For 1st Gen — later serial range: 2DL1710 and up, 4ZJ576 and up
Shop 320 undercarriage parts for Caterpillar 320 excavators equipped with a 1st Gen — later serial range: 2DL1710 and up, 4ZJ576 and up undercarriage. This guide covers the serial number ranges below and helps identify 320 track chains, 320 track rollers, and other major components commonly replaced during undercarriage maintenance, repair, and complete undercarriage rebuilds.
Order normally. After ordering, provide your machine serial number through our Exact Fit Guarantee process and our team will verify compatibility before shipment.
➜ Ready to shop? Review the guide below, then browse the product listings for available 320 excavator undercarriage parts, pricing, and current availability.
CAT 320 Serial Prefix Guide
This guide covers the following Caterpillar 320 serial prefixes:
2DL4ZJ
Common CAT 320 Undercarriage Components
The components below represent the most commonly replaced 320 undercarriage parts for machines with a 1st Gen — later serial range: 2DL1710 and up, 4ZJ576 and up setup. Click any linked component to view pricing and availability.
In addition to the major undercarriage components shown above, we may also offer mounting hardware, track hardware, idler hardware, track tensioning components, track guiding guards, seals, and related undercarriage parts.
Track Shoe Options: 320 track shoes are available in Triple Grouser (600mm, 700mm, 800mm) options depending on application.
➜ Ready to order? Browse the product listings below to view available Caterpillar 320 track chains, track shoes, rollers, idlers, sprockets, track tensioning components, hardware, pricing, and current availability.
Replacing Bottom Rollers? Inspect carrier rollers, idlers, and chain wear.
Replacing Idlers? Inspect recoil spring and track tensioning components.
Commonly Purchased Together
Replacing Track Chain (45L)s?
Customers commonly inspect or replace:
Track shoes
Sprockets
Track hardware
Replacing Bottom Rollers?
Customers commonly inspect or replace:
Top carrier rollers
Front idlers
Track chain wear
Planning a Complete Undercarriage Rebuild?
A typical rebuild may include:
• Track chains
• Track shoes
• Bottom rollers
• Front idlers
• Carrier rollers
• Sprockets
Exact Fit Guarantee
Order with confidence. After placing your order, provide your machine serial number through our Exact Fit Guarantee process and our team will verify fitment before shipment. If a fitment issue is identified before shipment, we will work with you to ensure the correct parts are supplied.
Are these aftermarket undercarriage parts compatible with my Caterpillar 320 (1st Gen Late) excavator?
Yes. The aftermarket CAT Caterpillar 320 undercarriage parts offered by Propel Parts are engineered as direct replacement components for 320 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 the 1st Gen Late configuration with serial prefixes 2DL, 4ZJ. If you are unsure, provide your serial number and our team will verify fitment before shipment.
Do I need to provide my serial number before ordering CAT 320 undercarriage parts?
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 320 1st Gen Late undercarriage machines with serial prefixes 2DL, 4ZJ.
What undercarriage parts are commonly replaced on a CAT 320 (1st Gen Late) excavator?
Common replacement components for the Caterpillar CAT 320 include Sealed and Greased Track Chains, Track Shoes, Lower Rollers (Bottom Rollers), Top Carrier Rollers, Front Idlers, Sprocket Segments, and Track Tensioning Components. These are commonly replaced during routine maintenance and complete undercarriage rebuilds.
What is included in a complete Caterpillar 320 (1st Gen Late) undercarriage rebuild?
A complete CAT 320 undercarriage rebuild typically requires 2 track chains, 90 track shoes (varies by side), 14 lower rollers, 4 top carrier rollers, 2 front idlers, 2 sprockets, and recoil springs. Additional hardware such as track bolts, nuts, and track guiding guards may also be required depending on wear.
What track shoe options are available for the CAT 320 excavator?
CAT 320 track shoes are available in several configurations: Triple Grouser (600mm, 700mm, 800mm) and heavy-duty options. The right choice depends on your machine's operating environment and flotation requirements.
What should be inspected when replacing Caterpillar 320 track chains?
When replacing your CAT 320 track chains, inspect the track shoes, sprockets, lower rollers, carrier rollers, and idlers. Replacing worn mating components at the same time helps maximize the lifespan of your new track chains and prevents premature wear.
What are the track specifications for the Caterpillar 320 excavator?
The standard track specifications for the CAT 320 (45L) undercarriage are: Pitch 7.50", Bolt Diameter 3/4" (20mm), Link Height 105mm, and Bushing Outside Diameter (O.D.) 58.7mm.
Are track bolts and nuts included with CAT 320 track shoes?
Track hardware is typically sold separately. When replacing Caterpillar 320 track shoes, you will need 3/4" (20mm) track bolts and nuts. It is highly recommended to use new hardware when installing new track shoes to ensure proper torque and prevent loosening.
What parts do I need to replace the full undercarriage on a CAT 320?
If you're doing a complete undercarriage replacement on a Caterpillar 320, here's a full parts and hardware reference based on standard machine configuration:
Main Undercarriage Components
Component
Qty per Machine
Track Chain — Sealed & Greased
2 (1 per side)
Track Shoes (600mm, 700mm, or 800mm)
90 (45 per side)
Lower Rollers (Bottom Rollers)
14 (7 per side)
Top Carrier Rollers
4 (2 per side)
Front Idlers
2 (1 per side)
Sprocket Segments
2
What happens if I order the wrong Caterpillar 320 undercarriage part?
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 320 excavator.
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