mycom 3225**C Series User Manual

2202MYJE-MY-C8-N_2018.02.
Chapter 5 Maintenance and Inspection
Compound 2-stage Screw Compressor 3225**C 5.5 Reassembly
5-51
c) Without inserting the conical spring washer, tighten the four fastening bolts of the bearing gland
sequentially and evenly up to the specified tightening torque (Photo 083). Tightening each bolt at
once at the specified torque must be avoided because it will result in uneven tightening. So, repeat
to sequentially tighten the bolts for several times.
d) Then, read the dial gauge indication. This value shows the actual end clearance. If the end
clearance is outside the specified value, perform the adjustment work described in the next section.
If the end clearance is within the specified value, turn the M rotor shaft by hand and confirm the
smooth turning without uneven tightening. And then perform the measurement of the run-out of the
rotor shaft described in next section (3).
Table 5-10 Tightening Torques for the Thrust
Bearing Gland
Compressor
Tightening torque
N･m
kgf cm
3225**C
High-stage
60
600
Low-stage
120
1200
Figure 5-17 Measurement of the End Clearance
5.5.8.2 End Clearance Adjustment Procedure
(1) When the end clearance is less than the specified value
In this case, a shim (thrust adjustment liner) must be inserted between the thrust alignment
spacer [42] and the inner race of the thrust bearing to increase the end clearance.
The thickness of the shim must be determined by the difference between the specified end
clearance and the measured value.
◆ Although the thrust adjustment liner is not shown in the sectional view and exploded view,
you can place an order to us indicating the model name.
(2) When the end clearance exceeds the specified value
If any shim (thrust adjustment liner) has been inserted between the thrust bearing alignment
spacer and the inner race of the thrust bearing, and the thickness corresponds to the difference
between the measured end clearance and the specified value, just remove the shim.
If no shim is used or the thickness of the shim is insufficient to compensate for the excess end
clearance, use a surface-grinding machine (or ask a vendor) to make the thrust bearing
alignment spacer [42] thinner by the amount of the end clearance difference between the
measured and specified values. After the surface grinding is done, use a micrometer to measure
the thickness of the spacer for the entire circumference to make sure the thickness is uniform.
Photo 083

mycom 3225**C Series Specifications

General

Brand	mycom
Model	3225**C Series
Category	Compressor
Language	English