CATHydraulic Parts

0S1591 Cap Screw — Cat 320C 320D

This cap screw is a critical fastener used in Caterpillar hydraulic systems to secure components and maintain system integrity. It is manufactured to meet stringent material and dimensional standards, ensuring a reliable seal and preventing leaks that a worn or stripped screw would cause. Operators may notice hydraulic fluid leaks around the connection point or a loose component if this screw fails.

Cap Screw – Part No 0S1591 – CAT Spare Part
Part Specifications
BrandCAT
CategoryHydraulic 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

Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.

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

Part TypeCap Screw
MaterialHardened Steel
ApplicationHydraulic System Fastener
Service LifeReplace as needed during hydraulic system maintenance
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Visible hydraulic fluid seepage around the connection point is the first sign of a failing cap screw seal. If ignored, the leak may worsen, leading to a gradual loss of hydraulic pressure and system performance. Continued operation with a significant leak can result in insufficient hydraulic function and potential damage to other system components.

Installation Tip

Ensure the mating surfaces and threads are clean and free of debris before installation to achieve a proper seal. Overtightening this fastener can strip the threads or damage the component it secures.

Service Note

Inspect the sealing washer or O-ring associated with this cap screw for signs of wear or damage and replace if necessary.