SkyTrak 6036 Service Manual - Manual (Page 270)

Stabil-TRAK™ System and Boom Interlock System
10-42 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 boom
lockout valve reversed, forcing pilot-operated check valve
(7) and counterbalance valve (8) to open.The oil flow will
cause the pilot-operated valve (5) to open, returning oil to
the main control valve (9) and reservoir (10).
10.12.3 Hydraulic Troubleshooting - Extend Interlock Mode
Not
OK
Not
OK
Not
OK
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
for debris or damage.
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.
Check electrical wiring.
Refer to Section 10.9, “Stabil-TRAK™
Boom Interlock Electrical Circuit
Operation and Troubleshooting (10054),”