L3400 L2800 Position Control Valve Research

   / L3400 L2800 Position Control Valve Research #1  

Harvest Moon

Gold Member
Joined
Nov 16, 2007
Messages
357
Tractor
Kubota L3400 HST-F
Please, do your own research before acting on any of this information, I'm not guaranteeing that the numbers are accurate or that I typed them correctly.

Part numbers listed for position control valves, in the order they appeared in their respective tractor model or as a part of a draft control option:

L2900

31351-39600
31351-39603

L3000

31391-39000
31391-39002
31351-39603 When purchased with Draft Control

L3010

31351-39603
31351-39604

L3400

31391-39002
YR909-00100
31351-39604
31351-39604 When purchased with Draft Control

YR908-00102 VERY RECENT TBN user submitted valve upgrade

Summery, all of these models have ended up with either 31351-39603 or 31351-39604 and when I entered the former on an online parts website it told me the latter was the same valve. What this means to me is that those of us concerned about the L3400 and L2800's performance need to hear from owners of the other L models about how their 3 points perform... because, the L2900, L3000 and L3010 all have the SAME 3 point lowering speed adjustment knob.. the L3400's has some of the same parts, including the mounting housing but is missing a few that the other tractors have.. and several posters have stated that adjusting this knob has improved the performance of their L3400 and L2800's thee point hitchs.

It may be that a combination of valve 31351-30604 and replacing the lowering speed adjustment valve with TA040-34500 (if possible) may give Grand L performance to the L3400 and L2800... That said if L2900, L3000 and L3010 owners report that their valves perform like Teg's replaced valve,

YouTube - Kubota L2800 After Valve Replacement 3PH

then it's unlikely that the lowering speed adjustment valve has anything to do with it and valve 31351-39604 is probably the best practical solution to improving the L3400 and L2800's performance. If they report differently, it might be a worthy experiment to see if the other lowering speed adjustment valve can be fit to the L3400 and L2800, because swapping out this exposed $80 part may make a significant difference in performance... although thats just an speculative deduction and may not make any mechanical sense.

I also looked at the parts for the L3130 and it they do not appear to be readily compatible, I suspect the L3010 is the end of the line for compatibility.
 
 
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