JETStream TwinForce Series, Operation Manual

Page: 41 / 112

33
TwinForce™ Series Waterblast Unit
Pressure Controls
When the combined output of both pumps
is required, the pressure controls at the rear
of the trailer are used (Figure 43). There is a
bypass pressure control for both 15K Max and
20K Max pressure that allow pressure control
for the flow incoming from two hoses. Typically
when one pressure control is not used, it will
be plugged at the 3 ports on the WYE fitting.
When 40K is required, the output flow from
the pump nearest the tongue of the trailer will
travel to and pass thru the rear pump, and the
combined flow will exit the rear pump. A single
bypass valve fixed to either fluid end will con -
trol the pressure. If a bypass valve is on both
fluid ends, one should be completely closed.
15K and 20K water travels through 20K hard
pipe and hose (Blue) while 40K water travels
through separately plumbed 40K hard pipe
and hose (Orange).
Stopping the Unit
1. Open the bypass valve by turning coun-
ter-clockwise four full turns to relieve the
system pressure. Monitor the gauge to
ensure system pressure is at zero.
2. Decrease the engine speed to idle and
disengage the clutch by pulling the lever
towards the pump.
3. Allow the engine to operate for 4-5 min-
utes before stopping. This allows the
engine turbocharger to properly cool.
When the temperature shown on the
control panel decreases to approximately
176°F (80°C), it is safe to turn off the
engine.
4. Turn the key switch to the OFF position.
WARNING
! !
Do not idle the engine for more than 5 minutes.
Figure 43: Pressure Controls