Lowering Alarm; Stabiliser Interlock Test; Stabiliser Locked Out When Platform Elevated; Elevation Locked Out When Axles Not Stowed - Snorkel S2255RT Operator's Manual

Chapter 7 – Prestart Inspection

Lowering Alarm

To test the lowering alarm from the lower controls:
1. Raise the platform approximately 10' (3 m).
2. Lower the platform and make sure the alarm sounds.

Stabiliser Interlock Test

Perform this test using the lower controls.
All Snorkel scissor lifts in the Snorkel 'SRT, SR and S/
RT Series are fi tted with a very important safety feature,
a 'Stabiliser/axle/scissor Interlock' system that prevents
the stabilisers being moved while the platform is elevat-
ed, and prevents the platform being raised if the rear
axle is oscillated and the stabilisers are not set or the
machine is tilted.
The correct operation of the Stabiliser/scissor Interlock
is critical to ensure that the Scissor is operated safely
and with minimum risk.
Danger
To ensure the interlock system is functioning cor-
rectly before operating the scissor the following test
must be carried out prior to operation each day, in
conjunction with all other relevant daily pre-oper-
ational checks:
Stabiliser locked out when platform is elevated test
1. Position the machine on a fi rm level surface.
2. From the platform controls, turn on the machine.
3. Raise the platform above the elevation switch.
4. Operate the right front stabiliser extend switch
while watching the stabiliser leg for movement
5. If the stabiliser legs moves, release the switch
immediately! Lower the platform fully, remove
the machine from service and fi x a Danger Tag
warning others that the machine is not to be
used. In the fi rst instance contact the owner who
will then contact the Snorkel branch or authorised
agent to inspect, repair and test the machine be-
fore allowing it to be placed back into service.
6. Lower the platform to the stowed position
Elevation locked out when axles not stowed test
7. Park the machine such that one rear wheel is in
a depression (approx 100mm deep) such that the
axle switch opens. A kerb or gutter may be suffi -
cient.
8. Raise the platform above the elevation point (ap-
prox 1.5 metres, depending on model).
9. At this point, an alarm will sound and further lift or
drive will be disabled.
10. If there is no alarm and/or the machine continues
30
to allow lift stop immediately! Lower the platform
fully, remove the machine from service and affi x
a Danger Tag warning others that the machine is
not to be used. In the fi rst instance contact the
Snorkel branch or authorised agent to inspect,
repair and test the machine before allowing it to
be placed back into service.
11. Repeat steps 7-10 for opposite rear wheel.
12. Lower the platform to the stowed position.

Elevation locked out when tilted test

1. Set the machine sideways on a surface of more
than 4 degrees and attempt to raise the stack.
The tilt sensors should alarm, and the machine
should not lift.
2. Repeat these steps with the machine facing fore
and aft. If the machine does lift, remove from op-
eration, then contact a qualifi ed service techni-
cian.
3. Set the machine on a surface of less than 4 de-
grees but more than tilt2 (refer to serial plate
under "slope sensor alarm setting side to side")
attempt to raise the stack to full height.
4. The machine should raise to the height recorded
on the serial plate then cut out and the tilt sensors
should alarm.
5. If the stack raises to full height, remove from op-
eration, then contact a qualifi ed service techni-
cian.
6. If all steps have been followed and the Stabilis-
er / Scissor interlock is functioning correctly, the
machine can now be used in accordance with the
operating instructions provided in the Operators
Manual.

Emergency Lowering System

Use the following procedure to test the emergency
lowering system:
Danger
Pinch points may exist between moving com-
ponents. Death or serious injury will result from
becoming trapped between components. Stand
clear of moving components while test operating
the machine.
1. Use the lower controls, fully raise the platform. Push
the emergency stop button inward.
2. The emergency lowering handle is mounted at the
rear of the aerial platform (refer to Figure 7.8).
S2255RT S2755RT - 15286-1