ZAX120 pump displacement unstable or servo hunting on the left side? A worn 335308 left swashplate support cradle causes imprecise swashplate angle control, disrupting the flow output that the ZAX120's load-sensing circuit depends on. RITO supplies this precision left swashplate support to restore accurate servo displacement modulation.
Item NO.:
335308Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock335308 Swashplate Support Assembly (Left / L) for Hitachi HPK055K / HPK060 piston pumps on ZAX120, ZAX120-2, ZAX120-3 and ZX120-5G excavators. The left cradle provides the mirror-image bearing surface for the opposite swashplate pivot. Precise left-side cradle geometry is as critical as the right side for balanced, servo-accurate displacement control across the full ZAX120 load range.
| Part Number | 335308 |
|---|---|
| Part Name | Swashplate Support Assembly (Left) |
| Compatible Brand | TONG MYUNG (Hitachi HPK055K / HPK060 Pump) |
| Applicable Models | ZAX120, ZAX120-2, ZAX120-3, ZX120-5G Excavator |
| Application | Left swashplate cradle bearing and pivot support in HPK055K / HPK060 variable piston pump |
| Material | High-strength alloy steel |
| Product Color | Silver machined finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Provides the left bearing surface for accurate swashplate displacement modulation in HPK055K / HPK060 |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
335308 left-side cradle radius and pivot geometry matches the HPK055K left position precisely, ensuring balanced swashplate pivot movement without binding or tilt.
Precision ground bearing surface eliminates the friction that causes servo hunting and delayed displacement response during load-sensing adjustment cycles.
Covers ZAX120, ZAX120-2, ZAX120-3 and ZX120-5G across HPK055K and HPK060 variants.
Left and right supports should be replaced together when total pump hours are high to restore fully balanced swashplate servo control.
FAQ
Q: How do I know if the 335308 left swashplate support needs replacing?
A: Displacement hunting on the left section at steady engine speed, asymmetric flow output between left and right pump sections on a flow meter test, and visible scoring on the left swashplate bearing surface all indicate left support wear.
Q: Is 335308 left support the same as 335307 right support?
A: No. They are mirror-image components specific to their respective sides. Fitting 335308 in the right position causes swashplate geometry error and servo instability.
Q: What is the ZAX120 HPK055K servo specification for swashplate bearing clearance?
A: Refer to the Hitachi HPK055K service manual for the OEM swashplate cradle bearing clearance specification. Clearance above service limit causes swashplate tilt error that disrupts load-sensing flow modulation.
Q: How to confirm 335308 fits my ZAX120?
A: Verify pump model is HPK055K or HPK060 and existing left support part number is 335308. Provide pump 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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