Hamilton Jet HJ241, Manual

Page: 31 / 202

2.9
2 SYSTEM OPERATION
2.11 HSRX R
EVERSE
S
YSTEM
HJ-241 / HSRX
2.11 HSRX REVERSE SYSTEM
NOTE: T
HE FOLLOWING POINTS SHOULD BE NOTED
WHEN USING THE
HSRX R
EVERSE
S
YSTEM
.
1.The HSRX Reverse System does not have a
mechanical connection between the Reverse
Duct position and the Control Lever position.
The Control Lever can be positioned before
the Reverse Duct has reached the desired
position (unlike previous HSRC systems,
where the Control Lever followed the Reverse
Duct position).
2.The HSRX Reverse System has a bypass
feature. When the Control Lever is touching
the Stop Pin, the Reverse Duct will be in the
fully raised position and a Bypass Valve
opens. Oil is then passed directly to the Tank
rather than through the Back Pressure
Valve. The Pump will now operate at
considerably reduced pressure, which will
minimise power consumption and maximise
component life.
3.The By-Pass Port is only open when the
Reverse Duct is in the fully raised position.
At any position other than fully raised, the
Reverse System will operate at 500 psi back
pressure. The Maximum Shaft Speed for
Continuous Operation of the Reverse System,
at any position other than fully raised, is
1000 RPM.
4.There is no flow control in the HSRX Reverse
System. The effect of this is, the higher the
engine RPM, the faster the Reverse Duct will
move. In the "Crash Stop" situation, (Full
reverse at full speed) the Reverse can be
actuated almost instantly, causing a very
sudden and severe deceleration.
5.If a "Neutral Detent and Engine Start
Interlock" microswitch is fitted, refer to
drawing
CT-CLV-01-003 Reverse Control-
ler which is included with the Drawings
Package.
W
ARNING
Use of a Waterjet steered vessel is
different from a propeller driven
vessel as the waterjet mainshaft
must always be rotating whenever
steering thrust is required.
C
AUTION
If in lightweight planing craft, the
“Astern” or “Zero Speed” posi-
tions are selected with the throttle
left open and the boat moving for-
ward at speed, the resultant
“Braking Effect” can be very
severe - even more so than full
braking with a motor car.
C
AUTION
Never stop the engine(s), or
disengage the drive to the Jet Unit,
when approaching a mooring or at
any time when control of the
vessel may be required.
C
AUTION
If a problem is detected, return to
the mooring immediately, at
reduced power. DO NOT operate
the jet unit until the fault has been
repaired. refer to section 7 Fault
Finding.