Governor Motor 525-4478 5254478 for Caterpillar 305E 306 308.5 Mini Excavator
Governor Motor 525-4478 5254478 for Caterpillar 305E 306 308.5 Mini Excavator
Available in stock
Product Description
Part Name: Governor Motor / Motor Assembly (Governor Control Group)
Part Number(s): 525-4478, 5254478
Brand Compatibility: Caterpillar
Machine Type: Mini Hydraulic Excavator
Condition: Brand New
Shipping: Fast worldwide shipping with secure packaging and reliable delivery in 2–7 business days.
The 525-4478 governor motor is a direct replacement for selected Caterpillar mini hydraulic excavators. Officially described by Caterpillar as a Motor Assembly (Governor Control Group), this actuator controls the engine governor by regulating fuel delivery to maintain stable engine speed and responsive throttle operation. Manufactured to OEM specifications using high-quality electrical components, this replacement governor motor restores accurate engine speed control, smooth throttle response and dependable machine performance.
Designed for Caterpillar mini excavators operating in construction, landscaping, utility installation, civil infrastructure, agriculture and general earthmoving, this governor motor helps maintain engine efficiency, improves machine productivity and minimises downtime in demanding working environments.
Cross-Reference Part Numbers
525-4478, 5254478
Compatible Engines
Caterpillar C Series: C2.4 and C3.3B diesel engines (application dependent).
Compatible Models
Mini Hydraulic Excavators: 305 CR, 305E, 305E2, 305E2 CR, 305.5E, 305.5E2, 305.5E2 CR, 306, 306.5, 307.5, 308.5 and 310.
Common Symptoms of Failure
Engine speed not responding correctly, unstable idle, throttle response delays, engine hunting, governor fault codes, reduced engine performance, poor fuel control or complete governor actuator failure.
Fitment Note
Please confirm your existing OEM part number, machine model and serial number before ordering. Caterpillar may use different governor motor assemblies depending on the machine serial number, engine configuration and emissions specification. If you are unsure, contact our technical team with your machine serial number or photos of your existing governor motor and we will verify compatibility before dispatch.
Technical Specifications
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Is there a warranty on products purchased from IMARA Engineering Supplies?
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Does IMARA Engineering Supplies offer international shipping?
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