Alfa Laval AFPX 617XGV-14/74CG, Instruction Manual

Page: 97 / 154

97
3 Dismantling/Assembly 3.4 Intermediate Service (IS), assembly
d. Fit the lock ring spanner and tighten the
large lock ring, first by hand.
Then advance the lock ring by giving the
spanner handle some blows until the
φ
-marks are in line or passed.
Left-hand thread!
Check of disc stack pressure
•
If the disc stack pressure is correct it should
be possible to tighten the lock ring so far by
hand that the
φ
-mark on the lock ring is
positioned 20-30 mm before the mark on the
bowl hood when the compressing tool is
used.
To achieve this an appropriate number of
discs in the disc stack beneath the top disc
must be fitted. Add or remove discs if
necessary.
If the
φ
-marks do not reach or pass each
other after giving the spanner handle some
blows, the reason could be an incorrectly
assembled bowl or too many discs in the disc
stack. Reassemble and check.
NOTE
When checking the disc stack pressure in
this way, the threads of the lock ring and the
bowl body must be well cleaned.
NOTE
Ensure that the disc stack pressure is
sufficient to maintain bowl balance.
Insufficient pressure in the disc stack can
cause vibration and reduce lifetime of ball
bearings.
G
0
571
1
9
1
S
0
098
81
1
G
0
1
358
1
1
φ
-marks on bowl body and lock ring in line