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 look-up 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.

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.

With a tape measure and a few minutes with your current boom, you can find all the measurements you need to search for a replacement. » Click video to play/pause animation.

❱❱ 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 with images to help identify what exactly to measure and, if you’re a paper and pencil person, you can grab our printable boom measuring guide.

Stick Connection Pin Hole Diameter [View Image]

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 [View Image]

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.

Boom Cylinder Connection Pin Hole Diameter [View Image]

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 [View Image]

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 [View Image]

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 [View Image]

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

Boom Cylinder Connection Pin Hole Height [View Image]

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 [View Image]

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 [View Image]

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 [View Image]

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 [View Image]

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.

 

With those simple measurements in hand (or written down on our measuring guide), you should have all you need to start your used excavator boom search.

As always, our knowledgeable Part Specialists are here to help connect you with the perfect replacement part to get your back up and running quickly. And when you call they can search not just our deep inventory of used and reconditioned excavator booms, but our national connected parts network. Just drop them a message.

 

 Excavator Boom Diagram Gallery

Excavator stick connection pin hole
Measure the diameter of one of the pin holes in a pin ear that is used to connect the stick to the boom.
Excavator stick cylinder connection pin hole.
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.
Excavator boom cylinder connection pin hole.
Measure the diameter of one of the pin holes that is used to connect the boom cylinder to the side of the boom.
Excavator boom base pin hole.
Measure the diameter of one of the pin holes that is used to connect the base of the boom to the excavator.
Excavator stick cylinder to stick connection 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.
Excavator boom cylinder to boom base 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.
Excavator boom cylinder connection 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.
Excavator boom 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.
Excavator boom stick connection pin ears width.
Measure the inside width of the pin ears on the far side of the boom where the stick will connect to the boom.
Excavator boom stick cylinder connection pin ears 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.
Excavator 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.

How To Series

This article is part of the H&R Construction Equipment Parts How To series, designed to give readers and viewers a brief glimpse of the work of our Recon and Rebuild team or to provide basic maintenance and help tips. Whether you’re rolling up your sleeves and about to get your hands greasy or you’re just looking for a better understanding of a part, please practice proper safety protocols and understand this is only a basic guide. Consult a trained professional before performing any unfamiliar tasks.