VS speed regulator governor compression spring for Cummins NT855, K19, M11 diesel engines, aftermarket replacement PT fuel pump governor parts. All part numbers are cross-referenced against OEM specs for direct matching.

Part numbers: 70778, 138810, 153240, 109686, 70821, 70822, 109687, 109688
Fits: Cummins NT855, K19, M11 diesel engine
Position: PT fuel pump VS speed regulator assembly

What you are ordering
Price is per governor compression spring. All part numbers are separate variants, please select the correct PN from variant options. These governor springs are not interchangeable. Different part numbers have different spring tension, free length and load characteristics. Wrong selection will cause unstable speed regulation, engine hunting, over-speed risk and abnormal power response.

Specifications
Material: high strength spring steel
Structure: precision wound compression spring
Tension & dimension: calibrated to OEM standard
Finish: anti-corrosion and fatigue resistance treatment, load tested before packing
Packing: individual protective bag, marked with part number

When to replace
Governor compression spring suffers fatigue, deformation and force decay after long running hours. Common failure signs: engine speed hunting, unstable idle, difficult speed control, over-speed tendency. Replace the matched governor spring together when deformation or fatigue is detected, and inspect other governor moving components at the same time.

Fitting notes
Strictly confirm the spring specification and installation position before assembly. Do not mix springs of different part numbers. Follow Cummins service manual for governor assembly and speed calibration. If you are not sure which PN matches your engine CPL, send us engine serial number for confirmation.

Warranty and shipping
Covered by a 12-month warranty against manufacturing defects. Orders are dispatched within 3–7 business days; DHL / FedEx delivery takes 5–10 business days. Tracking number is sent as soon as the parcel leaves our warehouse.

Note: manufacturer names and part numbers are used for identification and cross-referencing only. We are an independent aftermarket supplier and are not affiliated with, or authorised by, the original manufacturer. Please verify the part number against your engine's parts catalogue before ordering — our team is happy to help if you send us your engine model or serial number.