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if i understand you right your saying the cooling fan doesnt work at all , yes it's run by a electric motor , it's triggered by the ECM via a control relay /fuse that gets a cool /notcool signal from engine coolant sensor any of these not working correct will produce the effect u see, normaly this will make the fan ,Modulate (off/on) for diff enviroments like mine doesnt even run when plowing snow but runs all the time plowing a field , due to diff time of year
accord to my books this tractor has a wet clutch transmission (12 speed) , first thing is to ck your fluid level in transmission , this is bit hard to reach on this one but is possible second obtain a small sample of fluid from transmission, have it tested , It can tell you alot , second you mention that hydraulic pump overloads engine with simple tasks like raise 3-point, this could be a stuck pressure relief valve due to yep you guessed it dirty filter (it bypassed itself) ck hyd fluid for proper level and clarity ohh and one more thing this tractor uses hyd pump for power steering (some others have 2nd pump for this) is it possible that noise is coming from that area , cus I have had to replace power steering valve on that model once for a loud Noise reason
remember if your gonna have a all hydro tractor save yourself a lot of grief and periodly wash shaft seals with water sure saves a lot of grief and leaks !!
1st ck hyd tank for fluid level and fluid quality 2nd remove and ck hyd filter for blockage (note some hyd filters have a water sensing block valve inside) 3 rd verify that fluid is reaching pump , pumps will make horrible noises with no fluid in them , if all are well replace pump , and ck that bypass valve is not stuck open and is set correctly (some are internal to pump )
a method i've been sucessful with is to temp power hyd system with remote from another working tractor/bobcat , this sometimes unsticks bypass valves , but unless your familiar with what fittings do what and such I don't recomend this action for novices
The hyro unit has two cylinder blocks, a variable displacment pump and a fixed motor block, you should always mark the top of the pump thrust housing as this can be put back unside down which will result in what you now have.