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Mid-Mount Ascendant Aerial Tower / 5-5
MAINTENANCE
Emergency Hydraulic Power Unit
(EPU) not working.
No power.
Check for battery power and that the
Aerial Master power switch in cab is
“ON”.
Emergency Stop (E-STOP)
message exists.
Check all Emergency Stop switches.
They must be in the “UP” position or
the aerial electronics will not
function. To reset, twist the
Emergency Stop switch button.
Aerial is not in proper setup position. Check for proper setup conditions:
ladder properly stowed for stabilizer
operation and stabilizers properly
set for aerial operation.
If the above have been verified and
the problem still exists:
Have one operator hold the override
switch while the other operator uses
the EPU switch to operate functions.
As a last resort, if the EPU switch still
does not operate the functions:
Aerial Functions: Hold the EPU
switch in the UP position at the
manual stabilizer control station
while the operator at the turntable
uses the manual aerial controls.
Stabilizer Functions: Hold the EPU
switch in the DOWN position a the
manual stabilizer control station
while operating the manual stabilizer
controls.
Table 5-1: Troubleshooting Guide (Continued)
Problem
Probable Cause
Solution