Right-circuit pressure falling on your ZAX120 or ZX120? A worn 335301 right cylinder barrel and valve plate allows the HPK055K / HPK060 right section to lose volumetric efficiency. RITO supplies this Tong Myung matched right barrel-and-valve-plate pair so the ZAX120 right pump section recovers rated output from installation.
Item NO.:
335301Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock335301 Cylinder Barrel with Valve Plate (Right) for Hitachi HPK055K / HPK060 piston pumps on ZAX120, ZAX120-2, ZAX120-3 and ZX120-5G excavators. This compact pump's right section governs priority circuits on the ZAX120. Matched lapping between barrel face and valve plate achieves the sealing clearance needed for high volumetric efficiency at the compact HPK055K operating pressure.
| Part Number | 335301 |
|---|---|
| Part Name | Cylinder Barrel with Valve Plate (Right) |
| Compatible Brand | TONG MYUNG (Hitachi HPK055K / HPK060 Pump) |
| Applicable Models | ZAX120, ZAX120-2, ZAX120-3, ZX120-5G Excavator |
| Application | Right 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 right-circuit hydraulic flow and pressure in the HPK055K / HPK060 tandem pump |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Port timing and spline geometry specific to the HPK055K / HPK060 right section, preventing the port mismatch that generates excess cross-port leakage on compact Hitachi pumps.
Barrel face and valve plate lapped as a pair to Ra 0.1, establishing an immediate sealing interface without the break-in efficiency loss typical of unmatched replacement parts.
335301 covers ZAX120, ZAX120-2, ZAX120-3 and ZX120-5G, addressing multiple ZAX120 production generations with one part number.
Barrel bore and valve plate port geometry optimised for the compact HPK055K pump operating pressure and speed range, maintaining rated volumetric efficiency in the smaller displacement envelope.
FAQ
Q: What are the signs the 335301 right barrel is failing on my ZAX120?
A: Right-circuit actuators (boom or arm depending on circuit layout) slow or lose force, right-section case-drain flow exceeds OEM spec, and the pump case temperature is higher than the left section after 30 minutes of operation.
Q: Is 335301 the same as 335302?
A: No. 335301 is the right-section barrel and 335302 is the left-section barrel. They differ in port orientation and are not interchangeable. Confirm right or left position before ordering.
Q: Should I replace the valve plate together with the 335301 barrel?
A: Yes. The barrel face and valve plate are a matched pair. Installing a new barrel against an old valve plate creates an immediate sealing mismatch that generates excessive leakage.
Q: How to confirm 335301 fits my ZAX120 HPK055K pump?
A: Verify pump model is HPK055K or HPK060 and existing right barrel part number is 335301. Provide pump serial number to our team 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
RITO Hydraulic Pump Cylinder Block 141634 is designed for EX200-1, EX220-1, HPV116, and HMG32 main pumps. For distributors and agents: standardized dimensions ensure drop-in replacement, reducing return rates. Mining customers benefit from high-wear resistance, minimizing unplanned pump failures.
View More
This RITO 720773 Cylinder Block Front is a critical core component for K3V112DT, K3V63, and K3V140 excavator hydraulic pumps, forming part of the rotating group assembly. It works with pistons and valve plates to ensure stable pressure generation, precise flow output, and efficient hydraulic performance in construction environments.
View More
Hydraulic efficiency loss in excavators leads to sluggish cycles and high fuel costs. Worn cylinder blocks and valve plates cause internal leakage, paralyzing your fleet. The 720773 and K3V112DT series resolve these critical failures, restoring system pressure for heavy-duty construction demands.
View More
Worn piston shoes cause catastrophic internal friction and pressure loss in main pumps, leading to expensive machine downtime. The 704543A slipper addresses these vulnerabilities. Engineered for high-load mining, it prevents "slipper tilt" and scoring that often plagues inferior low-cost parts.
View More
The RITO Hydraulic Pump Valve Plate 641202 is designed for high-efficiency and durable performance in demanding excavator applications such as the Komatsu PC200-7, PC200-8, and MB85. Whether for wholesale or direct mining applications, this valve plate improves hydraulic flow and pump reliability. Unlike traditional valve plates, it ensures a longer operational lifespan, reducing maintenance costs and downtime. This makes it a critical component for heavy-duty machinery in challenging environments. The 641202 enhances performance by providing superior seal integrity and operational stability, crucial for minimizing operational disruptions.
View More
Facing frequent downtime & high replacement costs on excavator friction parts? RITO Bronze Friction Plate 648012 solves core pain: unstable friction, rapid wear & poor heat resistance. Ideal for wholesalers, agents & mine clients; fits Komatsu PC160-7, JCB JS160, Takeuchi TB135, MSF85P. Delivers consistent torque, lower maintenance & longer service life.
View More
Generic separators fail in heavy mining/construction, causing premature wear, hydraulic system damage, and costly delays. Solution：RITO Steel Separation Plate 648013 delivers OEM-grade durability, perfect fit for Komatsu PC160-7, JCB JS160, Takeuchi TB135, MSF85P, and reliable aftermarket support to cut costs and maximize uptime.
View More
Mine/wholesalers/agents face unplanned downtime, poor part compatibility, and high maintenance costs on CAT E320C/SBS120/SBS140. Generic actuators leak, fail fast, and delay projects, eroding profits. RITO 204-2683-DM is OEM-grade, direct-fit, and built for harsh mining/construction. It cuts downtime, lowers costs, and boosts resale value.
View MoreLeave A Message
Scan to wechat :
