Milton CAT 374D L - Manual (Page 7)

7
Structures
Rugged structures designed for maximum durability
Variable Gauge Undercarriage
The long variable gauge undercarriage is standard, providing a wide, stable base for operating, or a narrow gauge for reduced
shipping width. The undercarriage gauge in working position has been increased by 160 mm (6.3 in) for improved stability.
Upper Frame
The upper frame is designed for maximum durability and efficient use of materials. The boomfoot, skirt and counterweight
mounting area have been strengthened for longer service life and increased durability.
•
Outer frame utilizes curved side rails, which are die-formed, for excellent uniformity and strength through the length
• Box section channels improve upper frame rigidity under the cab
• Boom tower and one piece main rails are constructed of solid, high-tensile strength steel plates
Catwalk
The catwalk width has been increased by 110 mm (4.3 in) from the 365C L. Catwalks are provided on both sides of the skirt
for easy access of the maintenance points. Slip resistant plates are used on the full length of the catwalks.
Cross Roller Bearing
The 374D L swing bearing is a cross roller type, with 54 mm (2.13 in) diameter rollers. The cross rollers have a much greater
contact area than ball bearing, providing increased stability and longer life.
Track Roller Frames
The track roller frame is made of thick, steel plate that is bent into a U-shape and welded to the bottom plate to create a box
structure. The box structure design provides increased rigidity and impact resistance.