4.6 Replacing Seal Packing (16 and 17)
Please refer to Figures 2 and 4.
4.6.1 To replace Packing (16) for the Metering Auger Drive Shaft (11),
first remove the Metering
Auger (10) and then, unthread the Metering Auger Drive Shaft Seal Cap (14). Remove the
packing with a small screwdriver or needle-nose pliers and then, remove Spring (18). Once this
has been done, clean the inside of the hollow Intromitter (or Conditioning Auger) Drive Shaft (9)
and the outside surface of the Metering Auger Drive Shaft (11) where the Packing (16) seals
against the Metering Auger Drive Shaft (11). Carefully examine the Metering Auger Drive Shaft
(11) for wear and/or scoring; replace if worn or scored.
NOTE:
In order to best examine the Metering Auger Drive Shaft (11), the shaft should be
moved forward. Please refer to paragraph 4.5.6.
To reassemble,
first re-install the Spring (18) and then, carefully replace the packing, one ring at
a time. Make sure the packing is clean and has not picked-up any dirt in handling. Seat the
individual rings of packing firmly, making certain that the joints of successive rings are staggered
and kept at least 90 degrees apart (see Figure 4 and refer to NOTE 1 following paragraph 4.6.2).
Also, certain seal assemblies include a Synthetic Washer (20) at each end of Spring (18), which
must be installed as illustrated in Figure 4. After the packing has been replaced, install Seal Cap
(14).
4.6.2 To replace Packing (17) for the Intromitter (or Conditioning Auger) Drive Shaft (9),
the
Conditioning Auger (8), along with the Metering Auger (10), must first be removed. Then, follow
the disassembly procedures detailed in paragraph 4.5.7 to loosen and pull-back the Intromitter (or
Conditioning Auger) Drive Shaft (9), away from its Seal Cap (15), far enough to allow access to
the Packing (17). After this has been done, unthread the Intromitter (or Conditioning Auger) Drive
Shaft Seal Cap (15) and remove the packing with a small screwdriver or needle-nose pliers;
remove Spring (19). Once this has been completed, clean the inside surface of the Seal Housing
(5) and then, clean the outside surface of the Intromitter (or Conditioning Auger) Drive Shaft (9).
Carefully examine the exterior of the Intromitter (or Conditioning Auger) Drive Shaft (9) for wear
and/or scoring; replace if worn or scored. Also, check the Front and Rear Bushings (42) [internal
to the Intromitter (or Conditioning Auger) Drive Shaft (9)] in which the Metering Auger Drive Shaft
(11) rotates. If these bushings show wear, they must be replaced. [Bushings are worn if the
Metering Auger Drive Shaft (11) has excessive radial movement within the bushings.]
To reassemble,
first re-install Spring (19) and then, carefully replace the packing, one ring at a
time. Make sure the packing is clean and has not picked-up any dirt in handling. Seat the
individual rings of packing firmly, making certain that the joints of successive rings are staggered
and kept at least 90 degrees apart (see Figure 4 and refer to NOTE 1 below). Also, certain Seal
Assemblies include a Synthetic Washer (21) at each end of Spring (19), which must be installed
as illustrated in Figure 4. After the packing has been replaced, install Seal Cap (15) and then,
re-position the Intromitter (or Conditioning Auger) Drive Shaft (9) and secure.
NOTE 1:
The ends of each ring of packing are cut at a 45 degree angle. Make certain that when
installed, the packing ends meet as depicted in Detail “A” of Figure 4. Failure to do so
could result in premature seal failure.
NOTE 2:
To remove either the Metering Auger Drive Shaft (11) or the Intromitter (or Conditioning
Auger) Drive Shaft (9) from within Type PB Gearboxes (3), please refer to the Seal
Housing and Gearbox Assembly, paragraphs 4.5.6 and 4.5.7 respectively.
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