Stabil-trak™ system and boom interlock system, Pressure suction return load sense – SkyTrak 6036 Service Manual User Manual
Page 262
Stabil-TRAK™
System and Boom Interlock System
10-34
6036, 6042, 8042, 10042, 10054
10.11.8
Hydraulic Circuit Operation - SLOW PIVOT Mode, Base Oil Out
Conditions:
• Boom angle is above 40°
• Park brake OFF
• Service brake DISENGAGED
• Travel select lever in (F) FORWARD or (R)
REVERSE position
Operation:
As the boom is raised above 40°, the boom proximity
switch is deactivated causing solenoids 12A and 12B to
de-energize and solenoids 4A and 4B to energize. This
allows oil to flow from the base end of the Stabil-TRAK™
cylinder (1), through solenoid-operated valve 4A (2),
through a 0.060 inch orifice (3), through another 0.060 inch
orifice (4), then through solenoid-operated valve 4B (5), to
the rod end of the Stabil-TRAK™
cylinder.
The 0.060 inch orifices (3 and 4) in solenoid-operated
valves 4A and 4B will slow the movement of the rear axle
in reaction to terrain changes. The frame level will react
normally in this mode.
Because of greater volume of oil in base end, extra oil is
returned to the tank through the 100 psi (7 bar) reducing
cartridge (6) in the Stabil-TRAK™
manifold. Restrictions
produce slow movement, or SLOW PIVOT mode.
STABIL-TRAK
CYLINDER
TM
FTR
P
T
V
Pressure
Suction
Return
Load Sense
G3
G2
G1
4A
4B
12B
3
2B
2A
12A
FRAME
LEVEL
CYLINDER
.060 DIA.
.030 DIA.
.060 DIA.
100 PSI
SOLENOID COIL
STATE
ENERGIZED
DE-ENERGIZED
DE
E
DE
E
E
DE
DE
P
T
C
PS
PB
PLT
PSG
PBG
G
IN
T
T
AT
TA
C
H
TIL
T
P
FRAME
SW
A
Y
EXT/RET
LFT/L
WR
AU
X
STABIL-TRAK
MANIFOLD
TM
HYDRAULIC
OIL COOLER
BYPASS
CHECK
VALVE
BYPASS
CHECK
VALVE
HYDRAULIC
RESERVOIR
SECONDARY
FUNCTION
MANIFOLD
PUMP
MAIN CONTROL
VALVE
MAQ3082
1
2
3
4
5
6