OK. then how about this:
In reference about the QD's. The qd's on my older JD batwing and the qd's onmy much newer NH tractor mated up perfectly.... Different manufacturer I'll wager too. That just goes to show you that as long as the QD manufacturer builds the mating surfaces to correct spec... you can expect them to work. That tells me the tolerance is off on the chineses qd.. OR it is not a direct compatible part.. but rather.. can only be mated to it's manufacturers part... that's either an assembly line issue at the QD plant.. or a local standard / money saving feature at the tractor plant, IMHO..
As for the relief. Well.. if the chinese are not building these setups with a FEL in mind.. then whey are there QDS betweent he pump and relief in the first place. I've seen lots of jinma between nortrac, homier, and independednt dealers.. I've not seen one that didn't have the qd at the hyd pump. I really doubt it is the dealers on this side that are adding them all.. Many o fthe independent dealers i talked too were just landscapers or business owners who picked up the line for extra money.. have no idea about anything to do with them.. including the name of the machine or the engine manufacturer,.. I just don't see those guys going out and modifying the hyd system.. vs.. just getting it that way out of the crate or shipping container.. etc.
Comments on that from dealers? do they come like that.. or is ever one modifed by adding a qd inline with the hyd pump.. then you dispose of the original hyd line? e tc? How about it?
Should, would, could, .. that said.. I think it'sfairly obvious we see lots of hyds problems on this fourm that most likely lead back to a pair of qd's not passing oil..
One dealer I spoke to here, said he did offer a retro kit to add the relief.. but it added about 200$ tot he tractor price.. and the purchasers.. who were buying a economy tractor anyway would scoff at it... etc.
IMHO.. just putting on a good pair of QD's.. for probably a quarter of that price seems like it would solve 75% of the problems.. that and 50 cents worth of zip ties.. etc.
Another idea would be to have the pump plumbed directly to a set of aux remotes, and then tap pressure from there.... and have a relief/ detent resetting valves there. My NH has this feature. I fthe relief deadheads the spoolm resets to neutral. I like that. i can lift my SA cyl's without eqgle eye'ing them to find max travel... the system detects the pressure buildup and resets the spool with relief action.. etc.
Again though.. the more you overtick the plumbing.. the less of an economy tractor it is..
Another option is to plumb the hyd pump directly to the hyd 3pt top cover.. and make provisions for the remote ports built in tot he top cover, with system relief servicing all ports.. including 3pt. My older fords use this method.. I have a 660 that has aux hyd spool taps of fthe hyd top cover. pump supplies oil to the 3pt and remotes, and has 1 relief. Incedentally.. I have loader on that tractor.. has SA lift cyls', and DA curl/dup cyls.. works great.. and I don't worry about the qd's from the spoolset tot he loader cyls coming loose and smoking hundreds of dollars worth of components...
Soundguy
GuglioLS said:
Yo Soundguy, I am not going to let that blanket statement go unchallanged-
The Chinese QD's are not poor fitting - when mated with another Chinese QD. The problem comes in when someone tries to install a FEL with a non Chinese QD. The dealers who know what they are doing will make sure to configure the QD's so that both mating parts of the QD are from the same manufacturer. Simple Logic.
Now, as far as a relief valve -
The Chinese have not caught on in that area yet- too busy making money on hydraulic pumps? But in all fairness, the origional hydraulic design was not configured for a FEL so the relief valve was, and still is, inside the TPH hydraulics lift box.
IMHO - Any (knowledagable) dealer should know this and SHOULD offer the end customer the option to install a post pump relief valve. And if not, educate the customer on what can happen.