Komatsu Excavator Boom

Komatsu Excavator Boom parts list
Fits Model	Description	Details	Price	Product Details
See Details	PC360-11	Boom	2A7-70-K1331	From $11,550.00	View Info
See Details	PC170-10, PC170-11	Boom	21K-70-00310	From $11,450.00	View Info
See Details	PC138-11	Boom	22B-70-00532	From $9,850.00	View Info

New OEM replacement booms for Komatsu excavators, covering mid-size and large-frame machines across the PC138, PC170, and PC360 series. Each boom is sourced directly as OEM-spec hardware to ensure proper fit, geometry, and structural integrity for demanding dig cycle applications.

Fits Models At A Glance

PC138 Series: PC138-11
PC170 Series: PC170-10, PC170-11
PC360 Series: PC360-11

Key Notes

Condition: New OEM — not aftermarket or remanufactured
Application: Main boom arm assembly for standard digging configurations
Compatibility: Matched by machine model and serial tier; confirm your generation before ordering
Weight Class: Ranges from mid-size (PC138) to large-frame (PC360) excavators

Why Choose Broken Tractor

✅ OEM parts sourced for exact Komatsu fitment
✅ Multiple PC series covered under one supplier
✅ Fast shipping from our Ohio and Louisiana locations

Frequently Asked Questions

Which Komatsu excavator booms does Broken Tractor carry?

Broken Tractor carries new OEM booms for the Komatsu PC138-11, PC170-10, PC170-11 and PC360-11 excavators. The PC138-11 boom is part number 22B-70-00532, the PC170-10 and PC170-11 share part number 21K-70-00310, and the PC360-11 boom is part number 2A7-70-K1331. Each one is a main boom assembly built to OEM spec for proper fit and geometry.

Are Komatsu excavator booms from Broken Tractor new OEM or aftermarket?

Every Komatsu excavator boom we carry is new OEM, not aftermarket or remanufactured. They are OEM-spec hardware meant to match the original fit, geometry and structural integrity of the factory boom. That matters on a part that takes the full load of every dig cycle.

Does Broken Tractor carry Komatsu long boom, offset boom or knuckle boom excavator parts?

The Komatsu booms we carry are main boom assemblies for standard digging configurations, not long reach, offset or knuckle boom setups. If your machine runs a specialty boom, confirm the exact part number before you order, because a standard boom will not match that geometry. Our parts team can help check what fits your excavator.

How do I match a Komatsu excavator boom to my machine by serial number?

Komatsu booms are matched by machine model and serial tier, so confirm your excavator's model and generation before you order. For example, the PC170-10 and PC170-11 use the same boom, part number 21K-70-00310, while the PC138-11 and PC360-11 each have their own. Compare the part number on your current boom or call (800) 909-7060 with your serial number to confirm fitment.

What size Komatsu excavators do these replacement booms fit?

Our Komatsu booms cover mid-size through large-frame excavators, from the PC138-11 up to the PC360-11. The PC170-10 and PC170-11 fall in between. Because each boom is built for a specific model's weight class and geometry, order by your exact model and part number rather than by size alone.