Front-circuit pressure hunting or front pump case drain overheating on your PC300-7? A worn 321702 front barrel and valve plate causes progressive efficiency loss in the drive-side HPV140 section. RITO pairs barrel and valve plate to OEM lapping tolerance so front-circuit pressure recovers immediately after fitting.
Item NO.:
321702Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock321702 Cylinder Block with Valve Plate (Front / Right) for Kawasaki HPV140 piston pumps on PC300-7, PC350-7, PC300-8 and PC360-7 excavators. As the drive-side barrel, the 321702 handles the highest instantaneous pressure loads in the tandem pump. The matched valve plate is lapped to the barrel face to achieve sealing integrity from the first stroke.
| Part Number | 321702 |
|---|---|
| Part Name | Cylinder Block with Valve Plate (Front) |
| Compatible Brand | TONG MYUNG (Kawasaki HPV140 Pump) |
| Applicable Models | PC300-7, PC350-7, PC300-8, PC360-7 Excavator |
| Application | Front (drive) section rotating group of HPV140 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 primary hydraulic circuit flow as the drive-side section of the HPV140 tandem pump |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Barrel wall thickness increased on the drive-side design to withstand the highest pressure transients without bore distortion at HPV140 rated pressure.
Barrel-face to valve-plate sealing clearance achieved through matched lapping, eliminating break-in leakage that temporarily reduces front-circuit efficiency after installation.
Spline bore machined to OEM class for zero-backlash pump-shaft engagement, protecting the barrel spline from fretting fatigue under cyclic torque.
Restoring front-section displacement to OEM spec rebalances flow between front and rear circuits, normalising all excavator functions simultaneously.
FAQ
Q: How do I distinguish a 321702 front barrel failure from rear barrel or servo issues?
A: A split-flow pressure test isolates front vs rear: low front-pump outlet pressure with normal rear-pump pressure, combined with high front case-drain flow, confirms 321702 barrel or valve plate wear rather than servo or relief valve issues.
Q: Can I fit a new 321702 barrel with the existing valve plate?
A: Only if the valve plate flatness is within 2 micrometres across the sealing land. Any scoring, heat marking or pitting requires valve plate replacement alongside the barrel to prevent immediate re-scoring of the new barrel face.
Q: What is the difference between 321702 and 321701?
A: 321702 is the front (drive-side, right) section barrel and 321701 is the rear (driven-side, left) section barrel of the HPV140 tandem pump. They are not interchangeable due to different spline and port geometry.
Q: How to confirm 321702 fits my HPV140 pump?
A: Check pump model is HPV140 and existing front barrel part number is 321702. Provide pump serial number 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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