NX5510 - No hydraulics after filter and fluid change

[MichiganIron]

I'm above freezing now (36). No change. Loosened the filter and there's plenty of fluid there (not going to pull it off and try to fill it). HST in which case I cannot back it up (or move it).

Thinking that if I were to loosen one of the output pipes from the pump that that might help with priming. Looks to be two 12mm bolts on each pipe. I think I can get to them. Will need to clean everything up real well first.

Keep it simple. This happens at times during a fluid and filter change, the pump can loose prime. Do not loosen any suction lines or remove anything. All it takes is a little compressed air in the transmission case to get things moving. Even though the case is vented, we have had good luck by just holding the air hose in the fill port with a rag around the hose to get a bit of a seal. With the tractor running at idle, and couple quick burst of air into the transmission case is usually all it takes to get the prime in the pump. Not much of a precise procedure, but it works every time.

Hope this helps...

 

[DieselBound]

I'd run compressed air and that didn't resolve. I suppose I could give it another shot, give it a bit more time than I had previously.

 

[DieselBound]

Would just like to add that I totally appreciate everyone here.

 

[RjCorazza]

I don't mean to send you down a random rabbit hole, but it is also possible that one of the filters is defective... Stranger things have happened.
I installed an aftermarket hst suction filter during a fluid change years ago, and the machine was dead in the water, very similar to yours. Out of desperation I put the old filter back on and it worked perfectly.
I have also had one OEM (Kubota) hydraulic filter that was defective, but that problem was very easy to diagnose!
I hope you get your issue resolved!

 

[MichiganIron]

I'd run compressed air and that didn't resolve. I suppose I could give it another shot, give it a bit more time than I had previously.

If you didn't fill the filters before installing, it will take some patience and more bursts of air to get the filters and the pump fully primed.

 

[DieselBound]

No luck on trying to pressurize again. Ran for about 10 minutes (hard to keep track of the time). Worried about running too long. If I know I won't kill the pump then I'll just got at it until it works.

RjCorazza, that thought has been with be from the very start. I had wanted to go with aftermarket filters (Donaldson) but decided I'd just go with Kioti: maybe bad decision this time? Going to be a huge mess to test this hypothesis. Really only wanting to try it as a last resort.

 

[RjCorazza]

No luck on trying to pressurize again. Ran for about 10 minutes (hard to keep track of the time). Worried about running too long. If I know I won't kill the pump then I'll just got at it until it works.

RjCorazza, that thought has been with be from the very start. I had wanted to go with aftermarket filters (Donaldson) but decided I'd just go with Kioti: maybe bad decision this time? Going to be a huge mess to test this hypothesis. Really only wanting to try it as a last resort.

I totally get that. I've never tried it, but I have heard of people using a shop vac on the fill port to change out filters with minimal fluid loss.
In post #6 @SPYDERLK mentions the suction filter seal. Sucking air here can cause the problems you are experiencing. In addition to my comment of a possible defective filter, I have also read about people doubling up the suction filter gasket (old gasket remains on case, and new filter gasket on top. The result could be a suction leak. That one would be easy enough to check for.

 

[JimR]

I just don't understand how the pump lost its prime. I do mine during the Summer heat because the oil flows so much easier when warm. You have oil in the filter. That means the oil is working its way forward.

 

[NUTTERDW]

Same problem happened on my CaseIH tractor after filter change. I pulled the Hyd filter back off and found that I did not the gasket in place like it should have. PROBLEM SOLVED

 

[DieselBound]

BAD HYDRAULIC FILTER! I put the old one on and it worked instantly! Of course, hydraulic fluid all over the place, but at least it wasn't for naught! Will take the DOA filter back to the dealer: and bets on how they'll react?

Pisser is that it's one more thing that isn't completed (will have to get a new replacement on).

Now on to changing the coolant and getting the beast out of my shop!