Mini-skid pulling to one side in reverse

Serf Life

Serf Life

Been here much more than a while
Location
Maine Island
2019 Sk800 1k hrs is tracking true going forward and pulling hard to the left in reverse. Called my dealer at JESCO and checked the adjustment screws for the dual-stick controls with no improvement. Dealer is hrs away and local hyd shop is always swamped. Thoughts??
 
Serf Life said:
2019 Sk800 1k hrs is tracking true going forward and pulling hard to the left in reverse. Called my dealer at JESCO and checked the adjustment screws for the dual-stick controls with no improvement. Dealer is hrs away and local hyd shop is always swamped. Thoughts??
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Did you eliminate any mechanical failures, or are you certain it's hydraulic?
 
Serf Life said:
On the ditch witch it’s all hydro past the lever it seems

maybe 1/3 more

that was my thought but read that a bad motor would effect forward and reverse?
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Unless you losing hydro pressure from significant leak from that reverse line I’ll stick to unfortunately the motor is going bad if you keep running it long enough the front will act up as well I’d bet
but don’t take the chance because if you let it go and it wrecks the main drive pump with debris from the track motor it’s a large repair bill where as the 1 drive motor is 800 bucks and couple hours to change out.
 
Did it happen over a short time?

Instantally?

Can you correct for it with adjustments? or is it out of that range?

It could be adjustments or it could be a failure.
 
I’ve had pebbles fall into the linkage on my bobcat excavator, couldn’t turn very far in one direction.
 
I’d take the track off after jacking up the mini and take a closer look at the motor. Pita diagnostic would be swapping the motors and see if the other side pulls.
 
No experience with that mini, but building off of what @evo said, you could find somewhere that the connections are close together and swap left and right hoses instead of swapping motors. If the problem persist on the left then it'd be in the motor or track. If the problem jumped to the right side itd be a control issue.
 
Don't know the plumbing but if the motor is simply two hoses, reverse the connections and see if the fwd/reverse difference follows the hose swap. Same idea upstream vs motor fault. I never played a hydraulic technician on tv

could be an under-load-only fault based on pressure-flow tradeoff which couldn't be easily bench tested. noticed load/speed effects on a kubota hydrostatic 4wd mower once, quite pronounced
 
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Good idea on swapping hoses, could even make a "jumper" hose if needed to test.

Does it act up consistently? Get worse when the fluid warms up, etc?
 
Z'sTrees said:
Good idea on swapping hoses, could even make a "jumper" hose if needed to test.

Does it act up consistently? Get worse when the fluid warms up, etc?
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Setting aside some time this weekend to dive into it more. It is consistent and no change with warm fluid. Have continued using it as we are swamped, and no noticeable difference since it started. Going to do a extra deep clean/inspect and see about swapping hoses, go from there. Totally different beast but I had a snow plow acting up on one side and it was a sticking relief valve
 
Update. Swapped the hoses, which was a total bear, and the drag switched sides. Pulling to the right in reverse but fine going forward.

Had a long talk with knowledgeable tech at the dealer in Mass, something in the main pump and they don’t do rebuilds $3.7k pump. They change both drive motors with a failed main pump and do a flush with two hyd fluid changes which costs $8-10k.

He recommended calling a local hydraulic shop and seeing if they can rebuild it but has heard that it is an uncommon one to rebuild. All the work at their shop would be under a 1 yr warranty.
 
Serf Life said:
Update. Swapped the hoses, which was a total bear, and the drag switched sides. Pulling to the right in reverse but fine going forward.

Had a long talk with knowledgeable tech at the dealer in Mass, something in the main pump and they don’t do rebuilds $3.7k pump. They change both drive motors with a failed main pump and do a flush with two hyd fluid changes which costs $8-10k.

He recommended calling a local hydraulic shop and seeing if they can rebuild it but has heard that it is an uncommon one to rebuild. All the work at their shop would be under a 1 yr warranty.
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Sorry to hear
 
Buy the pump and swap it yourself, save six grand. It will be tight and a pain in the ass but it is doable. Stubby wrenches, rags, floor dry, two cases of break cleaner, colored tape/zip ties/paint (for marking line locations). I recommend staying sober during the wrenching it will cut down on the swearing and possibility of thrown wrenches.
 
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