Bobcat A8707 (87-07) Fault Code: ACD/RACD Output “H” Open Circuit
Also shown on the panel as 87-07 · Also called ACD Output ‘H’ Open Circuit
ACD/RACD Output “H” Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat code A8707, shown on some panels as 87-07, means the ACD/RACD controller cannot detect the solenoid wired to output "H" at controller pin J1 B-6. When this code sets, the controller disables output "H" until the open circuit is found and fixed.
Medium severity. Output "H" is disabled while the code is active, which will stop whatever attachment function that output controls, but it does not by itself indicate an engine, hydraulic pressure, or structural safety failure. Treat it as a functional fault to diagnose during the shift, sooner if the disabled function is needed for safe operation of the attachment.
What does Bobcat error code A8707 mean?
A8707 is an attachment control code tied to the ACD/RACD (attachment control device / remote attachment control device) controller. This controller sends commands to a set of solenoid outputs, one of which is labeled output "H" and connects at controller pin J1 B-6.
When the controller expects to see a solenoid connected to output "H" but the circuit reads open, it logs A8707 and shuts that output down as a protective measure. This prevents the controller from trying to drive a circuit that isn't completing, which could otherwise cause erratic behavior or wiring damage.
Because output "H" is disabled once the code is active, whatever attachment function is wired to that output will not work until the open circuit is repaired and the code is cleared.
Common causes of A8707
- Output "H" wiring open: a break in the wire from controller pin J1 B-6 to the solenoid, or an open in the output "H" ground wire.
- A failed output "H" solenoid (open coil).
- A fault in the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, the mainframe harness, the attachment control harness, or the output "H" solenoid connector.
- Intermittent connection issues: loose connections, corrosion, pushed-back pins, a marginal controller, or a combination of these problems. If the fault is not present at the time of testing, the exact cause may not be found on that visit.
How to troubleshoot Bobcat A8707: first checks
- With the key switch in the run/enter on position, check for the active code, since this is the condition needed for the controller to display and log A8707.
- Visually inspect the output "H" solenoid connector and the ACD/RACD controller connectors for moisture, corrosion, or pins that have been pushed back out of the connector body.
- Check the mainframe harness and attachment control harness for chafing, pinches, or damage along their length, paying attention to any section that flexes near the attachment mount.
- Test continuity on the output "H" circuit from controller pin J1 B-6 out to the solenoid, and on the output "H" ground wire, looking for an open condition.
- Check the resistance of the output "H" solenoid coil to confirm it has not failed open.
- If nothing is found and the code was not active during testing, treat it as intermittent and recheck connectors and harness routing for loose or marginal connections before ruling out the controller.
How the code clears
Once the open circuit is repaired, clear the code by cycling power (turning the key switch off and back on). No separate reset procedure beyond a power cycle is listed for this code.
Affected models and serial ranges
A8707 appears in our records across 18 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| E35 | SN AC2P11001-99999 |
| E42 | SN AG3411001-99999 |
| E45 | SN AG3G11001-99999, SN AHHC11001-99999 |
| E55 | SN ARWM11001-99999, SN ASW311001-99999 |
| S510 | SN A3NJ11001-99999, SN A3NK11001-99999, SN ATZC11001-99999 |
| 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 A3NT10001-12369, SN A3NT12370-99999, SN A3NU11001-11111, SN A3NU11112-99999 |
| S650 | SN A3NV11001-13098, SN A3NV13099-99999, SN A3NW11001-11248, SN A3NW11249-99999 |
| S750 | SN A3P211001-299999 |
| S770 | SN A39511001-99999, SN A3P411001-99999 |
| T590 | SN ALJU11001-999999, SN B37811001-999999, SN B3Z711001-999999 |
| T630 | SN A7PU11001-11663, SN A7PU11664-99999 |
| T650 | SN A3P012214-099999, SN A3P111242-199999 |
| T770 | SN A3P811001-899999, SN A3P911001-999999 |
| T870 | SN A3PG11001-99999 |
Frequently asked questions
What does Bobcat code A8707 mean?
It means the ACD/RACD controller does not detect the solenoid on output "H" at controller pin J1 B-6. The controller treats this as an open circuit and disables output "H" until it's fixed.
What is the panel number for A8707?
On some displays this code shows as 87-07, which is the numeric panel form of A8707.
Will my attachment function work with A8707 active?
No. Once the code sets, the controller disables output "H", so whatever solenoid function is wired to that output will not operate until the open circuit is repaired.
What usually causes an output "H" open circuit?
Common causes include an open wire or ground wire at controller pin J1 B-6, a failed output "H" solenoid, moisture or corrosion in the connectors, pushed-back pins, or a fault in the ACD/RACD controller itself.
How do I clear A8707 after repairing it?
Cycle power by turning the key switch off and back on. No other reset step is listed.
The code only shows up sometimes. What should I check?
Intermittent A8707 codes are often caused by loose connections, corrosion, or pushed-back pins in the connectors, or a marginal wire harness or controller. If the code isn't active during testing, thoroughly inspect all connectors and harness routing since the exact cause may not be identifiable in that moment.
Which Bobcat machines use this code?
A8707 applies to the ACD/RACD-equipped Bobcat models including E35, E42, E45, E55, S510, S530, S550, S570, S590, S630, S650, S750, S770, T590, T630, T650, T770, and T870.