Revision
11
Figure 4-7. Automatic Throttle Control (ATC).
The ATC may be adjusted for any desired loaded engine speed, and locked in that
position so that each time the water jetting accessory is actuated, the engine speed will
increase to that preset value.
Set the ATC at the idle position at the start
of
each job, or when the water jet nozzle has
been changed. After the clutch is engaged, and the water jetting accessory valve trigger
is squeezed, adjust the ATC to produce the desired system pressure.
Engine speed is increased by turning the handle counterclockwise and decreased by
turning it clockwise. After the engine speed has been set to produce the desired
pressure, tighten the lock nut on the handle shaft.
J.
Engine oil pressure must be indicated on the gauge within
15
seconds after starting.
k.
When starting a cold engine, slowly increase the
enB;ine
speed (rpm) to provide adequate
lubrication to the bearmgs
and also allvw
tl1e
oil pressure to staDillzc by turmng me
throttle control. After the engine speed has been adjusted for proper pump pressure,
tighten the lock nut on the handle shaft.
Caution:
Do not idle the engine for excessively long periods
of
time. Idling more than
10
minutes can cause combustion chamber temperatures to drop so low that
fuel cannot burn completely. This
will allow carbon
to
clog the injector spray
holes
and
piston rings
and
can cause the valves
to
stick.
The throttle control should be adjusted to idle speed
at
the start
of
each job
or when a nozzle size has been changed.
© Copyright June, 2005 NLB Corporation
4-16
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