MAINTENANCE
5-2 / Mid-Mount Ascendant Aerial Tower
© 2021 Pierce Manufacturing Inc. All Rights Reserved.
5-2.
Troubleshooting
The following outline represents operational difficulties that may arise during the deployment of the Pierce aerial. It
is not a comprehensive list meant to exhaust every possible malfunction of the equipment; rather it is a quick
checklist to allow operating personnel to ensure operator error is not preventing the safe deployment of the unit.
Any time that an override or manual control is used, ALL safety systems are overridden. The operator
must be absolutely sure that all safety operating parameters are being met.
The steps described in the following troubleshooting table should be performed only by personnel that
are trained in the safe operation of this device.
Do not manually rotate the aerial over the short-jacked side.
Table 5-1: Troubleshooting Guide
Problem
Probable Cause
Solution
Stabilizer Switches do not operate
the stabilizers.
Emergency Stop (E-STOP)
engaged.
Check the Command Zone
Information Center (CZIC) or
indicator light at the lower control
station to determine if Emergency
Stop (E-STOP) is engaged.
No power.
Check that the Aerial Master power
switch in cab is “ON”.
PTO not engaged.
Check in cab and verify PTO
engagement.
Little or no hydraulic pressure.
Check that there is 350 psi of
hydraulic pressure.
Ladder not bedded.
Verify that the ladder is completely
bedded.
If above have been verified and the
problem still exists:
Have one operator hold the override
switch while another operator
engages the stabilizer switches.
As a last resort, have one operator
use the manual stabilizer controls
while another operator watches the
stabilizer movement.