| Parameter | Value / Specification |
|---|---|
| Material Composition | PTFE (Polytetrafluoroethylene) with Fiber Reinforcement |
| Temperature Range | -328°F to 536°F (-200°C to 280°C) |
| Coefficient of Friction | 0.04 - 0.12 (Dynamic, against steel) |
| Pressure Velocity (PV) Limit | Up to 20,000 psi-ft/min |
| Fluid Compatibility | Compatible with all standard hydraulic oils, synthetic fluids, water-glycol, and most industrial chemicals |
| Primary Function | Radial guidance, load bearing, prevention of metal-to-metal contact |
| Komatsu Part Number | Component Type | Typical Application |
|---|---|---|
| 707-52-90470 | Wear Ring / Guide Band | Komatsu Hydraulic Cylinders (PC Series Excavators) |
| Note: | This wear ring is a direct replacement for Komatsu OEM part number 707-52-90470. It is a consumable component used in various Komatsu hydraulic cylinders, most commonly in PC-series excavator boom, arm, or bucket cylinders. Compatibility is determined by the required dimensions for your specific cylinder. Always verify the size from your disassembled component or service manual. |
Part Number: 707-52-90470
Component Type: Hydraulic Cylinder Wear Ring / Guide Band
Material: Fiber-Reinforced PTFE Composite
Color: Natural White/Brown (Material Color)
Machining Standard: Precision CNC machined for consistent dimensions and square edges
Quantity: Sold Individually
(Note: The specific dimensions (ID, OD, Width) for this part number are not available in the search results. Please refer to your Komatsu parts catalog or measure the original component to confirm fit.)
Precision Dimensions: CNC-machined to exact OEM specifications for a perfect press-fit or slide-fit installation in its designated groove.
Engineered Material: Reinforced PTFE provides an optimal balance of wear resistance, low friction, and resistance to deformation under the high side loads typical of excavator operation.
Self-Lubricating: The PTFE matrix provides inherent lubricity, reducing friction and wear, which is critical for start-up and low-speed conditions.
Chemically Inert: Unaffected by standard hydraulic oils and most industrial chemicals, ensuring long-term stability in the hydraulic system.
Support Components & Context
Typical Location: Installed in a groove on the piston or within the rod gland assembly of excavator cylinders.
Works In Conjunction With: Piston seals, rod seals, and wipers. The wear ring's primary role is to protect these dynamic seals from excessive movement and extrusion, which is a leading cause of seal failure.
Excluded Items: This listing is for the wear ring only. It does not include any seals, O-rings, pistons, rods, or other cylinder components.
Cleanliness: Ensure the component groove, mating piston/rod, and cylinder bore are impeccably clean and free of debris, burrs, or old seal material.
Inspection: Before installation, inspect the mating metal surfaces for scoring, gouges, or excessive wear that could affect the wear ring's performance or cause premature failure.
Fit Check: The wear ring should be a snug, press-fit in its designated groove without excessive play. It should slide over the mating metal surface with light, even pressure.
Installation Method: For a tight fit, slightly warm the wear ring in clean, hot water (not exceeding 180°F / 82°C) to increase pliability. Use a smooth, flat tool to press it evenly into its groove. Never cut, file, or hammer the ring to fit.
Final Check: Once installed, ensure the wear ring sits flush and square in its groove. Verify that the piston or rod can move freely within the cylinder bore without binding.
DIMENSIONAL VERIFICATION REQUIRED: This wear ring is engineered for a specific cylinder application. The exact dimensions (ID, OD, Width) must be verified using the Komatsu parts catalog or by measuring the original component before purchase. Using a ring with incorrect dimensions will lead to improper guiding, rapid seal failure, cylinder binding, or catastrophic damage.
NOT A HYDRAULIC SEAL: This component is a guide and load-bearing ring only. It provides ZERO hydraulic sealing function. It must always be used in conjunction with the appropriate piston seals or rod seals from a complete rebuild kit.
SURFACE CONDITION: Installing a new wear ring on a severely worn, scored, or out-of-round piston or cylinder bore is ineffective and will not restore proper cylinder function. The metal surfaces must be within serviceable limits.
| Application Sector | Typical Use | Purpose & Benefit |
|---|---|---|
| Excavator Cylinder Rebuild | Komatsu PC Series Excavators | Replaces worn guide bands in boom, arm, or bucket cylinders to restore proper piston/rod alignment and prevent seal extrusion. |
| Heavy Equipment Maintenance | Preventative Overhaul of Hydraulic Cylinders | Extends the life of the entire cylinder assembly by absorbing side loads, preventing costly damage to seals and metal surfaces. |
| Hydraulic Repair Shops | Professional Cylinder Rebuilding | Ensures smooth, non-binding cylinder operation under extreme radial loads, maintaining machine precision and reliability. |
Disclaimer: This product is manufactured as an OEM-equivalent replacement part. All manufacturer names, part numbers, and descriptions are used for reference purposes only. COGENG is not affiliated with Komatsu Ltd. For specific application details and installation procedures, always consult the original Komatsu equipment documentation. Specifications subject to change without notice.
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.
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