Usage:
D25D (1HK) D250D (6NG),
D300D (5MG),
D250E (5TN),
D300E (7FN),
D350E (9LR),
D400E (2YR) Articulated Trucks
- SUPPLEMENT: MAY 11, 1998
Service Magazine SEPD0402, Article 16, Page 13; February 2, 1998; "Improvements To Brake Caliper Seals Prevent Leaks in High Temperature Applications" for D25D (1HK), D250D (6NG), D300D (5MG), D250E (5TN), D300E (7FN), D350E (9LR), and D400E (2YR) Articulated Trucks.
The model numbers and effectivity listed were incorrect. See article entitled, "Improvements To Brake Caliper Seals Prevent Leaks In High Temperature Applications" in Service Magazine SEPD0416 for corrections.
--------------- END SUPPLEMENT ---------------
This article replaces the previous article published May 5, 1997; "Improvements To Brake Caliper Seals Prevent Leaks In High Temperature Applications".
The seal kits, in the following chart, have new Viton radial plug seals which withstand temperatures up to 200° C (392° F). The new 145-4948 Cover is a thicker cover design to prevent deflection. The following improvements are adaptable to articulated trucks as listed in the chart. Refer to the illustrations and Component Identification Chart below for the proper installation of the backup rings.
Illustration 1. 145-4947 Seal Kit. See Illustration 2 for break out View A.
Illustration 2. 145-4947 Seal Kit. Correct backup ring installation. Backup ring should be installed on the boot side. The slant should also be towards the boot side.
Illustration 3. 145-4946 Seal Kit. See Illustration 4 for break out View B.
Illustration 4. 145-4946 Seal Kit. Correct backup ring installation.
