Caterpillar

Select Equipment

Select equipment to view parts that fit your equipment.
No suggested results. Try again.
Register
Caterpillar

Add Equipment

To find the parts that fit.To find the parts that fit.
Search for part number or name

Select Equipment

HomeHydraulicsHydraulic Cylinders & ComponentsHydraulic Cylinder Seals5J-4991: 165mm Bore Diameter 2-Piece Seal
HomeHydraulicsHydraulic Cylinders & ComponentsHydraulic Cylinder Seals5J-4991: 165mm Bore Diameter 2-Piece Seal
5J-4991: 165mm Bore Diameter 2-Piece Seal

Cat® Plastic Molded Rubber 2-Piece Seal for Cylinders

Brand: Cat

Product Images
5J-4991: 165mm Bore Diameter 2-Piece Seal
5J-4991: 165mm Bore Diameter 2-Piece Seal
5J-4991: 165mm Bore Diameter 2-Piece Seal
5J-4991: 165mm Bore Diameter 2-Piece Seal
5J-4991: 165mm Bore Diameter 2-Piece Seal

Cat® Plastic Molded Rubber 2-Piece Seal for Cylinders

Brand: Cat

Add your equipment to see if this part fits or if there are repair options available.
Will It Fit?Add your equipment to see if this part fits or if there are repair options available.
Add Equipment
Will it fit or looking for a repair?Add your equipment to see if this part fits or if there are repair options available.
Check Price
Check Price
Login to view your customer price
Warranty Information
Return Policy
Description
Description

A two-piece seal, consisting of a piston ring and an expander, which prevents oil transfer between the rod end of the cylinder and the cap end. The piston seal is usually made of Teflon, with nylon available for pressure greater than 3000 psi (20,670 kpa). The various shaped expanders are nitrile.

Warning:This product can expose you to chemicals including 1,3-Butadiene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

A two-piece seal, consisting of a piston ring and an expander, which prevents oil transfer between the rod end of the cylinder and the cap end. The piston seal is usually made of Teflon, with nylon available for pressure greater than 3000 psi (20,670 kpa). The various shaped expanders are nitrile.

Warning:This product can expose you to chemicals including 1,3-Butadiene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Specifications
Specifications
Units of MeasureUSMetric
Groove Width - A (+/- 0.002inch) (in): 0.38
Bore Diameter (in): 6.50
Seal Shape: Type 1
Groove Diameter - B (+/- 0.003inch) (in): 5.59
Units of MeasureUSMetric
Groove Width - A (+/- 0.002inch) (in): 0.38
Bore Diameter (in): 6.50
Seal Shape: Type 1
View More
Compatible Models
Compatible Models
Wheel Tractor
633E II633C633D639D637631D631E631C631G637G637D637E
Hydraulic Control
163153
Track Loader
963977K977L
Off Highway Truck
793F
Wheel Dozer
834B824C
Landfill Compactor
836
Winch
59N59L58L57H57565556H
Wheel Loader
980988966C966R
Track-Type Tractor
D6H XLD7RD6H XRD6T LGPD6G SRD7GD7HD6D SRD6R IIID6G2 LGPD5D8D8TD8RD6GCD8ND6H IID6R STDD7R LGPD8 GCD8R IID9ND6G2 XLD5R LGPD6N LGPD6R XLD6R IID6T XWD5H XLD6T XLD7R SERIESD8GCD5R2D6F SRD5BD5R XLD6E SRD7R IID6DD7G2D6N XLD6RD6TD6ND6R LGPD7R XRD6ED6GD6H
Ripper
765498977963951955
Wheel Scraper
633637E637G666666B631G631E633E633B633D
Water Fording Tractor
D7R II
Bulldozer
65A5S7SU6A6S7A7S7U6SU7S LGP8A824S8U8249U9SU834U834S8SU824C
Technology
AUTOGUIDNC
View More
Wheel Tractor
633E II633C633D639D637631D631E631C631G637G637D637E
Warranty Information
Return Policy
Parts Diagrams
No EquipmentEnter equipment serial number or choose equipment from previously added list to see parts diagrams.
Select Equipment
Frequently bought together
5J-49915J-4991
3J-97033J-9703
2K-44722K-4472
View All Parts
Frequently bought together
5J-4991
3J-9703
2K-4472
2K-4473
312-4247
421-4025
DiagramDescriptionSpecificationsCompatible Models
Parts diagram for 5J-4991
View Detailed Parts Diagrams
Add Your Equipment
Specifications for part number 5J-4991

