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Message: <blockquote data-quote="bfingar" data-source="post: 3755" data-attributes="member: 331">Tazza:To the best of my knowledge, the relief valve for the system is part of the valve spool assembly well after the pump and port block, as the hydraulic fluid flows.  The pump does have a square block on top of it, it is what Bobcat calls the "port block".   I am assuming if the filter inside the "port block" was partially blocked, it would be a problem all the time and not just after the machine warmed up.  However, the symptom may be multiplied as the hydraulic fluid warms up and thins out.  That is why I am thinking it is the pump.  Have you ever changed or cleaned this hidden filter, supposably there is a special Bobcat tool # xxx to remove and install this filter.  I am wondering if the tool is really necessary first, or if necessary, can it easily be made with a hunk of steel, a gringer and a welder?  I'll drain the reservoir when I have a minute and pull the filter.The problem with the pump rebuild kit, (1) is that they are 2/3 the price of a new pump from Bobcat, and (2) does not include all the parts that you have mentioned.  The other problem is that the Vickers part numbers I mentioned, I am only 90% sure it is the same pump.  There is no way to verify until I have one in my hand.  Vickers dealers will only say that it is a valid part number, but they can not and do not have any details on how the part number is built or what it is for.  When I check the filter, I will pull the pump and measure it up to see about ordering a suitable replacement that will fit the 2 bolt mounting plate.   I only need a pump that will generate 9.5 gpm and say 2000psi at 2500 rpm.  I wonder what would happen if I found a pump that would supply, say 11 gpm plus the above specs?      ThanksBernie</blockquote>

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