464-2931 Boom Cylinder Seal Kit 85mm Rod for Caterpillar Excavator CAT 320 GC 320D 320D2 323

464-2931 Boom Cylinder Seal Kit

464-2931 is a hydraulic cylinder seal kit used for boom cylinder repair on selected Caterpillar excavators. The kit includes sealing components for an 85 mm rod configuration and is designed to restore hydraulic sealing performance during cylinder overhaul.

This part number is used across several 320 and 323 excavator configurations. Correct fitment should be confirmed by the original seal kit number, machine model and cylinder configuration rather than by excavator model alone.

Caterpillar 320 and 323 Fitment

Compatible applications include Caterpillar 320 GC, 320, 320D, 320D L, 320D LN, 320D LRR, 320D2, 320D2 L, 323, 323D L and 323D2 L excavators.

Because different cylinder groups can be installed across machine generations and serial ranges, confirm the original 464-2931 number or the boom cylinder information before ordering. Clear photos of the cylinder label or removed seal kit can also help with parts verification.

Seal Kit and Cylinder Inspection

The 464-2931 reference kit uses sealing components for an 85 mm rod, including rod sealing, buffer and backup elements. During rebuilding, inspect the piston rod for scoring, corrosion or chrome damage and check the gland, piston and seal grooves for abnormal wear.

All components should be cleaned carefully before assembly, and each seal should be installed in the correct direction. If the rod or cylinder surface is damaged, replacing the seals alone may not eliminate hydraulic leakage.

Topvelsun Cylinder Seal Kit Supply

Topvelsun supplies excavator hydraulic cylinder seal kits through multiple qualified supply channels with 1-piece MOQ and a 6-month warranty. Packaging and seal brands may vary by supply batch. If a specific brand or packaging requirement is needed, confirm it before ordering.