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If the filter is clogging between service intervals then you can conclude:

1) The system NEEDS a filter.

2) The filter is too small for the contamination load.
OR
3) The system is shedding contamination faster than anticipated or normal
and you have a problem.

Without a filter to inspect you have no idea when your hydraulic system is
about to self distract. The filter I used was a fuel filter (30 micron) from
Airflow Performance, the same filter I used in the fuel supply. I installed
the filter in the return line (low pressure) without a bypass. Due to the
cavernous capacity of the filter the pump would be worn out before the
filter clogged.

If you want a bypass valve for a return side filter I would recommend a
Kepner 1304A-1-24. This is a check valve with -4 JIC male fittings at each
end and a 25 PSI cracking pressure. Placed in parallel to the filter it will
bypass fluid if the filter clogs.

Regards
Brent Regan

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Please send your photos and drawings to marvkaye@olsusa.com.
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