Publicité
Les langues disponibles
Les langues disponibles
3.3 Removal of impeller
Single impeller models:
Pump impeller is screwed clockwise onto the engine
shaft. The impeller assembly is fixed together by
a setscrew. It can be disassembled in two halves
by removing the setscrew. This practice allows
the impeller to be cleaned without disrupting the
mechanical seal and potentially creating additional
service replacements.
Alternatively, the entire impeller assembly can be
removed. To remove the entire impeller assembly,
unscrew locking setscrew, or impeller/s anti-clockwise
using a socket in eye of impeller. If difficult to remove,
lock engine crankshaft at recoil starter end.
Twin impeller models:
Second stage pump impeller is screwed clockwise
onto the engine shaft. The complete impellers'
assembly is fixed together by a single setscrew. The
impellers can be disassembled in two halves by:
• unscrew locking setscrew;
• remove first impeller front and rear
• remove diffusers; and
• remove second impeller's front half.
This practice allows the impellers to be cleaned
without disrupting the mechanical seal and
potentially creating additional service replacements.
Alternatively, the entire impeller assemblies can be
removed. To remove the entire impeller assembly:
• unscrew locking setscrew;
• remove first impeller front and rear
• remove diffusers; and
• remove second impeller anti-clockwise using a
socket in eye of impeller. If difficult to remove,
lock engine crankshaft at recoil starter end.
3.4 Avoiding pump damage
IMPORTANT: Pumping water containing
sand, dirt or other abrasive materials
will result in accelerated pump wear
and seal failure. Damage of this kind
is not covered by warranty. Pumping
water containing chemicals, or high
concentrations of salt may damage
Firefighter pump components. If the
Firefighter pump is used for this kind
of service, life will be extended by
always washing thoroughly with clean
water after use. However, Davey cannot
accept responsibility for damage
caused by chemicals, salt or corrosive
fluids. Pumping hydrocarbon-based
liquids, even in diluted form, is likely to
cause damage to internal components
and such failure is not covered by
warranty. Davey ensure their Firefighter
pumps and the engines fitted to them
are matched. This is confirmed by
engine manufacturers by programs
such as the Honda's engine matching
test and approvals program.
3.5 Storage
IMPORTANT: The Firefighter pump should
be drained of water and normal engine
storage procedure should be followed.
(Run the engine until fuel is exhausted,
drain and fill sump with fresh oil). The
Firefighter pump should be stored in a dry
place. Before starting pump after storage,
it should be checked to make sure that it
is free to rotate by pulling engine starter
recoil with ignition off. Ensure water
is drained from the Firefighter if being
stored in freezing conditions.
3.6 Fuel: petrol
Modern petrol engines very seldom actually have
starting or running problems due to fuel vaporizing.
The usual fuel related problem is due to old fuel.
Most people are unaware that petrol has a limited
life. It loses its volatility, or put simply, it goes "stale".
This may mean that if you have a petrol driven
pump unit fully fueled and ready to go in September,
by December it may not start. There are some
important procedures to follow to ensure your petrol
engine is ready to start and operates correctly:
• Change your fuel every two months. While in perfect
conditions the shelf life should be at least three
months, are you prepared to take the chance?
Changing the fuel over can be by usage or by
draining the fuel from the engine. It also applies to
fuel you have stored, even in approved containers;
• Use a fuel stabiliser to extend the storage life of the
fuel. Honda offers fuel additives, or stabilisers which
dramatically extend the shelf life of petrol. These
additives must be added at the time of purchase of
the fuel. They will NOT renew already stale fuel.
3.7 Fuel: diesel
While diesel fuel has a longer shelf life, it is still
limited. BP Australia recommends that under normal
storage conditions, diesel fuel can be expected to
stay in a useable condition for:
• 12 months or longer at an ambient of 20ºC;
• 6-12 months at an ambient temperature higher
than 30ºC.
Keeping stored diesel fuel at lower temperatures in
containers free of air and water, and out of contact
with zinc or copper (or alloys including them) can
help extend the storage time. The main problem is
the settling of sediments and gums, which in the
case of small diesel engines can be a very serious
issue and can cause major harm to the engine.
Another very important thing to remember with
diesel fuel is cleanliness. Dirt in the fuel can do
serious damage to the fuel injection pumps, and in
prolonged situations can lead to complete engine
failure. Correct fuel filtration on the engine's fuel
tank is absolutely critical.
6
Publicité
