I had noticed that my hydraulic oil seemed to be getting darker, so I decided after eight years, it was time for a change. After the factory 15W40, I put in synthetic 5W50 in the hope that I might see a change in performance on hills at high temperature, but I can't say I noticed any difference. On the cold weather side of things, the 5W did seem to make low temperature cranking a little easier, but the glow plugs made the enormous difference. So, this time is back to 15W40.
Here is my setup;
The white item in the center is an old vane pump that is oil compatible, hooked up to an old white dishwasher hose that has a wonderful rubber fitting that fits over the PT drain snugly. On the other side, I have a ball valve on a short piece of left over washing machine hose, but usually just use a power strip with a switch to turn the pump on and off. I have found that this makes for a quick oil change, and next to no oil spillage.
The blue bucket has about half of the empty milk jugs that are required to hold the used oil for recycling.
The hard bit was getting the plug out of the tank. I tried brute force, PB blaster, Deep Creep, a blow torch, two different impact wrenches, and nothing loosened it up. The first (cheap) Allen wrench that I tried was not up to the task.
With an extra two feet of leverage, the plug came right out. Does anyone know the threads on these? I suspect it is a hydraulic (nontaper) thread, but it didn't match any of my thread gauges. (In case you were wondering, this had Teflon tape on it when I put it in last time!)
Not shown: after removing the drain plug, there was a big glob of weld material halfway blocking the drain opening. I thought about trying to remove it, then started to worry about ever finding in the tank, or bulkhead openings if I knocked it off, and decided to just leave it. Later it occurred to me that as the threads on the plug are straight threads, the weld blob was probably just Power-Trac's way of ensuring the plug has a hard stop to thread up against. Thoughts?
The tank was pretty clean, except for a faint film of black dust. It didn't seem to be at all gritty. Any ideas on what it might be? I have magnets in/on the oil filter, so I am leaning toward rubber worn off the inside of the hoses.
I let the tank drain overnight, but only another half a pint or so of oil came out, and no sludge.
With a new hydraulic filter, and some purging, it is now all ready to go back to work.
Today's tasks: getting hay for the animals, and moving trash and debris out to the garbage cans. (Like the 17 gallon empty containers of the new oil, and a couple of gallons of the changed oil. It took a little over fifteen gallons; I had a pair of partial gallons around from changing the engine oil.)
All the best,
Peter