11
Notes:
1. If suction height is high, never open the water discharge valve acutely. Water sucked halfway drops and water
cannot be discharged sometimes. If cavitation occurs because of too high water suction level, set the throttle to a
speed as low as possible.
2. When running the vacuum pump with the water suction lever kept running, set the operating time for 30 seconds or
less.
3. The engine is cooled down by water introduced. If the engine is operated without water suction (no-load operation),
set the throttle to low speed and never operate the engine more than 2 minutes. This fire-fighting pump is equipped
with a safety device designed to stop the engine by detecting temperature rise in cooling water. This safety device
sometimes may not function regularly when the throttle is set to medium- or high-speed in no-load operation without
cooling water. Be sure to observe the instruction. (Refer to P. 12 "For Longer No-load Operation".)
4. The pump pressure required depends on the number of extended hoses, nozzle diameter, water feeding height,
two-line water discharge, etc. Set the pump pressure in response to the water discharge pressure at the nozzle.
5. Pay attention to a sudden swing of the nozzle, which may occur when water discharge pressure is too high or when
the water discharge valve is opened or closed acutely.
6. In relayed water discharge, start the master pump first, and stop the slave pump first.
Set the water feeding pressure of the master pump so that the compound pressure gauge of the slave pump in
operation will read 0.05 to 0.1 MPa (max. 0.6 MPa). The slave pump will not run if the compound pressure gauge
read 0 or below.
The water discharge pressure of the slave pump must be 1.5 MPa or less. If this limit is surpassed, the pressure
gauge or pump unit may be damaged.
7. As illustrated, mount a safety nozzle between joint and
water discharge valve in operation without pipe-end
nozzle (for example, suction from the water tank or
water feeding to a relay tank).
3. Temporary stop of water discharge
(1) When it is necessary to stop the pump provisionally for replacement of
a nozzle in water discharge or connection of hoses, turn the throttle to
"SLOW", and set the water discharge valve to "CLOSE".
(2) When stopping operation provisionally, with the water suction pipe kept
in operation, set the throttle to "SLOW", and stop the engine keeping
the water suction lever set to water discharge position. In this case,
water will not drop because of the check valve. Start up the engine and
open the water discharge valve. Then, water will be discharged.
(Re-start the engine within 3 minutes.)
4. Stop
(1) Turn the throttle fully to "SLOW" direction, and set the water discharge
valve to "CLOSE".
(2) Reset the main switch to "STOP" after a while, and the engine will stop.
(3) Set the fuel cock lever to "Close".
Note:
Never stop the engine at medium- or high-speed operation without
setting the throttle to "SLOW". There is a risk of after fire.
ATTENTION
Joint
Safety Nozzle
Packing
Mount to the water
discharge valve
Open
Close
Open
Close
Half open
