Pompetravaini TRSK 2002/1, Operating Manual, Page: 14 / 32

Operating manual liquid ring vacuum pumps TRVK - TRSK
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If the maximum value of "X" is higher than that listed in the tab. 2 (for the given coupling size) it will be required to
correct the alignment by using shims under the pump or motor feet.
When the measured values fall within the tolerances, the pump and motor mounting bolts can be tightened.
10 - Angular misalignment can be measured with a Calliper. Measure the outside coupling dimension at several points
(see fig. 14).
Find the minimum and maximum width of the coupling, the difference between these two readings "Y" (Y1-Y2) should
no exceed the value listed in tab. 2 for the given coupling size.
Should this value be greater it will be necessary to correct the alignment by shimming the pump and/or motor.
Following this operation it is recommended to check once more the value "X" to make sure that both values are within
the allowed tolerance (see point 9).
Make sure that both set screws on the coupling halves are properly secured.
Tab. 2 COUPLING
“Ø A” mm
GAP
“S” mm
PARALLEL
"X" mm
ANGULAR
"Y" mm
60 to 80 2 to 2,50 0,10 0,20
100 to 130 2 to 2,50 0,15 0,25
150 to 280 3 to 3,75 0,15 0,30
315 to 400 4 to 5 0,25 0,40
11 - Install the coupling guard and its extension (if applicable) on the pump, secure the two locking bolts.
The gap between motor frame and the guard should not be greater than 2 to 3 mm (see fig. 15).
2 to 3 mm
Fig. 15
7.4 BELT DRIVE ALIGNMENT PROCEDURE
If the pump is fitted with belt drive, it is necessary to verify the tension of the belts at the first start-up and periodically (at
least every 6 months) as described (see figure 16).
- Disconnect the electrical power from the motor of the pump, with the
PUMP STOPPED remove the guard from the
pulley/belt assembly.
- Rotate the pulleys, finding the tension indicator printed on the back of the belt
- Measure the distance between the 2 stamped reference points verifying that it corresponds to the indicated dimension.
In the case of non-conformance, it is necessary to reset the center distance between the two pulleys (pump and motor)
using the screws of the sliding base placed under the motor.
- Rotate the pulleys a few revolutions and re-check the length between the two reference points: if the distance is correct
their mounting tension is also correct.
- Replace the guard on the pulley/belt assembly.
WARNING: Belt over-tension can cause serious damage to the bearings of the pump and electric motor, belt under-
tension can cause a premature wear of the belts.
NOTE: During the first period of operation, it may be noted the presence of dust due to settling wear of the belts, this is
a normal phenomena.
For more information consult Pompetravaini.
Fig. 16
POMPA
STAMPATI
RIFERIMENTI
CARTER DI
PROTEZIONE
SLITTE
TENDICINGHIE
MOTORE
ELETTRICO
PUMP
STAMPED
REFERENCE
GUARD
ELECTRIC
MOTOR
SLIDING
BASE