Hydraulic Circuit Operation - Free Pivot Mode, Rod Oil Out - JLG sky trak mmv Service Manual

Stabil-TRAK™ System
11.4.3

Hydraulic Circuit Operation - Free Pivot Mode, Rod Oil Out

FRAME
SWAY
CYLINDER
STABILIZER
CYLINDER
G2
12B
4B
3
E DE
.060 DIA.
2
Pressure
Return
Pilot Pressure
Suction
Load Sense
Conditions:
• Boom angle is below 40°
• Rear axle pivots freely
• Travel select lever in [F] FORWARD or [R] REVERSE
position
• Park brake OFF
• Service brake DISENGAGED
11.8
G3 FTR
3
5 DE
2A
.030 DIA.
6
2B
4A
DE
.060 DIA.
100 PSI
G1
STABIL-TRAK™
MANIFOLD
4
DE DE-ENERGIZED
E ENERGIZED
PILOT
SELECT
MANIFOLD
TO
JOYSTICK
“T”
V
TO
12A
JOYSTICK
“P”
E
1
T
P
Operation:
Note: Refer to Section 11.4.7, Electrical Schematic -
Free Pivot Mode, for the electrical schematic for this
circuit.
When the conditions are met, solenoids 12A (1) and
12B (2) are energized. As the left side of the rear axle
moves down, the rod extends, forcing hydraulic oil out
from the rod end of the stabilizer cylinder (3). The oil then
flows through the solenoid-operated valves 12B (2) and
12A (1), to the base side of the stabilizer cylinder.
Because the volume of oil needed on the base side is
greater than that needed on the rod side, the extra oil
needed is supplied from the main hydraulic system
through a 100 psi (7 bar) reducing cartridge (4) in the Sta-
bil-TRAK™ manifold.
HYDRAULIC RESERVOIR
HYDRAULIC
OIL COOLER
PUMP
SECONDARY
FUNCTION
MANIFOLD
CF PIL
T
P
PBG
PP PPG PB
UNLOADER
VALVE
MAIN
CONTROL
VALVE
Model MMV Rev. 12/04
ACCUMULATOR
CHARGE
VALVE
EF ACF ACR LS
LSG
P P1 SW DRAIN
MM2261