PISTON SEAL 4-PC INCH

DESCRIPTION

This Caterpillar-specific four piece piston seal profile is a robust design for heavy duty hydraulic applications, and is an excellent choice for sealing Caterpillar and other mobile hydraulic applications that experience shock loads. This profile is a four piece assembly made up of a rubber energizer, PTFE cap and two back-up rings. The cap material is 15% Glass – 5% Moly filled PTFE. 

In application, fluid pressure forces the rubber energizer to apply increased load against the PTFE cap and back-up rings. This results in increased sealing force against the bore and allows the back-up rings to close off the extrusion gap between the piston and the bore. Once activated by pressure, the back-up rings protect the seal from extruding and keep internal contamination away from the PTFE cap. 

This seal is the same as our CPS profile, but available in Caterpillar-specific sizes. 

SEAL INFORMATION

Material Type (Primary Seal): 15% GLASS/5% MOS2-FILLED PTFE 

Material Type (Energizer): 70A NITRILE 

Material Type (Support Rings): NYLON 

Durometer (Shore D): 67 

Temperature Range (F): -40 TO 250 

Extrusion Gap at Various Pressures (in):

• 2,400 PSI: 0.040
• 3,750 PSI: 0.030
• 6,000 PSI: 0.024
• 7,500 PSI: 0.020

Max Speed (ft/sec): 4.5 

Mating Surface Roughness - Ra (µin) - DYNAMIC: 4<>16 

Mating Surface Roughness - Ra (µin) - STATIC: 63 MAX 

Part Number Definition (Inch): CTC-(CAT PART NUMBER)