Gorman-Rupp Pumps T6A60S-4045T 1443416 and up - Manual (Page 46)

OM-06183 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 19
therefore the pipe plug should never require remov­
al.
Install the bearing housing O‐ring (12A) and lubri­
cate it with light grease. Ease the rotating assem­
bly into the pump casing using the installation tool.
Be careful not to damage the O‐ring.
Install the rotating assembly adjusting shims (31)
using the same thickness as previously removed.
Secure the rotating assembly to the pump casing
with the hardware (9 and 10).
To set the impeller and wear plate clearance refer
to the Back Cover Installation And Adjustment.
Suction Check Valve Installation
(Figure 3)
Inspect the check valve assembly (31) and replace
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 and position the check valve adaptor
in the mounting slot in the suction flange (28). Align
the adaptor with the flange hole and secure the as­
sembly with the check valve pin (29).
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.
Back Cover Installation And Adjustment
(Figures 3 and 11)
If the wear plate (13) was removed for replace­
ment, carefully center it on the back cover and se­
cure it with the hardware (24 and 25). The wear
plate must be concentric to prevent binding when
the back cover is installed.
The clearance between the impeller and wear plate
is adjusted using four adjusting screws (19) and
locking collars (17). There are 18 detents on the
I.D. of each locking collar. Indexing the collars one
detent on the adjusting screws represents approxi­
mately .005 inch (0,13 mm) of wear plate clear­
ance. The recommended clearance between the
wear plate and the impeller is .010 to .020 inch
(0,25 to 0,50 mm).
Replace the back cover and wear plate O‐rings (12
and 15) and lubricate them with a generous
amount of No. 2 grease. Clean any scale or debris
from the contacting surfaces in the pump casing
that might interfere or prevent a good seal with the
back cover.
USE TWO
OPPOSING
BACK COVER NUTS
TO PRESS
BACK COVER
INTO PUMP
CASING USE TWO REMAINING
ADJUSTING SCREWS AND
LOCKING COLLARS TO
SET FACE CLEARANCE
INDEX COLLARS 3
DETENTS COUNTER‐
CLOCKWISE, THEN
TURN CLOCKWISE
UNTIL SCREW
HOLES ALIGN
Figure 11. Installing and Adjusting Back Cover
Screw the four adjusting screws (19) into the
tapped holes in the back cover plate until they are
just flush with the machined surface on the back
side of the cover plate.
Align the back cover plate over the studs (20) and
slide it into the pump casing. Use two back cover
nuts (21) on diagonally opposing studs to press
the back cover into the pump casing until the wear
plate just touches the impeller when the shaft is
turned by hand. Tighten the back cover nuts
evenly to avoid binding.
With the wear plate just touching the impeller, turn
the two free adjusting screws until they engage the
pump casing. Position the locking collars over the
adjusting screws so the holes in the collars for the