TM 9-2330-271-14&P
Table 4-2. Troubleshooting - Continued
Table 4-2. Troubleshooting - Continued
MALFUNCTION
MALFUNCTION
TEST OR INSPECTION
TEST OR INSPECTION
CORRECTIVE ACTION
CORRECTIVE ACTION
AIR SUSPENSION - Continued
2.
JACK FOOT PLATE WILL NOT SET ON BASE
Step 2. Check air spring for leaks or wear.
Step 1. Check foot plate
Replace air spring
Replace bent foot plate
5.
AIR SPRING BLOWN OUT
TANDEM SUSPENSION SYSTEM
Step 1. Check for excessive wear, puncture or cut
1.
PULLING TO LEFT OR RIGHT
Replace air spring
Step 1. Check for dragging brakes
Step 2. Check if tires or rims are rubbing air spring
Align wheel properly.
Step 2. Check for improper wheel bearing
Step 3. Check for continual or repeated over-
adjustment
extension of air spring
Adjust height control valve Replace shock
Step 3 Check for loose suspension springs
absorber if broken Replace broken upper
Tighten U-bolt nuts
shock mount bracket
2.
EXCESSIVELY WORN, SCUFFED, OR CUPPED TIRES.
Step 4. Check for proper adjustment of height control
Step 1. Check for improper tire pressure
valves.
Step 2. Check for loose wheels
Tighten wheel nuts.
6.
TORSION BAR BREAKAGE
Step 1. Check adjustment of height control valves.
Step 4. Check for deformed wheel or rim.
Step 2. Check axle connections for looseness
Step 5. Check for deformed brake drum.
Tighten U-bolt nuts to proper torque limits
7
WEAR OF TORSION BAR RUBBER BUSHING
AIR SUSPENSION SYSTEM
Step 1. Check for torsional preload in bushing.
1
ALL AIR SPRINGS ARE FLAT.
Loosen clamp bolts and retighten with suspension
Step 1 Check for sufficient air pressure
Build up towing vehicle air pressure to 65 psi
AIR MOUNTED FIFTH WHEEL KINGPIN
1.
AIR SPRINGS FLAT.
Step 2. Check for poor coupling connections
Step 1. Check air pressure of system
Build up towing vehicle air pressure to 65 psi.
Step 3 Check air lines for breaks or leaks
Step 2 Check for poor coupling connection
Repair or replace.
2
AIR SPRINGS FLAT ON ONE SIDE OF TRAILER ONLY
Step 3. Check air lines for leaks or breaks
Step 1. Check height control valves adjustment
Repair or replace.
Adjust valve to proper dimensions (para-
2.
UNLEVEL CONDITION WHEN FULLY INFLATED.
graph 4-56b)
Step 1. Check air spring for blowout or leaks
Step 2 Check air spring for severe leak or blowout
Step 2. Check air lines for leaks or breaks
Step 3. Check height control valve for defect
Repair or replace.
Replace height control valve.
3.
SYSTEM DEFLATES RAPIDLY WHEN PARKED
Step 4 Check height control valve linkage for breaks
Step 1. Check air lines for leaks or breaks
or bends
Repair or replace
Repair or replace linkage
Step 2. Check air spring for leaks
Step 5 Check air line for leak or break
Repair leak or replace line
4.
AIR SPRING BLOWN OUT
3
SEMITRAILER LEANS.
Step 1. Check air spring for wear, cuts and
Step 1 Check height control valve adjustment or
punctures.
malfunction.
Adjust or replace height control valve.
Step 2. Check if semitrailer operated extensively
Step 2 Check air spring for severe leak or blowout
with low or no air in springs.
isolate and correct condition Replace air
Step 3 Check air lines for leaks
Repair air line leaks
Step 3. Check for continual or repeated over-
4
SUSPENSION DEFLATES RAPIDLY WHEN PARKED
extension of air spring
Step 1 Check air lines for leaks.
Locate and repair leak.
or replace shock absorber, if broken (para-
graph 4-59c and d)
4-13