Milton CAT 390D L - Manual (Page 9)

9
Front Linkage
Built to perform the toughest tasks
Front Linkage
Cat ® Excavator booms and sticks are built for performance
and long service life.
• Castings and forgings are used at high stress areas
such as the boom nose, boom foot, boom cylinder
and stick foot.
• All booms and sticks are stress-relieved for optimal
life and durability while minimizing weight for
improved performance.
• All booms and sticks are ultrasonic inspected
to ensure reliability.
Bucket Linkage
Two bucket linkages are available for the 390D L. Both are
available with or without a lifting eye.
Boom Construction
390D L booms feature a large cross section to improve
strength, reduce weight and maximize payload. Baffl e plates
reinforce the boom interior for higher rigidity.
Stick Construction
Sticks are made of high-tensile strength steel in a box-section
design, making them strong and light. All sticks are reinforced
with a thick baffl e plate for added rigidity. The connection
between stick and boom is made of forged steel, and a thick
steel plate is used at the bucket connecting location for increased
strength and rigidity at load-bearing points. An additional
wear plate is added to the bottom plate to protect against
damage. There are two reach sticks, three general purpose
sticks and two mass sticks available to meet your needs.
Linkage Pins
All front linkage pins have thick chrome plating, giving them
high wear resistance. Each pin diameter is made to distribute
the shear and bending loads associated with the stick and
to help ensure long pin, boom and stick life.