Must be an add on hydraulic pump. The Cat system uses steel lines with o-ring flange connections to the pump.
Pretty sure the pump is a Cat part as it is part of the front end of the engine. Internally driven, I am guessing off the front end of the crankshaft along with the camshaft gear. I will try to get the grease and dirt off of it and see if I can find a part number on it. I need to get the correct manual for it. I am looking at an older manual. I think this machine is a late 60's or 70's model with electric start.
Thanks.
If it is a Cat system there should be a serial number on the engine side of the dash mounted tank or on the top of the fender mounted tank.
Your s/n indicates a 1961 D4C.
I have the same tractor 40A3638 with Cat hydraulics. The service manual and parts book doesn't cover the hyd system, it's a separate book. You local dealer can dig it up if you have the # off of the hyd tank. They can fax or email the parts breakdown. If you can't find the system group # PM me and I'll send you the one off of mine, they will need the # to help you.
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