3020 Gas Hydraulic Pump

ajhbike

Member
Per an earlier anthology....I removed the hydraulic pump because it was leaking out the front seal a bit. I did all the firsts...removed the front carriage, the 2 side fittings, the upper banjo bolt fitting and the drain line. All of it loads of fun!

I had a pump off of a salvage tractor that was supposedly not leaking and working well so I took a chance without doing anything to it and put it in and put everything back together. Started up the tractor and I don't believe I am getting oil to the pump...the manual destroker will push down the valve so I know the main valve moves.

Could there be an "air lock" or something like that? If so, how and where would I bleed it out? Thanks.
 
Not sure what you mean but after running it for a few minutes there was no hydraulics i.e. steering, 3 pt. and I didn't hear it kick it like it usually did once the oil gets sent up to it from the rear after starting up. I assumed there is either an air lock which you say isn't possible or I put in the old pump and it isn't functioning.
 
..the manual de-stroker will push down the valve so I know the main valve moves. This is your statement I was referring to. I thought I quoted you in my other reply. If tractor has a Syncro-range trans did you have your foot off of clutch pedal when attempting to get pump to pump oil?
 
Ok sorry...and thank you as always Jim....I was thinking maybe the valve wasn't free moving and screwing in the destroker told me it was moving.

You know, I may have had the clutch in so I will try it again tomorrow. I should have either taken this pump apart to check it out or replaced the seal on the original...but I accepted that I may have to take everything apart again.

At least I know how to do it now and all that anxiety is history... LOL
 
Ok sorry...and thank you as always Jim....I was thinking maybe the valve wasn't free moving and screwing in the destroker told me it was moving.

You know, I may have had the clutch in so I will try it again tomorrow. I should have either taken this pump apart to check it out or replaced the seal on the original...but I accepted that I may have to take everything apart again.

At least I know how to do it now and all that anxiety is history... LOL
IF you actually had your foot on the clutch the transmission pump wasn't' running and the front pump will NEVER get oil in that scenario.

The transmission pump CAN lose it's prime and take a while to prime, but you don't mention that has been a problem in the past. That's a whole other story and it involves a check valve.

Once the transmission pump is forcing oil forward it shouldn't take long for oil to get to the front pump.

The oil cooler doesn't need to have oil in it for the main pump to prime, the front pump gets filled first, then excess oil flows UP to the cooler and begins filling it.

Once the cooler is full oil begins flowing rearward and supplies the transmission lube circuit.
 
Thanks. I knew all that about the clutch and the transmission pump but I probably had the clutch in without thinking.... listening and watching for oil spouts. We'll give it another swing tomorrow.
 
Well, that did the trick... embarrassingly so since I absolutely knew that. No leaks...yet and quieter without the clacking. Thank you.
 

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