CAT 320, 322, 325, 330 Final Drive Part Numbers (Complete Guide)
When working with excavators from Caterpillar Inc., understanding final drive part numbers, gearbox components, and compatibility across models is critical for repairs, rebuilds, and sourcing replacements.
This guide covers:
- Complete final drive assemblies
- Gearbox & internal parts
- Travel motor components
- Massive OEM part number lists
- Cross-compatible CAT excavator models
What Is a CAT Final Drive?
A final drive is the component that converts hydraulic motor power into torque to drive the tracks.
It consists of:
- Hydraulic travel motor
- Planetary gearbox
- Bearings & shafts
- Sealing system
👉 Important:
The final drive = motor + gearbox combined
Complete CAT Final Drive Assembly Part Numbers
Below is a large expanded list of real OEM and cross-reference part numbers used across CAT 320, 322, 325, and 330 excavators.
🔹 Primary OEM assemblies
- 148-4696
- 148-4695
- 227-6948
- 227-6949
- 227-6035
- 353-0611
- 353-0615
- 353-0609
- 199-4584
- 296-6299
- 521-3340
- 521-3341
- 7I-7704
- 270-8170
- 135-6179
- 136-2938
- 114-1483
- 114-1488
Final Drive Gearbox (Planetary) Part Numbers
These parts sit inside the final driveÂ
🔹 Gears & carriers
- 169-5590 → gearbox gear
- 7Y-1555 → planetary gear component
- 227-6948 → planetary group
- 353-0611 → gearbox housing group
🔹 Structural gearbox parts
- 094-0580 → distance plate
- 353-0609 → housing
- 296-6299 → carrier assembly
Travel Motor Part Numbers (Hydraulic Side)
These are bolted to the gearbox:
- 107-7028 → travel motor w/ brake valve
- 7Y-1555 → motor-related component
- 227-6035 → motor + gearbox group
Internal Final Drive Parts Breakdown
Use this section in your blog for exploded diagram SEO content.
🔹 Planetary system:
- Sun gear
- Planet gears
- Ring gear
- Carrier assemblies (stage 1 / stage 2 / stage 3)
🔹 Bearings & shafts:
- Axle shafts
- Needle bearings
- Taper roller bearings
🔹 Sealing system:
- Duo cone seals
- Floating seals
- O-rings
🔹 Known service parts:
- 6W-4310 → seal-related component (example from field repairs)
- 9H-0846 → sealing hardware
- 363-4454 → duo cone seal (common failure item from technician discussions)
Cross-Compatible CAT Excavator Models
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These models often share the SAME or VERY SIMILAR final drives:
🔹 Core compatibility range
- CAT 318 / 318C
- CAT 320 (B, C, D, E)
- CAT 321
- CAT 322
- CAT 323
- CAT 324
- CAT 325
- CAT 326
- CAT 329
- CAT 330
Example Compatibility Table
| Part Number | Description | Fits Models |
|---|---|---|
| 148-4696 | Complete Final Drive | 320C/D, 322, 323 |
| 227-6948 | Final Drive Group | 320–325 |
| 353-0611 | Gearbox Housing | 320–330 |
| 094-0580 | Distance Plate | 311–336 |
| 169-5590 | Gear | 320–329 |
| 107-7028 | Travel Motor | 320–330 |
 Left vs Right Final Drive (CRITICAL)
Many people get this wrong.
From real technician discussions:
“Both sides have separate part numbers… need serial number”
Key facts:
- Left and right drives can differ
- Hose routing + brake setup varies
- Some are interchangeable, some are NOT
Serial Number (PIN) — Why It Matters
You must include this in your blog:
CAT part numbers CANNOT be confirmed without the machine serial number.
Reasons:
- Engineering updates
- Regional specs
- Different gear ratios
- Multiple suppliers
Common Failure Parts
These fail most often:
- Duo cone seals
- Outer bearings
- Planet gears
- Carrier assemblies
👉 Real-world mechanic insight:
“Only thing that fails… outer bearing and duo seals”
Extended Part Number List
Final Drive & Gearbox Numbers:
- 114-1483
- 114-1488
- 135-6179
- 136-2938
- 148-4695
- 148-4696
- 199-4584
- 227-6035
- 227-6948
- 227-6949
- 270-8170
- 296-6299
- 353-0609
- 353-0611
- 353-0615
- 521-3340
- 521-3341
- 7I-7704
- 7Y-1555
Please contact us today at sales@proconstructionparts.com
