Milton CAT 320E LRR - Manual (Page 9)

Front Linkage
Made for high stress and long service life
Booms and Sticks
The 320E LRR is offered with a range of booms and sticks (see list below). Each is built with internal baffl e
plates for added durability, and each undergoes ultrasound inspection to ensure weld quality and reliability.
Large box-section structures with thick, multi-plate fabrications, castings, and forgings are used in high-stress
areas such as the boom nose, boom foot, boom cylinder, and stick foot to improve durability.
The boom nose retention method is a durable captured flag design. Boom durability is improved with
a number of plate thickness changes. Also, the front linkage pins’ inner bearing surfaces are welded,
and a self-lubricated bearing is used to extend service intervals and increase uptime.
Selections
There are two basic boom options: HD and ES.
• HD = Heavy Duty – This type of boom is designed to balance reach, digging force, and bucket capacity.
It covers the vast majority of applications such as digging, loading, trenching, and working with
hydraulic tools.
• ES = Extreme Service – This type of boom is best used for demolition or extreme applications where
stress loads on the boom are increased. It should be used for demanding, harsh applications like
100% rock and extensive hammer use.
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