HHF-1300/1600 Piston Rubber Parts Classification & Technical Guide

1

11－3161-0524－0102－00

Rubber ：5 1/2

Nitrile Rubber (NBR 70 Shore A) with Reinforced Polyester Fabric Insert

1. Chemical degradation from hydraulic fluid additives; 2. Compression set from prolonged pressure application; 3. Abrasion from small particles in fluid.

1. Use fluids compliant with ISO 6743-4 for NBR compatibility; 2. Replace after 800 operating hours (or if compression set exceeds 25%); 3. Filter fluid to remove particles >0.2mm.

2

11－3161-0524－0202－00

Rubber ：6

Nitrile Rubber (NBR 70 Shore A) with Reinforced Polyester Fabric Insert

1. Thermal aging from extreme temperature fluctuations; 2. Tear damage from piston misalignment; 3. Swelling from incompatible fluid contaminants.

1. Operate within -20°C to 120°C (NBR’s optimal range); 2. Align piston to prevent uneven rubber contact; 3. Test fluid compatibility before system use.

3

11－3161-0524－0302－00

Rubber ：6 1/4

Nitrile Rubber (NBR 70 Shore A) with Reinforced Polyester Fabric Insert

1. Wear from repetitive piston reciprocation; 2. Brittle cracking from prolonged storage in dry environments; 3. Damage from improper installation tools.

1. Apply thin high-pressure lubricant before installation; 2. Store in sealed, humidity-controlled packaging (40-60% RH); 3. Use plastic tools to avoid tearing during fitting.

4

11－3161-0524－0402－00

Rubber 6 1/2

Nitrile Rubber (NBR 70 Shore A) with Reinforced Polyester Fabric Insert

1. Erosion from high-velocity fluid flow; 2. Degradation from ozone exposure (industrial environments); 3. Over-compression from incorrect piston-cylinder clearance.

1. Control fluid velocity below 5 m/s; 2. Protect from ozone-generating equipment (e.g., welding machines); 3. Maintain piston-cylinder clearance per API 618.

5

11－3161-0524－0502－00

Rubber ：6 3/4

Nitrile Rubber (NBR 70 Shore A) with Reinforced Polyester Fabric Insert

1. Corrosion from acidic/alkaline media; 2. Fatigue from pressure cycling (high-frequency systems); 3. Adhesive failure between rubber and fabric insert.

1. Add corrosion inhibitors for harsh media; 2. Shorten replacement intervals to 600 hours for high-cycle use; 3. Inspect for delamination during routine maintenance.

6

11－3161-0524－0602－00

Rubber ：7

Nitrile Rubber (NBR 70 Shore A) with Reinforced Polyester Fabric Insert

1. Damage from foreign debris entering the cylinder; 2. Swelling from water contamination in hydraulic fluid; 3. Thermal degradation from system overheating.

1. Install intake filters to block debris; 2. Monitor fluid water content (keep below 0.1%); 3. Maintain system cooling to prevent overheating.

How to match piston rubber size to HHF-1300/1600 pistons?

Match the rubber size (5 1/2” to 7”) exactly to the piston size it serves—refer to the piston’s part number or system manual. Genuine rubber parts are precision-molded to fit corresponding piston grooves, ensuring tight sealing and compliance with ISO 3601-1 dimensional standards.

Can I use a different rubber material for corrosive media?

Yes. For highly corrosive media (e.g., strong acids/alkalis), replace NBR with Viton (FKM) piston rubbers (available for all sizes). Viton offers superior chemical resistance, though it requires operating within -15°C to 200°C and is compatible with fewer lubricants—consult technical support for fluid pairing.

What’s the signs that piston rubber needs replacement?

Replace if you notice pressure loss, fluid leaks, rubber swelling/cracking, or compression set exceeding 25% (measured per ISO 815). Routine replacement every 800-1,000 operating hours (or shorter for harsh conditions) prevents sudden system failure.