Hydraulic hiccups

[mandtandk]

I changed the hydraulic filter on my 25 horse Agracat the other day, and since then, my box blade acts like it has the hiccups. When I raise it, it creeps slowly down maybe 3 or 4 inches, then jumps back up. My FEL does not seem to be affected. I thought there might be air in my lines because my filter installs horizontaly, and I did not put any fluid in it when it was installed. However, I have used it for about 2 hours, hoping to get the air purged out somehow. This has not worked yet. Does anyone have any ideas to help me? Could my problem be some worn rubber part that is allowing fluid to bypass something somewhere? The tractor only has appx. 200 hours.
Thanks to all,
Mike

 

[mandtandk]

I changed the hydraulic filter on my 25 horse Agracat the other day, and since then, my box blade acts like it has the hiccups. When I raise it, it creeps slowly down maybe 3 or 4 inches, then jumps back up. My FEL does not seem to be affected. I thought there might be air in my lines because my filter installs horizontaly, and I did not put any fluid in it when it was installed. However, I have used it for about 2 hours, hoping to get the air purged out somehow. This has not worked yet. Does anyone have any ideas to help me? Could my problem be some worn rubber part that is allowing fluid to bypass something somewhere? The tractor only has appx. 200 hours.
Thanks to all,
Mike

 

[JINMA224XR]

</font><font color="blue" class="small">( I changed the hydraulic filter on my 25 horse Agracat the other day, and since then, my box blade acts like it has the hiccups. When I raise it, it creeps slowly down maybe 3 or 4 inches, then jumps back up. My FEL does not seem to be affected. I thought there might be air in my lines because my filter installs horizontaly, and I did not put any fluid in it when it was installed. However, I have used it for about 2 hours, hoping to get the air purged out somehow. This has not worked yet. Does anyone have any ideas to help me? Could my problem be some worn rubber part that is allowing fluid to bypass something somewhere? The tractor only has appx. 200 hours.
Thanks to all,
Mike )</font>

Hey Mike,

Did you use the OE Filter or a CrossOver Filter?

Have a nice day,
Joe /forums/images/graemlins/cool.gif

 

[JINMA224XR]

</font><font color="blue" class="small">( I changed the hydraulic filter on my 25 horse Agracat the other day, and since then, my box blade acts like it has the hiccups. When I raise it, it creeps slowly down maybe 3 or 4 inches, then jumps back up. My FEL does not seem to be affected. I thought there might be air in my lines because my filter installs horizontaly, and I did not put any fluid in it when it was installed. However, I have used it for about 2 hours, hoping to get the air purged out somehow. This has not worked yet. Does anyone have any ideas to help me? Could my problem be some worn rubber part that is allowing fluid to bypass something somewhere? The tractor only has appx. 200 hours.
Thanks to all,
Mike )</font>

Hey Mike,

Did you use the OE Filter or a CrossOver Filter?

Have a nice day,
Joe /forums/images/graemlins/cool.gif

 

[tat2z1969]

</font><font color="blue" class="small">( I changed the hydraulic filter on my 25 horse Agracat the other day, and since then, my box blade acts like it has the hiccups. When I raise it, it creeps slowly down maybe 3 or 4 inches, then jumps back up. My FEL does not seem to be affected. I thought there might be air in my lines because my filter installs horizontaly, and I did not put any fluid in it when it was installed. However, I have used it for about 2 hours, hoping to get the air purged out somehow. This has not worked yet. Does anyone have any ideas to help me? Could my problem be some worn rubber part that is allowing fluid to bypass something somewhere? The tractor only has appx. 200 hours.
Thanks to all,
Mike )</font>

If you used the wrong filter it can act like that, a suction filter should be about 150 micron filter while a preassure filter or return line filter is about 25 micron.
If you put the wrong filter on it it is fighting to get oil and could cause cavitation on the back side of the hydraulic pump and damage the pump.
Check the spec's on the filter you used

 

[tat2z1969]

</font><font color="blue" class="small">( I changed the hydraulic filter on my 25 horse Agracat the other day, and since then, my box blade acts like it has the hiccups. When I raise it, it creeps slowly down maybe 3 or 4 inches, then jumps back up. My FEL does not seem to be affected. I thought there might be air in my lines because my filter installs horizontaly, and I did not put any fluid in it when it was installed. However, I have used it for about 2 hours, hoping to get the air purged out somehow. This has not worked yet. Does anyone have any ideas to help me? Could my problem be some worn rubber part that is allowing fluid to bypass something somewhere? The tractor only has appx. 200 hours.
Thanks to all,
Mike )</font>

If you used the wrong filter it can act like that, a suction filter should be about 150 micron filter while a preassure filter or return line filter is about 25 micron.
If you put the wrong filter on it it is fighting to get oil and could cause cavitation on the back side of the hydraulic pump and damage the pump.
Check the spec's on the filter you used

 

[mandtandk]

I had a Wix filter on before and changed with a NAPA Gold. Any ideas?
Thanks
Mike

 

[mandtandk]

I had a Wix filter on before and changed with a NAPA Gold. Any ideas?
Thanks
Mike

 

[tat2z1969]

</font><font color="blue" class="small">( I had a Wix filter on before and changed with a NAPA Gold. Any ideas?
Thanks
Mike )</font>

Napa is made by Wix, did you get the exact cross over? Could be a bad filter if the cross over is correct.

 

[tat2z1969]

</font><font color="blue" class="small">( I had a Wix filter on before and changed with a NAPA Gold. Any ideas?
Thanks
Mike )</font>

Napa is made by Wix, did you get the exact cross over? Could be a bad filter if the cross over is correct.

 

[RonMar]

Still got the old filter can? Put it back on and see if the system operates like it used to and you can purge the air out of the system. As mentioned, the suction side should use a strainer(metal mesh element, 150 micron). Hydraulic pumps are great at making pressure, they don't like making vacume to suck in fluid. If the filter you put on is too restrictive in addition to causing cavitation, the added vacume on the suction line will also cause air to be drawn in at every possible place between pump and filter(weak shrunk cracked "O" ring on pump housing, loose pipe union).

 

[RonMar]

Still got the old filter can? Put it back on and see if the system operates like it used to and you can purge the air out of the system. As mentioned, the suction side should use a strainer(metal mesh element, 150 micron). Hydraulic pumps are great at making pressure, they don't like making vacume to suck in fluid. If the filter you put on is too restrictive in addition to causing cavitation, the added vacume on the suction line will also cause air to be drawn in at every possible place between pump and filter(weak shrunk cracked "O" ring on pump housing, loose pipe union).