Lull 944E-42 Service Manual - Manual (Page 82)

Axles, Drive Shafts, Wheels and Tires
5-10 944E-42
5.4 DRIVE SHAFTS
5.4.1 Drive Shaft Inspection and Service
Whenever servicing the machine, conduct a visual
inspection of the drive shafts and cross and bearing
assemblies (universal joints, or U-joints). A few moments
spent doing this can help prevent further problems and
down time later.
Inspect areas where the drive shaft flange yokes and slip
yokes mount to the drive shafts. Attempt to turn each
drive shaft in both directions. Look for excessive
looseness, missing parts, cracks or other damage. Worn
or damaged drive shafts and cross and bearing
assemblies 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 2.4, “Fluid and Lubricant Capacities.” 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 system fluids 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 bolts (1) and two straps (2)
securing the bearing cross to the transmission
output shaft flange. Discard bolts.
8. Remove the four bolts (3) and two straps (4)
securing the bearing crosses to the axle. Discard
bolts.
9. Remove the front drive shaft assembly.
10. Repeat the above procedure on 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 and burrs or rough spots from all machined
surfaces. Re-clean and dry as required.
5.4.5 Drive Shaft Installation
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.
Note: The yokes at both ends of the drive shaft must be
in the same plane to help prevent excessive vibration.
2. Apply Loctite ® 242™ to all mounting bolts.
3. Install the two straps (2) and four new bolts (1)
securing the bearing crosses to the transmission.
Torque bolts to 55-60 lb-ft (75-81 Nm).
4. Install the two straps (4) and four new bolts (3)
securing the bearing crosses to the axle. Torque
bolts to 55-60 lb-ft (75-81 Nm).
5. Repeat the above procedure on the rear drive shaft.
6. Properly connect the battery.
7. Close and secure the engine cover.
8. Unblock the wheels.
9. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
MT0350
To Axle
To Transmission
3
1 2
4