Viking Pump NORD TSM For NORDBLOC.1 Reducers - Manual (Page 9)

DRIVESYSTEMS
SOLID SHAFT CONNECTIONS
RETAIN FOR FUTURE USE
4. Coupling installation
The performance and life of any coupling depends upon how
well it is installed. Coupling hubs are typically mounted flush
with the shaft ends, unless specifically ordered for overhung
mounting. Shaft couplings should be instaIIed according to
the coupling manufacturer’s recommendations for gap, an-
gular and paraIIeI aIignment. To help obtain critical shaft
alignment coupling hubs may be installed to the machine
shafts prior to final shimming or tightening of the founda-
tion bolts. Proper coupling alignment aIIows for thermaI and
mechanicaI shaft movement during operation and ensures
that only torque (no radial load) is transmitted between the
mating shafts.
Coupling gap and angular alignment
The shaft gap must be sufficient to accommodate any antici-
pated thermal or mechanicaI axiaI movement. When setting
the coupling gap, insert a spacer or shim stock equal to the
required spacing or gap between the coupIing hub faces.
Measure the clearance using feeler gauges at 90-degree in-
tervals, to verify the angular alignment.
Parallel (or offset) alignment
Mount a dial indicator to one coupIing hub, and rotate this
hub, sweeping the outside diameter of the other hub. The
paraIIeI or offset misalignment is equal to one-half of the
total indicator reading. Another method is to rest a straight
edge squarely on the outside diameter of the hubs at 90°
intervals and measure any gaps with feeler gauges. The maxi-
mum gap measurement is the paraIIeI or offset misalignment.
Check alignment
After both angular and paraIIeI alignments are within speci-
fied Iimits, tighten aII foundation boIts securely and re-check
critical aIignment. If any of the specified Iimits for aIignment
are exceeded, realign the coupIing.
5. Installing sheaves (pulleys), sprockets and gears
To avoid unnecessary bearing loads and additional shaft de-
flection, mount all power take-off devices (sprockets, pulleys,
gears, etc.) so that the applied load center is as close to the
gear housing as possible, as shown in Figure 2.
Figure 2: Sprocket or Gear Mounting
Sprocket
Sprocket Hub
Preferred Mounting of Sprocket or Gear
Align the driver sheave or sprocket with the driven sheave
or sprocket by placing a straight-edge length-wise across
the face of the sheaves or sprockets. AIignment of bushed
sheaves and sprockets should be checked only after bushings
have been tightened. Check horizontal shaft alignment by
placing one leg of a square or a level vertically against the
face of the sheave or sprocket.
Always check component alignment and tension any belts or
chains per the manufacturer’s recommendation. The ideal
belt or chain tension allows proper wrap of the driver and
driven wheels, while maintaining the lowest possible tension
of the belts or chain, so that no slipping occurs under load
conditions. Check belt or chain tension frequently over the
first 24 to 48 hours of operation.
STOP
HARMFUL SITUATION
STOP
When using external chain or belt drives, make sure
the reducer is sized so that the shaft and bearings have
adequate capacity. To avoid unnecessary bearing loads
and additional shaft deflection, mount all power take-off
devices (sprockets, pulleys, etc.) so that the applied load
center is as close the gear housing as possible and check
component alignment and tension of any belts or chains
per the manufacturer’s recommendation. Do not over
tension the belts or chains.
6. Outboard pinion gear alignment
Align outboard pinion gears and adjust the gear tooth clear-
ance according to the manufacturer’s recommendations,
checking for acceptable outboard pinion tooth contact. The
foundation boIts may have to be Ioosened and the gear unit
moved slightly to obtain proper gear tooth contact. After
the unit is moved to correct tooth contact, the prime mover
may need to be realigned.
U10250 - 2 of 2
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