Bobcat D7595 (75-95) Fault Code: Left Speed Sensor Reverse Direction
Also shown on the panel as 75-95 · Also called Drive Left Speed Sensor Reverse Direction
Left Speed Sensor Reverse Direction · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
D7595 (panel code 75-95) sets when the drive/drive plus controller sees the joystick calling for a left swash plate position in one direction, but the left speed sensor reports movement in the opposite direction. The machine keeps running in speed management mode, but the drive signal for the left side can't be trusted until this is fixed.
Medium severity. The machine stays operable in speed management mode after this code sets, so it is not an immediate shutdown situation. However, a reversed or unreliable left speed sensor signal means the controller cannot properly manage left-side drive speed, so it should be diagnosed before continued heavy use, especially on slopes or in tight maneuvering.
What does Bobcat error code D7595 mean?
D7595 is Bobcat's code for a left speed sensor reverse direction fault on the drive/drive plus system. The controller compares the joystick position (which tells it what direction and speed the left swash plate should be commanding) against the actual signal coming back from the left speed sensor. When those two disagree on direction, the controller flags D7595.
On wheeled machines, the speed sensor sits in the motor carrier and reads magnets on a rotating disk. On track machines, the sensor is in the drive motor and reads teeth on a metal sprocket. Either way, it's telling the controller which way and how fast that side is actually turning.
Despite the fault, the machine continues to operate in speed management mode, so the operator may not notice an immediate loss of drive, but the left-side speed feedback the controller relies on for smooth, accurate control is compromised.
Common causes of D7595
- Speed sensor installed incorrectly (often installed backwards or in a way that inverts the signal direction).
- Signal wires reversed or open. Depending on machine and harness variant, this involves wire pairs 3020/3880 and 3080/3885, or simply wires 3020 and 3080, or wires 3880 and 3885.
- Fault in the drive/drive plus controller itself.
- Moisture, corrosion, or pushed-back pins in the drive/drive plus controller connectors, the speed sensor connector, or wire harness connectors.
- Intermittent causes that are not present at the time of testing: loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat D7595: first checks
- Confirm the fault conditions: key switch/(run/enter) on, Press To Operate Loader (PTOL) enabled, engine running, and a drive command being given. These are the conditions Bobcat lists for the code to set.
- Inspect the left speed sensor's physical installation. Verify it is mounted correctly and was not installed backwards, which would reverse the direction signal.
- Check the relevant signal wire pair for your machine and harness (3020/3880 and 3080/3885, or 3020 and 3080, or 3880 and 3885) for reversed connections, opens, chafing, or damage.
- Inspect the drive/drive plus controller connectors, the speed sensor connector, and wire harness connectors for moisture intrusion, corrosion, or pins that have been pushed back out of their sockets.
- If the code is not currently active and appears intermittent, treat loose connections, corrosion, pushed-back pins, the controller, and the harness as the probable suspects, and recheck connectors thoroughly since the root cause may not show up on a single test.
- Test or swap the drive/drive plus controller if wiring and sensor checks come back clean, since the controller itself is listed as a possible cause.
How the code clears
Bobcat's listed method to clear D7595 once the repair is complete is to cycle power on the machine. No separate reset procedure or software step is listed beyond turning the key off and back on after the fix.
Affected models and serial ranges
D7595 appears in our records across 16 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| S510 | SN A3NJ11001-99999, SN A3NK11001-99999, SN ATZC11001-ATZC99999 |
| S530 | SN A7TV11001-99999, SN ATZD11001-99999 |
| S550 | SN A3NK11001-A3NL99999, SN A3NM11001-99999 |
| S570 | SN A7U711001-799999, SN A7U811001-899999 |
| S590 | SN ANMN11001-99999, SN ANMP11001-99999 |
| S630 | SN A3NT12370-99999, SN A3NU11001-11111, SN A3NU11112-99999 |
| S650 | SN A3NV11001-13098, SN A3NV13099-99999, SN A3NW11001-11248 |
| S750 | SN A3P211001-299999 |
| S770 | SN A39511001-99999, SN A3P411001-99999 |
| T550 | SN A7UJ11001-AJZV12276 |
| T590 | SN ALJU11001-999999, SN B37811001-999999, SN B3Z711001-999999 |
| T630 | SN A7PU11001-11663, SN A7PU11664-99999 |
| T650 | SN A3P012214-099999, SN A3P111242-199999 |
| T750 | SN ANKA11001-A99999 |
| T770 | SN A3P811001-899999, SN A3P911001-999999 |
| T870 | SN A3PG11001-99999, SN A3PH11001-99999 |
Frequently asked questions
What does Bobcat code D7595 mean?
It means the drive/drive plus controller detected that the left speed sensor signal is moving in the opposite direction from what the joystick position and left swash plate command indicate. It's a direction mismatch fault on the left drive side.
Can I keep operating the machine with D7595 active?
The machine will continue to run in speed management mode after this code sets, so it is not a hard shutdown. That said, because the left-side speed feedback is unreliable, it's best to get it diagnosed rather than keep working normally, particularly in situations needing precise or balanced drive control.
What is the panel/numeric form of this code?
D7595 displays on some panels as 75-95.
Where is the left speed sensor located on my Bobcat?
On wheeled machines, it's in the motor carrier and reads magnets on a rotating disk. On track machines, it's in the drive motor and reads teeth on a metal sprocket.
Which wires should I check for D7595?
Depending on the machine and harness configuration, check wire pairs 3020/3880 and 3080/3885, or just 3020 and 3080, or just 3880 and 3885, for reversed connections or open circuits.
How do I clear D7595 after fixing the problem?
Cycle power on the machine. That is the only clearing step listed for this code.
Why does this code show up intermittently?
Intermittent D7595 faults are often caused by loose connections, corrosion, or pushed-back pins in the connectors rather than a constant wiring fault. If the code isn't active during testing, thoroughly recheck all connectors and the harness, since the cause may not be found on the first pass.