Usage:
785, 789 Trucks
New ring seals are available for parts service for the front and rear suspension groups on 785 and 789 Trucks. These seals are to be used where leakage has been experienced at low temperatures. The new seals are not to be used on trucks equipped with load sensing devices because the new seals will produce inaccurate readings for these systems.
Illustration 1. Location of new ring seal in front suspension group.
A new 8C9147 Ring Seal is available as a parts service replacement for the 8T7575 Ring Seal in the 1U4605 and 1U4651 Front and Rear Suspension Groups on 785 Trucks.
A new 8C9148 Ring Seal is available as a parts service replacement for the 8T7573 Ring Seal in the 4T5182 and 4T4844 Front and Rear Suspension Groups on 789 Trucks.
Illustration 2. Location of new ring seal in rear suspension group.
Procedure To Install Ring Seals In Rear Suspension Cylinders
1. Without the seals installed, slide the head onto the rod.
2. Install the piston on the rod.
3. Slide the head up the rod to just beneath the eye.
4. Move each new seal over the eye.
5. Install the seals in the grooves in the head as shown in Illustration 2.
6. Move the wiper over the eye and install it in the head.
7. Slide the head down over the rod by striking each side of the head at the head at the same time with a soft hammer.
| NOTICE |
|---|
The new seals can be damaged when passing over the check ball holes if the rod is installed through the head from the piston end. Installing the piston on the rod before installing the seals insures correct assembly.
|