Oil & Fuel Changing hydraulic oil in 425 power-trac

[woodlandfarms]

From what I understand, heating, and even welding on and oil tank is moderate risk. Takes a lot to light oil on fire. Throw a match on oil once, you will learn it takes a lot more to get it going. Not to say it isn't dangerous, just not like welding on a gas tank.

As for the filter, on my 1850 we have 3 output hoses from the oil tank. Only one is filtered (the wheel motor lines) which makes no sense at all as the wheel motors don't use a lot of oil from what I understand (it is kind of close to a closed loop system) I do have a second filter on the lift tilt dump circuit that is high pressure. But it is downstream of the pumps so a bit worthless as well.

 

[MossRoad]

Your filter will probably catch the metal shavings also before it gets to the pumps. Hope you get it figured out with the least trouble.

Its my understanding that the filter is only on the charge pump side of the tram pump and does not filter anything going to the PTO pumps. I.E. the filter only protects the tram pump and wheel motors. Someone correct me if I'm wrong. Thanks.

 

[KentT]

Coming from someone who's changed out their oil, I think you'd be surprised at the amount of metal particles in it. I stored the old oil in 1 gallon jugs for possible reuse for other purposes -- I was thinking perhaps to oil the chainsaw chains. After a few months of sitting, there was a thin layer of grey sludge/metal coating the bottom of each jug that settled out of the oil. Given that, I decided not to reuse it and took it to the disposal center...

Though there may be a 10 micron filter in there, it doesn't filter all the oil all the time... and metal is metal, regardless of how small the shaving is...

I don't regret the expense...

 

[SpringHollow]

In case there is any doubt that there are metal filings in there look what is on the tank magnets:



Ken

 

[Kaon99]

Guys,
I had a welding shop put a handle on the oil drain plug. It moves now just fine. The main reason I am changing the hydraulic fluid is that it appears to have water in it. There is a brownish layer on the top of the oil. Has anyone had water (or something else) suddenly appear in the hydraulic fluid? Ken

 

[woodlandfarms]

Befor changing suck the layer our. About tho only way to get water in the system is through washing. Maybe a rain...

 

[J_J]

Using my 1445 as a reference,

I believe the only filtering that is done on the PT is through the charge filter for use by the VSP pump, which is a 10 micron suction filter.

This filter is necessary to keep the VSP pump clean and working, especially since it is a closed loop hyd system and only gets makeup fluid when fluid is flushed through the pumps case , and then to tank

The the other two pumps fluid go to tank with no filtering, so it is not hard to see that there could be metal, rubber,trash, etc in the tank.

You could perhaps add a return filter before the tank return, but there might be several tank returns.