Bobcat D7555 (75-55) Fault Code: Right Forward Drive Solenoid Error Off
Also shown on the panel as 75-55 · Also called Drive Right Forward Drive Solenoid Error Off
Right Forward Drive Solenoid Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat code D7555, shown on some panels as 75-55, sets when the drive or drive plus controller commands the right forward drive solenoid but does not detect voltage through it. The machine drops into speed management mode until the fault is fixed and power is cycled.
Medium severity. The machine keeps running but is limited to speed management mode, which restricts drive performance. It is not an immediate safety shutdown, but travel control is affected, so it should be diagnosed before continued heavy use.
What does Bobcat error code D7555 mean?
D7555 is set by the drive or drive plus controller when it sends a command to the right forward drive solenoid but does not see the expected voltage return on that circuit. The controller normally varies voltage to the drive solenoids based on joystick signal input, so this solenoid is part of how the machine translates joystick movement into forward travel on the right side.
When the controller cannot confirm the solenoid is responding, it cannot trust that command, so it puts the loader into speed management mode as a protective response. This limits how the machine drives until the underlying wiring, solenoid, or controller issue is resolved.
Common causes of D7555
- Signal wire 4260 or ground wire 2660 shorted to ground or open
- Faulty right forward drive solenoid
- Faulty drive or drive plus controller
- Moisture, corrosion, or pushed back pins in the drive or drive plus controller connectors, the right forward drive solenoid connector, or the AWS/SJC wire harness
- Intermittent condition from loose connections, corrosion, pushed back pins, the controller, the wire harness, or a combination of these problems, which may not be found if the code is not active at the time of testing
How to troubleshoot Bobcat D7555: first checks
- Confirm the code is active: key switch/run-enter on, PTOL enabled, engine running, and a forward drive command given, since these are the conditions under which the controller checks for this fault
- Inspect the right forward drive solenoid connector and the drive/drive plus controller connectors for moisture, corrosion, or pins that have pushed back out of position
- Trace signal wire 4260 and ground wire 2660 for shorts to ground or open circuits
- Check the AWS/SJC wire harness connectors along the run for chafing, corrosion, or loose pins
- Test the right forward drive solenoid itself for proper operation if wiring and connectors check out
- If the code is not active during testing, treat it as intermittent and recheck all connections, since the cause may not be identifiable until it recurs
How the code clears
Once the repair is complete, cycle power to clear the code. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
D7555 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 D7555 mean?
It means the drive or drive plus controller commanded the right forward drive solenoid but did not detect voltage through it, so the controller cannot confirm the solenoid responded as expected.
What is 75-55 on a Bobcat panel?
75-55 is the numeric panel display form of code D7555, the right forward drive solenoid error off fault.
Can I keep operating the machine with D7555 active?
The loader will operate, but it drops into speed management mode, which limits drive performance. It is best to diagnose and repair the issue rather than continue working in this limited mode.
What usually causes D7555?
Common causes include a short to ground or open in signal wire 4260 or ground wire 2660, a bad right forward drive solenoid, a faulty drive or drive plus controller, or moisture and corrosion in the related connectors and wire harness.
How do I clear D7555 after repair?
Cycle power to the machine. No other clearing procedure is listed.
Why can't the technician find the cause of my D7555 code?
If the code is intermittent and not active when tested, the exact cause may not show up. Loose connections, corrosion, pushed back pins, the controller, or the wire harness are all possible intermittent causes that need repeated checks to catch.
What conditions have to be true for D7555 to set?
The key switch or run/enter must be on, PTOL must be enabled, the engine must be running, and a forward drive command must be given.