Help with hydraulic issue on ASV 120

[HeavyHauler]

Hello, I'm wondered if anyone has any advice on what part I need to fix my skidsteer. I have a 2020 ASV 120F with 1200 hours on it. I took it to the dealership a month ago because once the machine gets warmed up I am unable to steer in either direct and can not drive and lift the bucket at the same time. It has no power. The mechanic said the charge psi tested 425 cold and 225 when it warms up. He said he dead headed pumps against relief valve and found one pump good and one bad. Said both motors low on psi when hooked to pumps. Said the tandem pump and both motors needed to be replaced. The pump and motors went to a hydraulic shop to be rebuilt. They said they didn't see anything wrong with them but replaced all seals and whatever else that comes in the kits. No metal was ever found in the filters.The dealership put it back together and said charge pressure tested around 400. The said it was fixed. I took it home and it ran fine for 20 minutes just like it did before and then once its warmed up it won't steer again. I took it back to the ASV dealer and at first they said there was a cracked hose coming out of charge pump so the replaced it. That didn't fix it. Now they're saying the hydraulic shop rebuilt the tandem pump wrong and the hydraulic shop is blaming the dealer because they think its an issue with the charge pump and problem had nothing to do with tandem pump or motors. The dealer said they took the charge pump out and looks fine to them. I just spent $22000 on the repair that didn't fix the problem. I desperately need it to get back to work and I don't know what to do next. The dealer thinks i should buy a new pump. I would greatly appreciate any advice you have. I don't want to spend another $7500 on a pump if I don't need it and not confident the dealer is correct. My machine is just sitting at the dealer now not being worked on. Does it sound like the rebuilt tandem pump is the problem? Could it be the charge pump or something else? Thanks for taking the time to read this and your help.

[toprecycler]

My first thoughts are since it is so new, is there some computer sensor that is cutting power out when it warms up? Might be some valve or sensor that is miss functioning?

But if you spent $22,000 on this repair and still does not work, I would lose confidence in that dealer knowing how to service his equipment. How far away is the next dealer?

It would be one thing if you took it to a mechanic that had never worked on that particular machine before and didn’t understand how it worked, but the dealer should be better informed.


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[toprecycler]

Talked to my boss to get his thoughts. First we are not necessarily familiar with this actual brand, but initial thoughts are,

If there is a problem with pressure at the motor drive, usually those motors and pumps are a matched set. If you rebuild one, you really should rebuild both motors and the pump driving that motor. Then if they both share oil from same hydraulic tank, then other pump and motor should be rebuilt too.

Clearances in the pumps and motors are very tiny, in order to build the pressure. If it has higher pressure when cold, and then when warm it loses pressure, could because hydraulic oil thins out as it gets warmer, and then maybe pumps can not produce pressure. Something is not to tolerance any more somewhere.

Beware of metal particles in the oil for other hydraulic functions. I know you said there was no evidence of metal in the filter, but was the filter cut open to check? Something either wore away, or got scratched possibly.

Just other things to consider. It gets expensive quickly, for sure.


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[gimpyrobb]

Is there a way to verify the correct oil is in it?

[Grizz]

Is anybody checking the suction side for excess vacuum like either a clogged suction screen or collapsed hose.

[LKeithR]

Just a work of advice; when posting requests for technical help it's a good idea to put the make, model and description in the title of the thread. Makes it easier to understand what you're dealing with. I don't do much with machinery anymore so ASV 120 means nothing to me. It also helps other people who may be looking for help in the future to find the thread.

There's another active thread right now about a TX 650 which doesn't have a lot of info in the title...

[willyfixit]

I too would be checking for hydraulic pickup first. I have had kids (vandals) put leaves down tanks before. The leaves would come off during sitting (suction loss) then pick up again and block flow. Could be a collapsed hose as mentioned before or something in the hydraulic line that gets picked up and blocked. Also had the leaf thing in fuel tanks. Another bad one in the fuel was when someone put a piece of plywood in the the fuel tank that was covered in roof cement. The fibers in the roof cement was being slowly dissolved and eating the injection pumps. I don't know why manufacturers don't secure these machines better. The ASV's around here are mostly mulchers so sit out in the woods a good bit. Just my $.02 worth.

[mccutter]

Originally Posted by willyfixit

I have had kids (vandals) put leaves down tanks before.

I bought a '68 Chevy C-20 that had been sitting a while in a back lot of an auto parts store I worked at. Back in the days when you could buy a used truck for $75. Kids had stuffed the fuel tank (behind the seat) full of twigs and small branches. I pulled the tank and was able to get most, if not all, of the vegetation out of it. The roughage had the added benefit of soaking up most of the stale gas that was in it... Put an inline fuel filter in it and kept a spare and tools to replace it in the glove box.

[Matt Shade]

I don't know anything about that particular brand/model of machine but I agree with the other guys who said to check the pick up side of the hydraulics as well.

I did some work on an old bobcat and the pickup line from the main reservoir was a small steel pipe with several bends in it. It developed a pin hole due to rust and on this one it was on the bottom of the line and lead to a leak but I could see if it was higher on the line that it might allow the machine to suck air instead.

A lot of the tractors I work on have spin on hydraulic filters but also have an internal screen that needs removed and cleaned occasionally. I'd hope the dealer would know about something like that on such a new machine but you never know.

[midmosandblasting]

I don't get a warm feeling on the dealer .Seems like throwing parts at it .what about filters decent hours or due for replacement . My Ancient skid steer stops working when hot till you change filter .