Gorman-Rupp Pumps VGH1 1/2C31-B 1379872 thru 1208714 - Manual (Page 31)

OM−06115 VGH SERIES
MAINTENANCE & REPAIR PAGE E − 9
Impeller and Pump Casing Installation
Inspect the impeller, and replace it if cracked or
badly worn. Install the impeller key (50) in the shaft
keyway. Align the impeller keyway with the key and
slide the impeller onto the shaft until fully seated.
NOTE
After the impeller has been properly positioned,
check for free rotation. Correct any scraping/bind-
ing before further reassembly.
When the impeller is properly positioned, install the
impeller nut (45). Secure the impeller nut with the
safety plate (50) and hardware (46 and 47).
Install the casing gasket (41). Slide the pump cas-
ing (1) over the impeller and secure it to the seal
plate with the nuts (7).
Reinstall the vent line (8).
NOTE
After the pump casing has been installed, check the
impeller for free rotation and correct any scraping
or binding.
Final Pump Assembly
Remove the wood block supporting the bearing
housing. Secure the pump and bearing housing
foot to the base with the previously removed hard-
ware. Be sure to reinstall any leveling shims used
under the pump mounting feet.
Be sure the pump and power source are securely
mounted to the base. Reinstall the shaft key (55)
and install the power source coupling.
Install the suction and discharge lines. Make cer-
tain that all piping connections are tight, properly
supported and secure. Open all the valves in the
suction and discharge lines.
Be sure the pump and power source have been
properly lubricated, see LUBRICATION.
Fill the pump casing with clean liquid. Refer to OP-
ERATION, Section C, before putting the pump
back into service.
LUBRICATION
Seal Assembly
The seal assembly is lubricated by the medium be-
ing pumped and no additional lubrication is re-
quired.
Bearings
The bearing housing was not lubricated when
shipped from the factory. To lubricate the bearing
cavity, fill the constant level oiler as shown in Figure
3, then close the oiler and allow the oil to drain into
the bearing cavity. Repeat this procedure until oil
no longer drains from the constant level oiler.
FILL ONLY
THROUGH
CONSTANT
LEVEL OILER
DO NOT FILL
THROUGH
VENT PLUG
Figure 3. Lubricating Bearing Cavity
Do not fill the bearing cavity through the vent plug
in the top of the housing. This will result in over-fill-
ing, and can cause leakage, excessive heat build-
up and/or premature bearing failure.
Check the oil level regularly through the constant
level oiler and add oil as required.
Under normal conditions, drain the bearing hous-
ing once each year and refill with clean oil. Change
the oil more frequently if the pump is operated con-
tinuously or installed in an environment with rapid
temperature change.
Monitor the condition of the bearing lubri-
cant regularly for evidence of rust or mois-
ture condensation. This is especially im-