On 06/21/2016 2:30 PM, email@example.com wrote:
Well, as the prelude to the above charts says, "viscosity is the key"
but generally detergent-type motor oils aren't recommended altho I've
just learned in another group in the last week there's a large class of
hydrostatic tranny's in ZTRs and similar gear that does spec 20W50 oil
for the hydraulics. I suppose if one starts with it and stays, there's
not the likelihood of the moisture issues that could occur if switched
after years of non-detergent.
I'd not like to think what used oil is doing for the longevity of the
system they're putting it in--"you can pays me now or pays me later!"
probably holds; they may save some money in the short term but odds are
there are major repairs down the road and it might just be cheaper to
fix the leak(s) first.
The manlift main lift and extend cylinders developed seal leaks here;
the extend cylinder is a 2" rod/3" bore with 174" stroke; the system
capacity is 70 US gal so one can lose a lot of hydraulic oil in a short
time which ain't cheap...the $40+/- seal kit looks pretty good in
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