[Vwdiesel] Risks of Hydraulic Heating?

[James Hansen]

This year, I'm considering running the tractor at a moderate power
1800 out of 3000 RPM, and putting the hydraulics into a lock mode, so that
the pressure limiter goes into bypass.  I'm a little concerned about
the effects on the bypass valve (erosion, etc.), and local heating of the
hydraulic oil as it goes through the bypass.  Can anyone comment?

Val

That would be a tad risky in my opinion, as the cold, high viscosity
hydraulic oil may not be able to get through the bypass orfice fast enough,
creating a pressure spike, and rupturing a line.  Better would just be to
unplug the lines from one circuit, run a loop on that circuit, and then
engage the lever, let the flow go as normal.  As Svend wrote, the filter
*should* have a bypass, but not all tractors have one.  I have a couple
tractors that DO NOT, so if the filter fails catastrophically and plugs the
outlet, the hydraulic pump is the weak link, usually cracking  the side of
the pump casting to relieve the pressure. That is something to check before
you do this.  The pump *should* have a relief, but then again, all do not
have one either.
-James
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