SMORACY BEAST 3680 - TIRE WEAR SECTION; Tire Wear Diagnostics and Brake Adjustment

Copyright 12/14 64 S/N XXXX WO#XXXXXX
Smoracy, LLC
MODEL 3680
TIRE WEAR DIAGNOSTIC CHART
The wear pattern and tread life of tires involves many variables that the user has control of, but DOES NOT fall under
faulty manufacture or design.
The following is a list of some causes supplied by tire suppliers and axle manufacturers:
• Misalignment - from rough roads, pot holes, excessive speeds and hitting curbs.
• Tire Width - the wider the tire for flotation, the more uneven the tire wear.
• Tire Air Pressure - too much or too little, for the load.
• Vehicle Hitch Height - if trailer is not level with ground, axle camber is misaligned.
• Maintenance - wheel bearing lubrication and adjustment. Follow axle MFG. instructions.
• Brakes - uneven or misadjusted brakes cause irregular brake activation.
RECOMMENDED BRAKE ADJUSTMENT PROCEDURE PER AXLE MANUFACTURER.
The proper clearance between the shoe and drum surfaces will be set up initially from our factory to assure proper
operation during the normal break in period. No further adjustment will be necessary until the vehicle completes the
recommended break in period of 200 miles (322 km).
Since all brakes of this type must be burnished or “run in” before their full effectiveness can be achieved, the MFG.
maintenance manuals call for readjustment after the first 200 miles (322 km) of operation. This usually allows
ample time for the burnishing to take place. Readjustments is not necessary for brakes fitted with self-adjustment
features although periodic inspection is suggested.
The following shows the correct adjustment for the MFG. brakes ranging from 12” through 12 1/4” diameter.
Caution Clearances that are too small will result in excessive drag and overheating while too much
clearance can render the brake nonfunctional.
For additional brake adjustment procedures consult the axle manufacturer manual.
AXLE SIZE
25000 LBS.
SIZE
12 1/4” X 5”
TYPE
Air Brake
DIAMETRAL CLEARANCE
.010” (.25 mm)
CLICKS TO BACK OFF
Manual Slack Adjusting
Wear Pattern Cause Action
Center Wear Over Inflation Adjust pressure to particular
load per tire catalog
Edge Wear Under Inflation Adjust pressure to particular
load per tire catalog
Side Wear Not Hauling Trailer Level Must be hauled parallel to ground
Bent Axles Replace as needed
Wide Tires Characteristic of wide flotation tires
Wheel Bearings Adjust or replace
Cupping Out-Of-Balance Check bearing adjustment and balance tires
Wheel Bearings Adjust or replace
Flat Spots Wheel Lock Up & Tire Avoid sudden stops when possible and
Skidding adjust brakes.
TIRE WEAR SECTION