hedgeless_horseman
Member
This weekend, when I took a break after several hours of running my PTO bush hog on the 3 point of my 820, the rock shaft would not operate. I made sure it was on the top setting #1 (Load?) but it still would not lift the 3 point. I tried the other settings and nothing. PTO was operating normal, as was and is the tractor. So, I drug the bush hog back to the shed on its skids, disconnected it, and drove the tractor to the garage for diagnosis. There is plenty of hydraulic oil, in fact it looks like I overfilled it last time I replaced the filter and cleaned the screen (possible cause to issue?).
The new hydraulic pump I installed several months ago seems to be working as the brakes are nice and stiff, and when I look into the hydraulic oil fill port I can see hydraulic oil squirting onto the final drives. Furthermore, after letting it idle the rock shaft did function and raise. Not sure, but this may have only occurred after I screwed down all the way the drop rate control as prescribed in the Technical Manual. However, when I opened it back up the shaft did not lower at the usual speed. Many minutes later I noticed it did eventually lower. I removed and inspected the drop-rate control thingy as prescribed, but did not see anything obviously wrong. No obvious leaks anywhere.
Does this sound like a clogged transmission oil filter? Transmission oil pump? A dump valve issue? A rock shaft seal issue?
As always, any help is much appreciated.
The new hydraulic pump I installed several months ago seems to be working as the brakes are nice and stiff, and when I look into the hydraulic oil fill port I can see hydraulic oil squirting onto the final drives. Furthermore, after letting it idle the rock shaft did function and raise. Not sure, but this may have only occurred after I screwed down all the way the drop rate control as prescribed in the Technical Manual. However, when I opened it back up the shaft did not lower at the usual speed. Many minutes later I noticed it did eventually lower. I removed and inspected the drop-rate control thingy as prescribed, but did not see anything obviously wrong. No obvious leaks anywhere.
Does this sound like a clogged transmission oil filter? Transmission oil pump? A dump valve issue? A rock shaft seal issue?
As always, any help is much appreciated.