SH240-3 main circuit pressure fluctuating or pump case drain getting hot? A worn KBJ2789 K3V112 pump allows internal bypass to accumulate, slowly robbing the SH240-3 of the flow reserve it needs for simultaneous boom and swing operation. RITO's heavy-duty pump assembly restores the full K3V112 displacement that keeps all your SH240-3 circuits responding together.
Item NO.:
KBJ2789-OTOrder(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time:
In StockKBJ2789 Hydraulic Main Pump Assembly for Case SH240-3 excavator (K3V112). The KBJ2789 is the model-specific part number for the K3V112 main pump fitted to the SH240-3 work cycle. Precision cylinder block, matched valve plate and factory-calibrated regulator restore both volumetric efficiency and the pressure-flow characteristic required for stable simultaneous multi-function operation.

| Part Number | KBJ2789 |
|---|---|
| Part Name | Hydraulic Main Pump Assembly |
| Compatible Brand | Case (CASE) |
| Applicable Models | SH240-3 Excavator (K3V112 Pump) |
| Application | K3V112 main variable axial piston pump for Case SH240-3 hydraulic system |
| Material | Precision alloy steel rotating group and pump housing |
| Product Color | Industrial finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Provides primary hydraulic flow and pressure for all Case SH240-3 work functions |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |

K3V112 rotating group selected and tested to SH240-3 simultaneous multi-function duty, ensuring adequate flow reserve when boom, arm and swing are operated together.

Cylinder block and valve plate supplied as a matched pair, eliminating the seating-in period that temporarily reduces efficiency when non-matched components are assembled.

Regulator spring and spool pre-set to Case SH240-3 power curve, protecting the engine from overload during heavy simultaneous operation without requiring field adjustment.

SAE flange port layout and engine mounting bolt circle confirmed for SH240-3 direct installation without adaptor modifications.

FAQ
Q: How does a worn KBJ2789 pump affect SH240-3 simultaneous function operation?
A: As pump bypass increases, combined flow from front and rear sections falls. The system first shows degraded simultaneous operation (e.g., swing slows when boom is raised together) before individual actuator speed drops.
Q: Should I replace both pump sections or just the worn one?
A: The KBJ2789 assembly replaces the complete tandem pump. When one section is sufficiently worn to cause symptoms, the other section is typically at similar wear life. Replacing both sections at once is more cost-effective than two separate repairs.
Q: What oil change and filter protocol should I follow when fitting KBJ2789?
A: Flush the hydraulic tank, replace return-line filter, replace all high-pressure filter elements and drain the old pump case-drain hose before connecting. This removes debris from the failed pump that would otherwise contaminate the new unit.
Q: How to confirm KBJ2789 is correct for my SH240-3?
A: Match the existing pump model plate reading KBJ2789 and confirm the excavator is SH240-3. Provide machine 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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