707-44-16910 Komatsu Ring

The 707‑44‑16910 ring (also referenced by part number 6754116910) is a seal/backup ring used in hydraulic cylinder assemblies and other Komatsu systems to help maintain proper sealing pressure and support internal components. It helps ensure fluid retention and smooth movement in joints such as hydraulic cylinders.

Here’s a general guide for proper installation:

1. Turn off the equipment and relieve all system pressure before servicing.
2. Remove the cylinder or housing where the ring is installed.
3. Carefully extract the old ring to avoid scratching the bore or damaging mating parts.
4. Clean the groove and sealing surfaces thoroughly.
5. Insert the new 707‑44‑16910 ring into the groove, ensuring it sits properly and is oriented correctly.
6. Reassemble the cylinder or component, reapply lubricant as required, and then test the system for proper sealing under pressure.

The 707‑44‑16910 ring fits many Komatsu excavators and loaders where this part number is specified for hydraulic cylinder and seal applications. Models noted for compatibility include PC300‑8, PC350‑8, PC400‑8, PC450, PC490, PC550, PC600, along with various wheeled machines and other Komatsu equipment in similar applications. If you are unsure don’t hesitate to reach out to Propel Parts for help verifying fitment.

Yes. This ring is manufactured to meet or exceed OEM specifications for fit and durability. Aftermarket versions like the one offered on Propel Parts are quality‑checked to ensure they perform comparably to the original Komatsu part and provide reliable sealing performance under heavy‑duty operating conditions.

Hydraulic seal rings should be inspected as part of routine hydraulic system maintenance or whenever the cylinder or related components are serviced. Check for wear, cracks, or deformation. Replace the ring if you notice leakage, inconsistent cylinder movement, or visible deterioration.

Typical indicators include:

1. Fluid leakage around the hydraulic cylinder or connection
2. Reduced hydraulic performance or loss of pressure
3. Rough or inconsistent movement in the cylinder
4. Visible wear, cracks, or deformation on the ring

A quality ring ensures effective sealing and internal support in hydraulic systems, which helps maintain fluid pressure, protect moving parts, and prevent contamination. Parts that meet or exceed OEM standards improve equipment reliability, reduce unscheduled maintenance, and extend the life of hydraulic cylinders and related components.