Units of Measure

USMetric
Groove Width - A (+/- 0.002inch) (in): 0.38
Groove Diameter - B (+/- 0.0762 mm) (mm): 142.11
Bore Diameter (in): 6.50
Bore Diameter (mm): 165.10
Seal Shape: Type 1
Groove Diameter - B (+/- 0.003inch) (in): 5.59
Groove Width - A (+/- 0.0508 mm) (mm): 9.63
View More
Compatible Models for part number 5J-4991

WHEEL TRACTOR

633E II 633C 633D 639D 637 631D 631E 631C 631G 637G 637D 637E

HYDRAULIC CONTROL

163 153

TRACK LOADER

963 977K 977L

OFF HIGHWAY TRUCK

793F

WHEEL DOZER

834B 824C

LANDFILL COMPACTOR

836

WINCH

59N 59L 58L 57H 57 56 55 56H

WHEEL LOADER

980 988 966C 966R

TRACK-TYPE TRACTOR

D6H XL D7R D6H XR D6T LGP D6G SR D7G D7H D6D SR D6R III D6G2 LGP D5 D8 D8T D8R D6GC D8N D6H II D6R STD D7R LGP D8 GC D8R II D9N D6G2 XL D5R LGP D6N LGP D6R XL D6R II D6T XW D5H XL D6T XL D7R SERIES D8GC D5R2 D6F SR D5B D5R XL D6E SR D7R II D6D D7G2 D6N XL D6R D6T D6N D6R LGP D7R XR D6E D6G D6H

RIPPER

7 6 5 4 9 8 977 963 951 955

WHEEL SCRAPER

633 637E 637G 666 666B 631G 631E 633E 633B 633D

WATER FORDING TRACTOR

D7R II

BULLDOZER

6 5A 5S 7SU 6A 6S 7A 7S 7U 6SU 7S LGP 8A 824S 8U 824 9U 9SU 834U 834S 8SU 824C

TECHNOLOGY

AUTOGUIDNC

View More
KeyKey
Factory Fit

This part is designed to fit your Cat equipment based on the manufacturer’s specifications.

Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts.

Remanufactured

Non-Returnable

Kit

Replaced

Remanufactured

Non-Returnable

Kit

Replaced

Find Parts
Support
My Account
Cat Social
United States EnglishالعربيةবাংলাБългарски简体中文繁體中文ČeštinaDanskNederlandsSuomiFrançaisDeutschΕλληνικάעבריתहिन्दीBahasa IndonesiaItaliano日本語ಕನ್ನಡ한국어NorskPolskiPortuguês do BrasilRomânăРусскийEspañol (Latino)Svenskaதமிழ்తెలుగుไทยTürkçeУкраїнськаTiếng Việt
About Cat
Site Map
Cookie Settings
Do Not Sell or Share My Personal Information
Legal Terms
My Marketing Preferences
Privacy

Caterpillar© 2025 All Rights Reserved

Find Parts
    Support
      My Account
        Cat Social
          Language
            CAT Sites
              About Cat
              Site Map
              Cookie Settings
              Do Not Sell or Share My Personal Information
              Legal Terms
              My Marketing Preferences
              Privacy

              Caterpillar© 2025 All Rights Reserved

              Chat with an expert