arm hydraulic cylinder
construction cylinder

construction cylinder

Bucket Arm Boom cylinder cat 4T7819 hydraulic cylinder Factory Supplier

Bucket Arm Boom cylinder cat 4T7819 hydraulic cylinder Factory Supplier

Model  :621B; 621; 621B; 621R; 623B; 627B; 631D; 633D; 637D; 639D;(WHEEL TRACTOR-SCRAPER)

caterpillar machinery spare parts

  • Item NO.:

  • Payment:

  • Product Origin:

  • Color:

  • Shipping Port:

    Xiamen port
  • Lead Time:

    3 to 5 days
Product Details

Model  :621B; 621; 621B; 621R; 623B; 627B; 631D; 633D; 637D; 639D;(WHEEL TRACTOR-SCRAPER)

caterpillar machinery spare parts

part number  4T7819

rotary hydraulic cylinder

E70 E311B E320C E330B
E70B E312 E320D E330C
E120 E313 E322 E330D
E200B E315A D E324D E330L
E240 E320 E325 E345
E300B E320B E325B E345D
E311 E320BL E325BL E365
E320V2 E320BU E329B E390
E374 E450 E349 E374

bore  50.8 mm

close length  356mm

rod  25.4mm

pin size cap end 0

pin size rod eye 0

stroke  127mm

type  bolted head

JDF roundline welded hydraulic cylinders provide value through proven reliability, efficient performance and the quality that you expect from every JDF cylinder Division product line.

Each JDF hydraulic cylinder incorporates design features that are superior in a 3000 psi roundline welded cylinder.

Every JDF cylinder is individually tested before leaving our plant to assure proper performance and leak-free operation.

All JDF cylinder products carry and 12 month warranty.




Natural Resources


Features and Benefits:

NOK seal kits for positive no-leak sealing

Non-metallic wear rings at both head and piston

Port mounted counterbalance valves for cylinder control

Every cylinder is tested to assure reliability

12 month warranty


Energy production, Development& service

Power generation

Factory automation




1, How does a hydraulic cylinder works ?

Hydraulic cylinders get their power from pressurized hydraulic fluid, which is typically hydraulic oil. The hydraulic cylinder consists of a hydraulic barrel, in which a piston connected to a piston rod moves back and forth. The piston has seal kits.

Also, cylinders has gland, nuts,seal kits.

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