Boom Cylinder Rod and Base End Bushing for Cat 426C 430D 436C 446D 450E | 9R-6515

Fits Models At A Glance:

• Caterpillar Backhoe Loaders - Side Shift: 426B, 426C, 430D, 436B, 436C
• Caterpillar Backhoe Loaders - Center Pivot: 446, 446B, 446D
• Caterpillar Backhoe Loaders - E Series: 450E

Serial Number Notes:

• Caterpillar publishes no serial break for this bushing: All nine machines below are covered across their full serial runs as far as Caterpillar's own data shows. Check the three character prefix on your data plate against your parts book if your machine is an early or late build.
• 430D: check the data plate - the 430D is the only D Series machine on this list, and the 416D, 420D and 424D use a different boom cylinder bushing
• 450E: the only E Series machine covered. The 416E through 434E take 326-3362 or 9R-2700 at the boom cylinder instead.
• Watch the near miss on these same machines: 9R-3812 fits 426B, 426C, 430D, 436B, 436C, 446, 446B and 446D - the same list minus the 450E - and shares this 60.3 mm bore. It is 30 mm long against this part's 41 mm, and it belongs at the backhoe bucket cylinder, not the boom cylinder.

Key Notes:

• Part Number: 9R6515 (Caterpillar reference 9R-6515)
• Weight: 0.97 lbs
• Application: Boom cylinder pivot eyes - the sleeve that presses into the rod eye and the base eye of the backhoe boom cylinder
• Location: Backhoe end, inside the boom cylinder. Caterpillar does not publish which end, and this is the only boom cylinder bushing catalogued across these nine machines, so it serves both eyes the same way 9R-0139 does on the 416D family.
• Dimensions: 60.33 mm inside diameter, 73.10 mm outside diameter, 41 mm long
• Style/Type: Straight steel sleeve, no grease hole, no cross holes, no external groove
• Measure Before Ordering: 9R-3812 shares this 60.3 mm bore and fits eight of these same nine machines, but it is 30 mm long and belongs at the backhoe bucket cylinder. Measure the length before ordering.
• Quantity: Sold individually. A cylinder with a bushing at each eye takes two.
• Material: Steel, low alloy
• Condition: Aftermarket replacement part
• Shipping Restrictions: Ships within the lower 48 United States only

Common Use Case or Symptoms:

Use when the boom cylinder clunks at either pin as the boom changes direction, when the pin has worn bright where it rides the bushing, or when the cylinder eye has started to elongate. Both eyes wear at similar rates, so most shops do the pair while the cylinder is out.

Why Choose Broken Tractor?

• ✅ Nine Machines Across Three Families: Side shift 426 and 436, center pivot 446, and the 450E on one number - a rare part that crosses Caterpillar's backhoe families.
• ✅ Not The Bucket Cylinder Bushing: 9R-3812 shares the bore and nearly the whole machine list but is 11 mm shorter and belongs at the bucket cylinder. We name both so the wrong one does not end up in the box.
• ✅ Still Catalogued By Caterpillar: An older number that is still live and orderable, on machines whose parts support is thinning out fast.