Metso MP1000, Technical Reference Manual

Page: 178 / 180

SECTION 5 - ECCENTRIC ASSEMBLY
5-2
MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
Molded, nonmetallic stationary T-seals and U-seals,
cemented into grooves around the top and bottom
of the counterweight provide a labyrinth type seal
that prevents oil leakage and protects the gear,
pinion and bearing surfaces from dust infiltration.
5.2 Assembly Instructions
5.2.1 Eccentric Assembly Installation
Procedures for assembling the various components
are given in the Maintenance portion of this section
(refer to Figure 5-1). The eccentric assembly is to
be installed as follows:
1. Thoroughly clean the outside and top
surface of the main shaft, the gear well
surfaces of the main frame and the bore of
the eccentric bushing. Remove any nicks,
scratches and burrs. Clean the top surface of
the lower thrust bearing fastened to the main
frame and the bottom surface of the upper
thrust bearing bolted to the underside of the
eccentric.
2. The bolts holding the lower thrust bearing to
the main frame should be checked for
tightness. They should be tightened to a
torque value of 470 Nm (345 ft. lbs) without
lubrication.
3. The bolts holding the upper thrust bearing to
the eccentric should be checked for
tightness. They should be tightened to a
torque value of 373 Nm (275 ft. lbs) without
lubrication.
4. Turn the countershaft slightly until a pinion
root is in a vertical position as shown in
Figure 5-2.
5. Fasten the lifting ring (furnished with the
special tools) to the top of the eccentric
using the tapped holes in the top of the
eccentric. Install two ring bolts, also
furnished with the special tools, into the
lifting ring. Refer to Figure 5-3 for correct
lifting of eccentric assembly. Apply a light
coat of oil to the main shaft, eccentric
bushing and both thrust bearings.
6. Connect a suitable lifting device to the ring
bolts and carefully lower the eccentric
assembly over the main shaft. The beveled
edge of the eccentric bushing will help
center the assembly. Lower the assembly
until the upper thrust bearing is resting on
the lower thrust bearing. Also position one
of the large cored kidney shaped slots in the
counterweight directly over the pinion. It
may be necessary to rotate the eccentric
slightly to fully mesh the gear into the
pinion.
7. Be sure the gear and pinion have properly
meshed and are in their correct relationship
to each other. This can be checked by
measuring the distance the shaft extends out
of the eccentric bore. This distance is
approximately 135 mm (5.31") for the
MP1000 or 140 mm (5.51") for the MP800
as shown in Figure 5-1. Refer to Checking
or Adjusting Backlash and Root Clearance
in this section for procedure for checking
backlash and root clearance.
Figure 5-2 Checking Backlash and Root
Clearance
5.2.2 Checking or Adjusting Backlash and
Root Clearance
The proper method of setting a set of gears on a
new or older Crusher is to try to obtain the
recommended backlash. There are two accepted
methods for determining the backlash between the
pinion and the gear. The first method is to measure
the circumferential motion of the countershaft at a
radial distance out from the countershaft that
Callout Description
1 Gear
2 Backlash
3
Gear tooth must be vertical to take an
accurate measurement
4 Root clearance
5 Pinion
5
2
3
4
1