C3955030 XCMG GR2605 motor grader dowel pin

Technical Parameters

• Part Number: C3955030 (3955030)
• Type: Solid cylindrical dowel pin
• Material: 40Cr/45# alloy steel, through-hardened
• Hardness: HRC 55–60
• Dimensions: Diameter: 10mm Length: 16–18mm Tolerance: m6/p6 (interference fit)
• Surface: Black oxide/phosphate coating for corrosion resistance
• Quantity: 1–2 pieces per engine (trigger wheel/crankshaft flange)
• Cross Reference: 3904483, 3945269

Application Scenarios

Compatible Engines

• B Series: B5.9, G5.9
• ISBe Series: ISBe4.5, ISBe5.9
• ISDe Series: ISDe4.5, ISDe6.7
• QSB Series: QSB3.9, QSB4.5, QSB5.9, QSB6.7
• ISF Series: ISF3.8

Applicable Equipment

• Commercial Vehicles: Dongfeng Kinland, Tianjin, Dalishen, Duolika
• Construction Machinery: Loaders, excavators, rollers, forklifts
• Generator Sets: 50–160kW diesel generator sets

Installation Locations

• Rear Crankshaft: Crankshaft trigger wheel / flywheel flange positioning
• Precision mating surfaces: Cylinder block-head, gear housing-block, bearing caps
• Core Function: Restricts radial movement, ensures positional accuracy, withstands shear loads

Common Faults & Troubleshooting

1. Pin Wear, Deformation, Fracture

• Causes: Insufficient interference fit, shock loads, material fatigue, handling damage
• Symptoms: Loose trigger wheel, incorrect timing, engine vibration, poor acceleration, abnormal noise
• Solution: Replace with C3955030 dowel pin, inspect and repair worn or enlarged locating holes

2. Damaged/Enlarged Locating Holes

• Causes: Loose pin, repeated disassembly, foreign debris, improper pressing
• Symptoms: Excessive clearance, lost positioning, component wobble, incorrect timing
• Solution: Repair holes (by sleeving/reaming), install genuine C3955030, ensure proper interference fit

3. Pin Loss or Dislodgement

• Causes: Incomplete pressing, insufficient interference, severe vibration, failure to reinstall
• Symptoms: Trigger wheel misalignment, no-start, rough idle, fault codes (P0335/P0322)
• Solution: Reinstall C3955030 with full seating, verify retention and anti-loosening