387-9840 Crankshaft AS CAT spare part

Advantages

● Transmits rotational motion to the transmission
● Manufactured to precise specifications; durable and reliable

1. Compact integrated forged steel structure with good fatigue and torsion resistance, suitable for frequent start-stop of small construction machinery.
2. Main journals and connecting rod journals are precision machined with stable wear-resistant layer, slowing bearing wear and extending overhaul interval.
3. Integrated timing gear with accurate tooth profile keeps valve timing stable and reduces fuel injection and ignition failures.
4. Pre-assembled counterweights with factory dynamic balance calibration reduce engine vibration and protect electronic components.
5. Built-through lubrication oil passages with compact layout guarantee stable lubrication at idle and variable load conditions.
6. OE standard assembly for direct replacement without extra machining, compatible with engine electronic calibration.

FAQ 

Q1: Can 387-9840 fit original C3.3 engine (non B version)?
A1: Not interchangeable. C3.3 and C3.3B differ in timing gear and journal dimension.
Q2: Can the crankshaft be used if gear teeth have slight pitting?
A2: Slight pitting requires regular inspection. Replace the whole crankshaft if chipping or large peeling occurs.
Q3: Which spare parts should be renewed together with crankshaft?
A3: Main bearings, connecting rod bearings, thrust washers, front and rear oil seals and main bearing bolts are recommended.
Q4: How to protect the timing gear during storage?
A4: Coat gear with anti-rust grease, wrap with soft protective film and support on multi-point fixture to avoid bending and impact.