Gorman-Rupp Pumps 13A52-GX390 1371656 and up - Manual (Page 27)

OM−04730 10 SERIES
MAINTENANCE & REPAIR PAGE E − 9
clearance and add or remove impeller shims until
this clearance is reached.
Pump Casing Installation
(Figure 2)
Install the same thickness of pump casing gaskets
(8) as previously removed and secure the pump
casing to the intermediate with the nuts (10). Do
not fully tighten the nuts at this time.
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate is also rec-
ommended for maximum pump efficiency. Install
the back cover and set this clearance by adding or
removing gaskets in the pump casing gasket set
until the impeller scrapes against the wear plate
when the shaft is turned. After the impeller scrapes,
add .008 inch (0,20 mm) of gaskets.
After the face clearance has been set, tighten the
hardware securing the pump casing to the inter-
mediate.
Secure the pump casing to the rollover base (3,
Figure 1). with the previously removed hardware
(14, 15, 16 and 17, Figure 1). Be sure to reinstall
any leveling shims used under the mounting feet of
the pump casing.
Back Cover Installation
(Figure 2)
Inspect the wear plate (14) and replace it if badly
scored or worn. Install the wear plate on the back
cover, and secure it with the hardware (15 and 16).
Clean any scale or debris from the back cover
shoulder and pump casing which might prevent a
good seal.
NOTE
Apply a film of ‘Never-Seez’ or equivalent com-
pound on the back cover shoulder or any surface
which contacts the pump casing to ease future dis-
assembly and to reduce rust and scale build up.
Replace the back cover gasket (17) and slide the
back cover assembly (19) into the pump casing.
Be sure the wear plate does not bind against the
impeller.
Secure the back cover assembly with the cover
clamp bar (24) and cover clamp bar screw (25). Do
not over tighten the clamp bar screw; it should be
just tight enough to ensure a good seal at the back
cover shoulder.
Suction Check Valve Installation
(Figure 2)
Inspect the check valve components and replace
as required. Subassemble the check valve weights
(32 and 35) and check valve gasket (34) with the
hardware (31 and 33).
Position the check valve assembly (30) in the suc-
tion port with the large weight (35) facing toward
the inside of the pump casing. Install the suction
flange (28) and secure with the hardware (26 and
26). Check the operation of the check valve to en-
sure proper seating and free movement.
Final Pump Assembly
(Figure 1)
Be sure the pump and engine are securely
mounted to the base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.
Be sure the pump and engine have been properly
lubricated, see LUBRICATION.
Remove the fill plug assembly (5, Figure 2). Fill the
pump casing with clean liquid. Reinstall the fill plug
and tighten it.
Refer to OPERATION, Section C, before putting
the pump back into service.
LUBRICATION
Seal Assembly
(Figure 2)
The seal assembly is lubricated by the medium be-
ing pumped. No additional lubrication is required.
Engine
Consult the literature supplied with the engine, or
contact your local engine representative.