Buy 3970806 - Genuine Cummins Electrical Governor Actuator - wisentpartscenter.com

Description

3970806 is a Genuine Cummins Electrical Governor Actuator used on select Cummins ISL / ISL9 CM850 applications. The actuator is part of the engine speed and fuel-control system, helping the governor control engine response under load. Verify 3970806 by ESN, original part number. Electrical governor actuators should not be ordered by appearance only, because the wrong unit can cause poor throttle response, unstable engine speed, hard starting, or repeat troubleshooting.

Purpose of the Part

The electrical governor actuator receives control commands from the engine control system and moves the fuel-control/governor mechanism as required. This helps maintain commanded engine speed, idle quality, and load response. When the actuator or its circuit fails, the engine may surge, hunt, stall, lose power, or fail to respond correctly to throttle/load changes.

Issue Symptoms / When to Replace

Common signs that 3970806 may need inspection or replacement include:

  • Engine speed hunting or unstable idle
  • Poor throttle response or delayed engine response under load
  • Engine stalling, surging, or inconsistent RPM control
  • Hard starting or no-start if the actuator cannot move correctly
  • Intermittent power loss related to governor/fuel-control operation
  • Damaged actuator wiring, loose connector, corrosion, or poor ground
  • Failed actuator movement test after wiring and mechanical linkage are checked

Brand Information

Cummins is the OEM engine manufacturer for the ISL / ISL9 platform and supplies engine, fuel-system, electronic-control, and service components for commercial and industrial applications. Genuine Cummins is preferred for governor actuator replacement because incorrect or low-quality actuators can create repeat speed-control issues, extra diagnostic time, and unnecessary downtime.

Installation Notes

Before replacing 3970806, confirm the ESN, original part number. Disconnect battery power, inspect the harness and connector, and check the governor linkage or fuel-control mechanism for binding before installing the new actuator. Mount the actuator without forcing the linkage out of position. After installation, verify actuator movement, idle stability, throttle response, and active/inactive faults with the proper diagnostic tool. Refer to Cummins QuickServe or the OEM service manual for adjustment procedure and torque specs.

How to Identify an OEM Part

A Genuine Cummins 3970806 Electrical Governor Actuator should be verified by the Cummins part-number label, original packaging, connector style, and the Woodward part number 8235-206 when present on the actuator.

Why buy from Wisent Parts
  • ⏱️
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  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

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Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.