OM--01930--03
T SERIES
MAINTENANCE & REPAIR
PAGE E -- 14
using the installation tool.
Be careful
not to dam-
age the O-rings.
Secure the pump casing ring (14) to the rotating
assembly with the inner hardware (17 and 18).
NOTE
The inner capscrews are 1/4 inch (3,2 mm) shorter
than the outer capscrews.
Install an equal thickness of rotating assembly
shims (13) under the pump casing ring, and secure
the ring to the pump casing with the outer hard-
ware (15 and 16).
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 an equal
amount of shims from each rotating assembly
shim set until the impeller scrapes against the wear
plate when the shaft is turned by hand.
Preload
the shaft in the direction of the impeller when
checking this clearance.
After the impeller
scrapes, add approximately .010 inch (0,25 mm) of
shims to each shim set.
NOTE
An alternate method of adjusting this clearance is to
reach through the suction port with a feeler gauge
and measure the gap. Add or subtract rotating as-
sembly shims accordingly.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve (42), 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 (41). Align
the adaptor with the flange hole, and secure the as-
sembly with the check valve pin (3).
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
(Figure 1)
If the wear plate (22) was removed for replace-
ment, carefully center the new wear plate on the
back cover and secure it with the hardware (37 and
38). The wear plate
must
be concentric to prevent
binding when the back cover is installed.
Replace the back cover O-ring (30), and lubricate it
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. Slide the back cover as-
sembly into the pump casing. Be sure the wear
plate does not bind against the impeller.
NOTE
To ease future disassembly, apply a film of grease
or ‘Never-Seez’ on the back cover shoulder, or any
surface which contacts the pump casing. This ac-
tion will reduce rust and scale build-up.
Secure the back cover assembly by tightening the
hand nuts (35) evenly.
Do not
over-tighten the
hand nuts; they should be just tight enough to en-
sure a good seal at the back cover shoulder. Be
sure the wear plate does not bind against the cas-
ing.
PRESSURE RELIEF VALVE
MAINTENANCE
(Figure 1)
The back cover is equipped with a pressure relief
valve (27) to provide additional safety for the pump
and operator (refer to
Liquid Temperature And
Overheating
in
OPERATION
).
