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Shot Meter Assembly / Piston Rod Seal
Piston Rod Seal Service is typically necessary when
the grease for the seals becomes contaminated with
the material that is being applied, or if the material
being applied leaks down the displacement rod during
operation.
Refer to the Parts information on page 20 and 22 when
performing the following procedure to disassemble and
assemble the shot meter.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Disassembly
1. Relieve the fluid pressure and air pressure.
2. Purge the system as completely as possible, and
disconnect the dispenser hoses, transducer,
proximity switches, and other attachments.
3. Shut off electrical power to Ultra–Flo unit.
4. Disconnect motor electrical connections.
5. If unit will be moved to another location for repair,
remove the unit from the dispenser support (22) by
removing the four bolts, washers and nuts (43, 44,
45) (two on each side) holding the unit on the
dispenser support.
NOTE: This step is not necessary if the unit will be
repaired at installed location.
6. Remove the six hex screws, washers, and grom-
mets, (58, 71, 70) holding the meter guard (66) in
place. Remove the meter guard.
7. Remove (unscrew) the cylinder (6).
NOTE: Removing the cylinder at this point allows clear
access to remove the eight cap screws from unit.
8. Remove the pin (82) from the linear bearing brack-
et (15) which holds the piston rod (7) to the brack-
et.
9. Remove the eight cap screws and washers (67,
83) from the flange of the meter housing (5) (four
of the eight cap screws are attached to linear
bearing shafts (17). When removing the four bolts
from shafts (17) use wrench on flats located
towards the bottom of the shaft to prevent shaft
from turning.
Service
10. Remove the split rings (72) when bolts are re-
moved.
11. Remove the piston rod (7) and meter housing (5)
from the pump mount plate (2).
NOTE: When split rings are reinstalled they must be
positioned with curved edge down. Holes can be
aligned as desired.
12. Remove piston rod (7) by turning the unit upside
down and putting pressure on top. Piston rod can
also be removed by tapping on top with plastic or
rubber hammer.
13. Remove seal retainer (9) from piston rod (7). The
seal retainer will probably come out when piston
rod is removed. If not use a plastic rod inserted
into grease cavity and pound out of meter housing
(5).
NOTE: Check to make sure that both spacer seals (8)
are removed (top spacer seal could remain in hous-
ing).
14. Clean material from meter housing (5).
15. Remove the following items from seal retainer (9):
D two spacer seals (8)
D upper and lower Polypak packing seals (10)
D Lower o–ring (13)
D Upper o–ring (12)
D wear bands (11)
NOTE: wear bands have diagonal cut to aid in removal
and installation.
Reassembly
1. Inspect retainer seal (9), spacer seals (8), Polypak
packing seals (10), wear bands (11) and o–rings
(12, 13) for wear. Replace if necessary.
2. Install both the upper and lower wear bands (11).
3. Apply a light coating of grease on both seals (10)
and insert seals so that packing lips face toward
the top (narrow end) of retainer seal (9). Be sure to
press seals completely into retainer seal.
4. Place o–rings onto seal retainer (9) making sure
larger o–ring (13) goes on larger bottom of unit
and smaller o–ring (12) on top.
5. Grease inside of seals and wear bands as well as
both o–rings and outside of housing.
6. Replace top spacer seal (8) and insert narrow part
of unit into meter housing (5).
309280 17
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