Rear-pump pressure dropping on your R370-7 or R420LC-7? A worn 720786 rear cylinder block allows the K3V180DT rear section to bypass, reducing combined-function flow capacity. RITO supplies this Tong Myung precision rear barrel to restore full K3V180DT rear-section displacement on large Hyundai excavators.
Item NO.:
720786Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock720786 Pump Cylinder Block (Rear) for Kawasaki K3V180DT piston pumps on Hyundai R370-7, R375-7, R420LC-7 and R455LC-7 excavators. Cross-reference: 720785 (front barrel). The rear barrel is the driven-side section of the K3V180DT tandem pump. Precision-bored cylinders and lapped valve face restore volumetric efficiency in the rear circuit governing secondary hydraulic functions.
| Part Number | 720786 |
|---|---|
| Part Name | Pump Cylinder Block (Rear / Driven Side) |
| Compatible Brand | TONG MYUNG (Kawasaki K3V180DT Pump) |
| Applicable Models | R370-7, R375-7, R420LC-7, R455LC-7 Excavator |
| Application | Rear (driven-side) rotating group of K3V180DT high-displacement tandem piston pump |
| Material | High-strength alloy steel |
| Product Color | Silver machined metal finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Generates rear-section hydraulic flow for R370-7 to R455LC-7 secondary circuits |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Port timing and spline geometry matched to the K3V180DT rear section, preventing port mismatch and cross-port leakage between front and rear circuits.
Rear barrel bore wall thickness optimised for the driven-side pressure profile, maintaining structural integrity across the full K3V180DT operating pressure range.
Valve-plate mating surface lapped to Ra 0.2, ensuring the sealing clearance required for correct volumetric efficiency at K3V180DT rated displacement and pressure.
720786 rear barrel complements the 720785 front barrel for full rotating group restoration in one service event on R370-7 to R455LC-7.
FAQ
Q: How to identify K3V180DT rear barrel (720786) failure versus front barrel failure?
A: Perform a split-flow pressure test. Low rear-section outlet pressure with normal front-section pressure, combined with high rear case-drain flow, confirms 720786 rear barrel or valve plate wear rather than front-section failure.
Q: Should I replace the valve plate together with the 720786 rear barrel?
A: Yes. If the valve plate sealing face shows scoring, heat marks or uneven wear, replace it together with the barrel. Fitting a new barrel against a worn valve plate re-scores the new part within hours.
Q: Can I run the K3V180DT pump with only the 720786 rear barrel replaced?
A: Yes, front and rear barrels can be replaced independently. If front-section case drain is within specification, the 720785 front barrel can remain in service.
Q: How to confirm 720786 fits my R370-7 K3V180DT pump?
A: Verify pump model is K3V180DT and existing rear barrel part number is 720786. Confirm machine model is R370-7, R375-7, R420LC-7 or R455LC-7. Provide pump serial number 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
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