Hydraulic pump problem

[lostdog]

I have a lexion 570 with a noisy hydraulic pump that drives the reel. The pump is located on the left hand side of the combine above the fan and takes its drive from a v belt. Has anyone encountered a problem with these?

I have been informed by a claas man that they do not normally make any noise. It is slightly lumpy when turned by hand.

Does anyone know where I could send it to be looked at or tested?

Thanks in advance