JLG LSS Scissors User Manual
SECTION 5 - SERVICE - (LE, MRT, RTS, ES, RT)
– JLG Lift –
Table 5-3. LSS Troubleshooting Chart - Measurement Performance
Empty Platform Weight (DIAG-
NOSTICS, PLTLOAD) is not
within +15lbs (±7kg) of zero.
Platform Load readings (DIAG-
NOTICS, PLTLOAD) are unsta-
ble by more than +2lbs (±1kg)
(without the influence of vibra-
tion or wind).
There are large variations in
Platform Load (DIAGNOS-
TICS, PLTLOAD) based on the
location of the load. Tolerance
to variations is 40lbs (18kg) for
an evaluation using the techni-
cian’s weight, and +5% of
Rated Load when using cali-
The LSS Module is unable to properly measure the platform weight.
1. One of the Shear Pin Load Cells is not properly plugged into the LSS Module. Since
the connectors seal with an O-ring and are located in a crowded area, it is possible
that the connectors are threaded together, but poor electrical contact is made.
Attempt to wiggle the molded portion of each connector on J5-J8. If properly tight-
ened, the molded portion should not move. Also, examined each Shear Pin Load
Cell’s readings via the JLG Analyzer. Proceed to the DIAGNOSTICS, CELL 1-4, LOAD
displays and determine if the readings are reasonable. Note that it is possible to have
only two sensors carrying all of the platform load due to fit between the platform and
support structure (this is normal).
2. Wiring leading to one of the Shear Pin Load Cells is damaged. Examine each sen-
sor’s reading using the JLG Analyzer. Proceed to the DIAGNOSTICS, CELL 1-4,
LOAD displays and determine if the readings are reasonable and responsive to slight
downward pressure above the sensor being viewed. Carefully inspect sensor wiring
where it passes through cable clamps for signs of damage. Inspect wiring where
damage to the channel is apparent. If damage to the sensor’s cordset is found,
replace the appropriate Shear Pin Load Cell since the cordset is not serviceable
(connector is molded for moisture resistance; cordset is soldered into sensor
beneath welded stainless steel cover). If damage to the sensors extension cordset is
found, unplug both ends and fit a replacement.
3. One of the Shear Pin Load Cells was not assembled properly during installation.
Examine each sensor’s reading using the JLG Analyzer. Proceed to the DIAGNOS-
TICS, CELL 1-4, LOAD displays and determine if the readings are reasonable. It is
often helpful to apply slight downward pressure above the sensor being examined
and observe that its output increases (increasing force measurement; decreasing
means the sensor is mounted upside-down). Compare the order of assembly to the
detail on the Installation Drawing and ensure that the only contact between the plat-
form and the support is through the sensor bodies (nothing else touches except
wires). Re-assemble according to print if necessary.