Bobcat A8702 (87-02) Fault Code: ACD/RACD Output "H" Error On
Also shown on the panel as 87-02 · Also called ACD Output ‘H’ Error On
ACD/RACD Output "H" Error On · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8702 sets when the ACD/RACD controller sees voltage on output "H" wire 5050 while it did not energize the attachment solenoid coil on that circuit. The controller shuts off the "H" output, the attachment on that output stops working, and the ACD/RACD icon on the right instrument panel blinks. It shows on panel as 87-02.
Medium severity. The affected attachment output shuts down until the fault is corrected, which can stop attachment work, but it does not by itself indicate an immediate safety emergency or engine/hydraulic damage risk. Treat it as a stop-and-diagnose issue before continuing to run that attachment.
What does Bobcat error code A8702 mean?
A8702 (shown as 87-02 on the panel) is an ACD/RACD (Attachment Control Device / Remote Attachment Control Device) fault. The ACD/RACD controller manages power to attachment solenoid coils through dedicated output circuits so the operator can run different attachments from the cab.
This code means the controller detected voltage present on output "H", wire 5050, at a time when the controller itself had not commanded that output on. In other words, the circuit is "live" when it should be dead. Because this looks like a wiring fault that could cause an attachment to activate unexpectedly, the controller protects the machine by shutting off the "H" output entirely.
Once active, the attachment connected to output "H" will not function, and the ACD/RACD icon on the right instrument panel blinks to alert the operator.
Common causes of A8702
- Circuit output "H", wire 5050, to the attachment solenoid is shorted to a power source.
- A fault in the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
- Intermittent cases: loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems. If the code is not active at the time of testing, the cause may not be found on that visit.
How to troubleshoot Bobcat A8702: first checks
- Confirm the key switch is in run/enter, since this is a required condition for the code to be set and for testing it.
- Inspect the mainframe and attachment control harness connectors related to wire 5050 for moisture, corrosion, or pins that have pushed back out of the connector body.
- Trace circuit output "H" (wire 5050) from the ACD/RACD controller to the attachment solenoid, checking for a short to a power source anywhere along the run.
- If the fault is not active during testing, treat it as intermittent and re-check all connections, harness routing, and pins under vibration or movement, since the cause may not show up on a static check.
- If wiring and connectors check good, suspect the ACD/RACD controller itself as a possible cause.
How the code clears
Once the repair is complete, cycle the key power off and back on to clear the code. No separate clearing step is listed.
Affected models and serial ranges
A8702 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 ATZC11001-99999 |
| 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 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 A8702 mean?
It means the ACD/RACD controller found voltage on output "H" (wire 5050) when it had not sent power to energize the attachment solenoid on that circuit. The controller shuts the output off as a protective response.
What is the panel display for A8702?
On the instrument panel it displays as 87-02, and the ACD/RACD icon on the right instrument panel blinks while the code is active.
Will my attachment still work with A8702 active?
No. While the code is active, the ACD/RACD electric output is shut off, so the attachment wired to output "H" will not operate.
What usually causes this code?
The most common causes are a short to power on wire 5050 between the controller and the attachment solenoid, moisture or corrosion in the mainframe or attachment control harness connectors, pushed-back pins, or a fault in the ACD/RACD controller itself.
The code only shows up sometimes. Why can't I find the cause?
Intermittent faults on this circuit may not be present when you test the machine, so the root cause can be hard to pin down on a single visit. Likely culprits include loose connections, corrosion, pushed-back pins, harness damage, or the controller, alone or in combination.
How do I clear A8702 after repair?
Cycle the key power off and back on after completing the repair. No separate clearing procedure is required beyond that.
Which Bobcat machines can show A8702?
It applies to S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 skid-steer and compact track loader models, as well as T870.