2202L5JE-DA-C5-N_2015.05.
5 Maintenance and Inspection
Compound 2-stage Screw Compressor
5.5
Reassembly
1612LSC Speed Increaser Type
5-54
5.5.6.2
End Clearance Adjustment Method
(1) When the end clearance is smaller than the specified value
To deal with this, insert shim material (thrust adjustment liner) of required thickness (difference in
thickness from the specified value) between the thrust bearing alignment spacer [42] and thrust
bearing inner race.
* The thrust adjustment liner is not shown in the sectional view and development view, but available
from us. Place an order together with a model name.
Or using a highly accurate surface grinding machine or asking professional service vendors to
grind, grind the surface of thrust bearing outer race spacer [41] by the difference from the specified
value. After grinding the flat surface, measure the whole circumference of the saucer by using a
micrometer, and check that the thickness is even.
(2) When the end clearance is larger than the specified value
As the end clearance is excessive, remove shim material (thrust adjustment liner) of a thickness
equal to the difference between the measured value and the specified value if the shim material is
used between thrust bearing alignment spacer and thrust bearing inner race.
Or if the shim material is not used between thrust bearing alignment spacer and thrust bearing inner
race, or even if used but insufficient thickness, grind the surface of thrust bearing alignment spacer
[42] by the difference between the measured value and the specified value or ask professional
service vendors to do so.
After grinding the flat surface, measure the whole circumference of the spacer by using a
micrometer, and check that the thickness is even.
(3) Rotor runout measurement
When the end clearance has been adjusted to within
the specified range, place a dial gauge probe
on the low-stage M rotor shaft on which a side bearing for the speed increaser gear is to be installed.
Measure the runout by turning the rotor shaft. The tolerance for runout is 0.03 mm or less for
all
models.
Runout occurs when the thrust bearing alignment spacer and saucer are not parallel or when the
thrust
bearing mark is not at the correct side. And it occurs if fastening the lock nut performed
without changing the position of the lock nut wrench (i.e., the uneven fastening of the lock nut).
Moreover small particles of dirt trapped between parts may cause excessive runout.
If the rotor runout is over the tolerance, even if the end
clearance is within the specified range,
disassemble
and adjust the relative positions of the spacer, alignment spacer and thrust bearing.
5.5.6.3
Tightening after End Clearance Adjustment
a) Bend the lock washer tooth to the notch of the lock nut which is tightening the thrust bearing inner
race, to prevent rotation.
b) Remove the hexagon head bolts that are tightening thrust bearing gland [43] one by one. Insert
spring washers [46] as rotation stoppers, and tighten to the specified torque again.
After Thrust Bearing Gland Tightening Securing the Speed increaser Driven Gear
