Jetuplusllc Boom & Bucket Cylinder Seal Kit for Kubota LA463–LA555 — 45 mm Bore OEM-Fit

This Jetuplusllc Boom & Bucket Cylinder Seal Kit (replacement for Kubota 7J273-63400) is a complete hydraulic seal set engineered to restore tight cylinder performance on compatible Kubota front loaders.

When a loader cylinder leaks or loses pressure, seals are the most common wear item. This seal kit includes the precision components sized for a 45 mm bore and 30 mm outer diameter, designed specifically to fit Kubota front loader models LA463, LA513, LA514, LA524FL, LA525FL, and LA555. All parts arrive new and pre-measured to match the OEM fit so you can service boom and bucket cylinders without custom machining or guessing sizes.

How will this seal kit fix a leaking loader cylinder?

Replacing worn or damaged seals restores internal pressure containment and prevents hydraulic fluid loss, returning smooth lift and bucket control. The kit supplies the rings and lips that make the dynamic and static seals between piston, rod, and cylinder bore.

• Includes multiple seal types sized to OEM-equivalent dimensions (45 mm bore, 30 mm OD).
• New elastomers and backup rings reduce blow-by and external leaks.
• Direct replacement for Kubota 7J273-63400 for correct fitment.

Which Kubota models and cylinder locations does this set fit?

This kit is intended for front loader boom and bucket cylinders on the listed Kubota models. It covers both rod and piston sealing surfaces where the OEM part number is specified.

• Compatible models: LA463, LA513, LA514, LA524FL, LA525FL, LA555.
• Designed as a replacement for OEM part 7J273-63400 (part number 1901-1254 reference).
• Fits typical boom and bucket hydraulic cylinder assemblies on those loaders.

What should I check before installing these seals?

Inspect cylinder surfaces, rod finish, and bore roundness before fitting new seals. Contaminated or scored surfaces will cut seals quickly, so cleaning and light refinishing may be necessary for a durable repair.

• Verify bore diameter (45 mm) and outer diameter clearance (30 mm) match your cylinder.
• Check rod for nicks, pitting, or corrosion; polish or replace if damaged.
• Clean the cylinder thoroughly and remove old seal remnants and debris.

What tools and steps are recommended for a reliable rebuild?

Simple shop tools plus proper seal drivers make installation faster and reduce damage risks. Follow a methodical sequence: disassemble, clean, inspect, lubricate seals, and reassemble torquing fasteners to manufacturer specs.

• Use seal picks, soft drivers, and assembly lube compatible with hydraulic fluids.
• Replace worn rods or pistons rather than forcing seals onto damaged parts.
• Pressure-test the cylinder at low pressure first to confirm leak-free sealing.

Who this is for: This Jetuplusllc hydraulic seal kit is aimed at owners, fleet maintainers, and mechanics who service Kubota LA463, LA513, LA514, LA524FL, LA525FL, and LA555 front loaders. It’s suitable for DIY repairs and shop rebuilds where restoring hydraulic integrity and preventing fluid leaks are the priority. Choose this kit when you need OEM-compatible dimensions (45 mm bore, 30 mm OD) and a straightforward replacement for Kubota part 7J273-63400.