En
gl
is
h (
G
B)
6
Shimming of base frame
Fig. 5
Shimming of base frame and levelling of
pump
1. Lift/jack up the base frame to the final level 19-32
mm above the concrete foundation, and support
the base frame by means of blocks and shims,
both at the anchor bolts and midway between
bolts. See fig.
2. Level the base frame by adding or removing
shims under the base frame. See fig.
3. Tighten the anchor bolt nuts against the base
frame. Make sure the pipes can be aligned to the
pump flanges without putting strain on the pipes
or flanges.
Preliminary alignment
The pump and motor are pre-aligned on the base
frame from the factory. Some deformation of the
base frame may occur during transport and it is
therefore essential to check alignment at the
installation site before final grouting.
Inaccurate alignment results in vibration and
excessive wear on the bearings, shaft and wear
rings.
Carry out alignment of the motor by placing shims of
different thickness under the motor. If possible,
replace several thin shims with one thick shim.
The preliminary alignment procedure has four steps:
1. Checking coupling clearance
Make sure that the gap between the coupling halves
is equal to the values in the table and that the
keyways are 180 ° displaced.
2. Checking soft foot on pump and motor
A pump or a motor having a soft foot can be
compared to sitting down at a table and finding that
the table rocks when someone leans on it.
Technically, it is a condition where the feet of a motor
or a pump are not at the same level as the base
plate.
To check for soft foot, set the pump or motor on its
base plate and bolt it down. Set a dial gauge on one
foot, loosen the hold-down bolt, and watch the dial
gauge. If the dial gauge indicator moves while
loosening the bolt, the pump or motor has soft foot.
The movement measured by the dial gauge indicates
how many shims you need to level the pump or
motor. Repeat this procedure at all four corners.
If the pump was installed a long time ago, the
stresses induced in the pump casing by soft foot can
cause permanent deformation of the casing.
3. Checking parallel alignment
Place a straight edge across both coupling rims at
the top, the bottom and both sides. See fig.
. After
each adjustment, recheck all features of alignment.
Parallel alignment is correct when the measurements
show that all points of the coupling faces are within
0.2 mm of each other.
Fig. 6
Checking parallel alignment
TM
04
03
81
06
08
DANGER
Electric shock
Death or serious personal injury
- Before starting work on the pump, make
sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Carry out alignment of the motor only, as
pipe strain will occur if the pump is shifted.
For a coupling with
an outside diameter
of
∅
[mm]
Coupling clearance
[mm]
Nominal
Tolerance
∅
90-213
3.2
0/-1
∅
251-270
4.8
0/-1
∅
306-757
6.4
0/-1
TM
03
02
0
9
45
04
Vertical
Horizontal
