JD 450H-650K Dozer Track Adjuster

Track adjusters, recoil springs, adjuster rods, yokes, seal kits, and spring covers for John Deere 450H through 650K crawler dozers, covering complete tension assemblies and individual components across H, J, and K series undercarriages.

Fits Models At A Glance

• 450 Series: 450H, 450J, 450K, 450 P-Tier
• 550 Series: 550H, 550J, 550K, 550 P-Tier
• 650 Series: 650H, 650J, 650K, 650 P-Tier
• Earlier Coverage: Select seal kits and springs also fit 450G, 550G, 650G and older B/C/D/E models

Key Notes

• Application: Maintains proper track tension and cushions undercarriage shock loads.
• Roller Configuration: Parts vary by 5, 6, and 7 bottom roller undercarriages.
• Serial Breaks: Adjuster rods and yokes differ before and after S/N 159987.
• Components: Complete adjusters, rods, springs, yokes, covers, shims, seal kits.

Why Choose Broken Tractor

• ✅ Fitment verified by roller count and serial
• ✅ Fast shipping from two US locations
• ✅ New and used dozer parts available

Frequently Asked Questions

How do I know which track adjuster rod fits my John Deere 650J dozer?

The correct rod depends on your serial number and undercarriage. Rods differ before and after serial number 159987, so a 650J built before S/N 159986 uses parts like AT211001 or AT225225, while a 650J Long Track after S/N 159987 uses T257066 or T257067. Match your machine's serial number to the part fitment, or confirm with the parts team before ordering.

What is the difference between 5, 6, and 7 bottom roller track adjuster parts on a JD 450H-650K dozer?

Adjuster assemblies, rods, and covers vary by the number of bottom rollers on your undercarriage. For example, a 450H with 5 bottom rollers uses assembly PV323 and rod AT207649, while 6 roller machines use assemblies like T169180-A and 7 roller machines use PV326 or PV330. Count your bottom rollers first so you order the matching adjuster and covers.

How do I fix loose or sagging track tension on a John Deere 550K dozer?

Loose track tension usually means a worn track adjuster rod, recoil spring, or a leaking seal that will not hold grease. Broken Tractor carries complete track adjuster assemblies, adjuster rods, recoil springs, and seal kit SKU 905003 for 450H through 650K dozers. Confirm your serial number and roller count so the replacement adjuster or rod matches your undercarriage.

What is included in a complete track adjuster assembly for a JD 450H dozer?

A complete track adjuster assembly is a full tension unit rather than a single component. For a 450H with a 5 roller undercarriage, Broken Tractor offers assembly PV323, and 6 roller 450H/450J/550H/550J machines use assembly T169180-A. We also carry the individual rods, yokes, springs, seal kits, covers, and shims if you only need to replace one part.

Does the track adjuster seal kit fit older John Deere 450 and 550 dozers?

Yes, seal kit SKU 905003 covers a wide range including 450, 450A through 450K, 550 through 550K, and 650G through 650K models. It fits many earlier B, C, D, E, and G series machines as well. Verify your model against the listed fitment or check your part number to confirm the correct kit.