Gorman-Rupp Pumps 16C20-F5L 1338868 and up - Manual (Page 30)

OM−02616 10 SERIES
MAINTENANCE & REPAIR PAGE E − 9
Turn
Counterclockwise
Lathe Dog Arm
V" Notch
Shaft Key
Impeller
Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 4. Loosening Impeller
Pump Casing Removal
(Figure 1)
To service the impeller or seal assembly, discon-
nect the suction and discharge piping. Remove the
hardware (48, 49, 50 and 51) securing the pump
casing (1) to the base (47).
(Figure 2)
Remove the nuts (16) securing the pump casing to
the seal plate (54). Install a standard 5/8-11 UNC
lifting eye in the tapped hole in the top of the pump
casing. Be sure to screw the eye into the casing
until fully engaged. Use a hoist and sling of suitable
capacity to separate the casing from the seal plate
and intermediate.
Do not attempt to lift the complete pump
unit using the lifting eye. It is designed
to facilitate removal or installation of in-
dividual components only. Additional
weight may result in damage to the
pump or failure of the eye bolt.
Remove the pump casing gaskets (55) and any
leveling shims used under the casing mounting
feet. Tie and tag the gaskets and shims for ease of
reassembly.
Impeller Removal
(Figure 2)
Before removing the impeller (2), drain the seal lu-
bricant by removing the seal drain plug (53). This
will prevent the oil from escaping when the impeller
is removed. Clean and reinstall the drain plug.
To remove the impeller (2), tap the vanes in coun-
terclockwise direction (when facing the impeller)
with a block of wood or soft-faced mallet. Be care-
ful not to damage the impeller. When the impeller
breaks loose, unscrew it from the shaft. Use cau-
tion when removing the impeller; tension on the
shaft seal spring will be released as the impeller is
unscrewed. Inspect the impeller and replace if
cracked or badly worn.
Slide the impeller adjusting shims (32) off the im-
peller shaft (47). Tie and tag the shims or measure
and record their thickness for ease of reassembly.
Seal Removal and Disassembly
(Figure 2)
To remove the seal assembly (3), remove the air
vent and piping (17, 18 and 19) and the bottle oiler
and piping (34, 35 and 36). Carefully remove the
spring holder and spring. Slide the shaft sleeve
(33) and rotating portion of the seal assembly off
the shaft as a single unit. Apply oil to the sleeve and
work it up under the rubber bellows. Slide the rotat-
ing portion of the seal off the sleeve.
Carefully slide the seal plate (54) and stationary
portion of the seal off the shaft as a unit. Use a suit-
able sized dowel to press the stationary portion of
the seal out of the seal plate from the back side.
Inspect the oil seal (22) and, if replacement is re-
quired, press it from the seal plate.
NOTE
The seal assembly may be removed without com-
pletely disassembling the pump by removing the
impeller through the back cover opening and using
a pair of stiff wires with hooked ends to pull the seal
parts out of the seal plate.
If no further disassembly is required, refer to Seal
Reassembly And Installation.