Service Manual

Stabil-TRAK™ System and Boom Interlock System
10.36
Model 8042, 10042, 10054 Legacy Rev. 10/03
10.12 STABIL-TRAK™ HYDRAULIC
CIRCUIT OPERATION AND
TROUBLESHOOTING
The function of the Stabil-TRAK™ system varies under
different operating conditions. The basic modes include
the FREE PIVOT MODE, SLOW PIVOT MODE and
LOCKED MODE.
The hydraulic operation and troubleshooting information for
each of these modes will be described on the following
pages.
10.12.1 Troubleshooting Symptom Chart
Symptom Conditions Reference
With the boom below 40°, when
swaying the frame to the right
, the left
front tire comes off the ground.
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
Refer to Section 10.12.3, “Hydraulic Circuit
Operation - FREE PIVOT Mode, Rod Oil
Out,” and Section 10.12.4, “Hydraulic
Troubleshooting - FREE PIVOT Mode,
Rod Oil Out.”
With the boom below 40°, when
swaying the frame to the left
, the right
front tire comes off the ground.
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
Refer to Section 10.12.5, “Hydraulic Circuit
Operation - FREE PIVOT Mode, Base Oil
Out,” and Section 10.12.6, “Hydraulic
Troubleshooting - FREE PIVOT Mode,
Base Oil Out.”
While traveling, ride feels spongy
(riding on 3 wheels).
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
Refer to Section 10.12.7, “Hydraulic
Circuit Operation - SLOW PIVOT Mode,
Rod Oil Out,” and Section 10.12.8,
“Hydraulic Troubleshooting - SLOW
PIVOT Mode, Rod Oil Out.”
Stabil-TRAK™ light in instrument
cluster is not ON.
Ignition ON, engine running
Boom angle is above
40°
Travel select lever is in (N) NEUTRAL, or
Park brake ON or Service brake ENGAGED
Refer to Section 10.12.11, “Hydraulic
Circuit Operation - LOCKED MODE,”
and Section 10.12.13, “Hydraulic
Troubleshooting - LOCKED MODE, Will
Not Frame Sway Right,” or Section
10.12.15, “Hydraulic Troubleshooting -
LOCKED MODE, Will Not Frame Sway
Left.”
With the boom above 40°, when
swaying the frame to the right
, the left
front tire comes off the ground.
Ignition ON, engine running
Boom angle is above
40°
Travel select lever is in (N) NEUTRAL, or
Park brake ON or Service brake ENGAGED
Refer to Section 10.12.12, “Hydraulic
Circuit Operation - LOCKED MODE,
Frame Sway Right,” and Section
10.12.13, “Hydraulic Troubleshooting -
LOCKED MODE, Will Not Frame Sway
Right.”
With the boom above 40°, when
swaying the frame to the left
, the right
front tire comes off the ground.
Ignition ON, engine running
Boom angle is above
40°
Travel select lever is in (N) NEUTRAL, or Park
brake ON or Service brake ENGAGED
Refer to Section 10.12.14, “Hydraulic
Circuit Operation - LOCKED MODE,
Frame Sway Left,” and Section 10.12.15,
“Hydraulic Troubleshooting - LOCKED
MODE, Will Not Frame Sway Left.”