Posted by Kurt-NEPA on March 13, 2012 at 17:08:07 from (50.76.116.35):
In Reply to: Ford 600 hydraulics posted by BobW on February 29, 2012 at 10:32:52:
Yep! Parts get expensive in a hurry. Try the simple and cheap stuff first. You can usually get a pressure gauge at Tractor Supply for about $30. Still might need some fittings.
My experience says the usual problems on the hundred series hydraulic system are (in order of likelihood)
1. O-Ring/Backup washer failure on the slave cylinder (main top cover cylinder)
2. Leaking shaft seal on the hydraulic wobble shaft in the piston pump. (Can't get pump to hold prime)
3. Bad/Stuck unloader valve O-ring (erratic lift)
4. Worn control valve (usually results in hiccups or bobbing)
5. Other blown O-rings or bad gaskets (could be any of them)
6. Crap in the check valves or back pressure valve
7. Worn check valve springs and balls in the piston pump.
8. Bad Safety or Relief valve (rarely a problem)
9. Ruptured / corroded tubes in the center section or transmission. (A leak in the transmission pressure tube results in a gain of oil in transmission - this is a common problem in these old tractors, but the hydraulics may still work if it not too bad.
That assumes all the linkage is in good condition and in adjustment.
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