JLG 40RTS Service Manual - Manual (Page 39)

SECTION 2 - PROCEDURES
3120826 – JLG Sizzor – 2-23
2. Activate machine hydraulic system from platform
control station.
3. Start the Engine and place Engine Speed and Drive
Speed control switches to their respective “LOW”
positions.
4. Depress the Enable switch and activate Drive con-
troller to “FORWARD” position.
5. Using a suitable lifting equipment lift front of
machine up and place a 20 cm (8 in.) high block
under left front wheel.
6. With the drive controller activated and engine at
idle, crack open both fittings at lockout cylinder, one
at a time, and close when all air is dissipated (bled).
7. Using a suitable lifting deviece lift front of machine
and remove the block.
8. Transfer the block to right front wheel and repeat
steps 1 through 6, substituting the word “right” for
“left” in steps 5.
NOTE: After lockout cylinders are bled be sure to engage
drive hubs before removing stop block from rear
wheels.
9. To check lockout cylinder after bleeding, refer to
Section 2.22, Lockout Cylinder Check.
2.22 LOCKOUT CYLINDER CHECK
NOTE: Ensure platform is completely lowered prior to begin-
ning lockout cylinder check.
1. Place a 20 cm (8 in.) high block with ramp in front of
left front wheel.
2. Activate machine hydraulic system from platform
control station.
3. Place Engine Speed and Drive Speed control
switches to their respective “LOW” positions.
4. Place Drive controller to “FORWARD” position and
carefully drive machine up ascension ramp until left
front wheel is on top of 20 cm (8 in.) high block.
5. Raise machine platform approximately 0.6 meters (2
ft.); ensure lockout cylinder cam valve is free of siz-
zor arm trip bar.
6. Place drive controller to “REVERSE” position and
carefully drive machine off block and ramp.
7. Have an assistant check to see that left front wheel
remains locked in position off the ground.
8. Lower machine platform; lockout cylinder should
then release the wheel and allow it to rest on the
ground.
9. Transfer the block to front of right front wheel and
repeat steps 1 through 8, substituting the word
“right” for “left” in steps 1, 4 and 7.
10. If lockout cylinder does not function properly, have
qualified personnel correct the malfunction prior to
any further operation.
2.23 PISTON DRIVE MOTOR
Disassembly
1. Clean outside of unit thoroughly.
2. Clamp drive shaft in a protected jaw vise with back
plate end up.
3. Remove six cap screws from back plate.
4. Use a plastic mallet and tap the back plate to loosen
it.
5. Remove o-ring from back plate.
6. Remove complete piston block assembly from
housing assembly.
7. Remove piston assemblies, spider, and pivot from
piston block assembly.
8. The piston block assembly need not be disassem-
bled unless pins or spring are damaged.
Figure 2-25. Drive Hub Connect