Gorman-Rupp Pumps T4A65S-B /F,/FM - Manual (Page 35)

OM−05279 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E − 12
tainer until it slides onto the shaft and the seal faces
contact.
Install the seal spring, seal washer (29) and spring
centering washer.
Impeller Installation
(Figure 2)
Inspect the impeller, and replace it if cracked or
badly worn. Inspect the impeller and shaft threads
for dirt or damage, and clean or dress the threads
as required.
The shaft and impeller threads must be
completely clean before reinstalling the im-
peller. Even the slightest amount of dirt on
the threads can cause the impeller to seize
to the shaft, making future removal difficult
or impossible without damage to the im-
peller or shaft.
Install the same thickness of impeller adjusting
shims (30) as previously removed. Apply ‘Never-
Seez’ or equivalent to the shaft threads and screw
the impeller onto the shaft until tight.
NOTE
At the slightest sign of binding, immediately back
the impeller off, and check the threads for dirt. Do
not try to force the impeller onto the shaft.
A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is recom-
mended for maximum pump efficiency. Measure
this clearance, and add or remove impeller adjust-
ing shims as required.
NOTE
If the rotating assembly has been installed in the
pump casing, this clearance may be measured by
reaching through the priming port with a feeler
gauge.
NOTE
Proceed with Rotating Assembly Installation be-
fore installing the impeller capscrew and washer
(22 and 23). The rotating assembly must be in-
stalled in the pump casing in order to torque the im-
peller capscrew.
After the rotating assembly is installed in the pump
casing, coat the threads of the impeller capscrew
(23) with ‘Never-Seez’ or equivalent compound,
and install the impeller washer (22) and capscrew;
torque the capscrew to 90 ft. lbs. (1080 in. lbs. or
12,4 m. kg.).
Rotating Assembly Installation
(Figure 1)
Install the bearing housing and seal plate O-rings
(9 and 13) and lubricate them with light grease.
Ease the rotating assembly into the pump casing
using the installation tool. Be careful not to dam-
age the O-rings.
Install the same thickness of rotating assembly ad-
justing shims (12) as previously removed, and se-
cure the rotating assembly to the pump casing with
the hardware (10 and 11).
To set the impeller and wear plate clearance, refer
to the Back Cover Installation And Adjustment.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve assembly (40), and re-
place it if badly worn.
NOTE
The check valve assembly must be replaced as a
complete unit. Individual parts are not sold sepa-
rately.
Reach through the back cover opening with the
check valve (40), and position the check valve
adaptor in the mounting slot in the suction flange
(41). Align the adaptor with the flange hole, and se-
cure the assembly with the check valve pin (42).
NOTE
If the suction or discharge flanges were removed,
replace the respective gaskets, apply ‘Permatex
Aviation No. 3 Form-A-Gasket’ or equivalent com-
pound to the mating surfaces, and secure them to
the pump casing with the attaching hardware.