235-0352 Hydraulic Cylinder Seal Kit 2350352 for Cat Backhoe Loader 416C 416D 420D 424D 426C 428C 430D 436C Repair
235-0352 Hydraulic Cylinder Seal Kit for Caterpillar 416C/416D/420D/436C Backhoe Loaders – OEM-Certified Repair Solution
Product Overview
The 235-0352 Seal Kit is a Caterpillar-authorized repair solution designed for the boom, arm, and bucket hydraulic cylinders of Cat 416C, 416D, 420D, 424D, 426C, 428C, 430D, and 436C backhoe loaders. This kit restores factory sealing performance to eliminate leaks, ensure precise hydraulic control, and extend equipment lifespan in excavation, trenching, and material handling operations.
235-0352 Hydraulic Cylinder Seal Kit Technical Specifications
| Parameter | Specification |
|---|---|
| Compatible Models | Cat 416C, 416D, 420D, 424D, 426C, 428C, 430D, 436C |
| Application | Hydraulic Cylinder Piston Seals, Rod Seals, Dust Wipers |
| Pressure Range | 0–25 MPa (3,626 PSI) – Matches Cat hydraulic system standards |
| Temperature Tolerance | -30°C to +110°C (-22°F to +230°F) |
| Primary Seal Material | Hydrogenated Nitrile (HNBR) – Resists oil degradation and abrasive wear |
| Secondary Seals | Fluorocarbon (FKM) Wiper Seals, PTFE Wear Rings, NBR O-Rings |
| Certifications | ISO 6194 (Rotary Shaft Seals), Caterpillar 5P-1960 Compliance |
235-0352 Hydraulic Cylinder Seal Kit Components & Functions
| Component | Function |
|---|---|
| 1. Piston Seal (HNBR) | Dual-acting U-cup maintains hydraulic pressure during dynamic digging loads. |
| 2. Rod Seal (FKM) | Step-lip design prevents oil leakage along the cylinder rod. |
| 3. Dust Wiper (NBR) | Removes abrasive debris during rod retraction (ISO 10100 compliant). |
| 4. Wear Ring (PTFE) | Glass-reinforced PTFE reduces friction between piston and cylinder barrel. |
| 5. Buffer Seal (FKM) | Absorbs pressure spikes during abrupt load changes. |
| 6. O-Rings (HNBR) | High-pressure static seals for hydraulic port connections (SAE J1926). |
| 7. Backup Ring (PU) | Reinforces rod seal against extrusion under side loads. |
Key Features & Benefits
✅ OEM Interchangeability: Direct replacement for Cat® part numbers 122-7450 and 223-8905.
✅ High-Cycle Durability: HNBR seals withstand over 400,000 cycles in trenching and heavy lifting.
✅ Contamination Defense: Multi-layer wiper design exceeds ISO 4406 cleanliness standards.
✅ Extended Service Life: PTFE wear rings reduce cylinder wear by 30% compared to non-OEM kits.
✅ Global Compliance: Adheres to EU Machinery Directive 2006/42/EC and REACH Regulation 1907/2006.
