We've had our B6200DT (manual trans) with B1630 fel since late '80's; it's my wife's tractor (750+hrs). Have WSM, tractor & loader Operator's manuals. Fel has never been off; there are no hydraulic line quick disconnects.
Recently one day, Honey says bucket was kind of jerky when lifting, then lifted slower and slower then next to nothing, all in fairly short order.
I dumped the tranny/hydraulic tank, examined the suction screen and fluid (clean and good) strained fluid & refilled. (As expected; have done this 3 times previous because machine moves snow when it's chilly, and fluid characteristics make huge performance difference: I know you all will be skeptical but Kubota SuperUDT2 is worth it's exorbitant cost in our conditions)
I replaced 2 rubber hose suction line sections: larger one connecting main suction line from tranny to suction side of hydraulic pump, and smaller one connecting "block type outlet direct acting relief valve" to suction side of pump. {this one was cracked, thought I was home free; no such luck}
With engine running (about 1300 rpm):
1) Loosened/tightened fel single lever control valve supply line (from "block type outlet") and a couple other connections. Fluid comes out But Doesn't Spray.
2) When loader control operated to raise bucket, cylinders seemed to slightly "bump" but nothing moves.
3) 3 point hitch will fully cycle; raise, lower, and hold position; however raising will cease when minimal resistance is applied.
4) With a lift and FEL control valve lever held in correct position, I completely cycled the 2 pairs of cylinders 3 or more times.
5) When bucket fully raised, control lever neutral, and lift lowered; bucket drops about 4" then holds.
6) Bucket will roll out (dump) but won't roll back without assistance, and when control lever in "roll back" position, bucket will slowly Roll Out. When control lever moved to neutral, the position holds.
7) Fluid can always be observed returning to tranny when filler cap is off; and will flow out of filler if engine is much above idle. I kept checking to see if the returning fluid looked cloudy (air getting sucked in somewhere) but it never did.
With engine off and bucket raised, bucket will very slowly bleed down, maybe a foot in 30 minutes; I'm guessing that's normal.
All this monkeying around definitely got some air out; I probably added about a quart of fluid. Didn't notice any coming out a vent.
Unfortunately this didn't really change anything.
Since I fully cycled all the cylinders at least a few times, I'm guessing more of the same won't solve the problem...
++++++++!!!
WHEw! That was a really boring account of this amateur adventure…
Here's hoping someone's Still Awake!
++++!!!
I've been trying to convince myself there's a pressure relief valve or some such that's stuck partially open, but my amateur diagnostics keep pointing to the hydraulic pump and/or the "block type outlet",,,
Can anyone think of any other possibilities?
Something else I should check out?
If it is the pump, is there a reasonable chance I'll just need O rings and an oil seal? Or should I plan on coughing up for another pump?
There is a dealer here, but, Yikes!
Any recommendations for other parts sources?
Sincerely appreciate any suggestions / advise!
Tnx!
rB
Recently one day, Honey says bucket was kind of jerky when lifting, then lifted slower and slower then next to nothing, all in fairly short order.
I dumped the tranny/hydraulic tank, examined the suction screen and fluid (clean and good) strained fluid & refilled. (As expected; have done this 3 times previous because machine moves snow when it's chilly, and fluid characteristics make huge performance difference: I know you all will be skeptical but Kubota SuperUDT2 is worth it's exorbitant cost in our conditions)
I replaced 2 rubber hose suction line sections: larger one connecting main suction line from tranny to suction side of hydraulic pump, and smaller one connecting "block type outlet direct acting relief valve" to suction side of pump. {this one was cracked, thought I was home free; no such luck}
With engine running (about 1300 rpm):
1) Loosened/tightened fel single lever control valve supply line (from "block type outlet") and a couple other connections. Fluid comes out But Doesn't Spray.
2) When loader control operated to raise bucket, cylinders seemed to slightly "bump" but nothing moves.
3) 3 point hitch will fully cycle; raise, lower, and hold position; however raising will cease when minimal resistance is applied.
4) With a lift and FEL control valve lever held in correct position, I completely cycled the 2 pairs of cylinders 3 or more times.
5) When bucket fully raised, control lever neutral, and lift lowered; bucket drops about 4" then holds.
6) Bucket will roll out (dump) but won't roll back without assistance, and when control lever in "roll back" position, bucket will slowly Roll Out. When control lever moved to neutral, the position holds.
7) Fluid can always be observed returning to tranny when filler cap is off; and will flow out of filler if engine is much above idle. I kept checking to see if the returning fluid looked cloudy (air getting sucked in somewhere) but it never did.
With engine off and bucket raised, bucket will very slowly bleed down, maybe a foot in 30 minutes; I'm guessing that's normal.
All this monkeying around definitely got some air out; I probably added about a quart of fluid. Didn't notice any coming out a vent.
Unfortunately this didn't really change anything.
Since I fully cycled all the cylinders at least a few times, I'm guessing more of the same won't solve the problem...
++++++++!!!
WHEw! That was a really boring account of this amateur adventure…
Here's hoping someone's Still Awake!
++++!!!
I've been trying to convince myself there's a pressure relief valve or some such that's stuck partially open, but my amateur diagnostics keep pointing to the hydraulic pump and/or the "block type outlet",,,
Can anyone think of any other possibilities?
Something else I should check out?
If it is the pump, is there a reasonable chance I'll just need O rings and an oil seal? Or should I plan on coughing up for another pump?
There is a dealer here, but, Yikes!
Any recommendations for other parts sources?
Sincerely appreciate any suggestions / advise!
Tnx!
rB
