CATUndercarriage

3T7399 Piston — Cat D7H

This is a replacement piston, a fundamental component within the engine's combustion chamber responsible for converting the pressure from burning fuel into mechanical motion. Manufactured to precise dimensions and material specifications, it ensures efficient power transfer and durability, unlike a worn piston that may exhibit scoring or reduced compression. Operators might notice a loss of engine power, increased exhaust smoke, or rough engine running if this piston fails.

Piston – Part No 3T7399 – CAT Spare Part
Part Specifications
BrandCAT
CategoryUndercarriage
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

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Installation & Application Notes

Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypePiston
MaterialAluminum alloy
ApplicationEngine cylinder
Service LifeReplace upon engine overhaul or if damaged
CompatibilityCAT D7H
ConditionNew — OEM specification aftermarket

Failure Symptoms

Early signs of piston failure include a noticeable decrease in engine power and increased exhaust smoke, often blue or black. If ignored, the piston can suffer from ring land failure or skirt damage, leading to increased oil consumption and potential cylinder wall scoring. The primary equipment risk is severe engine damage, potentially requiring a complete engine rebuild.

Installation Tip

Ensure the cylinder bore is perfectly clean and lubricated before installing the piston to prevent scoring the cylinder walls or piston skirts. Always install new piston rings and ensure they are properly seated and gapped according to specifications.

Service Note

When replacing a piston, it is highly recommended to inspect and replace piston rings, connecting rod bearings, and cylinder liners.