SUNWARD SWDM40 - Upper-Carriage and Luffing Mechanism

SWDM40 OPERATION & MAINTENANCE MANUAL
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Crawler travel system (see fig 2-3) is composed of guide wheel, tension device, crawler
assembly, carrier roller, track roller, drive wheel, travel reductor etc. Crawler regulating system
keeps its tension by using high pressure lubricant. Hydraulic system controls travel system to
complete moving forward/backward, left/right, turning etc.
Crawler tension unit (FIG. 2-4) is composed of tension cylinder, tension spring, guide wheel,
oil cup. Track tension is regulated by hydraulic; tension spring must exist precompression
which can make crawler tension and ensure meshing between crawler pin and drive wheel.
Important：Lubricating grease leakage cannot be checked through safety valve.
FIG. 2-4
1. Idler 2. Cushion spring 3.Tension cylinder 4. Grease nozzle
2.3.3 Upper-Carriage and Luffing Mechanism
Sunward upper-carriage design is considering stability and multifunction application demand,
easy operation and maintenance. Hydraulic and electrical pipelines are arranged in different
layers, beautiful and clear integral layout.
2.3.3.1 Swing Platform
All parts in upper-carriage（including big roller main winch, Auxiliary winch, hydraulic oil tank,
power system, air conditioner etc. ） are fit under turntable. According to rig work condition,
turntable stress is complicated. Turntable is a welding part, the 3-D stressed analysis is showed
in fig 2-5.
1. Travel reduction motor 2. Drive sprocket 3. Track roller
4. Track assembly 5. Idler and tension device
FIG. 2-3