Bobcat D7527 (75-27) Fault Code: Left Swash Plate Out of Position
Also shown on the panel as 75-27 · Also called Drive Left Swash Plate Out of Position, Left Swash Plate Out Of Position
Left Swash Plate Out of Position · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
D7527 (panel code 75-27) sets when the drive or drive plus controller sees the left swash plate sitting opposite of where it commanded, or the sensor feedback isn't in the neutral range of 2.08 to 2.92 volts when neutral is expected. The engine shuts down when this code sets.
High severity. This code shuts down the engine when it sets, which stops the machine mid-operation. It is not immediately damaging by itself, but it takes the machine out of service and points at possible hydraulic pump, sensor, solenoid, or wiring problems that need to be sorted before returning to work.
What does Bobcat error code D7527 mean?
D7527 is a Bobcat drive/drive plus controller fault tied to the left swash plate inside the left drive pump. The swash plate angle controls the direction and rate of hydraulic flow to the left drive motor, which is how the machine's left track or wheel set moves forward, reverse, or sits in neutral. Sensors mounted at the bottom of the pump, keyed to the swash plate itself, report its actual position back to the controller.
The controller commands a swash plate position based on operator input through the joystick or drive controls. If the sensor feedback reports the plate sitting opposite of what was commanded, or if the controller expects neutral but the feedback voltage isn't in the 2.08 to 2.92 volt neutral window, it sets D7527 and shuts the engine down as a safety response.
The swash plate sensors get their supply voltage from the gateway controller, and their output signal normally ranges from 1.0 to 4.0 volts across full swash plate travel. This makes the sensor circuit itself, and the wiring feeding it, a common point of failure worth checking early.
What triggers a Bobcat D7527 code?
D7527 sets when the drive/drive plus controller detects the left swash plate position is opposite of the commanded position, or when the controller expects the swash plate to be in neutral and the sensor feedback voltage is not within 2.08 to 2.92 volts. The code is checked when the PTOL button is pressed with the seat bar down, and the controller continues monitoring the sensors throughout operation. Conditions for the code to be active are: key switch/run-enter switch on, PTOL enabled, and engine running.
Common causes of D7527
- Contamination of the hydraulic system.
- Hydraulic pump not physically centered.
- A faulty left swash plate sensor.
- Left drive solenoids not properly connected.
- Left forward drive solenoid or left reverse drive solenoid shorted to supply voltage or to ground. Check for additional codes D7543, D7544, D7553, D7554, and D7575 if this is suspected.
- A fault in the drive/drive plus controller itself.
- Moisture, corrosion, or pushed-back pins in the drive/drive plus controller connectors, the swash plate sensor connector, or the AWS/SJC wire harness.
- If the code is intermittent and not present at the time of testing, the cause may not be found immediately. Probable causes in this case include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat D7527: first checks
- Inspect the drive/drive plus controller connectors, the swash plate sensor connector, and the AWS/SJC wire harness connectors for moisture, corrosion, or pins that have been pushed back out of their sockets.
- Check the left swash plate sensor wiring and connector for damage or looseness, since sensor feedback outside the 1.0 to 4.0 volt signal range or outside the 2.08 to 2.92 volt neutral window is central to how this code sets.
- Verify the left drive solenoids are properly connected and that neither the left forward nor left reverse drive solenoid is shorted to supply voltage or ground. Pull up any related codes (D7543, D7544, D7553, D7554, D7575) if present, since they point toward the same solenoid circuits.
- Check the hydraulic system for contamination, since dirty fluid can affect swash plate movement and sensor readings.
- Confirm the hydraulic pump is physically centered as part of a mechanical inspection if electrical checks come back clean.
- If the code appears intermittently and is not active during testing, recheck all connectors for loose connections, corrosion, or pushed-back pins before assuming the controller or harness itself has failed.
How the code clears
Once the repair is complete, clear D7527 by cycling power (turning the key switch off, then back on). No separate clearing step is listed beyond a power cycle.
Affected models and serial ranges
D7527 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 D7527 mean?
It means the drive/drive plus controller detected the left swash plate in the hydraulic drive pump sitting opposite of the position it commanded, or the swash plate sensor feedback wasn't within the 2.08 to 2.92 volt neutral range when the controller expected neutral. This shuts the engine down.
Why does the engine shut down when D7527 sets?
The swash plate position directly controls left-side drive direction and speed. If the controller can't confirm the swash plate is where it should be, it shuts the engine down as a safety measure rather than allow uncontrolled or unexpected drive motion.
What is the panel or numeric form of D7527?
The numeric panel display form of D7527 is 75-27.
Which Bobcat models can show D7527?
D7527 applies to Bobcat S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, and T870 models equipped with the drive/drive plus controller system.
Can I just clear D7527 and keep working?
You can cycle power to clear the code, but if the underlying cause (a bad sensor, contaminated hydraulic fluid, a shorted solenoid, or a wiring fault) isn't fixed, the code is likely to come back and shut the engine down again during operation.
Are there other codes I should check alongside D7527?
Yes. If a shorted left forward or left reverse drive solenoid is suspected, check for codes D7543, D7544, D7553, D7554, and D7575, since these are tied to the same drive solenoid circuits.
What if D7527 only happens sometimes and I can't find the cause?
Intermittent D7527 codes that aren't active during testing are harder to pin down. Likely causes include loose connections, corrosion, pushed-back pins in a connector, a failing controller, the wire harness, or some combination of these. A careful visual and continuity check of all related connectors is the best starting point.