8
Pressurize seal chamber to 10 P.S.I. and check for leaks
as outlined above. (See Figure 3)
CAUTION ! - ALWAYS WEAR EYE PROTEC-
TION WHEN WORKING ON PUMPS.
CAUTION ! - PRESSURE BUILDS
UP EXTREMELY FAST, INCREASE
PRESSURE BY “TAPPING” AIR
NOZZLE. TOO MUCH PRESSURE
WILL DAMAGE SEAL. DO NOT
EXCEED 10 P.S.I.
E-2) Impeller ,Cutters and Volute Service:
E-2.1) Disassembly and Inspection:
To obtain access to the impeller (14) or shredding ring
(16), fi rst remove screw (26) and washer (25). Then
holding the motor shaft stationary with a screwdriver,
tap the radial cutter (23) loose in the counter-clockwise
direction and remove, (Heat may be needed to break the
screw (26) loose.) Next remove nuts (21) and washers
(9) from stud (22) and pull the body (19) and square
ring (20) from the rest of the pump. Remove shims (24)
from shaft, then impeller (14) can be removed by turning
it counter-clockwise while holding stationary the motor
shaft with a screwdriver.
NOTE:
With the impeller (14) re-
moved, the seal spring is relaxed and some oil may seep
from the seal cavity.
DO NOT
store this pump without the
impeller (14) in place to hold the seal shut.
To remove or reverse the shredding ring (16) fi rst remove
the three fl at head allen screws (18) and lift the throat
(17) out of the body (19). The shredding ring (16) is
press fi tted in the body (19) and must be removed with
an arbor press.
After a number of years of service or whenever the
shredding ring (16) cutting edges dull, the part can be
pressed out of the body (19) and reversed to utilize the
opposite cutting edges and replaced in the body (19).
To maintain effi cient grinder pump operation, care should
be taken to keep both the radial cutter (23) and shred-
ding ring (16) cutting edges sharp. Neither part can be
sharpened to renew the cutting ability. The radial cutter
(23) must be replaced and the shredding ring either
reversed or replaced.
E-2.2) Reassembly:
To replace impeller (14) on shaft, turn clockwise while
holding shaft stationary with a screwdriver. Then replace
shims (24) on motor shaft. Important that the same
quantity be replaced as removed.
Next install shredding ring (16) by pressing into body (19)
with the use of an arbor press.
NOTE:
It is important that
the grooves in the shredding ring are at the top of the
pump and the solid part is to the bottom. This is to keep
some solids from setting in the grooves and causing a
jam at start up. Then insert throat (17) into body (19) with
three fl at head allen screws (18). Apply a thin coat of
petroleum jelly to the square ring (20) and place on body
(19). Place motor assembly on body (19), being careful
not to damage square rings (20). Place washers (9) and
nuts (21) on studs (22) and tighten. Screw radial cutter
(23) on shaft clockwise. Hold motor shaft stationary with
screwdriver and tighten. Then replace washer (25) and
screw (26). Radial cutter (23) to be fl ush with shredding
ring (16) on suction side to within ± .020.
E-3) OUTER SHAFT SEAL SERVICE:
CAUTION ! - handle seal parts with extreme
care. DO NOT scratch or mar lapped
surfaces.
E-3.1) Disassembly and Inspection:
Outer Seal -
To expose shaft seal (12) for examination
disassemble volute, cutter and impeller as outlined in
paragraph E-2.1. Drain oil from seal cavity as outlined
in paragraph E-1.3. To inspect seal further, remove
retaining ring (12d), spring (12c) and rotating member
(12b) from shaft (see Fig. 4). Examine all seal parts and
especially contact faces. Inspect seal for signs of wear
such as uneven wear pattern on stationary members,
chips and scratches on either seal face.
DO NOT
interchange seal components, replace the entire shaft
seal (12). If replacing seal, remove stationary (12a) by
prying out with fl at screw driver.
FIGURE 3
10 PSI
AIR
Remove Plug
Pressure Gauge Assy.
(See Parts List)
Summary of Contents for DGV2042
Page 12: ...12 FIGURE 8 ...
Page 13: ...13 FIGURE 9 ...
