Gorman-Rupp Pumps T2A3-B /F,/FM,/WW - Manual (Page 30)

OM-05136 T SERIES
MAINTENANCE & REPAIR PAGE E - 7
Suction Check Valve Removal
(Figure 1)
If the check valve assembly (36) is to be serviced,
remove the hardware (3 and 4), and remove the
check valve cover (2). Pull the complete assembly
from the pump casing (1).
NOTE
Further disassembly of the check valve is not re­
quired since it must be replaced as a complete unit.
Individual parts are not sold separately.
Rotating Assembly Removal
(Figure 2)
The rotating assembly may be serviced without
disconnecting the suction or discharge piping;
however, the power source must be removed to
provide clearance.
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 (21) and drain the seal lubricant. This
will prevent the oil in the seal cavity from escaping
when the impeller is loosened. Clean and reinstall
the seal cavity drain plug.
Immobilize the impeller by wedging a block wood
between the vanes and the pump casing, and re­
move the impeller capscrew and washer (30 and
31).
Install the shaft key (17). Install a lathe dog on the
drive end of the shaft (16) with the “V” notch posi­
tioned over the shaft key.
With the impeller rotation still blocked, see Figure 3
and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock­
wise direction (when facing the drive end of the
shaft). Use caution not to damage the shaft or key­
way. When the impeller breaks loose, remove the
lathe dog, key and wood block.
NOTE
Do not remove the impeller until the rotating assem­
bly has been removed from the pump casing.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 3. Loosening Impeller
(Figure 1)
Remove the hardware (14 and 15) securing the ro­
tating assembly to the pump casing. Install two
3/8‐16 UNC x 2‐1/2 inch long capscrews (not sup­
plied) in the tapped holes in the bearing housing.
Use these jacking screws to remove the rotating
assembly from the pump casing. Tie and tag the
rotating assembly shims (16) or measure and re­
cord their thickness for ease of reassembly.
Remove the two jacking screws from the bearing
housing. Remove the bearing housing O‐ring (12).
Impeller Removal
(Figure 2)
With the rotating assembly removed from the
pump casing, unscrew the impeller from the shaft.
Use caution when unscrewing the impeller; ten­
sion on the shaft seal spring will be released as the
impeller is removed. Inspect the impeller and re­
place it if cracked or badly worn.
Remove the impeller adjusting shims (3); tie and
tag the shims, or measure and record their thick­
ness for ease of reassembly.
Seal Removal
(Figure 2)
Remove the seal spring.
Slide the shaft sleeve and rotating portion of the
seal off the shaft as a unit. Apply oil to the sleeve