320D or 323D swing slow, noisy or jolting at reversal? A worn 148-4644 swing gearbox loses planetary reduction accuracy, making smooth cab positioning difficult. RITO supplies this heavy-duty Cat 320D swing gearbox assembly to restore backlash-controlled, jolt-free slewing.
Item NO.:
148-4644Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock148-4644 Swing Reduction Gearbox for Caterpillar 320D, 320D2, 323D and 324D excavators. Cross-reference: 1484644. Multi-stage planetary swing gearbox with heat-treated gear elements and factory-controlled backlash. Covers Cat 320D and 320D2 production ranges with one gearbox part number.
| Part Number | 148-4644 / 1484644 |
|---|---|
| Part Name | Swing Reduction Gearbox |
| Compatible Brand | Caterpillar |
| Applicable Models | 320D, 320D2, 323D, 324D Excavator |
| Application | Multi-stage planetary swing reduction for Cat 320D-series upper structure slewing |
| Material | Alloy steel gears, forged carrier, cast housing |
| Product Color | Industrial grey |
| Working Temperature | -30°C~+80°C |
| Key Function | Reduces swing motor speed and multiplies torque for Cat 320D-series upper structure rotation |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Reduction ratio matched to Cat 320D working swing speed, providing the correct slew speed for efficient dig-and-swing cycles without overloading the swing motor.
Gears carburised to HRC 58-62 for the surface fatigue resistance required for Cat 320D high-cycle quarry and demolition swing duty.
Assembly backlash controlled to OEM specification, eliminating the cab jolt at reversal that indicates worn planetary mesh on high-hour 320D machines.
148-4644 covers 320D, 320D2, 323D and 324D for direct bolt-on replacement without housing modification.
FAQ
Q: How to distinguish 148-4644 gearbox failure from swing motor failure on 320D?
A: Test swing motor case-drain flow. Normal drain with gear noise and metal in gearbox oil confirms gearbox failure. High case-drain confirms motor wear.
Q: What gear oil volume is required for 148-4644 on 320D?
A: Refer to the Cat 320D service manual for the exact fill volume. Use EP 90 or EP 140 and change at 50 hours after installation.
Q: Does 148-4644 fit the 320D2 without modification?
A: Yes. 148-4644 covers 320D and 320D2. Confirm motor input flange and pinion specification match before ordering.
Q: How to confirm 148-4644 is correct for my 320D?
A: Match part number 148-4644 or 1484644 and confirm machine is 320D, 320D2, 323D or 324D. Provide machine serial number for cross-reference.
Q: What quality options are available?
A: We provide original, OEM and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
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