Caterpillar (CAT) Excavator Front Idlers
Aftermarket front idlers (idler wheel) for Caterpillar (CAT) excavators. This page lists 5 OEM part numbers, so you can match your machine to the right number and ask for a quote.
Front idlers guide the track chain and work with the track adjuster to maintain correct track tension.
CAT front idler part numbers by model
| Model | OEM part number | Also fits | Class |
|---|---|---|---|
| CAT 320 | 9W-9444 | 320L, 320N | 20 t |
| CAT 320B | 113-2907 | 320C | 20 t |
| CAT 320D | 239-4341 | – | 20 t |
| CAT 330 | 6Y-8021, 112-9947 | 330B | 30 t |
When to replace front idlers
- Center guide ridge worn low or sharp
- Running surfaces worn so the links ride low
- Oil leaking at the seals
- Cracks at the rim
What to confirm before ordering
- OEM number on the old idler or in the parts book
- Idler only, or idler with yoke and bearing blocks
- Outside diameter and overall width
- Machine model and serial number
Part numbers can change within a model series. If your model is not listed, or you are unsure, send the OEM number or machine serial number and we will check it.
Ordering
| MOQ | 10 pcs per part number; mini excavator parts (up to 6 t) from 1 set per machine |
|---|---|
| Lead time | 7–25 days, depending on part type and quantity |
| Warranty | 12 months |
| Payment | T/T, L/C |
| Shipping port | Xiamen |