Stabil-Trak™ Circuit Operation And Troubleshooting; Troubleshooting Symptom Chart - JLG sky trak mmv Service Manual

Stabil-TRAK™ System
11.4 STABIL-TRAK™ CIRCUIT OPERATION
AND TROUBLESHOOTING
The function of the Stabil-TRAK™ system varies under
different operating conditions. The basic modes include
the FREE PIVOT MODE, FINAL POSITIONING MODE,
and LOCKED MODE.
The hydraulic and electrical operation and troubleshooting in-
formation for each of these modes will be described on
the following pages.
11.4.1

Troubleshooting Symptom Chart

Symptom
With the boom below 40° when
swaying the frame to the right, the
left front tire comes off the ground.
With the boom below 40° when
swaying the frame to the left, the
right front tire comes off the
ground.
While traveling, ride feels spongy
(riding on 3 wheels).
Stabil-TRAK™ light in dash panel
is not ON.
11.6
Conditions
Ignition ON, engine running
Boom angle is below 40°
Travel select lever is in [F] FORWARD or
[R] REVERSE
Park brake OFF
Service brake DISENGAGED
Ignition ON, engine running
Boom angle is below 40°
Travel select lever is in [F] FORWARD or
[R] REVERSE
Park brake OFF
Service brake DISENGAGED
Ignition ON, engine running
Boom angle is above 40°
Travel select lever is in [F] FORWARD or
[R] REVERSE
Park brake OFF
Service brake DISENGAGED
Ignition ON, engine running
Boom angle is above 40°
Travel select lever is in [N] NEUTRAL, or
Park brake ON or Service brake
ENGAGED
Reference
Refer to Section 11.4.3, Hydraulic Circuit
Operation - Free Pivot Mode, Rod Oil Out
and Section 11.4.4, Hydraulic Trouble-
shooting - Free Pivot Mode, Rod Oil Out
or
Section 11.4.7, Electrical Schematic -
Free Pivot Mode and Section 11.4.8,
Electrical Troubleshooting - Free Pivot
Mode, Will Not Frame Sway Right
Refer to Section 11.4.5, Hydraulic Circuit
Operation - Free Pivot Mode, Base Oil Out
and Section 11.4.6, Hydraulic Trouble-
shooting - Free Pivot Mode, Base Oil Out
or
Section 11.4.7, Electrical Schematic -
Free Pivot Mode and Section 11.4.9,
Electrical Troubleshooting - Free Pivot
Mode, Will Not Frame Sway Left
Refer to Section 11.4.10, Hydraulic Cir-
cuit Operation - Final Positioning Mode,
Rod Oil Out and Section 11.4.11, Hy-
draulic Troubleshooting - Final Position-
ing Mode, Rod Oil Out
or
Section 11.4.12, Hydraulic Circuit Oper-
ation - Final Positioning Mode, Base Oil
Out and Section 11.4.13, Hydraulic Trou-
bleshooting - Final Positioning Mode,
Base Oil Out
or
Section 11.4.14, Electrical Schematic -
Final Positioning Mode and Section
11.4.15, Electrical Troubleshooting - Fi-
nal Positioning Mode
Refer to Section 11.4.21, Electrical
Schematic - Locked Mode and Section
11.4.22, Electrical Troubleshooting -
Locked Mode
Model MMV Rev. 12/04