Oscillating Axle Option (After Serial Number Gs9004-41690) - Genie GS-3390 Service Manual

July 2007
REV C
9-4
Oscillating Axle Option
(after serial number GS9004-41690)
How the
Oscillating Axle Functions
When driving the GS-90 with the platform in the
stowed position, the oscillating axle function
ensures that all four wheels maintain solid contact
with the ground, delivering the maximum traction
available.
When driving the GS-90 with the platform raised
above the down limit switch height, the oscillating
axle function is limited in that the oscillating
cylinders only respond to input from the oscillating
axle limit switches, located on the rear axle.
Oscillate Stowed Relay CR84
Terminal 30 of the Oscillate Stowed relay, CR84,
receives power from the Platform Down limit
switch, LS6. When the platform is raised above
LS6, power to terminal 30 will be cut.
Terminal 86 of CR84 is connected to pin J2-C5 at
the ECM. Pin J2-C5 is powered anytime the Brake
Release valve coil Y2 is energized, thus energizing
CR84 terminal 87 and, ultimately, all four oscillating
valve coils, allowing oil to pass between the
oscillating cylinders. J2-C5 continues to power
terminal 86 for 0.5 seconds after Y2 is de-
energized.
Oscillate Raised Relay CR85
Terminal 30 of the Oscillate Raised relay, CR85,
receives power from the Power relay, CR42. When
power is cut to terminal 86 of CR42 via key switch
or either Emergency Stop button, power to terminal
30 of CR85 will be lost.
Terminal 86 of CR85 receives continuous power
from pin J2-C6 when the ECM is powered until an
outrigger is lowered to the ground, at which point
the power from J2-C6 is cut.
Part No. 72863
Oscillate Limit Switches LS22, LS23
The right and left oscillating limit switches, LS22
and LS23 respectively, are normally closed limit
switches, held in the open position when the
machine is on a level surface.
When the left rear or right rear wheel 'drops', the
limit switch will relax and close its circuit, sending
power to the appropriate oscillating valve coil.
CB2
20A
B1
+
-
GS-3390 • GS-4390 • GS-5390
Section 4 • Repair Procedures
STEER AXLE COMPONENTS
FROM PLATFORM CONTROLS EMERGENCY STOP
LS6
PLAT
N.C.
DOWN
LIMIT
SWITCH
CR84 CR85
CR42
OSCILLATE OSCILLATE
POWER STOWED RAISED
2 11
86 30 86 30 86
85 87 87A
85 87 87A 85
N.C.H.O.
LS23
LEFT
OSCILLATE
LIMIT SWITCH
Y54
Y57
J2-C1/C3
J2-C5
J2-C6
U5
12
30
ELECTRONIC
CONTROL
87 87A
MODULE
N.C.H.O.
LS22
RIGHT
OSCILLATE
LIMIT SWITCH
Y56
Y55
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