Tractortech
Member
- Location
- Cumbria
YesDoes the cab have to be removed to access transmission pump ?
YesDoes the cab have to be removed to access transmission pump ?
So far the intermittent problem has not come back.....fingers crossed..
I have a question about plumbing in the hydraulic motor for the winch.
I was about to pinch the transmission bowl with return fitting, pipes and closed centre spool off my 1140 in order to do so.
BUT having studied the 2850- it has two double acting spools with the return plumbed through a separate canister filter then straight back to the hydraulic reservoir above the pump - surely I can just run the motor off the spool since it will be pumping straight back to the resevoir? - or am I mistaken?
Can you elaborate on that....? The return pipework definitely looks like it goes straight back to the hydraulic reservoir..your mistaken !.
Not technically back to the reservoir as I recall, but to the pump inlet. Maybe the use of this filter as a return path isn't advised as it has various flow restrictions hence the recommended route via the filter bowl on the transmission filter.Can you elaborate on that....? The return pipework definitely looks like it goes straight back to the hydraulic reservoir..
sounds like rockshaft lift sealsSo the tractor has been doing a bit of work for me now, with no repeat of the complete loss of hydraulics thank god...
The one repeatable issue I have is that once warm the lift arms will slowly drop when it's idling, and the oil pressure light will come on (Hi Lo still works though). If I give a bit of revs they'll pick back up and when it comes back down to idle they stay up ok.
The lift arms will drop straight away when I stop the engine every time.
Is this just the main seals in the rockshaft, or do I suspect the pump too? (destroke valve from what I've been reading?)
The pressure is 180 bar on the gauge on my crane spool block when I start from cold, and the hydraulics seem plenty strong enough.
BTW The winch is working fine on the spools....
It depends how fast the engine is running..Hi.
Maybe i must edit my previous post.
So... Does anyone knows how much is the hydraulic oil flow (lt/min) at the output of quick couplers of a JD2850 tractor with a 23cm3 pump ??
It depends how fast the engine is running..
However, I'd start a new thread of your own, with a good description of your problem..
Either you have an internal leak or your front pump is worn out and needs a rebuild. Could be something else entirely of course. I don’t think a good pump could sustain maximum output for long anyway, because the feed pump in the transmission can’t keep up. Cavitation and vibrating hydraulics are a clue to this.Hi.
All hydraulics works fine. The problem that i has is that the oil flow at quick couplers is 24Lt\min at 2000 rpm. John deere manufactor gives 34lt/min minimum flow for the pump of my tractor.
So.... where are the rest 10lt\min....