Section V. SCALPER VIBRATING SCREEN ASSEMBLY
146.
General
The scalper vibrating screen assembly removes the sand, dirt, and small rock and diverts it either through the
screen into the under hopper or passes it over the end of the screen into the diverter box or into the coarse chute. Rocks
that are too large to fall between the grizzly bars are fed into the crusher jaws. The scalper vibrating screen assembly
consists of a feed box, liners, grizzly bars, screen eccentric drive shaft, counterweight, reduction gear, under hopper,
diverter box, chutes and gates, electric motor, drive belt, and drive sheaves. The scalper vibrating screen assembly is
mounted on the crusher main frame with rubber mountings and diagonal I-beam supports.
147.
Scalper Vibrating Screen Drive Sheave
a.
Removal.
(1) Remove the belt guard (TM 5-3820-205-10/2).
(2) Remove the drive belt (par. 128).
(3) Remove the drive sheave as instructed on figure 76.
b.
Cleaning and Inspection. Clean and inspect all parts. Replace all defective or damaged parts as required.
c.
Installation.
(1) Install the drive sheave in reverse of the instructions on figure 76.
(2) Install the drive belt (par. 128).
(3) Install the belt guard (TM 5-3820-205-10/2).
148.
Eccentric Shaft Balance Wheels
a.
Removal.
(1) Remove the scalper vibrating screen drive sheave (par. 147).
(2) Remove the balance wheels as instructed on figure 76.
b.
Cleaning and Inspection. Clean and inspect all parts. Replace a defective or damaged part if necessary.
c.
Installation.
(1) Install the balance wheels in reverse of instructions on figure 76.
(2) Install the scalper vibrating screen drive sheave (par. 147).
Figure 76. Scalper vibrating screen sheave and balance wheel, removal and installation.
AGO 8165A
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