Left-circuit travel or swing slow on your ZAX120 or ZX120-5G? A worn 335302 left cylinder barrel forces the HPK055K / HPK060 left section to bypass internally, leaving travel circuits short of the flow needed for normal excavating speed. RITO supplies this Tong Myung left barrel-and-valve-plate pair to restore ZAX120 left-pump output.
Item NO.:
335302Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock335302 Piston Pump Block with Valve Plate (Left) for Hitachi HPK055K / HPK060 piston pumps on ZAX120, ZAX120-2, ZAX120-3 and ZX120-5G excavators. The HPK060 left section drives travel and swing priority flow. Barrel and valve plate are matched-lapped together so the sealing interface is correct from the first stroke, without a break-in period of reduced efficiency.
| Part Number | 335302 |
|---|---|
| Part Name | Piston Pump Block with Valve Plate (Left) |
| Compatible Brand | TONG MYUNG (Hitachi HPK055K / HPK060 Pump) |
| Applicable Models | ZAX120, ZAX120-2, ZAX120-3, ZX120-5G Excavator |
| Application | Left section rotating group of HPK055K / HPK060 tandem piston pump |
| Material | Alloy steel barrel, phosphor-bronze composite valve plate |
| Product Color | Silver barrel / gold valve plate |
| Working Temperature | -25°C~+60°C |
| Key Function | Generates left-circuit flow for ZAX120 travel and swing circuits |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Correct left-barrel displacement restores the flow available to the HPK060 travel-priority circuit, normalising ZAX120 travel speed and responsiveness after installation.
Port geometry matched to HPK055K / HPK060 left-section specification, preventing cross-port leakage between left and right circuits under combined boom-travel loading.
Barrel face and valve plate lapped together to Ra 0.1 finish for immediate sealing efficiency without a break-in period of reduced volumetric output.
335302 covers ZAX120, ZAX120-2, ZAX120-3 and ZX120-5G, simplifying spare parts management for ZAX120 fleet operators.
FAQ
Q: How to distinguish left-barrel failure from right-barrel failure on ZAX120?
A: Perform a split-flow test. Low left-section outlet pressure with normal right-section pressure, combined with high left case-drain flow, confirms 335302 left barrel or valve plate wear.
Q: Is 335302 the same part as 335301?
A: No. 335302 is the left section and 335301 is the right section of the HPK055K / HPK060 tandem pump. They are not interchangeable due to different port geometry.
Q: What fluid should I use after replacing 335302 on ZAX120?
A: Hitachi ZAX120 specifies ISO VG 46 anti-wear hydraulic oil. Replace the return-line filter and suction strainer before filling, and run at low pressure for 30 minutes before applying full load.
Q: How to confirm 335302 fits my ZAX120 HPK060 pump?
A: Verify pump model is HPK055K or HPK060 and existing left barrel part number is 335302. Provide pump and machine serial numbers for our team to 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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