I have convinced myself to use Allison/Castrol Transynd in my hydraulic system and will be changing that fluid soon. Given I am going to Transynd, the next fluid change will be a far into the future. Given that, I was looking at the hydraulic filters that are available that would best serve this purpose. What I have installed now is a Napa 5151 which is actually a Wix 51551. The rating on that filter as stated by Wix is 10 micron nominal, Beta 2 at 20 microns which indicates that it pulls 50% of 20 micron particles per pass. No bypass valve.
There is a Cat cross PN 077-3492 (high efficiency) to a Baldwin BT839-10 which crosses to the Wix 51551. The Cat filter spec just says 11-27microns which in Cat terms would mean a 10 micron nominal with a 27 micron absolute which would be a better filter then the Wix filtration wise. The Cat filter has a 25psi bypass valve while the Wix and Baldwin do not have a bypass valve.
So the questions are, has anyone used the Cat 077-3492 for a hydraulic filter in their coach and what are the pluses and minus of having or not having a built in bypass valve at 25psi? In general I like the robust construction of a Cat filters and the better performing filter media but I have no real idea what is right regarding a bypass valve in our application or if anyone has already been using one of these Cat filters.
There is also a cat standard filter PN 119-4740 for this application which is rated at 28 to 40 microns, while it fits, it would not be a PN I would consider using. I bring this up for information in case someone already has one in their coach. There is also an Ultra High Efficiency Cat version rated at 2 microns but I would be afraid that would plug up so that is out.
Any thoughts or experience?
Later Ed