Backhoe 4400 tractor with backhoe

[Keoke]

You can buy two close nipples with that will thread into the turn hyd ram circuits. Drill and tap the nipples to take an Allan headed 1/8 inch pipe plug. Drill the plug to a smaller hole than the stock hole. Start small and work your way up to the turn speed you want. Remember that pressure hose on one turn becomes the return hose for the other turn. The restricted "go" and "open" return reducers are desinged to handle that problem and are probably the better way to go.
These restrictors would give a slow turn and a fast return to center. Reduced orfices should not be so small as to kick in the pressure relief valve in for this will heat up your hyd fluid.
Also, only if hyd pump flow capacity (gpm) is high enough will you be able to blow pressure relief valve off it's seat at low engine rpms. Most good and tight hydraulic systems will dump pressure (buzz) even at idle rpm.
Also, it is possible that the tractor relief valve has a LOWER setting than the back-hoe relief valve and dumps first. If this is the case, the hoe will not preform to factory specs which are based on the hoe's blow off setting.

george


<P ID="edit"><FONT SIZE=-1>Edited by keoke on 12/16/01 06:08 PM (server time).</FONT></P>

 

[jfakerj]

Keoke
For all I know there may be an adjustment on the jd47 bh also. Maybe in the controle valve itself. I'll have to run this by one of the mechanics at the deere dealer the next time I go out there.

Jerry

 

[jfakerj]

George
I guess if I were a little smarter I'd have seen that both these posts were from the same person. Oh well.
If there is no adjustment I'll probably look at going with restrictors. It sounds a lot easier to me.
Question - So I'd put one on each cylinder line (the stiff line when I push the handle one way) with the reduction going into the cylinder?

Jerry