Gorman-Rupp Pumps T10A3S-B /FM,/WW - Manual (Page 28)

OM-05290 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 7
NOTE
An alternate method of removing the check valve
assembly is to remove the hardware securing the
valve body (4) to the suction piping. Discoonnect
the shoulder‐type coupling (11) and separate the
valve body (4) and check valve from the suction
head. Separate the check valve from the valve body
as described above.
Replace the cleanout cover gasket (12) before re­
installing the cover.
Suction Head And Wear Plate Removal
(Figure E‐1)
To remove the suction head, support it with a suit­
able hoist and sling and remove the hardware (42,
43, 44 and 45) securing it to the pump casing. Re­
move the suction head gasket (40).
To remove the wear plate (38), position a wood or
soft metal wedge between the impeller vanes and
the wear plate, and tap the wedge with a hammer.
Turn the impeller every 45
_, repeating the process
until the wear plate is “walked” out of the pump
casing.
NOTE
If the pump is to be completely disassembled, the
wear plate can also be easily removed after remov­
ing the rotating assembly (2). Use a suitably sized
piece of wood to tap the wear plate out of the casing
through the rotating assembly opening.
Rotating Assembly Removal
(Figure E‐2)
The rotating assembly (2, Figure 1) may be re­
moved from either side of the casing; however, it is
recommended that it be removed through the suc­
tion head opening.
The impeller (1) should be loosened while the rotat­
ing assembly is still secured to the pump casing.
Before loosening the impeller, remove the seal cav­
ity drain plug (31A) and drain the seal lubricant.
This will prevent the oil in the seal cavity from es­
caping as the impeller is loosened. Clean and rein­
stall the seal cavity drain plug.
Immobilize the impeller by wedging a block of
wood between the vanes, and remove the impeller
capscrew and washer (27 and 28). Install a lathe
dog on the drive end of the shaft (18) with the “V”
notch positioned over the shaft keyway.
With the impeller rotation still blocked, strike the
lathe dog sharply in a counterclockwise direction
(when facing the drive end of the shaft). The impel­
ler may also be loosened by using a long piece of
heavy bar stock to pry against the arm of the lathe
dog in a counterclockwise direction (when facing
the drive end of the shaft) as shown in Figure E-3.
Use caution not to damage the shaft or keyway.
When the impeller breaks loose, remove the lathe
dog and wood block and unscrew the impeller
from the shaft.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure E‐3. Loosening Impeller
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (34)
off the impeller shaft. Tie and tag the shims, or
measure and record their thickness for ease of
reassembly.
(Figure E‐1)
An optional disassembly tool for removing and in­
stalling the rotating assembly is available from the
factory. If improvised tools are used, be sure they
are heavy enough for safe use and will not damage
the pump.
Remove the inner hardware (25 and 26) from the
casing ring (22). If the removal tool is used, follow
the instructions packaged with it, and pull the rotat­
ing assembly from the pump casing (see Figure