JLG 4013PS Service Manual - Manual (Page 83)

5-9 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
Axles, Drive Shafts, Wheels and Tires
5.4 DRIVE SHAFTS
5.4.1 Drive Shaft Inspection and Service
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.
Note: Any bolt removed from the drive shaft assembly
MUST be replaced. Do Not re-torque.
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
1. Park the machine on a firm, level surface, level the
machine, 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 engine to cool.
4. Properly disconnect the battery.
5. Block the wheels.
6. 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.
7. Remove the four capscrews (1) and two straps (2)
securing the bearing cross to the transmission
output shaft flange. Discard capscrews.
8. Remove the four capscrews (3) and two straps (4)
securing the bearing crosses to the axle. Discard
capscrews.
9. Remove the front drive shaft assembly.
10. Repeat the above procedure for the rear drive shaft.
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
Note: The yoke at both ends of the drive shaft must be
in the same plane to help prevent excessive vibration.
1. Raise the drive shaft assembly into position. The
slip-yoke end of the drive shaft mounts toward the
axle. If reinstalling a drive shaft previously removed,
align the flange yokes according to the alignment
marks made during removal.
2. Install the four capscrews and two straps securing
the bearing crosses to the transmission. Torque the
capscrews to 38 Nm (28 lb-ft).
3. Install the four capscrews and two straps securing
the bearing crosses to the axle. Torque the
capscrews to 38 Nm (28 lb-ft).
4. Repeat the above procedure on the rear drive shaft.
5. Properly connect the battery.
6. Unblock the wheels.
7. Close and secure the engine cover.
8. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
To Transmission
To Axle
1
2
3
4