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C5291050 XCMG GR2605 motor grader oil pump
Part Number: C5291050 (5291050)
Cross Reference: 4939588, 4304670
Type: External Gear Pump
Material: Body—Cast Iron; Gears—Hardened Steel
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Product Details:
C5291050 XCMG GR2605 motor grader oil pump
C5291050 (5291050) is a genuine Cummins gear-type oil pump, the “heart” of the lubrication system for ISB/QSB6.7, ISDE engines. It uses high-strength cast iron body & hardened gears to draw oil from the pan, pressurize, and feed crankshaft, bearings, pistons. Works with C5311002 dipstick & C3937736 filter for complete lubrication.
Technical Parameters
Part Number: C5291050 (5291050)
Cross Reference: 4939588, 4304670
Type: External Gear Pump
Material: Body—Cast Iron; Gears—Hardened Steel
Drive: Crankshaft Gear
Pressure: Idle ≥1.5bar, Rated ≥4.0~6.0bar
Flow: ~60~80L/min
Mount: 4-Bolt, Dowel Pin Located
Seal: Composite Gasket
Weight: Approx. 3.0kg
Standards: Cummins OEM, ISO 9001, TS16949
Application
Applicable Engines:
- Cummins: ISB6.7, QSB6.7, ISDE6.7, ISBE5.9, 6BT5.9
- DCEC: ISDE, ISBE, QSB Series
Equipment:
- Trucks: Dongfeng Kinland, Foton Auman, Dodge Ram 2500-5500 (2003-2018)
- Construction: Komatsu PC200-8, Hitachi ZX240, Kobelco SK210, Excavators, Loaders
- Gensets: 120–200kW QSB6.7 Units
- Industrial: Compressors, Marine, Oilfield
Installation Location:
- Front of engine block, above oil pan, driven by crankshaft gear.
Common Faults & Troubleshooting
1. Low Oil Pressure
- Causes: Worn gears, excessive clearance, clogged pickup, stuck relief valve, thin/low oil
- Symptoms: Idle pressure <1.0bar, warning light on, engine noise
- Solution:Clean pickup; Service relief valve; Use correct oil
2. Pump Noise (Rattling/Ticking)
- Causes: Gear wear, misalignment, debris, bearing damage
- Symptoms: Metal ticking with RPM
- Solution: Replace C5291050; Check drive gears; Flush system
3. Oil Leakage
- Causes: Bad gasket, loose bolts, cracked body
- Symptoms: Seepage around pump
- Solution: Replace gasket; Torque bolts; Replace damaged pump
4. High Oil Pressure
- Causes: Stuck relief valve, blocked galleries, thick oil
- Symptoms: Overpressure (>7bar), filter rupture, seal leaks
- Solution: Service relief valve; Flush galleries; Use correct viscosity oil
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1 C3900677 hex head bolt
2 C5291050 oil pump
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