C4936423 XCMG GR2605 motor grader gear housing

Introduction

Technical Parameters

• Model: C4936423 (4936423)
• Brand: DCEC Cummins
• Type: Engine rear gear housing
• Material: HT250 gray cast iron (170-241HBS)
• Fit: Cummins ISDE4.5, ISDE6.7, ISBE, QSB6.7
• Structure: One-piece precision casting, integrated bearing seats
• Precision: Bearing bores φ72H7, φ115H8, position ≤0.05mm
• Lubrication: Built-in pressure oil passages
• Seal: Precision machined mating surface with gasket
• Mount: Locating pins, multi-bolt (M8-M10)
• Cross: 3971015, 5309274, 5311269 (interchangeable)
• Weight: Approx. 8.5kg
• Surface: Anti-rust coating

Application Scenarios

• Vehicles: Dongfeng Kinland, Tianjin, Dali Shen (ISDE/ISBE)
• Machinery: 18–26 ton loaders, graders, bulldozers (QSB6.7)
• Conditions: Heavy-duty, mining, high-altitude, frequent starts
• Location: Engine rear, between cylinder block and flywheel housing
• Functions: Timing gear protection, bearing support, lubrication, sealing

Common Faults & Troubleshooting

1. Cracking & Oil Leakage

• Cause: Casting flaws, vibration, stress, impact
• Symptom: Oil seepage, pressure drop
• Fix: Replace C4936423, new gasket, torque to spec.

2. Bearing Wear & Noise

• Cause: Poor lubrication, contamination, bearing failure
• Symptom: Rear noise, gear play, vibration
• Fix: Check oil pressure; replace bearings; repair/replace housing.

3. Misalignment & Timing Error

• Cause: Damaged pins, improper assembly, loose bolts
• Symptom: Hard start, low power, bad emissions
• Fix: Replace pins; align timing marks; torque bolts correctly.

4. Oil Passage Blockage

• Cause: Sludge, debris, assembly contamination
• Symptom: Gear grinding, overheating, rapid wear
• Fix: Clean passages; change oil/filter; ensure proper lubrication.