JLG 740AJ, Service And Maintenance Manual

Page: 413 / 582

SECTION 5 - BASIC HYDRAULIC INFOR M ATION AND SCHE M ATICS
3121160 5-69
Slave Cylinder Removal
1. Place the machine on a flat surface and lower the main
boom and tower boom to the lowest position.
2. Using auxiliary power, retract the slave cylinder rod
completely.
3. Raise the jib to gain access to the Slave Cylinder piston
end Pin.
NOTE: The Slave Cylinder weighs approximately 77.15 lbs. (35 kg).
4. Using a suitable lifting device, properly secure the plat-
form to prevent the platform from tilting backward or
forward during removal of the slave cylinder.
5. Tag and disconnect the slave cylinder hydraulic hoses.
Cap hoses to prevent the hydraulic system from being
contaminated.
6. Properly secure the slave cylinder by using a suitable
sling or support.
NOTE: The Slave cylinder weighs approximately 77.15 lbs. (35 kg).
7. Remove the slave cylinder pin retaining hardware. Using
a suitable brass drift, remove the slave cylinder pins
from the rod and barrel ends.
8. Carefully remove the slave cylinder.
9. Clean and inspect the cylinder pins and retaining hard-
ware for reuse. Replace if necessary.
Slave Cylinder Installation
1. Remove caps from the hydraulic hoses and attach hoses
to the proper cylinder ports.
NOTE: The Slave cylinder weighs approximately 77.15 lbs. (35 kg).
2. Use suitable slings or support to position the Slave cylin-
der in place. Align barrel end mounting holes with the
holes in main fly boom.
3. Use suitable mallet to install the barrel end attach pin
and torque the bolts to 35 ft. lbs. (48 Nm).
4. Extend the slave cylinder rod until the rod attach pin
hole aligns with holes in the platform pivot. Use suitable
mallet and keeper to install the rod end pin.
5. Remove lifting device from the slave cylinder and sup-
port from the platform.
6. Use all applicable safety precautions, start the machine
from the ground control. Fully raise and lower the main
boom through several cycles to bleed the platform level
hydraulic circuit.
7. Check for proper operation and hydraulic leaks.
8. Check the fluid level of hydraulic tank. Fill the tank, if
required.
SLAVE CYLINDER