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Bobcat · Hydraulic

Bobcat code M3507: Hydraulic fan open circuit

What it means

The controller sees an open circuit in the hydraulic cooling fan's electrical control. Cooling may not work correctly.

Can I keep running?

Stop: fix before running

No. Stop the machine safely (bucket or attachment down, engine off) and find the cause before you run it again.

Check first

  1. Park on level ground, lower the lift arms and attachment to the ground, stop the engine and remove the key.
  2. Let the engine cool. Keep hands away from the fan.
  3. Inspect the connector and wiring at the hydraulic fan control for damage or a loose plug.
  4. Clean debris from the cooler and radiator as the O&M manual describes.
  5. Restart and see if the code comes back. If it does, stop and call your Bobcat dealer.

Likely causes

  • Unplugged or corroded fan control connector
  • Broken wire in the fan circuit
  • Failed fan control solenoid or valve coil

The fix

Repairing the wiring or connector, or replacing the fan control solenoid, fixes it. Don't work the machine hard until it's fixed, because poor cooling can overheat the engine and hydraulics.

Different code on your screen? Snap the display and Mechy reads it.

Related hydraulic codes

All Bobcat codes

Questions

What does Bobcat code M3507 mean?

Hydraulic fan open circuit. The controller sees an open circuit in the hydraulic cooling fan's electrical control. Cooling may not work correctly.

Can I keep running with M3507?

No. Stop the machine safely (bucket or attachment down, engine off) and find the cause before you run it again.

How do I fix Bobcat code M3507?

Repairing the wiring or connector, or replacing the fan control solenoid, fixes it. Don't work the machine hard until it's fixed, because poor cooling can overheat the engine and hydraulics.

Sources

  1. Bobcat Company, Diagnostic Service Codes list (fault codes PDF, 2020)
  2. Bobcat T450 Operation & Maintenance Manual 7250077 (2018), Diagnostic Service Codes
  3. BigRentz, Full List of Bobcat Fault Codes (searchable table)

Code meanings vary by model, serial range and software. Confirm with your operator's manual or Bobcat dealer before replacing parts.

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