How to Install the Mainshaft Assembly

Special Instructions

The lower countershaft bearings and the input shaft must be installed.

Check to make sure the lower countershaft drive gear marked tooth is in time with main drive gear set of marked teeth.

Special Tools

• Typical Service Tools • A large hook or 3' piece of rope

Procedure -

1. Block the upper countershaft against the case wall.

2. With reverse gear forward against the next speed gear, lower the mainshaft assembly while pulling the shaft rear through the case bore.

3. Move the mainshaft pilot-end into the input shaft pilot bushing. Mesh the mainshaft gears with the corresponding forward countershaft assembly gears.

4. Center the mainshaft rear in case bore and temporarily position the auxiliary drive gear on the mainshaft. Partially seat the bearing in the bore.

WARNING: At this time other components of the front section must be Installed before the mainshaft installation can be completed, see “How to Install the Countershaft Bearings”.

5. Mesh the reverse gear teeth with the reverse idler gear teeth and move the reverse gear to the rear as far as possible.

6. Remove the auxiliary drive gear.

7. Align the reverse gear spacer external splines with the reverse gear and move the spacer into the reverse gear.

8. Install the reverse gear I.D. snap ring and move the reverse gear forward on the mainshaft and against the reverse gear limit washer.

9. Install the reverse gear retaining snap ring in the mainshaft second snap ring groove.