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Does the pump provide adequate pressure on warm days? If so, going to a larger pump will get you nothing but more volume I would think. Your pump should work better cold than hot if it's worn too as the higher viscosity oil would compress easier (wouldn't leak out the worn parts as fast). Sounds like the viscosity of your fluid is too high for the ambient temp. Thinner fluid would be the order of the day. You could check the fluid maybe by taking a sample and a sample of the correct fluid for your hydraulics/tranny/ diff/ steering and get a paint viscosity checker from your paint store. Maybe you could get the fluid real cold (to get a better reading) and put it thru the strainer. Should answer your question. Orrrrr rr your hyd filter may be clogged and the colder, higher vis fluid makes it harder to get to the pump. I recall that the 40XX series has 2 systems, a 2500 and 150# system. One is for working, the second for cooling and filtering. Would have to look to see how they interact considering higher viscosity fluid. Does your tractor have a front mounted pump? If so, does it rattle like crazy when first started on cold mornings? Does your power steering work ok when you first start up? Mark
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