Group 177 Design and Function Brakes Brake Cams and Slack Adjusters For further information concerning component specifica- tions see service information in Group 1, “Oil and Filter Change Intervals for Volvo Components,” publication number 175–001, and appropriate vendor literature. Lubricate the brake cam bushings using a lithium based grease with EP additives and consistency NLGI No. 2. Fill grease until old grease has been pushed out past the seal and new grease can be seen flowing. Lubricate the slack adjusters using a lithium based grease with EP additives and consistency NLGI No. 2.
Fill grease until old grease has been pushed out past the splined shaft area, and adjustment pawl and new grease can be seen flowing. Air Dryers Air dryers have internal maintenance systems that clean out the accumulated moisture frequently and can there- fore work with long maintenance intervals. Eventually the drying medium will be filled up and the cartridge will need to be changed. Change cartridge when there is more water being drained in the daily emptying of the tank than usual. This is a progressive development and the time interval will be different from application to ap- plication.
Dryer manufacturers recommend changing cartridge ev- ery 2 to 3 years but intervals need to be adjusted for application. The only dryer with regular maintenance is the Midland, where the coalescent filter needs changing every year. 26