Diagnostics & Troubleshooting - JLG 600SC Service And Maintenance Manual

Diagnostics & Troubleshooting
If SkyGuard does not function when the sensor is engaged,
first verify the configuration under the 
MACHINE SETUP: SKYGUARD OPTION menu using the hand-
held Analyzer. Ensure the selected configuration matches the
actual system installed on the machine. If not, select the cor-
rect configuration, then verify operation.
Additionally, use the handheld analyzer to navigate to the
DIAGNOSTICS: FEATURES  SKYGUARD INPUTS menu to
determine additional SkyGuard fault information.
Engage the SkyGuard sensor and observe the Analyzer to
determine if the switch/relay closes.
If the status of the switch/relay remains OPEN while the Sky-
Guard sensor is actively engaged, it is possible the sensor has
failed and should be replaced immediately.
Drive Drive
Forward Reverse
C C
R = Indicates Reversal is Activated
C = Indicates Cutout is Activated
*DOS (Drive Orientation System) Enabled
**DOS Not Enabled, Machine is driving straight without steering, and any other hydraulic function is active
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Table 4-1. SkyGuard Function Table
Boom
Steer Swing
Lift Up Lift Down
C R R
If the status of the switch/relay remains CLOSED while the Sky-
Guard sensor is actively engaged, a power or ground wire may
not be making good contact or may be loose or broken. Addi-
tionally, there is a low probability that both relays may have
failed.
If the switch/relay status is in disagreement, then one may
have failed or is not installed correctly. In this case, the
machine will be inoperable.
FAULT CODES
Refer to Table 6-14 for more fault code information
• 0039 - SkyGuard switch activation fault
• 2563 - switch disagreement fault
Boom Boom Boom
Tele Out Tele In
R R C
SECTION 4 - BOOM & PLATFORM
Jib Basket Basket
Lift Level Rotate
C C C
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