369‑8420 Radiator Return Check Valve — Hydraulic Cooling System Protection
The 369‑8420 Return Check Valve is a dedicated safety component installed in the hydraulic radiator return pipeline of Caterpillar excavators. It controls one‑way flow of cooled hydraulic oil back to the tank, strictly preventing reverse backflow into the radiator core. This design stabilizes cooling‑system circulation, avoids heat accumulation, and protects the radiator from pressure‑shock damage.
1. Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Part Number | 369‑8420 (3698420) |
| Application Position | Hydraulic Radiator Cooling Line / Return Circuit |
| Main Material | High‑Strength Alloy Aluminum |
| Valve Type | Unidirectional Non‑Return Check Valve |
| Internal Structure | Corrosion‑Resistant Coating + Heavy‑Duty Mechanical Spring |
2. Machine Compatibility
This cooling‑system check valve is suitable for updated‑generation 20‑ton CAT excavators:
CAT 320 Series: 320D, 320D L, 320D GC, 320D2, 320D2 L, 320D2 GC, 320D2 FM, 320D3
CAT 323 Series: 323D L, 323D2, 323D2 L, 323D3
3. Key Features & Advantages
Stable Thermal Control: Ensures continuous one‑way circulation of cooled hydraulic oil, effectively preventing excavator overheating under heavy‑load operation.
Radiator Core Protection: Blocks reverse pressure surges, avoiding radiator fin deformation, oil leakage and structural failure.
Lightweight High‑Strength Alloy Body: Optimized strength‑to‑weight ratio with excellent resistance to hydraulic‑fluid corrosion and aging.
OEM‑Precision Fitment: Manufactured to standard CAT dimensions for leak‑free connection with original radiator hoses.
Product: Radiator Return Check Valve
Condition: Aftermarket New Replacement
Cross Part Number: 3698420
MOQ: 5 PCS
Warranty Period: 6 Months
For bulk wholesale, technical consultation and cooling‑system component solutions:
Xuzhou Sinoswift Import & Export Co., Ltd.
Contact: +86 13701956981
Email: [email protected]
