Skytrak 8042 - Hydraulic Troubleshooting - Extend Interlock Mode

Stabil-TRAK™ System and Boom Interlock System
10-44
31211015 6036, 6042, 8042, 10042, 10054
10.12.2 Hydraulic Circuit Operation -
Extend Interlock Mode
Operation:
When the outriggers in the RAISED position, the outrigger
pressure switches (1 and 2) are open.
As the boom is extended past the boom extend switch, the
switch opens, de-energizing the boom lockout solenoid (3).
This allows pressurized oil to flow through the valve body (4)
to the piston side of the pilot-operated valve (5), causing it to
close. This prevents oil flow to the extend/retract cylinder (6),
preventing the boom from being extended further.
Retract function is still allowed, as oil flow through MCV (8)
reversed, forcing the counterbalance valve (9) to open.The
oil flow will cause the pilot-operated valve (5) to open,
returning oil to the main control valve (8) and reservoir (10).
10.12.3 Hydraulic Troubleshooting - Extend Interlock Mode
Not
Not
Not
When engaging the boom extend
controls, the boom does not extend.
Conditions:
• Ignition ON,
engine running
• Outriggers RAISED
• Travel select lever in
(F) FORWARD or (R)
REVERSE
• Park brake OFF
• Service brake
DISENGAGED
Check solenoid coil from the boom lockout
valve for correct resistance (7-9 ohms).
Remove solenoid cartridge from boom
lockout valve and inspect
fordebrisordamage.
Replace solenoid.
Clean passages or replace cartridge.
If OK
If OK
If OK
Not
Replace check valve(s).
Inspect check valves
on extend/retract cylinder.
Check electrical wiring.
Refer to Section 10.9, “Stabil-TRAK Boom
Interlock Electrical Circuit Operation and
Troubleshooting (10054),”