Every machine has 'em!
Excavators, skid steers, dozers, backhoes, you name it. These two parts go hand in hand, connecting different parts of the machine to one another. When you get some sloppy play between a pin and a bushing, its time to replace them. There isn't much point in replacing one without the other. This is because the bushing is designed to wear out so that it does not ruin the frame of the machine or the hydraulic cylinder or other parts that are attached. When one pin goes, it's probably a good indicator that the other ones could use a checkup as well.
When there is excessive play between a pin and a bushing, it can cause expedited wear to the parts around them. A nice tight fit between pin and bushing is what you're looking for. Generally, bushings have grooves on the inner circle that are filled with grease, so when the bushing moves up or down on the pin, there is ample lubrication so there is no additional wear.
Depending on the manufacturer and model of machine, there will be grease points located near the pins and bushings that will allow you to refill the lubricant on these essential parts. Because of the grooves on the inside of the bushings, grease gets stored inside and continues to lubricate the pin during operation. This does NOT mean that you leave it as is! Regular grease top ups are essential to keeping these partners in parts running as intended.
Some bushings even come with a dust seal, which attach and keep dust from getting in, and grease from getting out. Dust, dirt, or other jobsite grime getting into your grease can be detrimental to your machine, causing your parts to wear out faster. Make sure to clean your machine regularly to avoid contaminating grease or other fluids.
Check out our ConEquip 101 video explaining pins and bushings HERE!
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