30119-16 Rev. 4.9/07-09
4
D. STRAIGHTENING VANES are recommended when
there are less than ten pipe diameters of straight pipe
(no fittings or obstructions) directly upstream from the
meter location. Straightening vanes are available from the
factory. (See Straightening Vane Installation Instructions
if required for your meter.)
E. METER ASSEMBLY should be placed on the pipe
with the propeller nose facing the upstream flow in the
pipe. Use care when installing the meter not to damage
the propeller as it passes through the saddle opening.
Make certain that the meter saddle is correctly positioned
and centered in the cutout opening before attaching the
meter to the pipe. WARNING: Customers are warned
that the U-Bolt nuts are to be tightened evenly to approxi-
mately 30 foot pound torque. This is sufficient to seal
the saddle to the pipeline. Additional tightening may be
required to seal the saddle on rough or irregular pipe.
ELECTRONIC LOW PRESSURE METER
OPERATION AND MAINTENANCE MANUAL
III. MCCROMETER products have been carefully designed to
be as maintenance free as possible. Periodic preventive
maintenance, however, is highly recommended and should
be practiced according to schedule to assure continuous
accuracy and trouble-free performance of your propeller
meters. The maintenance and inspection procedure can
also be used as a guide to locating a problem in the unit
that may be the cause of abnormal meter operation.
Routine preventative maintenance should be performed
on all meters, which includes cleaning and an inspection
of the propeller and its bearing. The interval between
inspections depends on the water quality and the usage
of the meter. The initial inspection should be performed
after one to two years of service, to determine the period
between future inspections. After five to ten years, the
complete meter should be inspected to ensure years of
dependable service.
IV. METER SADDLE ASSEMBLY (#26) should be removed
from the service line by removing the U-strap nuts (#23)
and lifting up the rear (downstream) portion of the meter
saddle (#26), carefully pulling the assembly back (down-
stream) and up at the same time to allow the propeller
(#2) to clear the cutout opening in the pipeline so the
meter can be lifted free. Inspect the meter saddle O-ring
(#22) for any sign of damage and replace if necessary.
Replace the meter assembly (#26) with a dummy cover
saddle if the service line is to remain in operation.
V. WORKING AREA chosen for disassembly and reassembly
of the meter components should be clean to reduce the
chance of dust or dirt particles being introduced into the
propeller area.
VI. DISASSEMBLY AND INSPECTION OF METER includes
cleaning the propeller assembly (#1), ceramic sleeve bear-
ing (#8), separator assembly (#12), and drive magnet
(#9).
1. PROPELLER REMOVAL can be accomplished by
first removing the thrust bearing cartridge assembly (#5).
Loosen the set screw (#27) in the side of the nose of
the propeller. Remove the thrust bearing cartridge (#5)
by turning it counterclockwise while holding the propeller
in place.
2. REVERSE THRUST BEARING CARTRIDGE (#6)
must now be removed. Turn the propeller (#2) so that
the allen wrench clearance hole is lined up with the set
screw in the side of the reverse thrust bearing cartridge
(#6). The location of the set screw is marked by a
small hole drilled in the face of the reverse thrust bearing
cartridge. With a 5/64 inch allen wrench, loosen the set
screw (#7) in the reverse thrust bearing cartridge (#6)
two to three turns, which will allow the cartridge to be
unscrewed without damaging the spindle thread. Note:
If the bearing area appears to be clogged with dirt or
sediment, making it difficult to locate the set screw (#7)
or to allow the allen wrench to fit into the set screw
socket, then the bearing area should be flushed out with
water. Insert Tool T-2402X-1 into the propeller through
the threaded nose. The tabs in the tool should engage
in the screwdriver slot in the end of the reverse thrust
bearing cartridge (#6). Remove the propeller assembly
(#1) and reverse thrust bearing cartridge (#6) by turning
Tool T-2402X-1 counterclockwise unscrewing the reverse
thrust bearing cartridge (#6) from the spindle (#12). The
propeller assembly with reverse flow cartridge will now
slide off the spindle. WARNING: If the reverse thrust
cartridge does not unscrew easily, it may be because
the set screw was not unscrewed enough. If unscrew-
ing the reverse flow cartridge is continued with the set
screw binding on spindle thread, damage to thread could
occur.
3. WATER LUBRICATION of the ceramic sleeve bear-
ing (#8) is achieved by means of two openings in the end
of the thrust bearing cartridge (#5) which allow air to be
purged from the bearing area. These should be cleared
of any foreign material by running a small wire through
the holes on either side of the screwdriver slot.
4. CERAMIC BEARING CARTRIDGE (#8) and drive
magnet (#9) should be cleaned of any foreign material and
inspected for damage. Using a bottle brush, thoroughly
clean the ceramic bearing surface (#8) and the magnet
inside diameter (#9). After cleaning the propeller, flush
the inside out with water. The outside surfaces of the
propeller should also be cleaned to assure a smooth,
unrestricted flow across the surface of the propeller. Do
not use an oil based solvent in cleaning, as damage to
the assembly could occur.
5. SPINDLE CERAMIC SLEEVE and the O.D. or
surface of the separator (#12) should be cleaned and
inspected for any substantial amount of wear. The thrust
bearing (#5) should be checked for any damage. If it is
determined that the spindle ceramic sleeve or separator
are worn sufficiently, the separator/support spindle as-
sembly (#12) should be replaced.
