Hydraulic (bucket) throttling

Bugzilla46310

Member

Equipment
2022 BX2680 198? AC 916H
May 22, 2022
46
49
18
Demotte, IN
The bucket on my 2680 is extremely touchy. Seem like it is full go or stop. Other tractors I have had you could operate the bucket much more smoothly very easy. Is there anything you can do to the hydraulic valve to get a smoother operation?
 

Mark_BX25D

Well-known member

Equipment
Bx25D
Jul 19, 2020
736
432
63
Virginia
I have the same question for my backhoe main boom. Up or down, left or right, it's VERY touchy. The dipper and bucket do not have that problem.
 

Grandad4

Member
Apr 5, 2016
163
5
18
Greensboro, NC
The BX models all have a pretty small hydraulic pump. At full operating rpm you get maximum flow but the output drops off at slower engine speed. If things are too jumpy, try slowing down the engine before looking for more complex solutions.
 

Mark_BX25D

Well-known member

Equipment
Bx25D
Jul 19, 2020
736
432
63
Virginia
The BX models all have a pretty small hydraulic pump. At full operating rpm you get maximum flow but the output drops off at slower engine speed. If things are too jumpy, try slowing down the engine before looking for more complex solutions.

But Scotty, I need more POWER! 🤪


Seriously, if I have to slow it down to get it to work decently, that's a design flaw. I would love to find a way to adjust it.
 

TheOldHokie

Well-known member

Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
Apr 6, 2021
2,578
1,159
113
Myersville, MD
But Scotty, I need more POWER! 🤪


Seriously, if I have to slow it down to get it to work decently, that's a design flaw. I would love to find a way to adjust it.
The metering performance of spools in DCVs is primarily a function of gland overlap and edge design. You typically pay more for valves that provide better control of metering but it often comes at the cost of increased spool leakage. Somebody in engineering/purchasing made a cost/benefit decision and AFAIK short of replacing the valve with a better one you are stuck with it.

Dan
 
  • Like
Reactions: 1 user

Grandad4

Member
Apr 5, 2016
163
5
18
Greensboro, NC
But Scotty, I need more POWER! 🤪


Seriously, if I have to slow it down to get it to work decently, that's a design flaw. I would love to find a way to adjust it.
The way to adjust it is with the throttle. You don't need to operate at max rpm all the time. You don't want to putt-putt around at ldle either. The best engine speed varies from task to task.

The BX is admittedly a very small tractor built to meet a particular price point, and it is not as sophisticated as larger, more costly tractors. But it can do an amazing amount of work, particularly in the hands of an operator who has learned how to get the most out of it.
 

Mark_BX25D

Well-known member

Equipment
Bx25D
Jul 19, 2020
736
432
63
Virginia
The way to adjust it is with the throttle. You don't need to operate at max rpm all the time.

When I'm trying to dig in hard soil and deal with roots, I need everything it has to offer. Reaching back to adjust the throttle for every swing of the backhoe is not exactly a practical solution.
 

Mark_BX25D

Well-known member

Equipment
Bx25D
Jul 19, 2020
736
432
63
Virginia
The metering performance of spools in DCVs is primarily a function of gland overlap and edge design. You typically pay more for valves that provide better control of metering but it often comes at the cost of increased spool leakage. Somebody in engineering/purchasing made a cost/benefit decision and AFAIK short of replacing the valve with a better one you are stuck with it.

That's pretty much what I figured, but it's nice to have knowledgeable input. (y)
 

Crash277

Well-known member

Equipment
BX23S
Jan 17, 2021
779
572
93
Canada
I can operate mine at full rpm with no problem. But not until I had lots of seat time. I slowly worked up the rpms while getting used to the machine. Rarely is it jerky any more.
 
  • Like
Reactions: 1 user

0xACE

New member

Equipment
BX1500, BX23S
Jul 16, 2022
27
21
3
Maine
I just recently moved to a 2022 BX23S from a 2003 BX1500. I was very fluid with the BX1500 after ~20 years of seat time. The "curve" of the stick is different with the BX23S so my work is also a bit herky-jerky as well. Figuring as stated here, I just need more time working with the new girl to get my motions just how she likes them.
 

fried1765

Well-known member

Equipment
Kubota L48 TLB, Ford 1920 FEL, Ford 8N, SCAG Liberty Z, Gravely Pro.
Nov 14, 2019
1,442
1,045
113
Eastham, Ma
When I'm trying to dig in hard soil and deal with roots, I need everything it has to offer. Reaching back to adjust the throttle for every swing of the backhoe is not exactly a practical solution.
A nice, new, or used L47 TLB would solve your issues.
The L47 has 3 hydraulic pumps!
I have a 2006 L48 TLB which also has 3 pumps.
 
  • Like
Reactions: 1 user

Dustyx2

Active member

Equipment
BX22, M7060, Landpride RC-2512, Woodmax SB84
Feb 19, 2021
110
27
28
NE Wyoming
Combining boom and swing motions makes it more manageable.
 
  • Like
Reactions: 1 user

Vigo

Active member

Equipment
B6100, B8200
Jan 9, 2022
138
60
28
San Antonio Texas
You can install adjustable restrictors inline on those circuits if you want to, but they do put some heat into the fluid. Some adjustable restrictors offer adjustable flow in one direction and free flow in the other direction, which you may find useful. For example, i would like all buckets to have the option to go fast in at least one direction so you can 'shake' sticky clumps off the bucket when needed. You would also need two such valves if you wanted to adjust the speed to be different in each direction.

Some backhoes have non-adjustable forms of these restrictors from the factory. I found and repaired some such factory restrictors and posted about it in this thread, post #10: Backhoe swing speed restrictors

The idea for restricting bucket movement would be the exact same, just placing the restrictors in a different set of hydraulic lines.
 
  • Like
Reactions: 1 users