Hydraulic pump cavitation
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Anonymous Poster
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Re: filter change
ATF is high detergent. This may have loosened up a bunch of crud in the system and be plugging the screen/filters. I would get enough of the proper fluid for 2 changes and change it then run it for an hour or 2 and then clean the screens,etc and change it again. Hopefully all will be well after that.
ATF is high detergent. This may have loosened up a bunch of crud in the system and be plugging the screen/filters. I would get enough of the proper fluid for 2 changes and change it then run it for an hour or 2 and then clean the screens,etc and change it again. Hopefully all will be well after that.
Chief
Gold Member
Need to get that filter off and install the correct filter ASAP and DO NOT run the tractor until you do. Cavitation will destroy a pump and its seals. Use the hyd. fluid the manufacturer calls for.
Anonymous Poster
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Re: fluid condition
I would suggest flushing it as well. It sounds like the small micron filter plugged quickly after change, an indication that there's trash in the system. If the small micron filters are less expensive and more readily available I might buy 2 or 3, flush the system with good fluid, then run the system a few minutes, replace the filter, do this a few times before putting the correct filter on.
I would suggest flushing it as well. It sounds like the small micron filter plugged quickly after change, an indication that there's trash in the system. If the small micron filters are less expensive and more readily available I might buy 2 or 3, flush the system with good fluid, then run the system a few minutes, replace the filter, do this a few times before putting the correct filter on.
WVBill
Veteran Member
Re: fluid condition
I'm wondering aloud here but...
If you HAVE to temporarily use something other than the OEM filter wouldn't it be better to use one with a micron rating slightly larger than the OEM?
I'm thinking that junk in the system that's a few microns bigger than what would be filtered by the OEM filter would be less dangerous than cavitating the pump due to a constricted flow. ...Unless, of course it's an HST....
I'm wondering aloud here but...
If you HAVE to temporarily use something other than the OEM filter wouldn't it be better to use one with a micron rating slightly larger than the OEM?
I'm thinking that junk in the system that's a few microns bigger than what would be filtered by the OEM filter would be less dangerous than cavitating the pump due to a constricted flow. ...Unless, of course it's an HST....
uhmgawa
Gold Member
Re: fluid condition
</font><font color="blue" class="small">( I'm wondering aloud here but...
If you HAVE to temporarily use something other than the OEM filter wouldn't it be better to use one with a micron rating slightly larger than the OEM?
I'm thinking that junk in the system that's a few microns bigger than what would be filtered by the OEM filter would be less dangerous than cavitating the pump due to a constricted flow. ...Unless, of course it's an HST.... )</font>
It depends. Most articulating hydraulic components specify
a maximum allowable aperture for the system filter. So that
is one constraint. The other is the volume of fluid a filter
can continually pass before its internal bypass valve will
open. Both requirements need to be satisfied.
</font><font color="blue" class="small">( I'm wondering aloud here but...
If you HAVE to temporarily use something other than the OEM filter wouldn't it be better to use one with a micron rating slightly larger than the OEM?
I'm thinking that junk in the system that's a few microns bigger than what would be filtered by the OEM filter would be less dangerous than cavitating the pump due to a constricted flow. ...Unless, of course it's an HST.... )</font>
It depends. Most articulating hydraulic components specify
a maximum allowable aperture for the system filter. So that
is one constraint. The other is the volume of fluid a filter
can continually pass before its internal bypass valve will
open. Both requirements need to be satisfied.
thread
Very intersting reading, I believe a JD 950 was also a Yanmar built tractor. If the filters and fluid don't help I guess the pump may be coming off. I did look carefully for suction leaks but the sevice manual keeps mentioning bad pump seal which I also ordered. I did get a 3000 psi gauge in today that I plan on installing right after the pump, just to see what it may say. Thanks, bill.
Very intersting reading, I believe a JD 950 was also a Yanmar built tractor. If the filters and fluid don't help I guess the pump may be coming off. I did look carefully for suction leaks but the sevice manual keeps mentioning bad pump seal which I also ordered. I did get a 3000 psi gauge in today that I plan on installing right after the pump, just to see what it may say. Thanks, bill.
