OM-05350
SUPER T SERIES
MAINTENANCE & REPAIR
PAGE E - 14
bly into the pump casing using the installation tool.
Be careful
not to damage the O‐ring.
Install the same thickness of rotating assembly ad
justing shims (32) as previously removed, and se
cure the rotating assembly to the pump casing with
the hardware (19 and 20).
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 (28) 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 (28) and position the check valve
adaptor in the mounting slot in the suction flange
(26). Align the adaptor with the flange hole and se
cure the assembly 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
(Figure 1 and 8)
If the wear plate (13) 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 (21 and 22). 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 (8A and 12A) 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 (22) 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 (24) and
slide it into the pump casing. Use two back cover
nuts (23) 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
locking screws align approximately with the holes
in the cover plate.
Loosen the back cover nuts used to press the back
cover into the pump casing one full turn.
Pull the collars off the adjusting screws, index them
three detents counterclockwise, and reinstall the
collars on the adjusting screws. Use the collars to
