GreatWhitehunter
Veteran Member
This will be a FYI to others so you guys can benefit from my findings. About
3yrs back I added a 448 hoe to my 3320. The dealer did all the install and added the Power Beyond. About a month later I was having rockshaft issues. While loaded with an implement it would constantly slowly lower and then try to recover. It was under warranty so I let the dealer handle the repairs.
When it returned the dealer said they replaced the rockshaft valve itself.
I didn't ask anymore questions. Shortly after the warranty expired I was harley raking and couldn't seem to get the grade I was after. Again the 3 pt hitch was falling and raising. What I found was the sintered filter in the PB circuit had failed and broke in pieces. I ended up pulling the rockshaft valve apart and found nothing but after reassembling everything worked. I've since done 3 Hygard changes and replaced all three filters.
Which brings me to today, I head out to do some boxblading and raise the hitch control handle. No movement of the hitch what so ever. So I check all the usual suspects. Linkages,oil level etc and find nothing. I pulled the PB sintered filter to make sure it was intact. It was but the filter chamber was not filled with hygard. So I knew the issue was before it in the rockshaft assembly. So after the disassembly I find a small piece of the sintered filter jammed in a port of the valve. It was blocking the shuttling of the spool itself. I was relieved to find no damage to the shuttle itself. This piece of debris was obviously floating around in the circuit all this time since the current filter is intact. I'll post some pics in the am. If anyone has details on cutting and pasting from the JD parts site please PM with the instructions.
Matt:thumbsup:
3yrs back I added a 448 hoe to my 3320. The dealer did all the install and added the Power Beyond. About a month later I was having rockshaft issues. While loaded with an implement it would constantly slowly lower and then try to recover. It was under warranty so I let the dealer handle the repairs.
When it returned the dealer said they replaced the rockshaft valve itself.
I didn't ask anymore questions. Shortly after the warranty expired I was harley raking and couldn't seem to get the grade I was after. Again the 3 pt hitch was falling and raising. What I found was the sintered filter in the PB circuit had failed and broke in pieces. I ended up pulling the rockshaft valve apart and found nothing but after reassembling everything worked. I've since done 3 Hygard changes and replaced all three filters.
Which brings me to today, I head out to do some boxblading and raise the hitch control handle. No movement of the hitch what so ever. So I check all the usual suspects. Linkages,oil level etc and find nothing. I pulled the PB sintered filter to make sure it was intact. It was but the filter chamber was not filled with hygard. So I knew the issue was before it in the rockshaft assembly. So after the disassembly I find a small piece of the sintered filter jammed in a port of the valve. It was blocking the shuttling of the spool itself. I was relieved to find no damage to the shuttle itself. This piece of debris was obviously floating around in the circuit all this time since the current filter is intact. I'll post some pics in the am. If anyone has details on cutting and pasting from the JD parts site please PM with the instructions.
Matt:thumbsup:
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