Overview — 3934920
Overview
Rocker Arm 3934920 is a commonly used spare part in construction machinery. We can supply all the original and replacement part numbers listed below, in stock or available on order — welcome to enquire by part number.
Applicable Models & Applications
This rocker arm serves the valve train of Cummins cylinder heads, transferring cam motion to the valves at the correct ratio. Suitable for the corresponding machine model and configuration — please verify the machine model, serial number and part number match before ordering.
Maintenance & Replacement
Check valve lash at the prescribed interval and inspect rocker arm pivots and pad faces for wear; replace pairs or full sets when scoring, pitting or excessive lash appear. Early signs it may need attention: A rhythmical metallic click from the valve cover that tightens under rpm; Unusual valve lash that keeps drifting, which suggests a worn fulcrum or pad; Poor performance and a smoking cylinder where the rocker arm has worn into the valve tip.
Installation Essentials
Work on a clean machine with the engine off and the relevant system drained or depressurised as required, and confirm the part number against your machine model and serial number before ordering. Replace gaskets and fasteners as the manual requires, and re-set the lash after fitting. After installation, run the machine and check for leaks, unusual noise or abnormal travel before returning it to service, and retighten where the manual calls for it after the first hours of operation.
Reference Price
The reference price for this Rocker Arm (listed under 3934920) is approximately USD 10 – 20 per unit, depending on configuration, quantity and shipping destination. This is an estimate for planning purposes — please confirm current pricing and availability with our sales team before ordering.
Available Part Numbers
- 3934920
Also in the Rocker Arm Series
Same-series, real numbers we also supply (always confirm fit and interchange against your machine): 3910811, 3910810, 3910808
For dependable sourcing of Rocker Arm, Racer Machinery combines verified interchangeability with quick dispatch and pre-shipment inspection. Request a quote and our team will confirm availability in one step.
