Xylem Goulds 3656 Manuel D'utilisation page 5

Flywheel
Housing
1
Dimensions
A 20 1 8
B 20 7
8
No. 12
C
Size 7 16 -14
Table 1
Figure 3
INSTALLATION
• The pump may be installed horizontally, with the discharge
rotated to any position allowed by the casing bolt pattern
(13). It is recommended that the discharge be located hori-
zontally, above the suction.
• The casing must be supported on all pumps by a rigid sup-
port which is anchored to the unit base or foundation.
• For M-Group pumps it is recommended that this support
is bolted to the motor adapter ring using 2 or more of the
casing bolts (13). It is likely that longer bolts will be required
for the additional support thickness. Use SAE grade 5 bolts,
torqued as indicated in this manual.
• For L-Group pumps it is recommended that the pump is
supported beneath the two feet cast into the motor adapter
(3). These feet must be bolted to the support.
PUMP TO ENGINE ASSEMBLY (SPLINE COUPLING)
Preparation for Assembly of Pump on Engine
• Clean face and register fit of flywheel housing and flywheel
as necessary to remove all grease, dirt, or rust (and all traces
of rust preventative) which would interfere with installation
of pump and/or prevent correct alignment. If flywheel is fit-
ted with a pilot bearing for a transmission shaft, remove and
discard. The pilot bearing is not required for installation of
the pump end, and could interfere with the pump shaft.
Figure 4
SAE Flywheel Housing Size
2 3 4
17 5 8 16 1 8 14 1 4 12
18 3 16 7 15 13
8 8
12 12 12
3 8 -16 3 8 -16 3 8 -16 3 8
• Examine shaft spline closely. Use a file, if necessary, to
remove any burrs that would prevent coupling from sliding
5
freely onto the shaft.
3 8
• Lubricate pump shaft spline sparingly with light grease.
1
Don't lubricate straight keyed shaft.
8
8
• Slide the coupling onto shaft until it is stopped against the
-16
shaft (refer to page 5 for straight shaft installation).
• Measure the distance from the engine side of the flywheel
coupling adapter ring to the mounting face of the pump
bracket. Refer to Figure 4 below, Dimension "A".
• Next, measure depth from face of flywheel housing on
engine, to face on flywheel against which coupling will be
bolted. Refer to Figure 4 below, Dimension "B".
• Pump measurement must be less than engine measurement
or axial interference will result in thrust force on engine
crank shaft bearings. Simply stated, Dimension "A" must be
less than Dimension "B".
FLYWHEEL COUPLING
• The flywheel coupling transmits power from the engine
flywheel to the pump shaft. The maximum power that a
coupling can safely handle is shown by a rating number, "R",
which is listed in the coupling dimensions tables.
• When selecting a flywheel coupling for a pump and engine,
first determine the power rating that the pump will demand.
On the pump performance curve, find the RPM and BHP
values required to produce the spplication head-capacity
point.
• Divide the BHP by the RPM, then multiply the result times
100. The result will be the demand number for the pump.
For example, a 20BFSAE1AO can deliver 800 GPM at 270
feet Total Head when running at 1800 RPM. The power
required by the pump will be 75 BHP . The demand number
will be: (75 / 1800) x 100 = 4.16
• Next, select a coupling that can safely transmit the power,
and which will fit the flywheel dimensions. For a coupling to
be suitable, it must have an "R" rating number GREATER
THAN the pump demand number. In the above example,
the minimum coupling "R" number whould be 5.
• Torsional compatibility of the engine, pump, and coupling
is the responsibility of the assembler. Goulds Water Systems
will supply data for the pump and coupling for use by the
assembler for a torsional analysis.
NOTE: If the flywheel is fitted with a pilot bearing pressed
into a bore at the center, remove it to avoid interference with
the pump shaft.
Figure 5
5