Posted by Jimb2 on May 01, 2011 at 13:04:56 from (99.240.236.11):
In Reply to: 3 pt Lift 2400B (454) posted by MadMax (TX) on May 01, 2011 at 06:46:59:
Hi Max, if the gear like chatter is coming from the area of the clutch housing, it is probably the PTO spline shaft where it is driven by the pressure plate. The teeth in the pressure plate become worn and the slop with the PTO causes the chatter. The hydraulic pump is run off the PTO shaft. This will be fixed the next time you do a clutch job. If the teeth on the pressure plate completely strip the PTO shaft will stop and no hydraulics.
Re 3pt not lifting properly, could be clogged hydraulic filter from chewed up parking brake material, or MCV splitter valve diverting to much flow to PS, oil cooler and PB or dirt in unloader valve. From Bernard le mécano Québec Canada, The unloading valve is under the seat and behind the big plug. Remove the plug and pull the spool, make sure to replace in the same way. It has a small orifice, blow dirt out with air. Replace the spool then the plug. Start the engine and check the lift system.
Also could be, the suction strainer is plugged. It's on the suction line, on rear end of the pipe. Drain the hydraulic oil, put a 3/4 allen tool on big plug and remove it, the strainer is inside the elbow, unscrew it and clean with solvent. Clean the dirt out of elbow.
The easy way to diagnose hydraulic problems is performing the flow and pressure tests as outline in shop manual.
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