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C3999967 XCMG GR2605 motor grader hydraulic pump connection flange
- Part Number: C3999967 (3999967)
- Brand: DCEC Cummins, suitable for XCMG GR2605 original specifications
- Type: Hydraulic Pump Adapter Flange
- Material: High-strength alloy cast iron, aged treatment, tensile strength ≥250MPa
- Fit Engine: Cummins QSB6.7 series diesel engine
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C3999967 XCMG GR2605 motor grader hydraulic pump connection flange
Introduction
C3999967 (3999967) is a special adapter flange for connecting Cummins engines to hydraulic pumps, widely used in construction machinery. It ensures precise alignment, support and power transmission between engine crankshaft and hydraulic pump. Manufactured from high-strength cast iron/steel with precision machining and dynamic balancing, it features high rigidity, accurate positioning and excellent shock resistance, suitable for high-pressure hydraulic systems and heavy-duty working conditions.
Technical Parameters
- Part Number: C3999967 (3999967)
- Brand: DCEC Cummins, suitable for XCMG GR2605 original specifications
- Type: Hydraulic Pump Adapter Flange
- Material: High-strength alloy cast iron, aged treatment, tensile strength ≥250MPa
- Fit Engine: Cummins QSB6.7 series diesel engine
- Fit Machine: XCMG Grader GR2605
- Structure: Integrated adapter flange with positioning spigot, bolt holes and sealing groove
- Connection: Engine side bolted, pump side centering connection
- Bolt Grade: Grade 12.9, M10/M12
- Standard Torque: 100–120N·m
- Concentricity: ≤0.05mm
- Surface Treatment: Phosphating / blackening, oil-resistant and corrosion-resistant
- Operating Temperature: -40℃～120℃
- Weight: Approx. 2.8kg
- Cross Reference: 3965411, 4994581, C3999968
Application
- Engine Fit: Cummins QSB6.7, ISDE, 6BT/6CT series diesel engines
- Equipment: Loaders, graders, excavators (XCMG, SANY, LIUGONG etc.)
- Conditions: Mining, infrastructure, farmland improvement, heavy load, high vibration, continuous operation
- Location: Engine rear (flywheel housing), connecting engine and hydraulic pump for alignment, support and sealing
Common Faults & Troubleshooting
1. Loose Connection / Bolt Breakage
- Causes: Insufficient torque, vibration fatigue, misalignment, low-grade bolts
- Fix: Retorque bolts to 120–150N·m; replace with grade 12.9 bolts; check alignment
2. Flange Wear & Oil Leakage
- Causes: Poor concentricity, seal aging, flange damage, hydraulic shock
- Fix: Replace O-ring/gasket; resurface flange; correct alignment (≤0.05mm)
3. Noise & Excessive Vibration
- Causes: Unbalanced, excessive clearance, misalignment, weak support
- Fix: Check runout; realign; tighten support bolts; replace worn flange
4. Bore / Keyway Wear
- Causes: Overload, poor lubrication, loose fit, shock loading
- Fix: Inspect clearance; replace flange if worn; avoid system overloading
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5 C3999967 Hydraulic Pump Connection Flange
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