COGENG 4320996 Equivalent Boom Cylinder Seal Kit Set

PRODUCT IDENTIFICATION

CROSS REFERENCE GUIDE

TECHNICAL SPECIFICATIONS

Boom Cylinder Specifications (Typical)

Material Specifications

Performance Ratings

KIT COMPONENTS DETAILS

Complete Seal Inventory

Decompose pictures

Parts list

Installation decomposition diagram
System Depressurization: Before starting, completely release all hydraulic pressure from the system. Lower the boom and bucket to the ground, and safely cycle all control levers to relieve any trapped pressure in the lines.
Work in a Clean Environment: Contamination is the number one cause of premature seal failure. Clean the exterior of the cylinder thoroughly and perform the disassembly and assembly in a clean, well-lit area.
Careful Disassembly:
Mark the gland, piston, and tube for easy reassembly in the same orientation.
Inspect all metal components (cylinder rod, tube interior, piston, and gland) for scores, scratches, or pitting. Light polishing can address minor imperfections; severe damage requires component repair or replacement.
Proper Seal Installation:
Lubricate Generously: Soak all new seals in clean hydraulic oil before installation. Lubricate all sealing surfaces and grooves.
Use the Right Tools: Always use seal picks, cone tools, or soft-tipped tools. Never use sharp screwdrivers or pliers that can nick or cut the seals.
Observe Direction: Pay close attention to the lip direction of piston and rod seals. Incorrect installation will cause immediate leakage.
Reassembly & Torque:
Replace every seal from the old cylinder with the corresponding new part from the COGENG kit.
When reassembling, tighten the gland nut and other fasteners to the manufacturer's specified torque values using a torque wrench. Do not overtighten.
Final Checks:
After reassembly and reinstallation, slowly cycle the boom cylinders several times without load to prime the system and seat the seals.
Check for leaks under low pressure first, then gradually increase to operating pressure. Monitor the cylinders closely during the first few hours of operation.



Frequently Asked Questions

Q: What equipment models use the 4320996 equivalent boom cylinder seal kit?
A: The 4320996 equivalent boom cylinder seal kit is designed to fit various excavator boom cylinders, most commonly associated with specific Doosan, Hyundai, and other heavy equipment makes where the OEM part number 4320996 is referenced. Applications can vary by cylinder model, production year, and machine configuration. Always verify this equivalent number against your cylinder's original seal kit reference or your machine's parts manual before ordering.

Q: What are the symptoms of failing boom cylinder seals?
A: Common symptoms include visible hydraulic oil leaking from the boom cylinder rod or gland area, reduced boom lifting or holding capacity, cylinder drift where the boom slowly drops under load, jerky or uneven boom movement, and external oil residue accumulating around the cylinder. Prompt seal replacement helps prevent more severe internal cylinder damage.

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