John Deere 2720 Hydraulic Steering only works with PTO engaged

[smashedtoe]

Hello.

I am trying to figure out what happened to my little John Deere 2720.

I had the charge pump recently replaced, however, the steering is very spongy and difficult to turn. Oddly enough, when I engage the PTO, the steering seems to improve. I also notice the hydrostatic drive seems very noisy and reduced response.

Seems to be air in the line which surges out when I crack a line in the system.

Suspecting a relief or bypass valve? Any idea where this is located on this tractor?

Thanks.

 

[Harry in Ky]

Sounds to me like you need to be discussing this with whoever replaced the charge pump. That would be my starting point.

 

[SATOHBULL]

Have you confirmed the fluid level and/or type used after the pump work? That would be my first look.

 

[smashedtoe]

Hi Satohbull. Yeppers, I sure have. Using John Deere's liquid gold (or the price of it seems to be) Hy Guard. Levels are good, filters are new and sump screen has been inspected.