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C3936365 XCMG GR2605 motor grader pressure relief valve
Part Number: C3936365 (3936365)
Type: Oil Pressure Relief Valve / Bypass Valve
Opening Pressure: ~65 PSI (~4.5 bar, OEM set)
Operating Pressure: ≤7 bar (opens at overpressure)
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Product Details:
C3936365 XCMG GR2605 motor grader pressure relief valve
C3936365 (3936365) is a genuine Cummins Oil Cooler/Main Gallery Pressure Relief Valve, a critical safety component in the lubrication system for B/ISB/QSB/C/ISC series engines. Integrating a plunger, spring, and O-ring seal, it automatically opens to bypass oil to the sump when pressure exceeds the set point, protecting the main gallery/oil cooler from overpressure damage while ensuring stable oil pressure across RPM ranges. Constructed from high-strength alloy and oil-resistant rubber, it features high-temperature resistance, anti-seizing properties, and long service life, serving as a key “safety valve” for reliable lubrication system operation.
Technical Parameters
Part Number: C3936365 (3936365)
Type: Oil Pressure Relief Valve / Bypass Valve
Opening Pressure: ~65 PSI (~4.5 bar, OEM set)
Operating Pressure: ≤7 bar (opens at overpressure)
Operating Temperature: -40℃~150℃
Dimensions: Length ~26.7 mm (1.05″), Body Diameter ~15.7 mm (0.62″)
Weight: ~0.05 kg
Materials: Body – High-Strength Alloy Steel; Seal – Nitrile Rubber (NBR)
Cross References: 3902338, 3927622
Standard: Cummins OEM, ISO 9001, TS16949
Location: Oil Filter Head / Oil Cooler Head Chamber (Main Gallery Bypass)
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 Full Series.
Equipment:
- Commercial Vehicles: Dongfeng Tianlong, Tianjin, Foton Aumark, FAW J6, Dodge Ram 2500/3500 (1989-2024 5.9L/6.7L)
- 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
Common Faults & Troubleshooting
1. High Oil Pressure (Cold/Idle Alarm)
- Causes: Stuck relief valve plunger, fatigued spring, failed O-ring seal causing pressure loss
- Symptoms: Cold start >7 bar, idle >5 bar, filter rupture, seal leaks, gallery shock
- Solution: Replace genuine C3936365 relief valve; clean oil cooler and galleries, clear bypass lines.
2. Low Oil Pressure (Hot/Acceleration Alarm)
- Causes: Permanently open valve (broken spring/worn plunger), seal failure causing constant bypass
- Symptoms: Hot idle <1.5 bar, acceleration <2.5 bar, oil warning light, engine noise, bearing wear
- Solution: Immediately replace C3936365 relief valve; inspect oil pump, filter, galleries, and oil cooler if needed.
3. Valve Leakage/Drips
- Causes: Aged/hardened O-ring, improper installation (twisted/side-loaded), worn valve face
- Symptoms: Seepage/drips around valve base, oil stains on ground, dropping oil level
- Solution: Replace C3936365 relief valve (includes new O-ring); clean mounting surface, ensure no distortion during assembly.
4. Pressure Fluctuation/Instability
- Causes: Plunger seizing, uneven spring tension, clogged oil galleries
- Symptoms: Severe pressure swings with RPM, unstable idle, erratic acceleration pressure
- Solution: Replace C3936365 relief valve; thoroughly flush lubrication system, change oil and filter.
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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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