So with my 2017 SVL95-2S I'm having hydraulic drive issues. When moving forward in normal mode, I have to compensate steering occasionally to remain on a straight path. When I switch to fast (rabbit) mode, this gets wildly worse. I'm afraid I have a hidden issue developing. Anyone else experience this? Thanks
SVL95-2S Drive and Hydraulics
- Thread starter Gov
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GreensvilleJay
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BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
OK, I don't have your machine or worked on it, but ...........FWIW.........
You've probably got two hydraulic motors being controlled by two spool valves with separate linkages. There's a lot of 'little' things that can cause one side to go faster than the other. You mention 'going forward', so it doesn't happen in reverse ? If true, then it shouldn't be a motor issue, perhaps just an adjustment of 'linkage' on one of the levers/valve. If levers are mechanically connected to valves, tierod ends can be adjusted, if cable connected, well, cables do stretch over time and use, again, should have some adjustments on the ends( like bicycles).
It'd be a good idea to get the WSM........
You've probably got two hydraulic motors being controlled by two spool valves with separate linkages. There's a lot of 'little' things that can cause one side to go faster than the other. You mention 'going forward', so it doesn't happen in reverse ? If true, then it shouldn't be a motor issue, perhaps just an adjustment of 'linkage' on one of the levers/valve. If levers are mechanically connected to valves, tierod ends can be adjusted, if cable connected, well, cables do stretch over time and use, again, should have some adjustments on the ends( like bicycles).
It'd be a good idea to get the WSM........
North Idaho Wolfman
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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
The Only thing you said that means anything!
Everything else was complete run around for the OP!
North Idaho Wolfman
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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
There are several components that can affect drive speed.
The Drive motor
It could be having a mechanical issue with that drive like a bad track roller.
The HST unit
The electronics that control the HST.
I do believe there is an electronic adjustment for speed differential or ballance on the HST output so the motors travel at same speed.
Get the WSM as it will have a troubleshooting info in it!
GreensvilleJay
Well-known member
Equipment
BX23-S,57 A-C D-14,58 A-C D-14, 57 A-C D-14,tiller,cults,Millcreek 25G spreader,
re: Everything else was complete run around for the OP!
please explain how a hydraulic motor, can go faster one way than the other
please explain how a hydraulic motor, can go faster one way than the other
North Idaho Wolfman
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Lifetime Member
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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
I'm pretty sure I did in my message to the OP.
The drive motors are controlled by an HST Unit, that is controlled by a computer.
They are NOT controlled by a spool valve with a mechanical linkage operating a spool valve.
The HST is a mutiple output unit that essentially controls each motor independently and can balance the loads independently.
Thanks for the response to my issue. Can you help me out with WSM and HST? I'm not as versed on the lingo as you guys
Check your track adjustment.
WSM = Work Shop Manual - it will tell you what you need to know and diagnose issues
WSM = Work Shop Manual - it will tell you what you need to know and diagnose issues
North Idaho Wolfman
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Staff member
Lifetime Member
Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
whitetiger
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Kubota tech..BX2370, RCK60, B7100HST, RTV900 w plow, Ford 1100 FWA
SVL- Series; SVL Straight Travel Diagnostics Purpose:
Diagnosing tracking issues with SVL95-2 and similar models (Pressure and flow values should be checked per the WSM for each model)
Theory:
This is to be used when the machine exhibits issues tracking one direction or the other over a short travel distance. It can also be used for machines that seem weak on one side or stalls one side before the other.
Troubleshooting/Procedure: Procedure 1:
Perform HST Start Point Procedure Performed in Machine Dash
1. Enter service mode by turning the key switch to [RUN] while pressing down SW1.
2. Use SW1/SW2 to scroll up and down through the dash menu, long-press SW1 on No-05
3. Start the engine, and set the engine speed to approx 1150 ±100 rpm.
4. Press the hydraulic unlock switch and move the machine to flat ground.
5. Stop moving and long-press SW-1. Display “set-3”, and operate the pilot lever to the Forward travel position.
6. As soon as the machine starts to move depress SW1.
7. After doing so the display will read “set-2” and “set-1” , you will want to perform the same procedure again moving the pilot lever forward and depressing SW1.
8. Once completed, the unit will display “OFF” and turn the key switch to "STOP" to complete the setting.
9. Test drive to check for improvement. If no resolution, move to Procedure 2.
SW1 = Top push button switch
SW2 = Center push button switch
SW3 = Bottom push button switch
Diagnosing tracking issues with SVL95-2 and similar models (Pressure and flow values should be checked per the WSM for each model)
Theory:
This is to be used when the machine exhibits issues tracking one direction or the other over a short travel distance. It can also be used for machines that seem weak on one side or stalls one side before the other.
Troubleshooting/Procedure: Procedure 1:
Perform HST Start Point Procedure Performed in Machine Dash
1. Enter service mode by turning the key switch to [RUN] while pressing down SW1.
2. Use SW1/SW2 to scroll up and down through the dash menu, long-press SW1 on No-05
3. Start the engine, and set the engine speed to approx 1150 ±100 rpm.
4. Press the hydraulic unlock switch and move the machine to flat ground.
5. Stop moving and long-press SW-1. Display “set-3”, and operate the pilot lever to the Forward travel position.
6. As soon as the machine starts to move depress SW1.
7. After doing so the display will read “set-2” and “set-1” , you will want to perform the same procedure again moving the pilot lever forward and depressing SW1.
8. Once completed, the unit will display “OFF” and turn the key switch to "STOP" to complete the setting.
9. Test drive to check for improvement. If no resolution, move to Procedure 2.
SW1 = Top push button switch
SW2 = Center push button switch
SW3 = Bottom push button switch
