Sorry for the long post but I need to outline the problem and where I am at in the diagnosis/repair stage.
Lost all hydraulic pressure. Oil level topped up. I removed the transmission cover. The pump drive appears ok. I tested for charge pump operation by reconnecting all lines except the one to the brake valve. Started the engine and oil was pumping out of the line in a good volume BUT instead of a steady flow it was spurting and appeared to have a lot of air entrained in the oil. Let the engine run for a minute or two at varying speeds but it continued to shoot out oil and air bubbles. So I removed the hydraulic pump and charge pump. The o ring on the pickup tube did appear hard along with the backup washer. Also noted wear marks/groves on the pickup tube (maybe caused by vibration?). The mounting bolts on the charge pump were not very tight, several fairly lose.
Should I only replace the pickup tube and o ring and backup washer or replace the seals in the charge pump too? Outlet and return lines on the charge pump appeared ok no leaks either end. But no hyd oil reaching the hydraulic pump. Probably not building enough pressure to open the valve to supply the hydraulic pump but I am only guessing this is the problem.
I would appreciate any and all advice as this is a new experience for me. Also suggestions for a good resource for o rings, backup washers etc. White tractor parts are not easily available in my area (Manitoba Canada) especially specialty backup washers and unique sizes for this type of hydraulic system. I think I will be looking at replacing many o rings/seals as there are many leaks throughout the system.
Thank you for you help.
Lost all hydraulic pressure. Oil level topped up. I removed the transmission cover. The pump drive appears ok. I tested for charge pump operation by reconnecting all lines except the one to the brake valve. Started the engine and oil was pumping out of the line in a good volume BUT instead of a steady flow it was spurting and appeared to have a lot of air entrained in the oil. Let the engine run for a minute or two at varying speeds but it continued to shoot out oil and air bubbles. So I removed the hydraulic pump and charge pump. The o ring on the pickup tube did appear hard along with the backup washer. Also noted wear marks/groves on the pickup tube (maybe caused by vibration?). The mounting bolts on the charge pump were not very tight, several fairly lose.
Should I only replace the pickup tube and o ring and backup washer or replace the seals in the charge pump too? Outlet and return lines on the charge pump appeared ok no leaks either end. But no hyd oil reaching the hydraulic pump. Probably not building enough pressure to open the valve to supply the hydraulic pump but I am only guessing this is the problem.
I would appreciate any and all advice as this is a new experience for me. Also suggestions for a good resource for o rings, backup washers etc. White tractor parts are not easily available in my area (Manitoba Canada) especially specialty backup washers and unique sizes for this type of hydraulic system. I think I will be looking at replacing many o rings/seals as there are many leaks throughout the system.
Thank you for you help.