CATBearing & Bushing

8J4585 Cylinder Gp-Boom — Cat 225 227

This is a complete boom cylinder assembly, a hydraulic actuator responsible for lifting and lowering the boom on an excavator. Built to withstand high hydraulic pressures and environmental exposure, it ensures consistent and powerful boom control, unlike a damaged cylinder that would exhibit slow or erratic movement. Operators may notice a significant decrease in boom lifting capacity, slow or jerky boom operation, or hydraulic fluid leaks around the cylinder seals when this component is failing.

Cylinder Gp-Boom – Part No 8J4585 – 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 TypeCylinder Assembly
MaterialSteel Alloy and Hydraulic Seals
ApplicationExcavator Boom Control
Service LifeReplace based on inspection and performance, typically 5,000-8,000 hrs
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first signs of a failing boom cylinder often include sluggish or jerky boom movement, or a noticeable loss of lifting power. If ignored, the cylinder may begin to leak hydraulic fluid externally or internally, leading to slower operation and potential system overheating. The worst consequence is the inability to control the boom position, posing a risk to personnel and equipment.

Installation Tip

Ensure all hydraulic connections are clean and properly sealed before connecting hoses to the new cylinder. Avoid over-tightening hose fittings, which can damage the threads or the fittings themselves.

Service Note

Inspect the hydraulic lines, fittings, and the hydraulic fluid for contamination or damage before installing the new cylinder.