TM 9-2330-271-14&P
Table 4-1. Organizational Preventive Maintenance Checks and Services - Continued
Q=Quarterly
A=Annually
H=Hours
S=Semiannually
B=Biennially
MI=Miles
ITEM
INTERVAL
Item To
NO
Q S A B H MI
Be Inspected
Procedures
23
With rear of semitrailer blocked as in
item 22, inspect air spring for wear at
connection points. Check shock absorbers
for oil leakage or worn rubber
bushings. Check for wear resulting
from insufficient clearance around air
springs, shock absorbers, and tires.
AIR MOUNTED FIFTH
WHEEL KINGPIN
24
Check shock absorbers for oil leakage or
worn rubber bushings.
25
Inspect hinge bushings for wear.
Section VI. TROUBLESHOOTING
Table 4-2. Troubleshooting - Continued
4-13.
Scope
a. This
section
contains
troubleshooting
MALFUNCTION
information for locating and correcting most of the
TEST OR INSPECTION
operative troubles which may develop in the semitrailer.
CORRECTIVE ACTION
Each malfunction for an individual component, unit or
system is followed by a list of tests or inspections which
ELECTRICAL SYSTEMS - Continued
will help you to determine corrective actions to take. You
Step 4
Check to see that current is flowing from
towing vehicle.
should perform the tests/inspections and corrective
Check towing vehicle cables and circuit
actions in the order listed.
breakers.
b. This manual cannot list all malfunctions that
Step 5
Check wiring harness for short circuitl
may occur, nor all tests or inspections and corrective
Check cable for bare spots Repair if
necessary.
actions. If a malfunction is not listed or is not corrected
Step 6
Check light switch on towing vehicle.
by instead corrective actions, notify your supervisor.
Replace towing vehicle light switch if
c. Table 4-2 lists the common malfunctions which
defective.
you may find during the operation or maintenance of the
2.
ONE OR MORE 24-VOLT LAMPS WILL NOT LIGHT
semitrailer or its components.
Step 1
Inspect for burned out lamp.
Replace defective lamp (paragraphs 3-9
through 3-14).
Table 4-2. Troubleshooting
Step 2
Inspect for dirty or corroded cable contacts in
sleeves or lamp sockets.
MALFUNCTION
Remove lamps and clean contacts
TEST OR INSPECTION
Step 3
Check for broken or loose connections
Tighten, repair, or replace as necessary
CORRECTIVE ACTION
Step 4
Check to see if light assembly Is defective
Replace defective light assembly (paragraphs
ELECTRICAL SYSTEM
1.
ALL 24-VOLT LIGHTS FAIL TO OPERATE
Step 5
Inspect intervehicular cable for dirty or cor-
Step 1. Inspect intervehicular cable for proper con-
roded terminals
nection in all steps, check for loose ground
Clean receptacle and plug
connection
3.
DIM OR FLICKERING 24-VOLT LIGHTS
Connect cable properly. Tighten ground
Step 1
Clean to see If lamp is defective
Step 2 Inspect for dirty or corroded terminals in
Replace defective lamp (paragraphs 3-9
intervehicular cable
through 3-14).
Clean terminals in plug and receptacle
Step 2
Inspect for poor or loose ground connections
Step 3 Check to see that light switch on towing
Clean ground cable terminal and tighten
vehicle is in desired position
connections.
Place towing vehicle light switch in proper
Step 3
Inspect for loose, dirty, or corroded
mode of operation.
terminals
Clean and tighten terminals
4-10
