mkirsch said: (quoted from post at 06:59:49 09/11/12) The problem with draining the lines is twofold:
1. You STILL don't get all the old oil out.
2. You now may have problems with air in the lines.
There's nothing you can run through the system (i.e. pump, lines, cylinders) to flush it out, without causing problems, except fresh hydraulic fluid.
Hytran can hold tremendous amounts of water in suspension with no ill effects. The game is not about getting ALL the water out, just keeping the amount of water that's there to a dull roar. Lots of perfectly good hytran is thrown away in futile attempts to eliminate ALL the water.
I agree you will never get all the water out, but in modern high pressure sysyems it can still cause problems. Yes, some hydraulic fluids can and do hold a lot of water in suspention, but in high pressure systems, water is as bad as any other contaminant when the system gets hot. The water will boil and the "gas" bubbles are as bad as sand going through the pumps and valves... been there.
We ran a lot of tests at high temp in the experimental lab and if you ever saw a piston pump run at 220 degrees and 5000 psi with water in the fluid, you'd know what I mean. It will errode as bad as any contaminant there is.
Had to come back and edit this... wife "needed" the computer and I didn't have time to proof read.
This post was edited by IH fan at 08:38:22 09/11/12 2 times.
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