I have noticed that recently, my 300X loader w/either pallet forks or buck, will "droop", in other words, either will roatate to a dump configuration. It's a slow creep, even when engine is running, and lift control is centered. The frame lift is ok, just the front end. Was disking last week, with pallet forks mounted. About every 10 minutes, I'd better roll them back or they would fall enough to catch the ground. Both bucket cylinders seem involved, in that at any given time, both cylinder rods will measure the same. So it doesnt seem to be one cylinder having a problem. What's taken place to cause this?
JD 300X loader problem.. 3320 tractor
- Thread starter sgtstew
- Start date
J_J
Super Star Member
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- Sep 6, 2003
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- 18,928
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- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
Piston seals in the cyl are probably shot. Probably not a spool problem. Does the relief activate when cyl are fully extended?
Even if one cyl is good, the pressure from the bad cyl could leak to the other side of the piston.
Even if one cyl is good, the pressure from the bad cyl could leak to the other side of the piston.
kennyd
Advertiser
JD has a published spec on leak down rates-as well as other OEM's also. Some leakdown is to be expected. Yours does not sound to bad just yet, but you may want to get some seal kits to have in stock for the future.
kennyd
Advertiser
Here is a good thread to read: http://www.tractorbynet.com/forums/hydraulics/122281-jd-hydraulic-cylinder-rebuild-help.html
JB4310
Super Member
Mine will leak down when not running, but not a noticeable amount when engine is on. I use forks and a home made man lift basket to do some pruning or painting etc. If I kill the engine with a guy working from the platform, I would have to restart every 10 minutes or so to level. If I leave the engine running usually don't have to level it in the time we might be working in one spot.
Sounds like OP's is leaking a little to fast?
JB,
Sounds like OP's is leaking a little to fast?
JB,
Red Horse
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- Deere 655ZTrak, Deere 4720 Cab, 400 X LT 155
How many hours do you have???
kennyd
Advertiser
The engine ON or OFF is irrelevant if the valve is in neutral. If the cylinder are leaking (internal bypassing I should say) then the engine running (pump pumping) has no effect if the valve is not activated.
JB4310
Super Member
I somewhat understand your logic Kenny, but I am quite certain about my observations. Are you saying that I should not be seeing what I am ? Or that there are different types of leak down?
JB.