Rear-pump pressure collapsing on your ZAX400 or SK400? A worn 340811 rear cylinder block and valve plate set allows internal bypass to grow until the rear circuit can no longer lift or crowd at rated force. RITO supplies this matched barrel-and-valve-plate pair to fully restore rear-pump displacement.
Item NO.:
340811Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock340811 Cylinder Block with Valve Plate (Rear) for Kawasaki K5V200 piston pumps on ZAX400, ZAX470, SK400 and E330D excavators. The matched pair is lapped together during manufacture so the sealing faces conform perfectly from the first hour of operation, eliminating break-in leakage that degrades pump efficiency.
| Part Number | 340811 |
|---|---|
| Part Name | Cylinder Block with Valve Plate (Rear) |
| Compatible Brand | TONG MYUNG (Kawasaki K5V200 Pump) |
| Applicable Models | ZAX400, ZAX470, SK400, E330D Excavator |
| Application | Rear 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 rear-circuit hydraulic flow and pressure in the K5V200 tandem pump |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Barrel face and valve plate sealing surface are lapped as a matched pair, achieving Ra 0.1 finish for zero cold-start leakage.
Geometry matches the rear section of the K5V200 tandem pump, maintaining correct port timing and preventing cross-port leakage between front and rear circuits.
Phosphor-bronze composite valve plate provides excellent conformability against the steel barrel face, maintaining seal under high-pressure pulsation.
Single part number 340811 covers ZAX400, ZAX470, SK400 and E330D, reducing spare parts inventory complexity.
FAQ
Q: What are the signs of a failing 340811 rear cylinder block?
A: Rear-circuit actuators (boom, arm or bucket depending on circuit layout) slow or lose force, rear pump case-drain flow exceeds spec, oil temperature rises faster than normal, and rear-pump outlet pressure reads below front-pump on a split-flow gauge test.
Q: Why should I replace the cylinder block and valve plate together?
A: The sealing efficiency between barrel face and valve plate degrades together. Fitting a new barrel against an old valve plate creates mismatched surface profiles that generate immediate high leakage and score the new barrel face within hours.
Q: Is 340811 interchangeable with 340812 front block?
A: No. 340811 is the rear section barrel and 340812 is the front section barrel of the K5V200 tandem pump. They differ in port orientation and spline engagement. Always confirm front or rear position before ordering.
Q: How to verify 340811 is the correct part for my pump?
A: Confirm the pump model tag reads K5V200 and the existing rear barrel part number matches 340811. Contact us with the pump serial number for exact 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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