| Parameter | Specification |
|---|---|
| COGENG Part Number | 707-98-42540 |
| OEM Equivalent | Komatsu 707-98-42540 |
| Product Type | Hydraulic Cylinder Seal Kit |
| Application | Wheel Loader Hydraulic Cylinders |
| Kit Type | Complete overhaul seal kit |
| Parameter | Value / Specification |
|---|---|
| Maximum Operating Pressure | Up to 4,060 PSI (280 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Mineral-based hydraulic oils, Komatsu Super Hydraulic Fluid (KSHV), synthetic HFDU fluids |
| Primary Seal Material | Polyurethane (AU), Cast Polyurethane (CU), Nitrile Rubber (NBR) |
| Seal Hardness (Dynamic) | 90-94 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Design Standard | Manufactured to meet or exceed Komatsu's original specifications for pressure holding, wear resistance, and service life in loader applications. |
| Item | Description | Quantity | Material |
|---|---|---|---|
| 1 | Piston Seal (Primary) | 2 | Polyurethane |
| 2 | Rod Seal (Step-cut) | 2 | NBR + PTFE |
| 3 | Wiper Seal (Double-lipped) | 2 | Polyurethane |
| 4 | Buffer Seal | 2 | Polyurethane |
| 5 | Wear Ring (Piston) | 2 | PTFE Composite |
| 6 | Wear Ring (Gland) | 2 | PTFE Composite |
| 7 | O-Ring (Gland to barrel) | 2 | HNBR |
| 8 | O-Ring (Piston to rod) | 2 | HNBR |
| 9 | O-Ring (End cap) | 4 | HNBR |
| 10 | Backup Ring (Various) | 4 | Nylon 66 |
| 11 | Dust Seal (Rod wiper) | 2 | Polyurethane |
| Komatsu Wheel Loader Model | OEM Part Number | Cylinder Application |
|---|---|---|
| Komatsu WA200-5 | 707-98-42540 | Hydraulic Cylinder (Verify: Lift, Bucket, or Steering) |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-98-42540. It is designed for specific hydraulic cylinders on the WA200-5 wheel loader. The exact cylinder application (lift, bucket, or steering) must be verified through Komatsu's official parts documentation or service manual before purchase. |
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Main Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 94 Shore A | Primary dynamic pressure seal on piston |
| Rod Seal (Step Seal) | Cast Polyurethane (CU) | Black | 93 Shore A | Main rod seal for pressure retention |
| Wiper/Scraper | Polyurethane (PU) | Black | 90 Shore A | Excludes dirt, dust, and moisture from rod |
| Buffer Ring | Polyurethane (CU) | Black | 90 Shore A | Protects rod seal from pressure spikes |
| O-Ring Kit (Assorted) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static sealing for gland, end cap, and ports |
| Wear Ring / Guide Band | Glass-Filled PTFE | Dark Brown | N/A | Centralizes piston, prevents metal contact |
| Backup Rings | Nylon 6.6 | Tan | N/A | Prevents extrusion of static O-rings under pressure |
| Dust Seal | Polyurethane | Black | 85 Shore A | Secondary contaminant exclusion |
Main Piston Seal (U-Cup) – Qty: 1
Rod Seal (Step Seal) – Qty: 1
Wiper/Scraper – Qty: 1
Buffer Ring – Qty: 1
Wear Ring (Piston) – Qty: 1
Dust Seal – Qty: As required
Complete O-Ring & Backup Ring Set – Qty: 1 Set (All necessary sizes for gland and port assembly)
Note: This kit provides a complete seal profile set designed to match the exact specifications of the original Komatsu 707-98-42540 kit for the WA200-5 application. An exploded diagram is included for correct assembly.
Full set of precision-molded static O-rings for all gland and port connections
Essential wear guide band to ensure smooth piston travel and minimize side load on seals
Required high-pressure nylon backup rings
Excluded Items: This is a seal and wear component kit only. It does NOT include the piston, cylinder rod, barrel, gland nut, bearings, bolts, pins, or any other metal parts or hardware.
| Cylinder Type | Bore Diameter | Rod Diameter | Kit Application |
|---|---|---|---|
| Bucket Cylinder | 90mm | 55mm | ✓ Included |
| Boom (Lift) Cylinder | 100mm | 60mm | ✓ Included |
| Tilt Cylinder | 80mm | 50mm | ✓ Included |
Installation decomposition diagram
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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