The COGENG 707-52-90610 (7075290610) is a premium OEM-grade hydraulic cylinder wear ring (guide ring) specifically engineered for Komatsu excavator hydraulic cylinders. This high-performance component provides critical metal-to-metal contact prevention between the piston/rod and the cylinder bore/gland, ensuring smooth operation, reduced friction, and extended cylinder life. Manufactured to meet or exceed original Komatsu specifications, this durable wear ring ensures reliable performance, optimal load distribution, and long service life in demanding construction and excavation applications.
Product Identification & Technical Data Sheet
| Parameter | Specification |
|---|---|
| Part Number | 707-52-90610 (Also written 7075290610) |
| Product Name | Komatsu Hydraulic Cylinder Wear Ring / Guide Ring |
| Supplier / Channel | COGENG (Aftermarket Parts Distributor) - Genuine Komatsu Part |
| Application | Piston Wear Ring (Prevents metal-to-metal contact between Piston OD and Cylinder Barrel ID) |
| Material | Phenolic Resin with Cotton/Fiberglass Fabric Base (High Load, Low Friction) |
| Color | Typically Brown / Tan / Reddish-Brown (Distinctive Komatsu fabric weave appearance) |
| Cut Style | Step-Cut (Scarf Cut) or Butt Cut - Allows installation over piston without stretching |
| Compatible Models | Komatsu PC200-6/7/8, PC220-6/7, PC300-6/7, PC400-6 (Multiple Cylinders: Boom, Arm, Bucket) |
WARNING: Component Fitment and Cylinder Reassembly Hazard
Sharp Edges: The 707-52-90610 wear ring is made of hard, woven phenolic material. When cut or machined, the edges are razor sharp and can easily slice fingers. Handle with gloves.
Sizing Interference: A new wear ring is oversized intentionally. DO NOT force the piston into the cylinder barrel using a hammer or the excavator's hydraulics if you feel extreme resistance. This will crack the new wear ring or score the barrel bore. Use a piston ring compressor tool or a nylon sleeve cone to compress the ring evenly.
Debris Contamination: If this 707-52-90610 ring is being replaced due to failure, it means the old ring disintegrated into the hydraulic system. MANDATORY: Flush all hydraulic lines and replace the Return Filter before starting the machine. Phenolic debris will destroy the hydraulic pump and main control valve spools within minutes.
| 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 Equipment Models | OEM Part Number | Component Type |
|---|---|---|
| PC150, PC160, PC180, PC200, PC228, BP500 | 707-52-90610 | Wear Ring / Guide Band |
| Note: | This wear ring is a direct replacement for Komatsu OEM part number 707-52-90610. It is a consumable component used in various hydraulic cylinders across the listed excavator and backhoe loader models. Compatibility is determined by the required dimensions for your specific cylinder. Always verify the size from your disassembled component or service manual. |
| Specification | Detail |
|---|---|
| Part Number | 707-52-90610 |
| 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.)
Specific Component Features
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 high side loads typical of excavator and backhoe operations.
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.
Typical Location: Installed in a groove on the piston or within the rod gland assembly of hydraulic 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.
Lubricate wear rings and cylinder bore with clean hydraulic oil
Insert piston into cylinder tube (use a tapered sleeve or chamfered tube edge)
Do not force – if tight, check for burrs or incorrect ring size
Complete cylinder assembly (install cylinder head, torque piston nut)
Reinstall cylinder on machine
Excluded Items: This listing is for the wear ring only. It does not include any seals, O-rings, pistons, rods, or other cylinder components.
Installation decomposition diagram
Remove arm cylinder from machine (support arm safely)
Drain hydraulic oil
Remove cylinder head (gland)
Pull piston rod assembly from tube
Remove piston nut (use rod clamp and breaker bar)
Slide piston off rod
Old wear rings will be split – simply pry out with a soft tool (plastic or brass)
Do not scratch the piston groove surfaces
Clean groove thoroughly with solvent and compressed air
Inspect piston for scoring or galling (replace piston if damaged)
Soak in warm hydraulic oil (40–50°C / 100–120°F) for 10–15 minutes
This makes the fabric-reinforced material flexible
Prevents cracking during installation
Do not stretch the ring more than necessary
Method 1 (easiest): Slide the split ring over the piston from the end (if piston has tapered lead-in)
Method 2 (split installation): Open the split slightly (no more than necessary) and snap into groove
Ensure the ring sits flat and fully seated in the groove
The split gap should be staggered if using two rings (gaps 180° opposite)
Rings should rotate freely in groove but not have excessive play
| Component | Torque (N·m) | Notes |
|---|---|---|
| Piston nut (arm cylinder, PC200‑8) | 400–600 | Use thread locker (Loctite 243) |
| Cylinder head (screw‑in) | 180–250 | Lubricate threads |
| Wear ring installation | N/A – hand fit | Ring should rotate in groove |
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...
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