SEAL KIT - HYDRAULIC CYLINDER (JLG JL991/20030)

JL991/20030: A damaged seal kit can allow hydraulic fluid to bypass the piston, reducing cylinder force and causing erratic movement. During inspection, a seal kit may show visible wear or hardening that compromises its ability to contain pressure. Seal kit condition directly affects the cylinder's ability to hold load and respond to control inputs. Keeping a seal kit in sound condition helps prevent fluid leaks that can create slippery surfaces and increase fire risk. This aftermarket replacement part references JLG catalog number JL991/20030. The kit includes multiple sealing elements designed to separate fluid chambers within a cylinder. Verify the serial number or application, then call (562) 693-7748.

Part number variants: JL991/20030, jl991/20030