CATBearing & Bushing

1258869 Crown As- Piston — Cat PM-465 RM-350B

This is a CAT 1258869 Crown Piston Assembly, a vital component within the hydraulic system responsible for converting hydraulic pressure into mechanical force. It is manufactured to meet stringent OEM quality standards, ensuring precise operation and durability, unlike worn assemblies that may exhibit leaks or reduced power. Operators might observe sluggish hydraulic functions, loss of power, or audible leaks if this piston assembly is compromised.

Crown As- Piston – Part No 1258869 – CAT Spare Part
Part Specifications
BrandCAT
CategoryBearing & Bushing
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

Never strike bearings directly — use a bearing press or driver set. Heat housing (not bearing) to ease installation. Replace bearings in sets where applicable. Check housing bore diameter before fitting — out-of-round bores destroy new bearings.

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

Part TypeCrown Piston Assembly
MaterialHardened Steel
ApplicationHydraulic system (e.g., pump or motor)
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing crown piston assembly may initially manifest as a decrease in hydraulic system pressure or a noticeable loss of power during operation. If left unaddressed, internal leakage will worsen, leading to overheating of the hydraulic fluid and reduced efficiency. The ultimate consequence is the inability of the hydraulic system to perform its intended function, causing significant operational downtime.

Installation Tip

Thoroughly flush the hydraulic system to remove any contaminants before installing the new piston assembly. Ensure all seals and O-rings are properly lubricated with clean hydraulic fluid before assembly to prevent damage during initial startup.

Service Note

Inspect the cylinder bore for scoring or wear, and check all associated seals and O-rings for degradation or damage.