Hamilton Jet HJ241, Manual

Page: 25 / 202

2.3
2 SYSTEM OPERATION
2.3 S
TEERING
HJ-241 / HSRX
This means that going astern the vessel has the
opposite steering to a motor car, a feature which
can be used to advantage when manoeuvring.
The following steering systems are suitable for this
application:
a) A manual hydraulic steering system which
gives approximately 1.3 turns of the helm
from full lock to full lock is recommended. (A
greater number of turns will reduce sensitivity
of steering during low speed manoeuvring).
b) A high quality rotary, or rack and pinion,
cable system is an alternative but for single
jets only - the system must not allow more
than 1.5 turns of the helm from full lock to full
lock.
The Steering System is balanced so that power
assisted controls are not necessary even for multiple
Jet Units.
2.3.1 Total Hydraulic Failure
EMERGENCY STEERING:— In the case of a complete
failure of the Helm Wheel or the cable parts of the
Steering System, the Jet may be steered by manually
moving the Jet Tiller:
Disconnect the cable from the Steering Arm (Refer to
Drawing
HJ-241-06-000 Steering Assembly General
Arrangment Sht1 & sht2 .
Move the Steering Arm by hand as required to move
the Steering Nozzle. Steering may only be possible
at low RPM, unless an emergency Steering Arm
Extension is used (Not included in CWF Hamilton
standard supply).
EMERGENCY MANUAL REVERSE DUCT
CONTROL:—
The Reverse Duct can be raised
manually and is only necessary if the hydraulic
Pump has failed.
T
O RAISE THE
R
EVERSE
D
UCT
:
1. Attach a rope to the Reverse Duct.
2. Take the weight of the Reverse Duct.
3. Lift the Reverse Duct and tie off the rope so that
the Reverse Duct is in the raised position and out
of the jet stream.
This will enable the vessel to proceed at speed and
return to base to have the fault checked and
rectified.
EMERGENCY MANOEUVERING AND DOCKING:—
1. With a Single Jet Unit. The vessel can be partially
manoeuvred by raising the Reverse Duct using a
rope and lowering the Reverse Duct under its
own weight. The engine must be kept at idle.
2. With Multiple Jet Units. Shut down the engine
that is driving the Jet with the faulty Reverse
System and manoeuvre using the other Jet(s).