SkyTrak 8042 Service Manual User Manual
Page 895
Stabil-TRAK™ System and Boom Interlock System
10.54
Model 8042, 10042, 10054 Legacy
Rev. 10/03
10.13.4
Hydraulic Circuit Operation -
Outrigger Interlock Mode
Operation:
When the outriggers are lowered onto firm terrain,
pressure within the outrigger cylinders close the outrigger
pressure switches (1 and 2), energizing the boom extend
lockout solenoid valve (3).
As the boom extends past the boom extend switch, the
switch opens. The boom extend lockout solenoid
valve (3), remains energized by the circuit provided by
the outrigger pressure switches.
Pressurized oil flows to the base of the pilot-operated
valve (4), opening the valve and allowing oil to flow to the
extend/retract cylinder (5).
10.13.5
Hydraulic Troubleshooting - Outrigger Interlock Mode
Not
OK
Not
OK
Boom will not extend to its full limits.
Conditions:
• Both outriggers lowered onto
firm terrain.
Note: When the outrigger
interlock mode is engaged, the
following systems are
automatically activated:
• Stabil-TRAK™ system is in the
LOCKED MODE. (Refer to
Section 10.4, “Stabil-TRAK™
Operation,” for more
information.)
• Transmission has been
DECLUTCHED.
• Park brake ENGAGED.
• Outrigger RAISE function has
been DISABLED. However, the
LOWER function is still active,
to allow for any changes in
outrigger footing.
Check solenoid coil from the boom
lockout valve for correct resistance
(7-9 ohms).
Remove solenoid cartridge from boom
lockout valve and inspect
for debris or damage. Refer to Section
8.12.9, “Extend Lockout Valve (10054).”
Replace solenoid.
Clean passages or replace
cartridge.
If OK
If OK
If OK
Not
OK
Replace check valve(s).
Inspect check valves on extend/retract
cylinder. Refer to Section 8.13.6,
Not
OK
Check outrigger pressure switches for
proper operation. Refer to Section
9.14.5, “Outrigger Switches (10042/
Replace switch(es).
If OK
Not
OK
Check electrical wiring.
Refer to Section 10.9, “Stabil-