OM-06114
VGH SERIES
MAINTENANCE & REPAIR
PAGE E - 5
Disconnect the bypass pipe (8) at the couplings (5)
in the pump casing and seal flange (37).
Remove the hardware securing the pump casing
to the base. Wedge a block of wood under the
bearing housing (15) to support the housing when
the casing is removed.
Remove the hex nuts (7) and separate the pump
casing from the seal plate. Tie and tag any leveling
shims used under the casing mounting feet. Re
move the seal plate gasket (41) and clean the mat
ing surfaces.
Immobilize the impeller shaft (22). Remove the im
peller hardware (45, 46, 47 and 50). Using a soft‐
faced mallet, tap the impeller from the shaft. Retain
the impeller key (51). Inspect the impeller and re
place it if cracked or badly worn.
Wear Ring Removal
Inspect the wear rings (42 and 44) for excessive
wear or scoring. The wear ring (41) is secured in
the seal plate by the set screw (53) and a press fit. If
replacement is required, remove the set screw. Us
ing a small bit, drill two holes through each of the
wear rings horizontally, 180
_
apart. Use a chisel or
other suitable tool to complete the cuts through the
wear rings, and remove them.
Use caution
not to
damage the pump casing or seal plate when re
moving the wear rings.
Seal Removal
(Figures 1 and 2)
To remove the seal assembly (3), remove the nuts
(10 and 35) securing the seal plate (39) to the bear
ing housing (15) and seal flange (37). Slide the seal
plate and gasket (38) off the shaft (22).
Loosen the set screw (54) securing the shaft sleeve
(57) to the shaft. Slide the sleeve, seal assembly
and seal flange off the shaft as a unit.
Slide the shaft sleeve and rotating portion of the
seal out of the seal flange. Remove the O‐ring (40)
from the groove in the I.D. of the sleeve. Lubricate
the shaft sleeve with light oil and work it up under
the rubber bellows. Slide the rotating portion of the
seal off the shaft sleeve.
Unscrew the pin (11) and press the stationary seal
seat and O‐ring out of the seal flange.
If no further disassembly is required, see
Seal
Installation.
Shaft and Bearing Removal And Disassembly
When the pump is properly operated and main
tained, the bearing housing should not require dis
assembly. Disassemble the shaft and bearings
only
when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly‐
equipped shop by qualified personnel.
Remove the shaft key (56).
Remove the hardware (27 and 28) securing the
foot (29) to the base, and move the bearing hous
ing to a clean, well‐equipped shop for disassem
bly.
Remove the constant level oiler (18) from the bear
ing housing. Remove the drain plug (28) and drain
the oil from the bearing housing. Clean and rein
stall the drain plug.
Disengage the hardware (14 and 20) and remove
the inboard and outboard bearing covers (25 and
34) and gaskets (26 and 33). Inspect the oil seals
(23 and 32) and, if replacement is required, use a
screwdriver or other suitable tool to pry them from
the bearing covers.
Place a block of wood against the impeller end of
the shaft and tap the shaft and assembled bearing
(19) out of the bearing housing.
The inner ring for the roller bearing (31) will be re
moved with the shaft, while the outer ring and roll
ers will remain in the bearing housing. Press the
outer ring and rollers out of the bearing housing
from the back side. There are puller notches on the
back side of the inner ring. Use a suitable puller to
remove the inner ring from the shaft.
Remove the snap ring (24) and outboard bearing
spacer (21). Use a bearing puller to remove the
