Gorman-Rupp Pumps 810A2-4045T 1529947 and up - Manual (Page 33)

OM-06543 80 SERIES
MAINTENANCE & REPAIR PAGE E - 13
This seal is not designed for operation at
temperatures above 110
_F (43_C). Do not
use at higher operating temperatures.
Inspect the seal plate, seal liner and the impeller
shaft for burrs or sharp corners, and remove any
that exist. Replace the seal liner (38) if wear or
grooves exist which could cause leakage or dam­
age to the seal packing rings.
To replace the seal liner, position the seal plate on
the bed of an arbor (or hydraulic) press and use a
new seal liner to press the old liner out. After the
new liner is properly installed, a 1/4‐inch diameter
(6,35 mm) hole must be drilled through it to permit
the flow of lubricant to the seal assembly. Be care­
ful to center the drill in the threaded hole so not to
damage the threads in the pump casing. Deburr
the hole from the inside of the seal liner after dril­
ling.
Position the seal plate on the impeller shaft and se­
cure temporarily with two capscrews.
Slide the inboard rotating element onto the shaft
until the chamfered side seats against the shaft
shoulder.
Subassemble the inboard stationary seat, packing
ring and spring washer. Press this subassembly
into the lubricated seal liner. A push tube cut from a
length of plastic pipe would aid this installation.
The O.D. of the pipe should be approximately the
same diameter as the O.D. of the seal spring.
Install the spacer sleeve and spring.
Subassemble the outboard stationary seat, pack­
ing ring and spring washer. Press this subassem­
bly into the lubricated seal liner.
Install the outboard rotating element with the
chamfered side facing the impeller.
Reinstall the automatic grease cup and piping (15,
16 and 17) in the seal plate. After the impeller has
been installed, lubricate the seal as indicated in
LUBRICATION.
Impeller Installation
(Figure 3)
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (4) as previously removed and screw the im­
peller onto the shaft until tight.
A clearance of .020 to .040 inch (0,51 to 1,02 mm)
between the impeller and the seal plate is recom­
mended for maximum pump efficiency. Measure
this clearance and add or subtract impeller shims
until it is reached.
NOTE
The seal plate must be tight against the intermedi­
ate while setting the back impeller clearance.
Pump Reassembly
(Figure 3)
If the wear plate (41) was removed for replace­
ment, install the O‐ring (40) in the replacement
wear plate. Secure the wear plate to the pump cas­
ing with the hardware (43 and 44) at this time.
Remove the two capscrews temporarily securing
the seal plate and install the same thickness of
pump casing gaskets (12) as previously removed.
Secure the pump casing to the intermediate with
the nuts (14).
A clearance of .010 to .020 inch (0,25 to 0,51 mm)
between the impeller and the wear plate is also rec­
ommended for maximum pump efficiency. This
clearance can be obtained by removing gaskets
from the casing gasket set until the impeller binds
against the wear plate when the shaft is turned. Af­
ter the impeller binds, add .015 inch (0,38 mm) of
gaskets.
NOTE
An alternate method of adjusting this clearance is to
reach through the discharge port with a feeler
gauge and measure the gap. Add or subtract pump
casing gaskets accordingly.
Be sure to reinstall any leveling shims used under
the pump casing mounting feet and secure the