Overhaul
DISASSEMBLY AND REASSEMBLY
LUBRICATION AND ADHESION POINTS
DISASSEMBLY SERVICE POINTS
SNAP RINGS REMOVAL
1. Make mating marks on the yoke and universal joint that is to be disassembled.
2. Remove the snap rings from the yoke with snap ring pliers.
JOURNAL BEARINGS REMOVAL
Use the special tool to force out the journal bearings from the yoke and propeller shaft.
CAUTION: Do not tap the journal bearings, or the propeller shaft won't function well.
1. Place mating marks on the center yoke and center propeller shaft assembly.
2. Remove the center yoke from center propeller shaft.
Put mating marks on the center propeller shaft, the Lobro joint assembly and the companion flange before removing the bolts.
1. Remove the Lobro joint boot from the Lobro joint assembly.
2. Put mating marks on the outer race, cage and inner race with a scriber.
3. Remove the outer race and balls.
NOTE: Note the positions of balls so that they can be reinstalled in their original positions.
4. Remove the inner race with cage from the center propeller shaft by using a puller (commercially available).
NOTE: When changing the grease on the Lobro joint assembly, wipe off the grease and clean the outer and inner races, cage and balls.
5. If the outer race cannot be removed, remove the complete Lobro joint assembly from the center propeller shaft by using a puller (commercially available).
When reusing the Lobro joint boot, apply plastic tape to the spline section of the center propeller shaft before removing.
>H< COMPANION FLANGE REMOVAL
Put mating marks on the companion flange and the rear propeller shaft before removing the companion flange.
REASSEMBLY SERVICE POINTS
>A< CENTER BEARING ASSEMBLY/COMPANION FLANGE/SELF-LOCKING NUT INSTALLATION
1. Apply multipurpose grease as shown in the figure.
2. Install the center bearing assembly to the rear propeller shaft as shown in the illustration.
3. Align the mating marks on the companion flange and rear propeller shaft.
4. Press-fit the center bearing assembly with the companion flange while tightening the self-locking nut.
>B< LOBRO JOINT BOOT INSTALLATION
1. Before installing the Lobro joint boot, insert the boot band.
2. Wrap the splined end of propeller shaft with plastic tape and install the Lobro joint boot.
>C< LOBRO JOINT ASSEMBLY INSTALLATION
Install the Lobro joint assembly as follows:
1. Apply a thin coat of the specified grease to the ball grooves of the inner and outer races.
Specified grease: Repair kit grease
2. Put the cage on the inner race with the mating marks aligned and install two balls, one in a groove and the other in the groove opposite to that groove. Both balls should be placed in the grooves where they were before disassembly.
3. Assemble the inner race and cage in the outer race with their mating marks aligned.
NOTE: Make sure that the recessed end (where snap ring will be fitted) of the inner race, the recessed end (where packing will be fitted) of the outer race, and the chamfered end of the cage are all on the same side. Also ensure that the relative positions of the inner and outer races are as shown in the illustration.
4. Install the remaining balls in their original positions.
5. Check that the outer race rotates on the inner race smoothly.
6. Apply the specified grease to the Lobro joint assembly.
Specified grease: Repair kit grease 45 - 55 g (1.59 - 1.94 oz.)
7. Apply a small amount of specified adhesive in three equally divided places on the surface on the Lobro joint ball groove where there is a stepped section for the Lobro joint assembly packing, and then fit the rubber packing.
Specified adhesive: Quick fix adhesive 3M ATD Part No. 8155 or equivalent
8. Install the Lobro joint assembly on the center propeller shaft while aligning their bolt holes, and drive the joint assembly with a hammer using a socket wrench on the inner race for complete installation.
NOTE: Install so that the surface where there is a stepped section for the Lobro joint assembly packing is facing toward the Lobro joint boot.
9. Realign the bolt holes in the boot and Lobro joint assembly utilizing the mounting bolts and fit the boot on the joint assembly.
10. Fit the rubber packing for the companion flange to the companion flange using the same procedure as in step (7).
>D< BOOT BAND INSTALLATION
CAUTION: Position the boot band clip on the side opposite to the bosses which are provided in the boot for ventilation. Be sure to remove grease, if present, from around the bosses. Grease obstructs the ventilation air passage.
>E< CENTER BEARING ASSEMBLY/CENTER YOKE/SELF-LOCKING NUT INSTALLATION
1. Apply multipurpose grease as shown in the figure.
2. Install the center bearing assembly to the center propeller shaft as shown in the illustration.
3. Align the mating marks on the center yoke and center propeller shaft.
4. Press-fit the center bearing assembly with the center yoke while tightening the self-locking nut.
>F< JOURNAL/JOURNAL BEARING INSTALLATION
1. Apply multipurpose grease to the following parts of the universal joint kit:
1. Shafts and grease sumps of journal
2. Dust seal lips
3. Needle roller bearings
CAUTION: Do not apply excessive grease. Otherwise, faulty fitting of bearing caps and errors in the selection of snap rings may result.
2. Press fit the journal bearings to the yoke by using the special tool according to the following procedures.
1. Install the base to the special tool.
2. Insert both bearings in the yoke, and hold and press fit them by using the special tool.
>G< SNAP RINGS INSTALLATION
1. Install snap rings of the same thickness onto both sides of each yoke.
2. Press the bearing and journal into one side by using a brass bar.
3. Measure the clearance between the snap ring and the groove wall of the yoke with a feeler gauge. If the clearance exceeds the standard value, the snap rings should be replaced.
Standard value (A): 0.01 - 0.03 mm (0.0004 - 0.0012 inch)
INSPECTION
- Check the propeller shaft splines for wear or damage.
- Check the ball grooves in inner and outer races for uneven wear, damage or rust.
- Check ball surface for rust, wear or other damage.
- Check the cage for rust or damage.