Multiquip 374469820 Main Spring - OEM Replacement Part for Rammers

The main spring (also called spiral spring) is a critical power transmission component in tamping rammers that converts the engine's circular motion into the percussive impact force needed for soil compaction. This spring works in conjunction with the centrifugal clutch system to deliver consistent, powerful jumping action at the rammer foot. When the main spring fails or weakens, operators will notice erratic jumping behavior, inconsistent compaction results, or complete loss of ramming action even when the engine runs normally.

According to Multiquip troubleshooting procedures, spring failure is a primary cause when the engine runs but the rammer jumps erratically or not at all. Regular inspection of the spring for fatigue, cracks, or deformation is essential for maintaining optimal performance. The MT77HFR uses an oil bath lubrication system, and proper oil levels must be maintained to protect the spring and internal components during operation.

This main spring is compatible with the following Multiquip model:

• MT77HFR Tamping Rammer (Honda GXR120RT-KRB6 Engine)

Genuine Multiquip OEM part, sold by an authorized dealer.