Snorkel MB20-sn1000+ - Manual (Page 15)

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2. Operation & Specifications
The function of the mast straps is to ensure that masts descend in the correct order
and more importantly, that masts cannot continue to descend if the jib or platform
meets an external obstacle. Raise the masts about 30cm. Check the external mast
clamp screws for tightness. Pull on the short length of each strap and check that they
are secure. Refer to the maintenance manual for instructions on more stringent
periodic checks on these straps.
Check the Emergency Lowering feature of the mast. The lever is located in the upper
mast over. Open the left hand battery inspection hatch and locate the ‘Emergency
Lowering’ decal label. Check the wear pads for damage or heavy scoring. Replace as
necessary.
9. Elevate the jib fully. Using the Lower Control Station, turn the mast assembly through
about 90 degrees. Check the correct routing of the hoses and cables and the correct
smooth operation of the energy chain in its chassis base slide. Continue rotating
through 180 degrees in both directions. Confirm that the rotation stops are intact.
10. STANDARD PLATFORM CONTROLS Repeat the mast, jib and rotate functions from
the Upper Control Station in the platform. Check that pressing the emergency stop
button prevents subsequent operation of the joystick.
11. TILT SENSOR FUNCTION CHECK. The tilt sensor is incorporated in the EZ230
Figure 5: Joystick
12. MACHINE TRAVEL - UNELEVATED Travel functions are possible only from the
platform Upper Control Station. As with all such controls, the deadman handgrip switch
must be depressed before any function can operate.
Select Drive on the upper control panel. Pushing back and forward on the joystick
moves the machine backwards and forwards respectively.
The pothole protection will begin to retract immediately. However, full demand speed
will not be realised until the bars are fully raised. This takes about 3 seconds. Check
that the motion alarm DOES sound during travel. Check that the thumb operated
switches on the top of the joystick operates the front wheel steering.
13. MACHINE TRAVEL-ELEVATED While the masts are raised, it is possible to drive and
steer the machine at a much reduced speed. Also note that while the masts are raised,
the pothole protection bars should be fully extended and should remain extended
during slow speed motion of the machine.
control module. To check it’s operation while in platrom drive the machine onto a
suitable ramp to raise it’s tilt angle above 2 degrees, lift the Jib until the jib limit switch
just separates, a continuous audible alarm should sound and all functions on the
machine become disabled. Lower the jib using the emergency manual release valve
located between the jib structure, the alarm should silence and normal operation
becomes enabled.
Joystick
with Deadman Grip
C A U T I O N ! !
During manual lowering extreme care must be taken to ensure hands
are not trapped in the jib structure.