Case 580B, Early 580C Split-Piston Seal Kits

Hydraulic cylinder seal kits and tools for Case 580B and early 580C (split-piston style) backhoe loaders, covering complete seal rebuild packages, boom, dipper, bucket, stabilizer, swing, loader lift, loader leveler, and loader tilt cylinder circuits.

Fits Models At A Glance

• 480C Series: 480C
• 580B Series: 580B
• 580C Series: 580C (early split-piston style)
• 580L / 580 Super L Series: 580L, 580 Super L
• 580M / 580 Super M Series: 580M, 580 Super M
• 580N / 580 Super N Series: 580N, 580 Super N
• 590 Series: 590 Super L, 590 Super M, 590 Super N

Key Notes

• Application: Hydraulic cylinder seal kits and tools for Case 580B and early 580C split-piston style backhoe loader cylinders
• Coverage: Includes complete hydraulic cylinder seal rebuild packages in 3.5-inch and 4-inch bore configurations, boom cylinder seal kits, dipper, swing, and stabilizer cylinder seal kits, bucket and stabilizer cylinder seal kits, loader lift cylinder seal kits, loader leveler cylinder seal kits, loader bucket tilt cylinder seal kits, hydraulic line supports, and cylinder tools
• Function: Restores hydraulic cylinder sealing and performance across all major cylinder positions on Case 580B and early 580C split-piston style backhoe loader platforms
• Fitment Note: Two rebuild package bore sizes available — 3.5-inch and 4-inch — verify bore size before ordering; early split-piston style 580C only

Why Choose Broken Tractor

• ✅ Complete seal rebuild packages available in 3.5-inch and 4-inch bore sizes
• ✅ Seal kits available for every major cylinder position on 580B and early 580C
• ✅ Cylinder spanner wrenches and gland installation tools available

Frequently Asked Questions

How do I know if my Case 580C has early split-piston cylinders?

Our early 580C seal kits are made for split-piston cylinders stamped G3, so check the stamping on your cylinders before ordering. Broken Tractor offers a full Seal Kit Package for Case 580C Early Style (SKU CS-SK-1B) built for these cylinders. These kits fit early split-piston style 580C machines only, so if you are unsure which style you have, match the part number on your cylinder or call (800) 909-7060.

What bore size seal kit do I need for a Case 580B?

Broken Tractor carries complete hydraulic cylinder seal kits for the Case 580B in two bore sizes: 3.5 inch (SKU CS-580B-SK-A) and 4 inch (SKU CS-580B-SK-B). Measure or confirm the bore size of your cylinders before ordering, because the two packages are not interchangeable. If you only need to reseal one cylinder, individual kits for each cylinder position are also available.

Which seal kit fits the boom, dipper and swing cylinders on a Case 580B or 580C?

For the boom cylinder, we carry the Boom Cylinder Seal Kit for Case 580B and 580C split-piston cylinders (SKU G105528). The dipper, swing and stabilizer cylinders are covered by the Case Backhoe Cylinder Repair Kit (SKU 1543271C1), and the Bucket/Stabilizer Cylinder Kit (SKU G105527) fits 480C, 580B and 580C backhoes. Some of these kits fit only certain 580C versions, so match the part number on your cylinder to confirm fitment.

What seal kit fits the loader lift cylinder on a Case 580B?

For the Case 580B loader lift cylinder with a G33443 or G33444 gland, we carry seal kit SKU 1543378C1. Broken Tractor also offers the Lift and Leveling Seal Kit (SKU 1543263C1) for 580B and 580C split-piston G3 stamped cylinders, plus a 2-piece split piston Loader Bucket Tilt Cylinder Seal Kit (SKU G109484). Check the gland number stamped on your cylinder so you get the correct kit.

What tools do I need to reseal a Case backhoe hydraulic cylinder?

A spanner wrench and a gland seal installation tool make a cylinder reseal much easier, and Broken Tractor carries both. The Case Hydraulic Spanner Wrench (SKU CAS-1456A) is made for Case backhoe cylinder repair. The Hydraulic Gland Seal Installation Tool Kit (SKU CAS-1457) helps you seat new gland seals without damaging them.