Ok, I went and picked up tractor at dealer today, Service writer gave me a break and charged me 6 hrs. labor for pressure test, still alot but oh well it is what it is and I appreciate them doing it, I know how it goes in the shop, I am no stranger to this, as I deal with heavy equipment repair shops in my line of work, I'm just not the one who pays the bills. time is time, and time is money, but I thought I would post their test results here if anyone wants to chime in for any advise,
this is how stated on invoice:
charge pressure is 105 psi. and spec is 57 to 99 psi.
High pressure forward and reverse maxing out at about 380-390 psi. spec is 3983 to 4125 psi.
high pressure is 2000 psi. spec is 1920 to 1991 psi,
so this is when they called me the other day and told me the findings and thought the high pressure relief valves likely the cause.
they then further diagnosed and this is what they found (also stated on the invoice)
did more troubleshooting on unit since both high pressure valves failed. did a direct pump test, failed. with low initial gpm, spec is 7.4, its at 5, moved down the line to the flow divider, same result as direct test, moved down the line again, the 3 point control valve dropped to 4 gpm. when restriction was added it would drop to zero gpm, bypassed the flow divider and control valve directly from pump to hst, tested and pressure still not their
So with that, I'm sure the hst is dead, but do all the other components like charge pump, priority and control valve need replaced too? I understand hydraulics to a certain degree, but this little thing seems to get overly complicated for me. so any advise helpful thanks.
ok more I think about it, pumps create flow not pressure, restriction creates the pressure, so that would explain why I'm getting high pressure readings from charge pump, even though its low on the flow output. just cant figure out where I'm loosing it in the priority and control valves ?