Left Hand Tie Rod Jam Nut for Case 580K, 590 Turbo, 590SM & More – 81878551

Fits Models At A Glance:

• Case 580 Series: 580K — After Serial Number JJG0020000 with 4-Bolt Gland, 580 Super K
• Case 590 Series: 590 Turbo, 590 Super L, 590 Super L Series II, 590SM, 590SM Series II

Key Notes:

• Part Numbers: 81878551, 81878556
• Interchanges With: 126145A1
• Weight: 0.05 lbs (0.02 kg)
• Thread: M24 x 1.5, Left Hand
• Grade/Finish: Grade 8.8, zinc plated
• Axle: Fits Carraro 2618 Four-Wheel Drive Steering Axle (MFD steering cylinder)
• Type: Tie rod jam nut, left-hand thread
• Serial Number Note: 580K fitment applies After Serial Number JJG0020000 with 4-Bolt Gland only — verify your machine before ordering
• Application: Secures the tie rod end on the steering linkage, locking the tie rod adjustment in place to maintain proper toe alignment

Common Use Case or Symptoms:
Use during a tie rod end replacement or toe alignment adjustment — a stripped or seized jam nut can't hold the tie rod adjustment, allowing toe-in/toe-out to drift out of spec.

Why Choose Broken Tractor:
✅ Correct M24 x 1.5 Left-Hand Thread — matched to the MFD steering cylinder tie rod on the Carraro 2618 axle
✅ Serial-Number-Verified Fitment — 580K scoped to the 4-bolt gland/after-serial configuration so you order the right nut
✅ Fast Shipping from a U.S.-Based Team — in-stock and ready to ship from our U.S. warehouses

Why Choose Broken Tractor

• Built to Match OEM Fit and Function - Our replacement parts are manufactured to meet original equipment specifications so your machine keeps working like it should
• Real People Who Know Case Equipment - Our parts experts help you confirm fitment before you buy, saving you time and hassle
• Fast Shipping from a U.S.-Based Team - We process orders quickly to get your backhoe back on the job with minimal downtime