Load Sensing System; Load Sensing System Overload Status - Skyjack SJ85 AJ Service Manual

Load Sensing System

5.3 Load Sensing System

5.3-1 Load Sensing System Overload Status

The platform load sensing system is a device that senses for an overload on the platform before the system disables
boom and drive functions. This system is active when the MEWP is powered on.
If the platform is overloaded while in work mode (the boom is raised greater than 15 degrees from horizontal or is
extended greater than 6 inches), the load sensing system will disable all normal functions and signal the operator
with an indicator light and an audible alarm.
If the platform is overloaded while in travel mode, the load sensing system will signal the operator with an indicator
light and an audible alarm, but will not disable any normal functions.
The following table shows the progression of warnings, indicated to the operator, up to the point of overload.
Mode/Condition
93-99% of platform capacity
Lowered Travel Position, ≥
100% of platform capacity
Elevated Travel Position, ≥
100% of platform capacity
Elevated Travel Position, ≥
100% of platform capacity
for Low Capacity Zone,
Boom extended or lowered
to Border between High and
Low Capacity Zones
WARNING
Do not operate the emergency power unit if the platform capacity is exceeded. If the platform is overloaded
due to contact with an overhead obstruction, do one of the following:
Remove the obstruction from the platform, then after a four-second delay normal functions can be
▪
resumed.
Use the emergency power unit at the base control console to release the platform from the
▪
obstruction.
WARNING
If the platform load sensing system is in fault mode (capacity zone lights flash alternately, overload light
flashes and capacity zone border light illuminates), do the following:
Ensure the platform is level and there are no obstructions contacting the platform.
▪
Shut the MEWP off using either the ignition switch or the e-stop. Restart the engine.
▪
If the platform load sensing system remains in fault mode, the emergency power unit may be used to lower
the platform from the base controls. Contact a qualified/competent person for repairs.
SJ85 AJ
Indicator Audible Drive
Light Alarm Functions
On Off Enabled
Flashing Pulsing Enabled
Flashing Pulsing Disabled
Flashing Off Disabled
Powered Boom
Emergency Power
Functions (Platform
(Platform)
or Base)
Enabled
Enabled
Disabled
Boom raise and
Boom retract only
Section 5 – Procedures
Emergency Power
(Base)
Enabled Enabled
Enabled Enabled
Enabled Enabled
Enabled Enabled
229044ADA
1256AA
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