Hydraulics

[adventure bob]

Does the Kub (mines an L60) use the same hydro fluid for the loader and hydraulic functions as the HST trans? Is the fill on the rear diff the only place to add hydro? It seems strange to me, to run the trans and hydraulic functions form the same reservoir.
Pls enlighten a newb.

 

[JD 4520]

Does the Kub (mines an L60) use the same hydro fluid for the loader and hydraulic functions as the HST trans? Is the fill on the rear diff the only place to add hydro? It seems strange to me, to run the trans and hydraulic functions form the same reservoir.
Pls enlighten a newb.

Yes that is correct.

 

[murphy1244]

The HST has its own pressure filter. as the main Hydraulic filter is on the drain side.

 

[adventure bob]

So if Im following you guys...
If I dumped a bunch of hydro while connecting or disconnecting, not a normal amount but a bunch, the HST may have issues? Also if I hooked something up that had a serious flow pull the same may occur?

 

[MHarryE]

So if Im following you guys... If I dumped a bunch of hydro while connecting or disconnecting, not a normal amount but a bunch, the HST may have issues? Also if I hooked something up that had a serious flow pull the same may occur?

Do you mean if you lose a lot of oil when hooking something up and don't fill it back up will you have problems - the answer is maybe. The book says minimum of 30 seconds, more like 2 minutes in the tank, before going out in the circuit again. That gives time for sir bubbles to diss apace. Lose oil and the remaining oil has to go into the circuit the next time faster and it may still have air bubbles (cause cavitation) and also may be getting hotter as it circulates more frequently. Lots of variables to consider. Same thing if you hooked on an additional attachment that drew a lot of flow - not enough time for oil in the reservoir.

 

[Fallon]

HST & implement pumps are separate pumps, but they share a common tank & fluid. I think the power steering even has its own separate pump according to the Kubota site. Although steering might just be a priority circuit on the implement pump. It's not completely clear to me.

 

[mikehaugen]

HST & implement pumps are separate pumps, but they share a common tank & fluid. I think the power steering even has its own separate pump according to the Kubota site. Although steering might just be a priority circuit on the implement pump. It's not completely clear to me.

Not sure about your 'bota but my pump has 2 seperate output lines, steering and everything else. I believe there are 2 pumps built into the same housing.

 

[J_J]

So if Im following you guys...
If I dumped a bunch of hydro while connecting or disconnecting, not a normal amount but a bunch, the HST may have issues? Also if I hooked something up that had a serious flow pull the same may occur?

After all attachment cyl are filled and air purged, the only change in the fluid level will be the difference in fluid in the retracted stroke will be less than the extended stroke, and or course the heat will increase fluid level..

If you should lose enough fluid the hydrostat pump, and attachment pump might start sucking air

So recheck the fluid level after the tractor has warmed up and the attachments have been cycled.