So got the first batch of oil samples back, one for the trans and one for the main hydraulics, now I just refilled the 30 gallon resivoir and an additional 12 gallons for everything else after a center pin, steering cylinder (2) and pilot pump overhaul. Here's the numbers. Silicon was high, wondering if we got some dirt stirred up in scrubbing the system or if its dirt migration from opening and closing things up? we tried hard to keep the open steering cylinders clean by stuffing them with rags and wrapping the ends but it was all done outside. Plans are to add in a bypass filter, 12 micron main hydraulic seems rather big. Thinking of stealing 1gpm from the 644E's pilot pump circuit and running that through a differential restrictor setup then the filter so it won't get overpressure or flow.
It's a shame you didn't get the ISO Code analysed - I see it's blank on your form. Yes it will be an extra cost but it will give you a very good idea of what size of particles (and how many of them per unit oil volume) that you are dealing with. The ISO Code is effectively a "Cleanliness rating" of the oil. Google ISO 4406 or try this link. http://www.precisionfiltration.com/products/iso-4406-cleanliness-code.asp
Thanks Nige, I can request that on the future tests, good to have for the future it seems. The hydraulic oil that was drained almost looked pearly in the light as there was so much stuff in it. Shortly after delivery, maybe a few hours of operation, the Hyd Filter light came on, changed the filter and cut the old one open, after settling and washing the element there was a full soda can worth of crap in the filter. Once the tank was drained there was a thin layer of gray glop on the bottom of the hydraulic tank, mopped and rinsed it all out so I imagine there is likely a lot more stuff hiding in the corners, possibly scrubbed out by the slightly foamy fluid in the first few hours of operation. What are your thoughts on a bypass filter plumbed into the hydraulic system?