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C3925009 XCMG GR2605 motor grader compression spring
Part Number: C3925009 (3925009)
Type: Oil Pressure Regulator Spring
Material: High-Strength Alloy Spring Steel (Tensile Strength >1500MPa)
Finish: Black Oxide (Corrosion Protection)
Wire Diameter: φ2.2mm
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Product Details:
C3925009 XCMG GR2605 motor grader compression spring
C3925009 (3925009) is a genuine Cummins Oil Pressure Regulator Compression Spring, a critical pressure control component in the lubrication system for B/ISB/QSB/C/L series engines. Cold-coiled from high-strength alloy spring steel with precise heat treatment and presetting, it features high fatigue strength, constant tension, high temperature resistance, and creep resistance, accurately controlling the regulator valve opening pressure to ensure stable oil pressure during cold start, full-load, and varying RPM conditions, preventing over-pressurization or insufficient lubrication.
Technical Parameters
Part Number: C3925009 (3925009)
Type: Oil Pressure Regulator Spring
Material: High-Strength Alloy Spring Steel (Tensile Strength >1500MPa)
Finish: Black Oxide (Corrosion Protection)
Wire Diameter: φ2.2mm
Outer Diameter: φ12mm
Free Length: 38.5mm
Coils: 10.5 (8.5 active)
Preload: 45~50N (Working Pressure)
Max Load: 80N
Rate: 0.5mm/N
Operating Temp: -40℃~150℃
Weight: Approx. 0.017kg
Cross Reference: 3906928, 4897455
Standard: Cummins OEM, ISO 9001, TS16949
Application
Applicable Engines: Cummins 4B3.9, 6BT5.9, 6B5.9, ISB4.5, ISB6.7, QSB4.5, QSB5.9, QSB6.7, 6C8.3, ISC/QSC8.3, L9/QSL9 Full Series.
Equipment:
- Commercial Vehicles: Dongfeng Tianlong, Tianjin, Dalishen, Foton Aumark, JAC, FAW J6, Dodge Ram 2500/3500
- Construction Machinery: Komatsu PC200-8, Hitachi ZX200, Kobelco SK210, LiuGong CLG922, XCMG XE215
- Generator Sets: 50–220kW Cummins Diesel Gensets
- Industrial Equipment: Air Compressors, Pumps, Marine Engines, Oilfield Machinery, Forklifts
Installation Locations:
- Oil Filter Head / Oil Cooler Head (Regulator Valve Chamber)
- Function: Core of oil pressure regulation assembly, controlling main gallery safety pressure
- Operation: Oil pressure overcomes spring tension to open regulator, bypassing oil to sump, maintaining 3.5–5.5bar standard pressure
Common Faults & Troubleshooting
1. High Oil Pressure (Cold/Idle Alarm)
- Causes: Excessive spring tension, stuck spring, seized plunger
- Symptoms: Cold start >7bar, idle >5bar, filter rupture, seal leaks, gallery shock
- Solution: Replace with genuine C3925009 spring; clean regulator, check plunger, clear galleries
2. Low Oil Pressure (Hot/Acceleration Alarm)
- Causes: Spring fatigue, tension loss, breakage, wear, thermal annealing
- Symptoms: Hot idle <1.5bar, acceleration <2.5bar, warning light, noise, bearing wear, scuffing
- Solution: Immediately replace C3925009 spring; inspect pump, filter, galleries, bearing clearance
3. Spring Breakage/Deformation
- Causes: Material fatigue, thermal shock, debris, improper assembly, overpressure
- Symptoms: Erratic pressure, noise, metal debris, stuck valve, abnormal pressure
- Solution: Replace C3925009 + regulator assembly; flush system, replace filter
4. Pressure Fluctuation/Instability
- Causes: Misaligned spring, uneven ends, inconsistent tension, worn plunger, clogged galleries
- Symptoms: Pressure swings with RPM, unstable idle, pressure drop on acceleration
- Solution: Replace C3925009 spring; ensure vertical alignment, clean chamber, replace plunger
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1 3955034 Oil Filter Seat
2 3974127 Filter Seat Gasket
3 C3901445 hexagonal flange bolt
4 C3906619 plug
5 C3925009 compression spring
6 C3929457 O-ring seal
7 C3936365 pressure reducing valve
8 C3946947 plug
9 C3947287 oil pressure regulating valve plunger
10 C3975818 oil cooler core
11 D2830559 oil cooler core sealing gasket
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