C3955153 XCMG GR2605 motor grader fuel pump gear

C3955153 is the fuel pump drive gear of Cummins engines, which is a key transmission component of the engine’s fuel system. It adopts a helical cylindrical gear structure and is precision machined from high-strength alloy forged steel. It is mainly responsible for transmitting the power of the engine crankshaft to the high-pressure fuel pump through the gear system, driving the oil pump to operate with precise transmission ratio, ensuring the timing and pressure stability of fuel injection, and directly affecting the power output, fuel efficiency, and emission performance of the engine.

Applicable Engine Series:

Equipment Applications:

Location:

Installed in the front gear housing, directly connected to the fuel pump shaft and meshed with the camshaft idler gear. It is the core link between the crankshaft and the fuel pump.

Causes: Long-term high load, poor lubrication, contaminated oil, incorrect backlash.

Symptoms: Weak acceleration, unstable idle, periodic “ticking” noise from gear housing, fluctuating fuel pressure.

Solution: Replace gear immediately. Check oil quality and replace filter. Inspect mating idler gear and replace if necessary. Readjust gear backlash.

Causes: Severe overload, foreign object ingestion, excessive installation shock, material defect.

Symptoms: Sudden engine stall, failure to start, violent knocking noise, broken teeth found upon inspection.

Solution: DO NOT crank engine! Disassemble gear housing and remove all metal debris. Replace all damaged gears (C3955153 and idler). Inspect for secondary damage to oil pump and bearings.

Causes: Worn Woodruff key, insufficient installation interference, loose fit due to high heat.

Symptoms: RPM increases but power is low, abnormal exhaust smoke; gear spins with no effective drive.

Solution: Replace gear and Woodruff key. Inspect fuel pump shaft for wear; repair or replace pump if out of tolerance. Install strictly per shrink-fit procedure (heat to 175°C).

Causes: Timing marks (line/letter “C”) not aligned, timing not locked during service.

Symptoms: Hard starting, poor power, black smoke, backfiring, possible piston-valve contact.

Solution: Re-time engine. Ensure timing marks on gear are perfectly aligned with marks on idler/housing during installation for precise injection phasing.