CATEngine Parts

4C4782 O-Ring Kit — Cat 320C 320D

This is a CAT O-Ring Kit, providing a selection of essential seals for various components within the engine and hydraulic systems. Manufactured to meet stringent OEM quality standards, these O-rings offer superior sealing performance and longevity compared to worn or degraded seals. Operators may experience fluid leaks, reduced system pressure, or contamination ingress when the O-rings in this kit fail.

O-Ring Kit – Part No 4C4782 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
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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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

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

Part TypeO-Ring Kit
MaterialNBR Rubber
ApplicationEngine and Hydraulic Systems
Service LifeReplace as needed during maintenance or repair
CompatibilityCaterpillar 320C, 320D, 323D, 325D, 329E
ConditionNew — CTP aftermarket replacement

Failure Symptoms

The first sign of failing O-rings is typically visible fluid leakage from seals or connections, often accompanied by a slight drop in system performance. If left unaddressed, leaks can worsen, leading to significant fluid loss, potential contamination of the hydraulic system, and reduced operational efficiency. Continued operation with leaking O-rings can cause damage to mating surfaces and lead to more extensive and costly repairs.

Installation Tip

Always lubricate O-rings with the appropriate system fluid or a compatible lubricant before installation to prevent tearing or damage during seating. Ensure the groove is completely free of old seal material and debris.

Service Note

When replacing O-rings, inspect the corresponding seals, glands, and mating surfaces for any signs of wear, scoring, or damage that may require additional repair.