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702-21-55520 Komatsu Seal O Ring
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Description for 702-21-55520 Seal O Ring
▶Specification for 702-21-55520 Seal O Ring
▶| Dimensions | 0.94x0.94x0.04 |
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Frequently Asked Questions
What is the 702-21-55520 O-ring seal used for?
The 702-21-55520 O-ring seal sits in a groove and is compressed between two surfaces to block fluid or air leakage. Its elasticity is what creates a tight, reliable seal.
How do I install the 702-21-55520 O-ring seal?
Fitting the 702-21-55520 correctly comes down to clean surfaces and following the manual’s sequence. Work through these steps:
- Depressurize the system and shut the machine down before service
- Remove the old O-ring and clean the groove thoroughly
- Inspect the groove and mating face for nicks or debris
- Lubricate the 702-21-55520 as directed and seat it evenly in the groove
- Reassemble carefully so the O-ring isn’t pinched, then check for leaks
Which Komatsu machines is the 702-21-55520 compatible with?
The 702-21-55520 is matched to particular Komatsu equipment, so always verify the application against your parts reference before purchasing. Or reach out to Propel Parts for help verifying fitment.
Does the 702-21-55520 O-ring seal meet performance standards?
Yes. Propel Parts supplies the 702-21-55520 as a premium aftermarket part made to meet OEM specifications. When replacing, choose genuine or high-quality aftermarket parts that meet or exceed OEM specifications so you can fit it with confidence.
How often should the 702-21-55520 be replaced?
Replace the 702-21-55520 whenever the assembly it serves is overhauled, or any time it shows wear, damage, or corrosion. Following the intervals in your service manual is the best guide. This part is commonly replaced alongside the 07145-00040 Dust Seal, so it is worth checking both while the assembly is open.
What are the signs of a worn or failing 702-21-55520 O-ring seal?
When the 702-21-55520 reaches the end of its service life, the symptoms tend to show up first as performance or wear issues. Look for:
- Leaks or weeping at the sealed connection
- A flattened, nicked, or hardened ring on removal
- Loss of pressure in the circuit
- Swelling or extrusion from the groove
Why is the 702-21-55520 O-ring seal important, and what related part is commonly replaced with it?
Replacing the 702-21-55520 when needed keeps the system within its designed clearances and loads, which extends the life of the surrounding parts and supports dependable performance. The 02896-21018 Seal O-Ring is commonly serviced together with this part, so it is worth replacing both while access is available.
Shipping
We know equipment downtime costs money, so fast and reliable shipping is a priority at Propel Parts. Orders placed on weekdays before 3:00 PM ET typically ship the same day, with expedited delivery options available for many locations when time is critical.
We ship across the U.S., Canada, and over 130 countries worldwide, helping customers keep machines running wherever they operate. Available shipping methods and delivery estimates are shown at checkout so you can select the option that best fits your timeline.
Tracking information is emailed within 24–48 hours after your order is processed, giving you full visibility from dispatch to delivery and peace of mind that your parts are on the way.
Easy Returns
Our refund policy is simple. We offer a 30-day, no-hassle return policy, and we make every effort to provide the best service and highest-quality parts possible. If you’re not fully satisfied with your purchase, you may return it within 30 days for a refund. Full details are available on our Returns Policy page.
Warranty
Buy with confidence. All parts from Propel Parts are covered against material or manufacturer defects for 12 months from the original invoice date. We stand behind every part we sell, so you can count on reliable performance and dependable support. Full details are available on our Warranty Policy page.
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