MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
5-1
Eccentric Assembly
S
ECTION
5
5.1 Description
This section covers the eccentric assembly
including the eccentric, eccentric bushing, gear and
counterweight. The eccentric which has an offset
bore provides the means whereby the head follows
an eccentric path during each cycle or rotation. An
eccentric bushing locked into the eccentric bore
provides the bearing surface for the main shaft.
Note that although not part of the eccentric
assembly, an eccentric bushing Resistance
Temperature Detector (RTD) is mounted to the
mainframe just beneath the lower edge of the
eccentric bushing. This RTD monitors the
temperature of the oil exiting the lower end of the
eccentric bushing.
A large bevel gear bolted to the bottom of the
eccentric is driven by the pinion on the
countershaft. The eccentric rotates around the
stationary main shaft. The entire assembly is
supported by a set of thrust bearings; the upper
thrust bearing is bolted to the bottom of the
eccentric and the stationary lower thrust bearing is
bolted to the main frame. Backlash and root
clearance between gear and pinion teeth are
maintained in this assembly by the addition or
subtraction of shims inserted beneath the lower
thrust bearing.
The counterweight installed on the eccentric has a
light and heavy side and is positioned so as to
reduce the unbalanced forces created by the motion
of the head assembly. Protecting the MP1000
counterweight from falling discharging material is
the counterweight guard bolted to the
counterweight. Refer to Figure 5-1.
Protecting the MP800 counterweight is a
counterweight guard that is bolted to the
counterweight. Refer to Figure 5-1.
Figure 5-1 Eccentric Assembly Installation
Callout Description Callout Description
1 Upper thrust bearing 9 Couterweight location dowel
2 M30 Capscrews 10 Counterweight guard
3 Ring bolts 11 Gear
4 Lifting ring 12 Main frame
5 Lower thrust bearing 13 Pinion
6 Eccentric 14 135 mm (5.31")
7 Eccentric Sleeve 15 140 mm (5.51")
8 Main shaft
MP1000
MP800
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