JLG 723A Service Manual - Manual (Page 63)

5-9 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
Axles, Drive Shafts, Wheels and Tires
5.5 DRIVE SHAFTS
5.5.1 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.
5.5.2 Drive Shaft Maintenance
Refer to Section 2.6, “Lubrication Schedule,” for
information regarding the lubrication of the grease fittings
on the drive shafts.
5.5.3 Drive Shaft Removal
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 a 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. Properly disconnect the battery.
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 and four locknuts (1)
securing the flange yoke (2) to the front axle flange.
7. Remove the four capscrews (3) securing the flange
yoke (4) to the rear axle flange.
8. Remove the drive shaft assembly (5).
5.5.4 Drive Shaft Cleaning and Drying
1. Disassemble and clean all parts. Allow to dry.
2. Remove any burrs or rough spots from all machined
surfaces. Re-clean and dry as required.
5.5.5 Drive Shaft Installation
1. Raise the drive shaft assembly (5) 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.
Note: Yokes at both ends of the drive shaft must be in
the same plane to help prevent excessive vibration.
2. Install the four capscrews and four locknuts (1)
securing the flange yoke (2) to the front axle using
Loctite
® 243 TM and torque the capscrews to
139 Nm (102 lb-ft).
3. Install the four capscrews (3) securing the bearing
crosses to the rear axle using Loctite ® 243 TM and
torque the capscrews to 139 Nm (102 lb-ft).
4. Properly connect the battery.
5. Close and secure the engine cover.
6. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
MZ6030
TO REAR AXLE
TO FRONT AXLE
4
5
2
1
3