Bobcat M1807 (18-07) Fault Code: Lift Spool Lock Open Circuit
Also shown on the panel as 18-07 · Also called Lift Spool Lock Output Open Circuit
Lift Spool Lock Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat code M1807, shown on the panel as 18-07, means the gateway controller has detected an open circuit on the lift spool lock solenoid circuit, either on signal wire 4680/return wire 2680 or signal wire 4380/return wire 2380 depending on the machine's wiring variant. When this code sets, the loader disables both lift and tilt functions until the fault is fixed and power is cycled.
High severity. With M1807 active, lift and tilt are disabled, so the machine cannot be used for normal loader work. It is not an immediate engine or safety-damage emergency, but it stops productive operation and should be diagnosed before returning the machine to service.
What does Bobcat error code M1807 mean?
M1807 points to the lift spool lock solenoid circuit, the electrical path the gateway controller uses to command the hydraulic lift spool lock. This lock is a safety and control feature that keeps the lift function from moving unless the controller specifically allows it.
When the controller sees an open circuit on the signal wire (4680 or 4380, depending on the wiring variant fitted to your machine) or on the matching return wire (2680 or 2380), it assumes the solenoid circuit cannot be verified as intact. Because it cannot confirm the lock circuit is working correctly, it disables both lift and tilt as a precaution.
This means M1807 is not just an informational code. Once it sets, you lose loader lift and tilt control entirely until the wiring or component issue is corrected and power is cycled.
Common causes of M1807
- Signal wire 4680 (or 4380 on the other wiring variant) shorted to supply voltage or open.
- Return wire 2680 (or 2380) open.
- Faulty lift spool lock solenoid.
- Faulty gateway controller.
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the lift spool lock solenoid connector, or the mainframe harness.
- Intermittent fault: if the code is not active at the time of testing, the root cause may not be found right away. Likely causes in this case are the same list: loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these.
How to troubleshoot Bobcat M1807: first checks
- With the key switch on (run/enter), check whether the code is currently active or was logged as historic/intermittent. This changes your diagnostic approach.
- Inspect the lift spool lock solenoid connector and the gateway controller connectors for moisture, corrosion, or pins that have pushed back out of the connector body.
- Trace signal wire 4680 and return wire 2680 (or 4380/2380 on the other variant) from the solenoid to the gateway controller, checking for opens, chafe points, or a short to supply voltage on the signal wire.
- Check the mainframe harness along its run for pinch points, chafing, or corrosion at any splices or connectors.
- If the code will not reproduce and is not currently active, treat it as intermittent: recheck all connections, pins, and harness sections listed above since the fault may not be isolated on a single test.
- If wiring and connectors check out, test the lift spool lock solenoid itself, then suspect the gateway controller if the solenoid and wiring are confirmed good.
How the code clears
Bobcat lists cycling the key power as the step to clear M1807 once the repair is complete. There is no separate reset procedure listed beyond powering the machine off and back on after the open circuit has been corrected.
Affected models and serial ranges
M1807 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, SN A3NW11249-99999 |
| S750 | SN A3P211001-299999 |
| S770 | 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 M1807 mean?
It means the gateway controller detected an open circuit on the lift spool lock solenoid circuit, either signal wire 4680 with return wire 2680, or signal wire 4380 with return wire 2380, depending on which wiring variant your machine uses. The controller responds by disabling lift and tilt.
Why did my loader lose lift and tilt function?
If M1807 is active, the machine disables lift and tilt automatically because the controller cannot verify the lift spool lock solenoid circuit is intact. This is expected behavior for this fault, not a separate malfunction.
Which Bobcat models can get code M1807?
This code applies across a wide range of Bobcat loaders including the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770/T870 lines.
Is M1807 the same as fault code 18-07?
Yes. 18-07 is the numeric panel display form of M1807 on Bobcat machines that show codes as two-digit number pairs instead of the M-code format.
How do I clear M1807 after I fix the wiring?
Cycle the key power off and back on. No separate reset procedure is listed beyond that.
What if the code doesn't show up when I test the machine?
Treat it as intermittent. Bobcat notes that when the code is not active at the time of testing, the cause may not be immediately found. Recheck all connections, pins, and harness sections for loose connections, corrosion, or pushed-back pins rather than assuming the issue is gone.
Can a bad gateway controller cause M1807 instead of a wiring problem?
Yes. The gateway controller itself is listed as a possible cause alongside the lift spool lock solenoid and the wiring, so if the harness and connectors check out good, the controller should be evaluated next.