My '49 8N, "Bessie", has a Dearborn front-end loader. In years past I have made repairs to the control valves, the bucket and the hoses, but this year the pump seems to be at fault. The system lifts the assembly slowly and stalls with a heavy weight attached. The pump appears to be the old style: small, square and with a plug on the outboard end. I haven't found a rebuild kit or a replacement so I thought I would post here and ask for advice.