Hydraulic pump priming after overhaul ?

j carter · Mar 8, 2021

On my F 450, had the lines disconnected from pump and reservoir drained. How do you make sure your pump is getting oil at startup? I am worried about not picking up oil? With the lines coming out of the top of tank/control body, it looks like it will be hard to get oil to the pump? Was going to use HyTran.
Thanks for any advise.

DeltaSteve · Mar 8, 2021

Just start it,it will prime itself. The residual oil in the pump will be sufficient to prevent damage.Just make sure your reservoir has the correct amount of oil in it.HyTran or equivalent is
perfect.

bc · Mar 8, 2021

Don't know about the 450 exactly but if it has the pump on one side and the filter on the other, then remove the filter and start pumping hytran with a pump can through the suction pipe to get some over there. Or take a outlet hose loose from above and pour or pump some in. If there is a plug on the outlet side, that would be where you could stick in a gauge. Find something to pump some oil in that way such as a plastic hose pump from HF or pump some in from the outlet. Then make sure it is filled enough that there is hytran at the suction filter. I suppose just cranking on it for a while with a coil wire off will get some oil in there as well and not burn it up.

j carter · Mar 8, 2021

Tractor was split for six weeks, so oil in lines to the pump from reservoir and pump are completely dry! Drained reservoir to put new oil in as well. Will take plug out of top of pump and put as much oil in as I can. Worried that the long suction line from top of reservior to pump will have a lot of air before it gets oil to pump.

used red MN · Mar 8, 2021

If you pour oil in a plug in the pump you have no worry, it will pick up prime in short order. If your tractor has
power steering that should tell the tail. If you dont seem to have any hydraulic action after 30 seconds at idle
you might have some concern. Then maybe try pouring oil in the pump plug again. It should be fine, I think the
hydraulic fluid level in the resevoir is higher than the pump inlet anyway. What bc posted does not apply to your
tractor, that is for 60 series and up with pumps inside the rear end.

EP · Mar 8, 2021

Put the the nose heading downhill as steep
as you can, nothing crazy of course. It
should pick up prime on it's own. There is
a bleed screw on the pump that is on mine,
but there are 2 different pumps. But it
makes a mess if you prime it by loosening
the plug.

Roger in Wisconsin · Mar 9, 2021

Clean strainer and breather cap.
Fill the system to the full mark.
Start the tractor and operate at a moderate idle speed.
With the filler plug removed, move the control handles
back and forth ten or twelve times through there full
range of travel. This frees the system of trapped air.
Then with the handles in the neutral position, stop the
engine.
Add fluid to the full mark and replace the filler plug.

Hydraulic pump priming after overhaul ?

j carter

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DeltaSteve

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bc

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j carter

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used red MN

Well-known Member

EP

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Roger in Wisconsin

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