Case 580SE having hydraulic fluid changing problems

[Tinkerer]

Awesome ! Thanks for the update.

 

[melben]

It is very easy to ruin the hydraulic pump due to the way the suction run is designed, The reservoir is mounted low and they do not gravity feed to the pump, I have worked on dozens of them over my career, When I do that process I always put a 1/4 flat face coupler on the pressure test port with a hose into a 5 gal bucket before starting the machine, that allows air in the suction run to be pulled out. the pump does not have to pump air against static pressure in the system I have seen pumps destroyed during the servicing process. I personally do not see how pressurizing the reservoir is of any benefit as common sense tells you that you are also pressurizing the return side as well and as I said, I have been there many times in my 50 yr Case career and freeing up the flow on the output of the pump is the quickest safest way.

Also just my two cents and do not want to start a war on oils but I would use nothing but Hy Tran Ultra in any hydraulic system I cared about. Good oils have additives to help the oil from foaming and I have seen first hand the results of inferior oils, also there is a difference in cylinder packing life with HTU. I am convinced of that. I was threatened by a Oil company for discouraging my customers from using a certain brand. I have posted here before on this problem, this certain brand oil swelled the piston packing material to the point that the cylinders would literally squeal when moving and when rebuilding they had to be pulled apart on our rollback with the winch. In service I was on the front lines fighting these problems and I believe stand on pretty firm footing. I do not know of any other oil with the exception oh HY Gard JD oil that I would put in a machine that has to do 8-10 hrs a day. There may be other oils out there, probably are, but I would just as soon stay with what I know works.

 

[Steve Favia]

Thanks for the info melben,my hydralics seem to be fine,did put Hy Tran fluid in.Looked in my owner’s manual under hydraulic oil filter change doesn’t even say anything about priming pump little scary.My 580k took 5 gallons to refill.

 

[melben]

Glad it all turned out well. I have seen pump failure in our shop from pumps not priming, just a little squeal and they are history, I'd rather not take the chance, Once you have worked on this stuff as many years as I have and watched gauges and seen several hundred pounds of back pressure on a normal working system with no systems activated you can see why a pump that is airlocked cannot purge itself. Putting a 1/4 inch quick coupler on the test port and relieving the pressure is just like loosening a line and a lot quicker.

 

[Steve Favia]

I think it’s fine but I value your opinion melben,the lines stayed full of fluid the 4 days it took to repair the cooler,everything is working fine do you think it’s good?

 

[melben]

Thanks for the info melben,my hydralics seem to be fine,did put Hy Tran fluid in.Looked in my owner’s manual under hydraulic oil filter change doesn’t even say anything about priming pump little scary.My 580k took 5 gallons to refill.

Steve, looking back over this thread and saw your note, the 580K uses a high reservoir which gravity feeds the pump, you will not have the particular problem typical of the outboard reservoirs.

 

[Steve Favia]

Thanks melben appreciate the response!

 

[LuckyDog308]

... I always put a 1/4 flat face coupler on the pressure test port with a hose into a 5 gal bucket before starting the machine..."

I have a 580SL. Would I use the same coupler as on the 580E?
I am new to hydraulic fittings. I need to find the correct coupler to set the main relief valve pressure.

 

[melben]

That should be a common 1/4 flat face coupler, most hydraulic shops can fix you up.

 

[Tinkerer]

Welcome to HEF, you LuckyDog !

 

[LuckyDog308]

Friend of a friend had a gauge with a 10 foot hose that fit. Was nice to sit in cab and see pressures while operating the valves.

Turns out for my 580SL series 1, it's an ISO 15171-1 fitting. The diameter of the nippel is 12.5mm (0.49 in). (a.k.a. 1/8 body)
A 1/4 flat face nipple is 5/8" diameter. (0.625)

Just FYI. Hope it helps someone down the road.