JLG G6-23A Service Manual - Manual (Page 51)

5.9 G5-19A, G6-23A
Axles, Drive Shafts, Wheels and Tires
5.4 DRIVE SHAFTS
5.4.1 Drive Shaft Inspection
Whenever servicing the machine, conduct a visual
inspection of the drive shaft and cross and bearing
assembly (universal joints, or U-joints). A few moments
spent doing this can help prevent further problems and
down time later.
Inspect area where the drive shaft flange yoke and slip
yoke mount to the drive shaft. Attempt to turn drive shaft
in both directions. Look for excessive looseness, missing
parts, cracks or other damage. Worn or damaged drive
shaft and cross and bearing assembly may cause an
excessive amount of vibration or noise.
5.4.2 Drive Shaft Maintenance
Refer to Section 2.6, “Lubrication Schedules,” for
information regarding the lubrication of the grease fittings
on the drive shafts.
5.4.3 Drive Shaft Removal
IMPORTANT: To help ensure optimum performance, the
drive shaft assemblies are specially balanced as a unit at
the factory. When servicing, order a complete assembly
if components are bent or damaged. Refer to the
appropriate parts manual for ordering information.
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place an Do Not Operate Tag on both the ignition
key switch and steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Disconnect the battery negative (-) cable at the
battery negative (-) terminal.
5. The drive shaft assembly is a balanced assembly.
Mark the yoke and axle, transmission and the shaft
and slip yoke so that these components can be
returned to their original positions when reinstalled.
Yokes at both ends of the drive shaft must be in the
same plane to help prevent excessive vibration.
6. Remove the four capscrews (1) and four locknuts
securing the yoke flange (2) to the front axle flange.
7. Remove the four capscrews securing the flange yoke
to the rear axle flange.
8. Remove the drive shaft assembly (3).
5.4.4 Drive Shaft Cleaning and Drying
1. Disassemble and clean all parts using an approved
cleaning fluid. Allow to dry.
2. Remove any burrs or rough spots from all machined
surfaces. Re-clean and dry as required.
5.4.5 Drive Shaft Installation
IMPORTANT: To help ensure optimum performance, the
drive shaft assemblies are specially balanced as a unit at
the factory. When servicing, order a complete assembly
if components are bent or damaged. Refer to the
appropriate parts manual for ordering information.
1. Raise the drive shaft assembly (3) into position. The
slip-yoke end of the drive shaft mounts toward the
front axle. If reinstalling a drive shaft previously
removed, align the flange yokes according to the
alignment marks made during removal.
IMPORTANT: Yokes at both ends of the drive shaft must
be in the same plane to help prevent excessive vibration.
2. Install the four capscrews (1) and four locknuts
securing the yoke flange (2) to the front axle.
Loctite
® and torque the capscrews to
102 lb-ft (139 Nm).
3. Install the four capscrews securing the bearing
crosses to the rear axle. Loctite ® and torque the
capscrews to 102 lb-ft (139 Nm).
4. Connect the battery negative (-) ground cable at the
battery negative (-) terminal.
5. Close and secure the engine cover.
MAH0450
To Rear Axle
To Front
Axle 1
3
2