SECTION 3 - CHASSIS & TURNTABLE
3-2
– JLG Lift –
3120740
4.
Wheel nuts should be torqued after first 50 hours of
operation and after each wheel removal. Check torque
every 3 months or 150 hours of operation.
3.2
OSCILLATING AXLE BLEEDING PROCEDURE AND
LOCKOUT TEST
Lockout Cylinder Bleeding
To start the test, the axle must be fully oscillated in one direc-
tion. Start with oscillating the axle so that the left lockout cyl.
is fully retracted (left front tire up), and the right lockout cyl. Is
fully extended (right front tire down).
ENSURE PLATFORM IS FULLY LOWERED AND BOOM IS CENTERED OVER REAR
AXLE PRIOR TO BEGINNING BLEEDING PROCEDURE. MAKING SURE MACHINE
IS ON A LEVEL SURFACE AND REAR WHEELS ARE BLOCKED, BRAKE WIRE IS
DISCONNECTED.
1.
Making sure machine is on a level surface and rear
wheels are blocked, brake wire is disconnected.
2.
Center boom over rear axle making sure that cam valve
is depressed.
NOTE:
Step (2) is applicable for machines built Prior to S/N
0300083331.
NOTE:
To oscillate the axle, the lockout valve plunger must be
depressed.
3.
Using a Phillips screwdriver, remove screw from connec-
tion on the brake valve and remove connector as shown.
4.
Use suitable container to retain any residual hydraulic
fluid, place container under the lockout cylinder.
5.
With the left lockout cyl. retracted, open the bleeder on
top of the cylinder, then have an operator from the plat-
form (on high engine) feather drive. Activate drive just
enough so the engine is under load but not enough to
stall the engine.
6.
Close the bleeder when there is a steady stream of oil
and not air.
7.
With the axle in the same position, go to the right lock-
out cyl. and open the bleeder at the rod end. Activate
drive in the same manner and close when all air has
been purged.
8.
Close the bleeder when there is a steady stream of oil
and not air.
9.
Oscillate the axle the other direction, left lockout cyl.
extended (tire down), right lockout cyl. retracted (tire
up). Use the same procedure for the bleeder in the rod
end of the left lockout cyl., Then the piston end of the
right lockout cyl. then close.
10.
Repeat this process one more time to ensure that all air
has been purged from the system.
11.
Perform oscillating axle lockout test.
12.
If necessary, repeat steps 1 thru 9.
13.
Reinstall the brake wires. See Figure 3-2.
NOTE:
Bleeding of the oscillating axles is an infrequent operation
performed after hydraulic line failure and or lockout cylin-
der repair.
Table 3-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage
2nd Stage
3rd Stage
70 ft. lbs.
(95 Nm)
170 ft. lbs.
(225 Nm)
300 ft. lbs.
(405 Nm)
Figure 3-1. Oscillating Valve Adjustment
Brake Valve (Prior to S/N 0300083332)
Figure 3-2. Brake Valve Wiring Connection
Brake Valve
(S/N 0300083332
to S/N 0300183033)
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