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Masseynut(Australia)
05-08-2008 05:24:27
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Re: Hydraulics for MF 165 in reply to Jewel Watts, 05-07-2008 11:58:15
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Adding to David's thorough info, just a couple of things to check. As David explained, drain the transmission oil down by 8 litres,(2 gallons), or so, remove the right hand side (round)cover from the rear housing, (by your right ankle), and take a look inside either with a mirror, or with your eye, if your nimble enough, and check for a leak coming from the ram bolted to the under-side of the lift, (or hitch) cover, , while engine is running, and lift is in raised position. If oil is leaking from the ram, this would be one oil leak to rectify. Now, as David suggested, check for excessive oil emenitating from the pressure control unit and diaphram, (bolted to the plate hanging down from the lift cover), or the relief valve mounted in the back of the hydraulic pump. Either leak should be quite evident as a hissing or squirting of oil from either valve. By the sounds of your description, it should be an easy leak to find, as it is leaking quite a fair amount of oil rapidly. If no oil leak is evident from the ram or P.C. valve or relief valve, you will have a leak in one of the exhaust valves in the hydraulic pump. This will require removal of the lift cover and/or splitting of the tractor at the gearbox/ centre housing, (depending if your tractor has auxillary hydraulics). If the pressure control valve is the problem, don't bother repairing the valve, as parts are expensive for this unit, simply remove it completely, fit a standard straight type stand-pipe, (with-out the elbow pipe to the P.C. unit), and fit a new 2850 P.S.I. relief valve into the back of the hydraulic pump, (or blank off the pressure port to the P.C. valve in the lift cover). let me know what you find. Hope this makes some sense, regards, Evan.
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