Caterpillar 8J3747 Seal Kit

Caterpillar 8J3747 Seal Kit is a Hercules catalog product available from WQC Parts for hydraulic cylinder, seal kit, pump, motor, valve, and heavy-equipment repair applications.

This listing uses Hercules part number CTC-8J3747. Catalog description: PA-TFE-4-1/2.

Product Details

• Hercules part number: CTC-8J3747
• Product type: Hydraulic cylinder seal kit
• Reference brand/application: Caterpillar
• Approximate weight: 0.102 lb
• Catalog data source: 2026 US Seal Catalog

Catalog Application Data

• Catalog section: T-Seals
• Style / kit type: 8 A.M. To 8:00 P.M. Eastern Time
• Material / grade reference: PTFE CAP NYLON BACK-UP RUBBER ENERGIZER
• Temperature range: -40° TO +220° F
• Pressure range: 0 TO 6,000 PSI .500 ±.002 3.840 ±.003 4.500 .630 ±.002 4.230 ±.003 5.000 .630 ±.002 4.730 ±.003 5.500 .630 ±.002 5.090 ±.003 6.000 .630 ±.002 5.340 ±.003 6.250 .630 ±.002 5.590 ±.003 6.500 .630 ±.002 6.090 ±.003 7.000 .630 ±.002 6.340 ±.003 7.250 .630 ±.002 6.590 ±.003 7.500 .630 ±.002 6.840 ±.003
• Catalog page reference: 260

Use this product when your parts book, service manual, cylinder repair list, pump/motor breakdown, or existing component calls for CTC-8J3747. It is intended to help restore sealing performance, reduce leakage, and support reliable equipment repair when correctly matched to the application.

Fitment Verification

Before ordering, confirm the CTC-8J3747 reference against your OEM reference number, machine model, cylinder location, bore and rod size, pump/motor series, and serial-number range. Manufacturer names and part numbers are used for identification and fitment reference only. If you are unsure, compare the old parts, measurements, and parts-book callout before installation.