SkyTrak 6042 Service Manual - Manual (Page 528)

Stabil-TRAK™ System
10.22 Model 6042 Legacy Origin 7/02
10.5.11 Hydraulic Circuit Operation - Locked
Mode
a. Conditions:
• Boom angle is above 40°
• Park brake ON, or service brake ENGAGED, or travel
select lever in (N) NEUTRAL
b. Operation:
When the conditions are met, solenoids 4A, 4B, 12A and
12B are de-energized and solenoid 3 is energized. In the
LOCKED MODE, oil is prevented from flowing through
the Stabil-TRAK™ manifold due to check valves in
solenoid-operated valves 4A (Fig. 10-26, 1 and
Fig. 10-27, 1), 4B (2), 12A (3), and 12B (4).
10.5.12 Hydraulic Circuit Operation -
Locked Mode, Frame Sway Right
When the joystick control is placed in the frame sway
mode, cables activate the frame sway valve in the main
control valve assembly. As the joystick is moved to the
right, the frame sway spool valve is shifted, allowing oil to
flow through the valve, to the Stabil-TRAK™ manifold,
port V.
Oil entering the Stabil-TRAK™ manifold at port V flows
through solenoid cartridge valve 3 (Fig. 10-26, 5 and
Fig. 10-27, 5), through a .030" orifice (Fig. 10-26, 6) and
check valve 2A (Fig. 10-27, 7), to the base end of the
stabilizer cylinder (8). The orifice slows the movement of
the frame sway.
Some of this oil is diverted to the pilot line of check
valve 2B (Fig. 10-26, 9 and Fig. 10-27, 9), opening the
valve.
Rod end oil from the stabilizer cylinder flows through
check valve 2B (Fig. 10-26, 9 and Fig. 10-27, 9), opened
by pilot pressure in the Stabil-TRAK™ manifold. The oil
then flows through cartridge valve 3 (5), out of the
Stabil-TRAK™ manifold at port FTR, through a check
valve fitting with a .040" orifice disk (Fig. 10-26, 11),
through a check valve (12), to the rod end of the frame
sway cylinder (13).
Oil from the base end of the frame sway cylinder flows
through a piloted-open check valve (Fig. 10-26, 14),
through the check valve fitting with a .047" orifice disk
(15) and back through the frame sway spool valve in the
frame sway section of the main control valve, dumping
the returned oil to the reservoir.
Pressurized oil entering the Stabil-TRAK™ manifold at
port P is stopped at the four closed solenoid-operated
valves 4A (Fig. 10-26, 1 and Fig. 10-27, 1), 4B (2), 12A (3)
and 12B (4).