Mid Size & Full Size RTs
Engine Powered
Page 37
Section 2 - Familiarization
Procedures
It is the responsibility of the operator to read, completely understand and follow all instructions and warnings
contained in this operating manual and on the aerial platform.
2.6 Emergency Lowering Procedures
This section guides the operator on how to use the
emergency lowering system. This system allows
platform lowering in the event of an emergency or
malfunction.
Models 71xx & 88xx
WARNING
Keep clear of scissors mechanism when
using emergency lowering valve.
1.
Remove any obstructions to a descending
platform.
2.
Extension platform(s) may need to be retracted
or aerial platform may need to be moved to clear
obstructions. Refer to
Section 2.5
for winching and
towing procedures.
3
1
2
Figure 2-10. Emergency Lowering System
3.
Locate holding valve override knobs (item 1)
at base of each lift cylinder. Depress and turn
counterclockwise. If necessary, use emergency
lowering access rod (item 3) that is located on
aerial platform base or on top of fuel cabinet.
4.
On the hydraulic compartment, pull out and
hold emergency lowering valve (item 2) to lower
platform.
5.
To restore normal operation, depress and turn
holding valve override knobs clockwise.
Model 9250
WARNING
Keep clear of scissors mechanism when
using emergency lowering valve.
1.
Remove any obstructions to a descending
platform.
WARNING
Ensure platform and extensions including
railing are clear of obstructions before
operating emergency powered extension
platform retraction switch.
2.
Extension platform(s) may need to be retracted or
aerial platform may need to be moved to clear the
obstructions. Refer to
Section 2.5
winching and
towing procedures. Models 92xx are equipped
with emergency powered extension platform
retraction switch (located in the hydraulic/electrical
compartment) to retract the powered extension
platform from the base.
Figure 2-11. Emergency Powered Extension Platform
Retraction Switch
2
1
Figure 2-12. Emergency Lowering System
3.
In hydraulic compartment, depress and hold
emergency lowering pushbutton (item 1) to
activate the auxiliary lowering valves. Pull out
and hold the emergency lowering valve (item 2)
to lower platform. No further actions are required
to restore normal operation.
FAMILIARIZA
TION
FAMILIARIZA
TION
