COGENG 707-99-43740 Heavy-Duty Seal Kit for Komatsu

Technical Specifications & Performance Data

Component Specifications Table

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Compatible Which models is it used for Models

Decompose pictures


Parts list


Installation decomposition diagram
Key Constants & Technical Data:
Operating Pressure Range: Up to 35 MPa (≈ 5,076 PSI)
Temperature Range: -30°C to 110°C (-22°F to 230°F)
Seal Material: Nitrile rubber (NBR) / Polyurethane (PU) variants for different fluid compatibility
Surface Hardness (Seals): 70-90 Shore A
Friction Coefficient: < 0.25 (optimized for smooth cylinder movement)
Fluid Compatibility: Compatible with standard hydraulic fluids (mineral oil-based, synthetic, and biodegradable types)

Installation Notes:

1. Safety First: Relieve all hydraulic pressure and secure the cylinder before disassembly.

2. Clean Environment: Perform disassembly and assembly in a clean, dust-free area to prevent contamination.

3. Inspection: Check the cylinder bore, rod, and gland for scratches, pitting, or wear. Replace components if damage exceeds tolerances.

4. Seal Installation: Lubricate seals lightly with clean hydraulic fluid before installation. Avoid twisting or over-stretching seals.

5. Alignment: Ensure proper alignment during reassembly to prevent seal pinch or uneven wear.

6. Pressure Testing: After installation, conduct a gradual pressure test to verify leak-free performance before returning to full operation.

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...