2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
SCV-series Screw Compressor 5.5 Reassembly
5-44
5.5.7.3 Tightening after Finishing the End Clearance Adjustment
(1) In case of 160 to 250V** models:
a)
Remove a hexagon head bolt [45] which is used to fasten thrust bearing gland [43], and insert
the conical spring washer [46] to prevent the bolt loosening. Then, screw and tighten the
hexagon head bolt again up to the specified tightening torque. Tighten the rest of bolts [45] in the
same manner.
b)
Bend the claw of lock washer [40] to the notch of lock nut [39], which tightens the thrust bearing
inner race, to prevent the lock nut loosening.
Steps a) and b) can be reversed.
(2) In case of 320V*D models:
a)
Remove the fastening bolts [45] and the thrust bearing gland [43].
b)
Attach the O-ring [150] to removed thrust bearing gland. Without inserting the conical spring
washers in the same manner as in the case of the end clearance measurement/alignment,
tighten the hexagon head bolts i n a diagonal sequence, a little at a time, and finally tighten them
to the specified torque. (See 7.3.4)
The procedures after this are same step (1) above.
Conical spring washer has been adopted instead of the plate type lock washer from October, 2001.
When using the conical spring washers for the compressors produced before th
hexagon head bolt heads may interfere with the bearing cover inner face.
In case of overhauling the
compressor produced before October, 2011, do not change the lock washer
to the conical spring
washer.
5.5.7.4 Installing the Balance Piston
Install the balance piston [30] on the M rotor shaft (suction cover side).
Then, use the external snap ring pliers to install the snap ring [32], and fix it in position.
Check that the snap ring is fully seated in the groove.
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