Front-circuit pressure weak or hunting on your ZAX470 or E330D? A worn 340812 front cylinder block and valve plate is leaking internally, robbing the boom and travel circuits of flow. RITO supplies this matched front barrel-and-plate pair precisely lapped to K5V200 OEM tolerances.
Item NO.:
340812Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock340812 Cylinder Block with Valve Plate (Front) for Kawasaki K5V200 piston pumps on ZAX400, ZAX470, SK400 and E330D excavators. As the drive-side section, the 340812 barrel handles the primary hydraulic circuit. Matched lapping of barrel face to valve plate ensures zero cold-start leakage and sustained volumetric efficiency throughout service life.
| Part Number | 340812 |
|---|---|
| Part Name | Cylinder Block with Valve Plate (Front) |
| Compatible Brand | TONG MYUNG (Kawasaki K5V200 Pump) |
| Applicable Models | ZAX400, ZAX470, SK400, E330D Excavator |
| Application | Front (drive) section rotating group of K5V200 tandem piston pump |
| Material | High-strength 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-circuit hydraulic flow and pressure as the drive-side pump section |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Front barrel handles the highest system pressure peaks as the drive-side section, built with thicker bore walls to resist distortion at K5V200 rated pressure.
Barrel valve face and valve plate lapped to Ra 0.1 as a set, ensuring a perfect seal from installation day one without bedding-in leakage.
Input spline bore machined to OEM class for zero backlash engagement with the pump shaft, protecting the barrel from fretting at the spline interface.
Direct replacement for existing 340812 front barrels across ZAX400, ZAX470, SK400 and E330D without pump housing modification.
FAQ
Q: How do I distinguish a 340812 front barrel failure from other pump faults?
A: Perform a split-flow pressure test: if front-pump outlet pressure is low while rear-pump reads normal, the 340812 barrel or its valve plate is the likely cause. Also check case-drain flow - front section case drain above OEM limit confirms barrel wear.
Q: Can I run the pump with only a new 340812 barrel and the old valve plate?
A: Only if the valve plate sealing face measures within OEM flatness specification on a surface plate. Any scoring, heat discoloration or surface steps require valve plate replacement alongside the barrel to avoid immediate re-scoring.
Q: What is the difference between 340812 and 340811?
A: 340812 is the front (drive-side) barrel and 340811 is the rear (driven-side) barrel of the K5V200 tandem pump. They differ in port orientation and are not interchangeable.
Q: How to confirm 340812 is the correct part?
A: Check the pump model is K5V200 and the existing part number is 340812. Provide the pump serial number to our team for cross-reference if uncertain.
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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