11
SHURflo Operating Instructions, Performance,
Specifications and Parts Manual
Models NG7V, NG11V, NG7V-PH and NG11V-PH
Form L-4092 (3/10)
Figure 11 - Type A Motor Shaft Coupler
Figure 12 - Type B Motor Shaft Coupler
h. If drive coupler or motor need
replacing, see “Pump Motor or
Drive Coupler Replacement”
section on this page.
3. All pumps must be primed before
start-up and the seal chamber needs
to be filled (See Figure 2).
PRESSURE RELIEF VALVE
DISASSEMBLY AND REASSEMBLY
1. (Refer to Figure 13.) Remove thread-
ed cap (Ref. No. 31) and loosen lock
nut (Ref. No. 36) on pressure relief
valve adjustment screw (Ref. No. 32)
and rotate clockwise (CW) 1-2 turns
to pressure relief valve spring retain-
er (Ref. No. 29).
2. Unscrew and remove adjustment
screw (Ref. No. 32), locknut (Ref. No.
36) and fiber washer (Ref. No. 26) by
rotating counterclockwise (CCW).
3. Unscrew valve end cap (Ref. No. 30)
and o-ring (Ref. No. 37) by rotating
counterclockwise (CCW).
4. Remove valve piston (Ref. No. 28),
spring retainer (Ref. No. 29), valve
spring (Ref. No. 27), cover and/or valve
end cap and o-ring (Ref. No. 33), .
5. Unscrew pipe plug (Ref. No. 35) by
rotating counterclockwise (CCW).
Inspection of pressure relief valve
components should include piston for
wear and erosion, the spring and the
o-rings for degradation. Components
should be cleaned of accumulated build-
up of solid matter. The pressure relief
valve cover (Ref. No. 34) needs to be
inspected for wear on the piston
pressure relief valve seat, the cover face
and the bushing pockets. Replace any
parts if worn.
To reassemble, reverse the disassembly
steps above.
6. All pumps must be primed before
start-up and the seal chamber needs
to be filled (See Figure 2).
PUMP MOTOR OR DRIVE COUPLER
REPLACEMENT
1. The pump comes with a spline
coupler. The coupler could be of
two types. (See Figures 11 & 12 to
identify coupler type.)
2. Apply anti-seize compound to the
entire length of the motor shaft and
drive coupling spline teeth.
3. Align the keyways of motor shaft
and coupling, then install the key
(See Figures 10, 11 and 12). Slide the
drive coupling onto the motor shaft
as far as it will go.
4. Install the set screws into the
coupler and tighten the set screws
securing the coupler, key and motor
shaft together.
5. The coupling is now ready for final
pump motor assembly.
6. Make sure the splines are coated
with anti-seize compound or grease.
Slide the male spline shaft on the
pump head into the female spline
now mounted on the motor shaft.
7. Secure the pump to the motor with
four bolts.
8. The unit is ready for operation.
9. All pumps must be primed before
start-up and the seal chamber needs
to be filled (See Figure 2).The pump
head will pivot on the motor.
Do not run pump
dry, as permanent
damage to the pump gears, seal, and
bearings will result. Suction pressure should
never be greater than the discharge pressure.
Figure 10 - Installing the Spline Coupler
