TM 10-4610-241-24
TO 40W4-13-42
Table 2-2. Unit Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
SUSPENSION ASSEMBLY (Models WPES-10 and H-9518-1) - continued.
HOW TO READ TIRE WEAR
THE WAY TIRES WEAR IS A GOOD INDICATOR OF OTHER PARTS OF THE SUSPENSION. ABNORMAL WEAR PATTERNS ARE OFTEN
CAUSED BY THE NEED FOR SIMPLE TIRE MAINTENANCE.
EXCESSIVE WEAR AT THE CENTER OF THE TREAD INDICATES THAT THE AIR PRESSURE
IN THE TIRE IS TOO HIGH. THE TIRE IS RIDING ON THE CENTER OF THE TREAD AND
WEARING IT PREMATURELY.
THIS TYPE OF WEAR RESULTS FROM UNDER-INFLATION. WHEN A TIRE IS UNDER-
INFLATED. THERE TOO MUCH CONTACT WITH THE ROAD BY THE OUTER TREADS.
WHICH WEAR PREMATURELY. WHEN THIS TYPE OF WEAR OCCURS. AND THE TIRE
PRESSURE IS KNOWN TO BE CORRECT, A BENT AXLE OR OUT OF ADJUSTMENT WHEEL
BEARINGS COULD BE INDICATED.
FEATHERING IS A CONDITION WHEN THE EDGE OF EACH TREAD RIB DEVELOPS A
SLIGHTLY ROUNDED EDGE ON ONE SIDE AND A SHARP EDGE ON THE OTHER. BY
RUNNING YOUR HAND OVER THE TIRE. YOU CAN USUALLY FEEL THE SHARPER EDGES
BEFORE YOU'LL BE ABLE TO SEE THEM. THE MOST COMMON CAUSE OF FEATHERING
IS A BENT AXLE.
WHEN AN INNER OR OUTER RIB WEARS FASTER THAN THE REST OF THE TIRE. THE
NEED FOR WHEEL BEARING ADJUSTMENT IS INDICATED. THERE IS EXCESSIVE WEIGHT
ON ONE SIDE OF TRAILER. CAUSING THE WHEEL TO LEAN TOO MUCH. PUTTING
EXCESSIVE LOAD ON ONE SIDE OF THE TIRE. MISALIGNMENT COULD ALSO BE DUE
TO SAGGING SPRINGS. BE SURE THE VEHICLE IS LOADED EVENLY.
CUPS OR SCALLOPED DIPS APPEARING AROUND THE EDGE OF THE TREAD ALMOST
ALWAYS INDICATE WORN (SOMETIMES BENT) SUSPENSION PARTS. ANY WORN
COMPONENT THAT CONNECTS THE WHEEL TO THE SUSPENSION CAN CAUSE THIS TYPE
OF WEAR. OCCASIONALLY. WHEELS THAT ARE OUT OF BALANCE WILL WEAR LIKE
THIS. BUT WHEEL IMBALANCE USUALLY SHOWS UP AS BALD SPOTS BETWEEN THE
OUTSIDE EDGES AND CENTER OF THE TREAD.
SECOND-RIB WEAR CAN BE KEPT TO A MINIMUM BY PAYING CAREFUL ATTENTION
TO TIRE PRESSURE AND FREQUENTLY ROTATING THE TIRES. THIS IS OFTEN
CONSIDERED NORMAL WEAR.
MODELS WPES-10 AND H-9518-1
Change 1 2-75
