving in tonight.

Pressure for the agitator should be 200 bar, you may need to install a minimess gauge conector; seal kits for these motor are ok, as long as the shaft does not have a groove cut into from the old seal ( this would defeat the purpose); the odds of two motors leaking are pretty slim, but not unheard of; maybe they had a quality issue during production of these motors?

The hydraulic for the agitator is not depending on pumping pressure, if i remember correclty, these motor are rated at 350 bar

I talked to the Schwing engineers they said i must have the alignment of the key way shaft misaligned. I don't know how i just unbolt the old, mate the two shafts and bolt up. Maybe the bolts pulling the motor on are putting stress on the alignment.On another hand maybe there is something in the back out the hole keeping the shaft from going all the way to the back with out stress (this is my thought). I think the two must go together, slide in all the way with out the need of the mounting bolts. Hopfully Schwing will warranty the second motor..

hopper sides true?

Yeah they're factory true as i can tell.

Motors are rated for system pressure, but shaft seals don't usually see full system pressure.  They see case (return) pressure, which is much lower. 

If allignment and grooved shafts are not the problem, I'd check pressure in the return line.  Put a "T" in the return line and a gauge in the "T."  You would have to check motor specs, but I'd be surprised if case/returm pressure is more than 10% of inlet pressure.  With no load, I'd doubt you world see 10 bar on the return side.

High return pressure can be caused by restriction in the return line.  A hose might have developed an internal flap.  Some systems use return filters, and they can create high pressure.  A plugged or restricted check valve can also do it.  Check your schematic to see if there are any in the circuit.  

I've even seem motor replacements that have case drain ports, where the original motors did not.  Some actually need to have the case drains connected.