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What Measurements Do I Need to Search for a Used Excavator Boom?

Jun 24 , 2022

The boom on a well-built excavator is a tough, wear-resistant part, but even the best part can fail under certain conditions. Overloading, rough conditions, and use beyond what the boom was built for can lead to failure. And, of course, there’s the cataclysmic event that leads to immediate failure.


Whether you’ve inspected your boom and found it needs to be replaced due to impending failure or the boom met with a sudden event, you’re likely here because you’re searching for a replacement excavator boom. The good news is that since booms are designed to perform for a long time, there’s often an available used excavator boom that will work for your machine. To help you search and get you and your excavator back up and running fast, we’ve put together this short guide.


Matching the Boom to Your Excavator

As with most parts on your excavator, the first place to start your used excavator boom search is through a simple lookup using the machine’s make, model, and serial number. Once you grab those details from your machine, you can simply match them to a machine that has been through teardown at an excavator salvage yard.

    

Excavator Boom

 Excavator Boom

However, to open up even more opportunities and increased inventory, you can also search through the measurements of the boom since there can be crossover between related excavator models. As you can probably guess, you’ll just need to get some quick and simple excavator boom measurements, and then you'll connect those with a company who provides online excavator booms for sale.


What Measurements Do I Need to Search for a Used Excavator Boom?

To get the dimensions you’ll need to search for a salvaged excavator boom, you’ll only need access to the current boom and a measuring tape (depending on the machine a long tape might be necessary). For a few measurements, a second set of hands can be helpful. Below, you’ll find descriptions to help identify what exactly to measure.


Stick Connection Pin Hole Diameter

Measure the diameter of one of the pin holes in a pin ear that is used to connect the stick to the boom. (The diameter of a circle is always the maximum distance of any two points at the circle’s edge).


Stick Cylinder Connection Pin Hole Diameter

Measure the diameter of one of the pin holes in a pin ear on the top of the boom that is used to connect the stick cylinder to the boom.

Long Reach Arm and Boom

Long Reach Arm and Boom


Boom Cylinder Connection Pin Hole Diameter

Measure the diameter of one of the pin holes that is used to connect the boom cylinder to the side of the boom.


Boom Base Connection Pin Hole Diameter

Measure the diameter of one of the pin holes that is used to connect the base of the boom to the excavator.


Stick Connection Pin Hole to Stick Cylinder Connection Pin Hole Distance

Measure the distance from the center of one of the stick connection pin holes to the center of one of the stick cylinder connection pin holes.


Boom Cylinder Connection Pin Hole to Boom Base Connection Pin Hole Distance 

Measure the distance from the center of one of the boom cylinder connection pin holes to one of the boom base connection pin holes.


Rippers

 Rippers

Boom Cylinder Connection Pin Hole Height

Measure the distance from the center of one of the boom cylinder connection pin holes to a point that would be directly below it on the ground if the boom were standing on its edge.


Working Length

Determine the full, working length of the boom by measuring (as a straight line) from the center of the pin hole that will connect to the excavator to the center of the pin hole that will connect to the stick.


Stick Connection Pin Ears Inside Width

Measure the inside width of the pin ears on the far side of the boom where the stick will connect to the boom.


Stick Cylinder Connection Pin Ears Inside Width

Measure the inside width of the pin ears on the upper side of the boom where the stick cylinder will connect to the boom.


Boom Base Width

Determine the base width of the boom by measuring across the entire base where the boom connects to the machine, from the left-hand (LH) side to the right-hand (RH) side.


 

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