Metso MP1000, Technical Reference Manual

Page: 180 / 180

SECTION 5 - ECCENTRIC ASSEMBLY
5-4
MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
Should the measurements be more than
specified, metal shims of the proper
thickness must be removed.
5.2.2.2 For Straight Bevel Gear Sets
(Circumferential Measurement Method)
Follow the procedure as noted above for the spiral
bevel gear sets, but see Tables 5-1B (MP800), 5-2B
(MP1000) for acceptable levels of backlash and
Table 5-3B for the effects of adding or removing
shim thickness.
5.2.2.3 For Straight Bevel Gear Sets
(Direct Backlash Measurement Method)
1. Remove all clearance between the eccentric
bushing and the main shaft by placing a
hydraulic jack between the inside diameter
of the frame and counterweight, in line with
the counterweight location dowel in the
eccentric flange, pushing the thick side of
the eccentric toward the main shaft. Use
only enough force as is required to slide the
eccentric assembly toward the main shaft.
Using excessive pressure could tip the
eccentric assembly and give incorrect
readings. While maintaining pressure on the
eccentric, pull the countershaft outward to
take up the end float and rotate the shaft
clockwise and counter-clockwise to reach
the limits of motion allowed by the
backlash.
2. To check the backlash, rotate the
countershaft until the pinion tooth just
touches the gear tooth. Measure and note the
clearance on the opposite side of the tooth
with a feeler gauge at the center of the tooth.
The feeler gauge is to be long enough to
measure the clearance at the center of the
gear and pinion tooth face. Note that a feeler
gauge of at least 6 inches (152.4 mm) in
length will be required to reach the center of
the tooth. Refer to Tables 5-3A (MP800) and
5-2C (MP1000) for the acceptable level of
backlash and minimum root clearance.
3. Then measure and note the root clearance.
4. If the backlash and/or root clearance is
found to be less than that which is specified
in Table 5-3A (MP800) or Table 5-2C
(MP1000), the eccentric assembly is to be
removed and metal shims of the proper
thickness are to be added under the lower
thrust bearing as described in Section 3
under
Lower Thrust Bearing and Shim
Replacement . Refer to Table 5-3B. Adding
shims will raise the eccentric assembly and
move the gear away from the pinion, thereby
increasing the backlash and root clearance.
Should the measurements be more than
specified, metal shims of the proper
thickness must be removed.
NOTICE
On MP series units that are assembled and
tested prior to shipment to the customer,
shims placed beneath the lower thrust
bearing when the Crusher left Metso
Minerals are of the required thickness to
provide proper backlash and root clearance.
These shims, while placed in the Crusher
initially for backlash adjustment, are
primarily used for wear compensation.
NOTICE
On MP series units that are assembled and
tested prior to shipment to the customer,
shims placed beneath the lower thrust
bearing when the Crusher left Metso
Minerals are of the required thickness to
provide proper backlash and root clearance.
These shims, while placed in the Crusher
initially for backlash adjustment, are
primarily used for wear compensation.