KANGDA 3Q94 / BH3Q70R8 – High-Pressure Diesel Injection Pump For 380Q Engines

The KANGDA 3Q94 (Order No. 3Q94) with pump model BH3Q70R8 is a precision-engineered inline diesel injection pump specifically calibrated for Changchai 380Q series industrial engines. Rated at 11.5 kW with a governed speed of 1500 rpm, this unit delivers reliable fuel metering for stationary power units, agricultural machinery, and light commercial equipment. Designed to meet Euro II emission-compatible standards, the 3Q94/BH3Q70R8 ensures consistent start-up performance, stable idle control, and reduced smoke output under varying load cycles – a direct replacement solution for workshop overhauls and preventive maintenance programs.

The KANGDA 3Q94 injection pump operates with a plunger diameter of 9.5 mm and a cam lift of 7.5 mm, delivering a maximum injection pressure of 65 MPa – sufficient for atomizing diesel fuel efficiently within the 380Q's swirl combustion chamber. The BH3Q70R8 pump features a hydraulic governor with torque spring, enabling droop control within ±3% across the 600–1500 rpm range. Static injection timing is factory-preset at 22° BTDC (adjustable within ±2° for field fine-tuning). The pump body uses high-grade cast iron housing with hardened camshaft journals and precision-ground plunger barrels to withstand continuous operation at 11.5 kW output. Delivery valve holders are equipped with retraction grooves to eliminate secondary injection, while the fuel inlet pressure ranges from 0.05 to 0.15 MPa. All sealing rings are Viton®-grade for biodiesel blend compatibility up to B20.

This pump is exclusively mapped for the Changchai 380Q – a 3-cylinder, 4-stroke, water-cooled diesel engine with a bore/stroke of 80×90 mm and total displacement of 1.36 L. Common in small tractors (15–25 HP), mini excavators, generator sets (8–12 kVA), and rice transplanters, the BH3Q70R8 governor calibration supports both constant-speed (generator) and variable-speed (vehicle) operations. Replacement compatibility extends to Changchai 385Q and 390Q variants with minor timing adjustments, though the 3Q94 is the direct OEM-specified number for 380Q production lines. For workshops serving agricultural aftermarket clients, this pump directly substitutes Bosch VE-style rotary units where mounting flange dimensions (SAE 3-hole pattern) match. Its fuel delivery rate at 1500 rpm is 42 mm³/stroke at full rack, ensuring sufficient torque backup for sudden load pick-up in concrete mixers and air compressors.

While the 3Q94/BH3Q70R8 is a mechanical inline pump, its role in conventional fuel systems remains critical for older fleets and off-highway equipment where electronic common rail retrofits are cost-prohibitive. For repair shops, stocking this pump reduces downtime for agricultural clients by offering a bolt-on exchange unit with factory-calibrated fuel maps – eliminating the need for bench-testing individual components. The BH3Q70R8 design allows interchangeable plunger sets (available as service kits), enabling in-house rebuilding at 60% of the cost of a new pump. For distributors, the 3Q94 serialization ensures traceability to OEM production batches, simplifying warranty claims. Additionally, the pump's mechanical governor provides inherent fail-safe operation – unlike electronic units, it continues to regulate fuel delivery during voltage dips or sensor failures, making it the preferred choice for remote mining sites and marine auxiliary engines that demand high repairability and low electronics dependency.

Q1: Can the KANGDA 3Q94 replace the original pump on a 380Q engine from a different brand?
A: Yes – it is a direct OEM cross-reference. Verify the 1:10 tapered shaft and 86×86 mm stud spacing. For Bosch P-series flanges, an adapter plate may be needed.

Q2: What is the recommended service interval for this BH3Q70R8 pump?
A: 2,500 hours for heavy tillage (80–100% load); 4,000 hours for generator sets (constant 75% load), provided fuel meets ISO 4406 18/16/13 cleanliness.

Q3: How do I purge air after installation if the engine runs unevenly?
A: Loosen injector-side high-pressure nuts, crank for 15 seconds, then retighten. Use the hand primer to push 0.2 MPa pressure until the governor dashpot fills completely.

Q4: Can I upgrade to larger plungers for more power on the same 380Q engine?
A: 10.0 mm plungers can boost output to 13.5 kW, but this requires reprofiled cams and upgraded piston cooling – not advised without internal engine reinforcements.

Q5: What are shipping lead times for exchange vs. new pumps?
A: Exchange units (core return): 2–3 business days from EU/US warehouses. New assemblies: 7–10 days (includes 12-point EPS 708 test bench validation).

Q6: Is this pump compatible with biodiesel above B20?
A: Viton® seals support B20. For B30+, order the B100-ready variant (3Q94-BIO) with PTFE-coated springs – specify at checkout.