saw mill hydraulics

[rasorbackq]

I am a pretty smart guy but when it comes to hydraulics I really know zero.
I have a home made saw mill that I bought . It has hydraulic cut as well blade lift. So this week it was cold out below zero . Saw has sat unused for a month or 2 . Took a boost to get the saw going and then the hydraulics didn't work. The 20 hp honda belt turns a pump which has 2 ccts . One lift and one for run. Neither worked so I thought it was frozen someplace. I popped the tank cap to see the ATF (pink stuff thought the last owner told me that's what he had in there) was pink and all foamy looking. Would have thought the ATF would look like it was pink and clear . I am thinking that It maybe got water in or condensation from the last couple years . Calling for 8 deg C tomorrow and will see if it all works again. If it does I will need to replace the fluid . Any thought ??

 

[J_J]

I think I would replace the ATF and look for a suction leak, which would make the fluid foamy or entrained air bubbles.

Put a heat gun on the valve and hoses to help the fluid flow until you change it out.

 

[dfkrug]

Hydraulic tools need to breathe a lot, so they often get water in the oil when left outside.
Some ice in the oil could cause some problems, yes. If you see foam, something is
sucking air, and that could be unrelated to the cold temps.

I am planning a bandsaw mill that uses hyd drive for the carriage only. Is yours
a circular saw or bandsaw?

 

[rasorbackq]

Hydraulic tools need to breathe a lot, so they often get water in the oil when left outside.
Some ice in the oil could cause some problems, yes. If you see foam, something is
sucking air, and that could be unrelated to the cold temps.

I am planning a bandsaw mill that uses hyd drive for the carriage only. Is yours
a circular saw or bandsaw?

Bandsaw mill
+6 outside now so will work on the saw today in the rain.

 

[glastron23]

ATF is a very good low temp oil to use. if you have water in the fluid it will turn it light pink and freeze up the hydraulics. this is more than likely your problem. This weekend should be warm enough to get it turning... 20 below is no fun... if it works then drain the oil and replace it, it will take several tries to get all the water out. if you can get some of the oil out of the tank you can do a crackle test for water. Monitor Water-In-Oil with the Visual Crackle Test
for a suction side air leak , this will cause the oil to foam after you use the machine for some time. check all the fillings from the tank to the suction side of the pump, check around the shut off valve on the tank (if you have one) and around the suction filter/screen (if you have one)

 

[rasorbackq]

So ran the saw today and the hydraulics work but as soon as I used them the reservoir over flowed with light pink foam and fluid. After I removed the cap all over flow stopped. I see there is a drain on the bottom but how does one get the fluid out of the lines.
Run the saw and pump them out?
Ii am thinking if I had a air leak would the saw leak fluid when the pump is turning?

 

[rasorbackq]

ATF is a very good low temp oil to use. if you have water in the fluid it will turn it light pink and freeze up the hydraulics. this is more than likely your problem. This weekend should be warm enough to get it turning... 20 below is no fun... if it works then drain the oil and replace it, it will take several tries to get all the water out. if you can get some of the oil out of the tank you can do a crackle test for water. Monitor Water-In-Oil with the Visual Crackle Test
for a suction side air leak , this will cause the oil to foam after you use the machine for some time. check all the fillings from the tank to the suction side of the pump, check around the shut off valve on the tank (if you have one) and around the suction filter/screen (if you have one)

I will try the crackle test. Not sure if I can get a hotplate to 160 though.

 

[rasorbackq]

Been reading on line ..... What do I flush the system with??

 

[J_J]

Flush with more ATF.

Blow the lines with air.

Use heavy duty tin foil or a spoon and a lighter or torch.

You might never see a suction leak. Just the results.

Just tighten up all the hoses.

 

[glastron23]

we just use the corner of an aluminum snow shovel (don't know where we would find one up here ...LOL) put a cup of oil in the corner and use a propane torch to heat the under side (do this out side) the oil will heat up and if you see any bubbles or hear crackling from under the flame then you have water, pure oil will just heat up and not bubble/crackle Jim