Combines R40 Possible Hydro Problem

Fishdog, The Sunstrand hydro used in the 40's and 50's are pretty reliable. Have you checked belt tension and belt for slippageIJ(Dirt build-up in grooves or belt worn and bottoming in sheave grooves,bottom of grooves will be shiney.) Have you checked or changed the hyd. filterIJ You may have a hyd. pump problem possibly and if there are any filings from a failure they would end up in charge filter. The rear section of hyd. pump supplies oil to hydro. The front section of hyd. pump supplies oil for all other hyd. functions. Another possibilty is the high pressure relief valve may be unseating to easily or be broke. You can switch reverse high pressure relief with forward high pressure relief to verify that high pressure relief valve is not the problem. Pressure checking is a for sure way of checking charge pressure(pump supply pressure) and hydro high pressure to make sure hydro is building pressure. Keep us informed, Hyper Harvest II

I have changed the filters, checked the belts and spring tension. Changing the filters made some difference but still have to go in first up some hills. After I get done with the beans done I will have pressure checks done.

also the orings on the high pressure relief F and R will cause a loss of pressure, remember to replace them when switching. AlSO check the main drive idler, if the two lock jam nuts are prevening the main drive idler to maintain pressure under load it will do this as well. The jam nuts on top are just to pull the idler up for service when removal of the main drive belt is required..