CAT 320D - Conventional - AZR Series

Yes. The aftermarket CAT Caterpillar 320D undercarriage parts offered by Propel Parts are engineered as direct replacement components for 320D excavators and are designed to meet or exceed OEM specifications for fit, function, and performance. Compatibility depends on your machine serial number prefix. This guide covers serial prefixes AZR, BWZ, DFT, EBT, and SNS. If you are unsure which serial prefix applies to your machine, check the serial number plate on your excavator or contact us before ordering.

No, you can place your order normally. After ordering, simply provide your machine serial number through our Exact Fit Guarantee process. Our team will verify compatibility before shipment to ensure the correct parts are supplied. This guide covers Caterpillar 320D conventional undercarriage machines with serial prefixes AZR, BWZ, DFT, EBT, and SNS.

Common replacement components for the Caterpillar CAT 320D include Sealed and Greased Track Chains, Track Shoes, Lower Rollers (Bottom Rollers), Top Carrier Rollers, Front Idlers, Sprockets (21T-16BH), and Track Tensioning Components. These are commonly replaced during routine maintenance and complete undercarriage rebuilds.

A complete CAT 320D undercarriage rebuild typically requires 2 track chains, 90 track shoes per side, lower rollers (confirm quantity for your specific machine), 4 top carrier rollers, 2 front idlers, 2 sprockets, and track tensioning components. Additional hardware such as track bolts, nuts, and track guiding guards may also be required depending on wear.

Note: For machines with serial prefixes AZR, BWZ, DFT, EBT, and SNS, confirm chain link count and bottom roller quantity before ordering as these may vary within this serial range.

CAT 320D track shoes are available in several configurations: Single Grouser (600mm, 700mm, 800mm), Double Grouser (600mm, 700mm), Triple Grouser (600mm, 700mm, 800mm), and 600mm Rubber Roadliner Pads. The right choice depends on your traction and flotation requirements.

When replacing your CAT 320D track chains, inspect the track shoes, sprockets, lower rollers, carrier rollers, and front idlers. Replacing worn mating components at the same time helps maximize the lifespan of your new track chains and prevents premature wear.

The standard track specifications for the CAT 320D conventional undercarriage (serial prefixes AZR, BWZ, DFT, EBT, SNS) are: Pitch 7.50, Bolt Diameter 20mm, Link Height 105mm, and Bushing Outside Diameter (O.D.) 58.7mm.

Track hardware is typically sold separately. When replacing Caterpillar 320D track shoes, you will need 20mm track bolts (20mm x 55mm for triple grouser shoes, or 20mm x 63mm for single and double grouser shoes) and 20mm track nuts. It is recommended to use new hardware when installing new track shoes.

If you're doing a complete undercarriage replacement on a Caterpillar 320D (serial prefixes AZR, BWZ, DFT, EBT, SNS), here's a full parts and hardware reference. Confirm bottom roller quantity and chain link count for your specific machine before ordering.

Main Undercarriage Components

Hardware (by Assembly)

Quantities shown are for the full machine (both sides). Actual requirements may vary based on your machine's serial number prefix and configuration. Use your serial number through our Exact Fit Guarantee process to confirm fitment before ordering.

Our Exact Fit Guarantee is designed to prevent ordering errors. After placing your order, provide your machine serial number and our team will verify compatibility before shipping. If a fitment issue is identified, we will work with you to ensure the correct replacement parts are supplied for your CAT 320D excavator.