Gorman-Rupp Pumps T3A71S-B /F,/FM - Manual (Page 36)

OM-05349 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 14
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
(Figure 1 and 8)
If the wear plate (12) was removed for replace­
ment, carefully center it on the back cover and se­
cure it with the hardware (14 and 15). The wear
plate must be concentric to prevent binding when
the back cover is installed.
Clearance between the impeller and wear plate is
adjusted using four adjusting screws and locking
collars (29 and 30). There are 18 detents on the I.D.
of each locking collar. Indexing the collars one det­
ent 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 O‐rings (13 and 17), and
lubricate them with a generous amount of No. 2
grease. Clean any scale or debris from the contact­
ing surfaces in the pump casing that might inter­
fere 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 8. Installing and Adjusting Back Cover
Screw the four adjusting screws (30) 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 (32) and
slide it into the pump casing. Use two back cover
nuts (31) on diagonally opposing studs to press
the back cover into the pump casing until the wear