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Glenntools

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    I started working on Mack trucks in 1981 at UPS, 1967 F models. Retired and opened Rowland Mechanical where I have worked on a variety of Mack trucks. ASE Master Medium And Heavy Duty Truck Technician since 1993.

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  1. The spiders are the same but the S cams are different lengths. The mounting plate for the chambers/tubes for the S cams need to be changed. The spiders will need to be clocked differently as the present position has the chambers closer to the frame rail than the distance between the top of the axle and the bumper pad( the chamber would hit the frame before the springs bottomed out).
  2. I am working on a CH model rear brakes. A previous repair was made where the rear rear axle was replaced. The replacement axle is different from the front rear axle. Both axles have 6" slacks although the rear axle is made for 7" slacks. The previous shop elongated the hole in the chamber where the push rod goes through and hammered in the clevis pin. The brakes wouldn't release on this axle. My question is if 6" slacks are on the front axle and 7" slacks on the rear axle, I believe the brakes won't apply evenly. All chambers will travel the same distance however the 6" slacks will travel less to apply the brakes verses the 7" slacks. Can anyone verify my theory?
  3. I am helping Eveready with the brake work. The " ring " he is referring to is the brake spider. The replacement axle should have had 7" slacks however 6" were installed by elongating the hole in the chamber and forcing the clevis onto the slack. The brakes weren't releasing due to the push rod dragging in the chamber. My concern with installing 7" slacks on the rear axle and 6" slacks on the front drive axle is the the force applied to the front axle will be greater than the force applied to the rear axle. The chambers will be traveling the same distance although the S cams will be traveling different distances due to the different lengths of the slacks. Can anyone validate my thoughts about using 6" slacks on the front drive and using 7" slacks on the rear drive?
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