COGENG 878000486 Premium Hydraulic Cylinder Seal Kit for Komatsu Excavators

Technical Specifications & Performance Data

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Component Specifications Table

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Compatible Komatsu Excavator Models

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Hydraulic System Specifications

Decompose pictures

Parts list

Installation decomposition diagram
Pre-Installation Requirements:
Safety Preparation
Completely depressurize hydraulic system
Secure excavator on level ground with arm supported
Support arm cylinder properly during disassembly
Wear appropriate personal protective equipment
Workspace Preparation
Clean cylinder exterior thoroughly
Use clean, organized work area
Verify kit completeness before starting
Prepare proper seal installation tools

Installation Procedure:
Disassembly Steps
Mark cylinder components for reassembly alignment
Carefully remove gland nut and piston assembly
Document seal orientation and position
Clean all components with non-petroleum solvent
Seal Installation
Lubricate all seals with clean hydraulic fluid
Use seal installation tools - avoid sharp instruments
Ensure proper orientation of directional seals
Verify seals are fully seated in grooves
Reassembly Specifications
Gland nut torque: 750-800 Nm (553-590 ft-lbs)
Ensure proper rod alignment during assembly
Cycle cylinder slowly to distribute fluid

Commissioning Procedure:
Initial Operation
Cycle cylinder several times without load
Check for external leakage at all connections
Monitor hydraulic fluid temperature
Verify smooth arm movement
Performance Verification
Check for drift under load
Verify cylinder speed matches specifications
Monitor for unusual noises or vibration
Conduct operational testing with digging loads

Performance & Durability Data

Maintenance & Troubleshooting Guide

Preventive Maintenance Schedule:

• Visual inspection: Every 500 operating hours

• Leakage check: Monthly or 250 hours

• Performance monitoring: Daily operational checks

• Fluid analysis: Every 2,000 hours

Troubleshooting Common Issues:

• External Leakage: Verify seal installation and surface conditions

• Internal Leakage: Check piston seal integrity and cylinder wear

• Slow Operation: Inspect for contamination or viscosity issues

• Jerky Movement: Check for air in system or seal damage

• Overheating: Verify proper lubrication and pressure settings

Quality Assurance & Warranty

• Warranty Period: 18 months or 3,000 operating hours

• Quality Certifications: ISO 9001:2015, ISO 14001:2015

• Testing Protocol: 100% dimensional and material verification

• Material Traceability: Full batch tracking available

• Technical Support: Expert assistance for installation and troubleshooting

Frequently Asked Questions
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?

A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.

A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.

A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?

A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.

A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.

A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.

A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
A : Which payment terms can you accept?
Q : Paypal. Western Union, Bank Transfer, T/T...