Bobcat A8706 (87-06) Fault Code: ACD/RACD Output “H” Short to Ground
Also shown on the panel as 87-06 · Also called ACD Output ‘H’ Short to Ground, ACD/RACD Output “H” Short to Ground
ACD/RACD Output “H” Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat code A8706, also shown as panel code 87-06, sets when the ACD/RACD controller commands output "H" (controller pin J1 B-6) but does not detect voltage there. The controller disables output "H" when this happens. It typically points to a short to ground in the output wiring, the solenoid, or the controller itself.
Medium severity. The affected attachment control output is disabled until the fault is fixed, so whatever function runs on output "H" will not work. This is not an engine or machine-safety shutdown, but it can leave an attachment function unusable until repaired.
What does Bobcat error code A8706 mean?
A8706 is set by the ACD/RACD controller (Attachment Control Device / Remote Attachment Control Device) when it commands output "H", at controller pin J1 B-6, and does not see the voltage it expects to see there. The controller responds by disabling that output until the fault clears.
In plain terms, the controller tries to energize a solenoid circuit and the feedback it gets back is not consistent with a properly working circuit; the most common reason this happens is that the output wire or solenoid winding is shorted to ground instead of carrying normal voltage.
Because output "H" is disabled once this code sets, whatever attachment function that output controls will stop functioning until the short is found and repaired and the code is cleared.
Common causes of A8706
- Output "H" wiring at controller pin J1 B-6 shorted to ground
- Output "H" solenoid fault (winding shorted or damaged)
- ACD/RACD controller fault
- Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, mainframe harness, attachment control harness, or the output "H" solenoid connector
- Intermittent condition: loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these, which may not show a fault if it is not active at the time of testing
How to troubleshoot Bobcat A8706: first checks
- With key switch / (run/enter) on, check for the code on the display and confirm whether it is currently active or was stored as intermittent
- Inspect the ACD/RACD controller connectors and the mainframe and attachment control harness connectors for moisture, corrosion, or pushed-back pins
- Check the output "H" solenoid and its connector for damage, corrosion, or a shorted winding
- Trace the wiring from controller pin J1 B-6 to the output "H" solenoid for chafed insulation or pinched sections that could be shorting to ground
- If the code is not active during testing, wiggle-test connectors and harness sections while watching for the code to reappear, since the fault may be intermittent
How the code clears
Cycle power (turn the key switch off, then back on) after the repair is complete. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
A8706 appears in our records across 20 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| E35 | SN A93K110001-99999, 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 |
| 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 |
Frequently asked questions
What does Bobcat code A8706 mean?
It means the ACD/RACD controller commanded output "H", at controller pin J1 B-6, but did not detect the expected voltage on that circuit. The controller disables output "H" when this happens.
What is the panel display number for A8706?
On the Bobcat panel, A8706 shows as numeric code 87-06.
What usually causes this fault?
The most common causes are a short to ground in the output "H" wiring, a failed output "H" solenoid, a fault in the ACD/RACD controller, or moisture, corrosion, or pushed-back pins in the related connectors and harnesses.
Will my attachment still work with this code active?
No, not the function tied to output "H". The controller disables that output once the code sets, so whatever attachment function relies on it will not operate until the fault is fixed.
The code isn't showing right now, does that mean it's fixed?
Not necessarily. If the code is intermittent, it may not be present at the time of testing. The underlying cause, such as loose connections, corrosion, pushed-back pins, the controller, or the harness, may still exist and could reappear.
How do I clear A8706 after repair?
Cycle the key switch off and back on. No other clearing procedure is listed for this code.
Which Bobcat machines can show code A8706?
It applies to models including E35, E42, E45, E55, S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770/T870 equipped with the ACD/RACD attachment control system.