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Slow bucket / hydraulics - B7200D

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BlownL67

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Discussion starter · #1 ·
We've been getting hammered here in Massachusetts this winter and I've been working my Gravely's and Kubota quite a bit. Anywho, since I got the tractor a few years ago, I noticed the hydraulics were a little slow. Right after I purchased the machine, I replaced all the lines (rubber/metal) on the 1630 bucket and controls. Along with the lines, I did a full fluid/filter screen change and swapped over to SUDT. Everything is nice and tight and there are no leaks, but over time it seems like my bucket has really slowed to a snails pace when I am trying to operate it. The only way I can really get the bucket / loader to move is to basically lay on the gas pedal and let it work very slowly. This afternoon I had to do a quick emergency lift of one of my Gravely tractors into the back of my truck so I strapped it to my bucket and had to sit there for about 5 minutes with my foot on the gas pedal until my loader finally got to about 4' up in the area so I could self load the machine. The only part that comes to mind is the hydraulic pump. I know its a pretty expensive part, but if it fixes my problem, I'll gladly drop the money in a second! I bought the machine with 286hrs, and I'm up to 306 in the past 2yrs so I really don't rack up much for hours at all.

Any help or advice would be appreciated!


- Mark
 
#2 ·
When your loader is operating slowly, take a look for tiny air bubbles in the hydraulic fluid.

I had a similar problem with a Kubota hydrostat, and I found that the pump was pulling air into the system through a leaking suction connection. I fixed this problem, and it has worked wonderfully ever since.

Other things to look at: Suction screen??, Hydraulic filter?? Hydraulic fluid level with loader cylinders stroked out?? Breather hole in filler cap??
 
Discussion starter · #3 ·
Good advice! I'll keep an eye out for bubbles.

There is no filter for my tractor, but I did replace the old screen with a new screen when I got the machine and flushed out the old hydraulic fluid. I guess I will need to find a way to test the pressure output from the pump.
 
#5 · (Edited)
BlownL67 said:
Good advice! I'll keep an eye out for bubbles.

There is no filter for my tractor, but I did replace the old screen with a new screen when I got the machine and flushed out the old hydraulic fluid. I guess I will need to find a way to test the pressure output from the pump.
Click to expand...
I have a B7100 and I know my tractor has a hydraulic filter, that is located under a sheet metal cover between your legs. Messick's lists a hydraulic filter under B7200 parts. Just a thought.

Respectfully,

Ken Erickson
 
#6 ·
Do you hear a whistling or hissing sound while it's struggling to move? I ask as a leaky bypass (pressure relief) valve would also slow you down and make the movements quite weak.
 
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Discussion starter · #7 ·
ken erickson said:
I have a B7100 and I know my tractor has a hydraulic filter, that is located under a sheet metal cover between your legs. Messick's lists a hydraulic filter under B7200 parts. Just a thought.

Respectfully,

Ken Erickson
Click to expand...
Thanks for the reply. HST tractors have filters, but non HST tractors like mine do not have them.
 
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