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Chapter 19 to 21

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19. Water discharge from pump interconnected to pump

1) Connect 2nd pump to 1st pump, run 1st pump first to deliver water, and read static pressure on vacuum meter of 2nd pump. At this time, avoid that the pointer of the vacuum meter swings over the scale range due to excessive static pressure.
2) Run second pump to discharge water. During water discharging, be sure that the vacuum meter on second pump always reads over 0.05 Mpa and that on first pump always reads over 0.03MPa.
If pressure is below these values, increase the speed of the 1st pump, lower the speed of the 2nd pump, or replace nozzle with one of small spout bore to keep pressure over specified levels.
3) To stop pumps, be sure to stop 2nd pump first, then 1st pump.

20. Pump operation procedure

1) In case of twin water discharge, replace nozzles with smaller spout bore; otherwise, discharge pressure will drop or the discharge flow will be increased excessively, leading to engine trouble.
2) Nozzle spout bore in case of twin water discharge can be determined by the following equation, based on nozzle spout bore in case of single water discharge.

21. Water discharge from pump interconnected to pump

1. Preparation for starting:
  1) Check if fuel is good quality (volatility).
  2) Check if fuel and engine oil are mixed correctly.
  3) Check if metal parts are greased sufficiently.
  4) Check if fixing screws are not loosened.
  5) Check if engine oil is fed up the specified level in governor chamber.
  6) Check if engine oil is sufficiently supplied to vacuum pump.
  7) Check if vacuum pump can be easily turned manually.
  8) Check if spark plug is sound.
  9) Check if cocks are open or closed adequately.
  10) Check if water suction pipe is tightened properly and submerged in water.
  11) Check if length of discharge pipe and selection of nozzle are adequate.
2. Starting:
  12) Check fuel in carburetor for overflow after opening cock on fuel tank.
  13) Close carburetor choke, or half-open or full-open depending engine condition.
  14) Turn the main switch to START position, and release the main switch immediately after engine starts. For manual starting, engage the starter ratchet by pulling starter rope slowly toward you. When you feel ratchet engage, pull rope sharply (holding fire pump in place with your foot).
  15) Run vacuum pump for priming by shifting lever.
  16) If water flows continuously out from delivery pipe of vacuum pump, open water discharge valve slightly to release air from inside of pump, close discharge valve after confirming that cooling water circulates, and shift vacuum pump lever to original position.
  17) Open water discharge valve, then set required discharge pressure (discharge volume) by throttling while monitoring pressure gauge.
3. Operating precautions:
  18) Check if engine is cooled sufficiently. (Check flow of cooling water or operation of cooling water circulation controller.)
  19) Avoid no-load operation whenever possible – especially, water-cooled type.
  20) Check vacuum gauge and pressure gauge for abnormality.
  21) Check noise. Stop pump immediately if you hear noise.
  22) To stop pump, reduce speed to low (low pressure), close discharge valve, and shift main switch to STOP position.
4. Care after stopping:
  23) Completely drain water from pump and engine. In particular, in freezing season, take proper measure against freezing after use. Perform idling (for water drainage) and vacuum test (for leakage check).
  24) Be sure to charge battery.
  25) For long-term storage, it is recommended to apply a small amount of engine oil in cylinder for lubrication, and manually rotate shaft a few turns.
  26) Do not store pump in place with high humidity. Pay particular attention to care in rainy season.


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【参】BSI-EN:フッターナビ