MQD2H/3H DIAPHRAGM PUMP • OPERATION MANUAL — REV. # 8 (07/31/20) — PAGE 17
OPERATION
Figure 15. Choke Lever (Open)
8. Before the pump is placed in to operation, run the
engine for several minutes. Check for fuel leaks, and
noises that would associate with a lose component.
9. To begin pumping, place the throttle lever (See
Figure 16) in the
RUN
position. If water is not flowing
out of the discharge port, turn off the engine and check
for and clear any obstructions within the suction hose.
Figure 16. Throttle Lever (Run)
OPEN
CLOSE
CHOKE LEVER
THROTTLE
LEVER
RUN
IDLE
NOTICE
Pump speed can be regulated with the engine throttle
control from full. volume, 65 strokes per pinute, to about
40 strokes per minute for lesser volume seepage.
Smoothest operation can be determined by trying
to pump at several speeds. Limit maximum speed to
65 strokes per minute of the diaphragm (2,800 RPM
engine speed).
STOPPING THE ENGINE
Normal Shutdown
1. Move the throttle lever to the
IDLE
position
(See Figure 14) and run the engine for three minutes
at low speed.
Figure 17. Throttle Lever (Idle)
2. After the engine cools, turn the engine
ON/OFF
switch
to the
OFF
position (See Figure 15).
Figure 18. Engine ON/OFF Switch (OFF)
3. Place the fuel shut-off lever (See Figure 16) in the
OFF
position
Figure 19. Fuel Valve Lever (OFF)
Emergency Shutdown
1. Move the throttle lever quickly to the
IDLE
position, and
place the engine
ON/OFF
switch in the
OFF
position.
THROTTLE
LEVER
RUN
IDLE
ON
OFF
ENGINE SWITCH
FUEL VALVE
LEVER
ON
OFF
