REPAIR INSTRUCTIONS

1.The following figure shows the breather vent removed (1) and installed (2). Check the breather vent for free airflow. Clean or replace, if necessary.

2.Install a new O-ring onto the piston sleeve.

Before installation, lightly lubricate all O-rings for the range shift cylinder piston, sleeve and rail with a multipurpose grease that meets MACK specification MG-C.

3.Install a new small O-ring located on the shift rail.

4.Insert the rail into the piston and install and tighten the shift rail nut to 102–142 N•m (75–105 lb-ft) torque.

Do not clamp the shift piston or shift rail in a vise. This can cause damage to the piston or rail, preventing proper shifting.

To prevent damage to the shift rail or piston when removing the nut, temporarily install the shift fork and tighten the setscrew. This provides leverage for tightening the nut. Remove the shift fork for later installation.

6.Install