Hitachi 4386648/9072631/UH181/ZX450/ZX470-5G/ZX490 Track Roller AS/Track Support Roller Group/supplied by DPW Machinery Parts

Product Specifications

Part Identification Breakdown

• Hitachi: The manufacturer of the original equipment (the excavator).

• 4386648 / 9072631: These are the core part numbers. 4386648 is likely the newer or primary aftermarket number, while 9072631 could be an older Hitachi OEM number or a competing aftermarket number. They are cross-referenced to mean the same part.

• UH181 / ZX450 / ZX470-5G / ZX490: This is the critical compatibility list. This track roller assembly fits multiple Hitachi excavator models across different series:

  • UH181: An older model from the "UH" series.

  • ZX450, ZX470-5G, ZX490: Modern models from the "ZX" series.

  • This indicates the part is used across several generations and sizes of Hitachi machines, which is common for shared undercarriage components.

• Track Roller AS / Track Support Roller Group: This is the description of the part.

  • Track Roller (or Bottom Roller): This is the roller that runs on the bottom of the track frame, directly supporting the machine's weight on the ground.

  • "AS" likely stands for "Assembly," meaning it's a complete unit ready to install.

  • "Group" confirms it's a full assembly, typically including the roller, shaft, bearings, seals, and sometimes the mounting brackets.

• Supplied by DPW Machinery Parts: This is the distributor or supplier of the part. DPW Machinery Parts is a company that sources and sells this component. They are not necessarily the manufacturer; they are the vendor.

Key Information About This Part

Function:
Track Rollers (Bottom Rollers) are fundamental undercarriage components with a critical job:

1. Support Machine Weight: They bear the primary weight of the excavator and distribute the load evenly along the track chain.

2. Guide the Track: They help maintain the alignment of the track chain as it travels around the track frame.

3. Reduce Friction: They allow for smooth rolling motion of the track.

Compatibility:
The listed models (UH181, ZX450, ZX470-5G, ZX490) are your key guide. However, it is always best practice to:

• Confirm the exact model and serial number of your machine.

• Physically inspect the old roller for any stamped part numbers.

• Compare the dimensions (flange diameter, width, bolt hole pattern) of the new part with the old one if possible.

Quality & Sourcing (DPW Machinery Parts):

• Supplier's Role: DPW Machinery Parts is the seller. The part itself could be manufactured by CQCTRACK (like your previous examples) or another aftermarket factory. You would need to ask DPW for the specific manufacturer.

• Aftermarket Quality: The same principles apply. This part will be significantly more cost-effective than a genuine Hitachi part. The quality can be very good, but it may not match the longevity of the OEM part in extreme applications. Reputable suppliers like DPW should offer a warranty.

What to Do Next / Sourcing & Verification

1. Verify with the Supplier (DPW Machinery Parts):

   • Contact DPW and provide them with the part numbers 4386648 and 9072631.

   • Confirm the exact machine models it fits, especially if your machine is a ZX470-5G or ZX490, as these are common models.

   • Ask them who the manufacturer is (e.g., CQCTRACK, ITR, etc.) and what warranty is provided.

2. Cross-Reference the Part Numbers:

   • Search online for "4386648 track roller" or "9072631 Hitachi". This will show you other suppliers offering the same part, allowing you to compare price and availability.

3. Confirm Your Machine Details:

   • Have your machine's model and serial number ready when you contact any supplier. This is the only way to guarantee 100% compatibility, especially since this part fits multiple models which might have subtle differences.

Summary

You have correctly identified a bottom track roller assembly for several large Hitachi excavator models (UH181, ZX450, ZX470-5G, ZX490). The part numbers you have are excellent for sourcing.

Your next step is to confirm pricing, availability, and warranty from DPW Machinery Parts (or other suppliers) and double-check the compatibility with your specific machine's serial number before purchasing.