2200M4JE-HO-iS2-N_2014.04.
Chapter 5 Maintenance
Screw Compressor i-series
5.6 Reassembly
5-27
5.6.6.2 End
Clearance
Adjustment
When 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 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 thrust
bearing outer race spacer by using a micrometer, and check that the thickness is even.
When 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 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.
Rotor axial runout measurement
When the end clearance has been adjusted to within the specified
range, place a dial gauge on the seal attachment portion of the M
rotor shaft (FIgure 5-4) . Measure axial runout by turning the rotor
shaft.
The tolerance for axial runout is 0.03 mm or less for all models.
Runout occurs when the thrust bearing alignment spacer and outer
race spacer are not parallel or when the thrust bearing mark is not
at the correct side. Small particles of dirt trapped between parts
may cause excessive runout.
If axial runout is over the tolerance, even if the end clearance is
within the specified range, disassemble and adjust the relative
positions of the thrust bearing outer race spacer, alignment spacer
and thrust bearing.
This is important because it affects the life of the mechanical seal
and its performance. If axial runout still exceeds the tolerance even when no such assembly
problems exist, contact us. The rotor shaft may be bent.
5.6.6.3
Tightening after End Clearance Adjustment
a) Bend the lock washer claw to the notch of the lock nut
which is tightening the thrust bearing inner ring,to prevent
rotation.
b) Remove the hexagon head bolts that are tightening
thrust bearing gland
【
43
】
one bye one.
Insert spring washer
【
46
】
as rotation stopper, and
tighten to the specified torque again.
In case of i160, use a flat washer
【
46-2
】
and spring
washer
【
46-1
】
, and tighten to the specified torque.
Photo 027
Bending the Lock Washer Claw
Figure 5-4 Dial gauge
position (example i125)