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C3947287 XCMG GR2605 motor grader pressure regulator plunger
Part Number: C3947287 (3947287)
Alternate Name: Oil Pressure Regulator Valve Plunger / Spool
Material: High Hardness Carbon Steel (Carburized / Quenched)
Surface: Precision Ground & Polished, Ra≤0.4μm
Dimensions: OD ~φ16mm, Length ~42mm
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Product Details:
C3947287 XCMG GR2605 motor grader pressure regulator plunger
C3947287 (3947287) is a genuine Cummins Oil Pressure Regulator Plunger, a precision core component in the lubrication system for B/ISB/QSB engines. Works with C3925009 Spring and C3929457 O-Ring to balance oil pressure and spring force, precisely controlling bypass flow to maintain stable oil pressure under all operating conditions.
Technical Parameters
Part Number: C3947287 (3947287)
Alternate Name: Oil Pressure Regulator Valve Plunger / Spool
Material: High Hardness Carbon Steel (Carburized / Quenched)
Surface: Precision Ground & Polished, Ra≤0.4μm
Dimensions: OD ~φ16mm, Length ~42mm
Clearance: 0.015~0.03mm with Bore
Matched Parts: C3925009 Spring, C3929457 O-Ring
Standard: Cummins OEM, ISO 9001, TS16949
Application
Applicable Engines: Cummins 4B3.9, 6BT5.9, ISB, QSB3.9/4.5/5.9/6.7 Series.
Equipment:
- Commercial Vehicles: Dongfeng Tianlong, Tianjin, Foton Aumark, JAC, FAW J6
- Construction Machinery: Komatsu PC200-8, Hitachi ZX200, Kobelco SK210, LiuGong CLG922, XCMG XE215
- Generator Sets: 50–150kW Cummins Diesel Gensets
- Industrial Equipment: Air Compressors, Pumps, Forklifts, Marine Main Engines
Installation Location:
- Inside regulator bore in Oil Filter Head / Oil Cooler Head
- Function: Controls main gallery pressure; bypasses excess oil to sump when overpressure, maintaining 3.5–5.5bar standard pressure.
Common Faults & Troubleshooting
1. Low Oil Pressure (Hot / Acceleration Alarm)
- Causes: Worn, scored, excessive clearance, stuck open
- Symptoms: Idle <1.5bar, Accel <2.5bar, warning light, noise, bearing wear
- Solution: Replace C3947287 Plunger; inspect bore, spring, O-ring; flush galleries
2. High Oil Pressure (Cold / Filter Rupture)
- Causes: Stuck closed, rusted, debris, damaged guide ring
- Symptoms: Cold >7bar, filter burst, seal leaks, gallery shock
- Solution: Replace C3947287 Plunger; clean, replace spring/O-ring, clear bypass
3. Pressure Fluctuation / Instability
- Causes: Uneven wear, surface damage, misaligned spring, clogged galleries
- Symptoms: Erratic pressure, unstable idle, pressure drop on acceleration
- Solution: Replace C3947287 Plunger; align, clean chamber, replace spring
4. Oil Leakage
- Causes: Failed O-ring, scored plunger, worn bore, improper assembly
- Symptoms: Seepage at filter head, low pressure, oil stains
- Solution: Replace C3947287 + C3929457 O-Ring; repair bore, proper assembly
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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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