TRUCK SERVICE MANUAL
BRAKES-AIR
4. Observe extreme care when welding near nylon
SERVICE CHECKS
tubing. Hot slag or spark will damage the tubing.
Operating Tests
5. Protect nylon tubing from battery acid.
If any evidence is found that an air line is restricted,
The service nylon tubing will be marked at regular
remove and blow out through it in both directions to be
intervals with name, number, type, size and
sure the passage through the tubing is not obstructed in
manufacturing code designations.
This marking is
any way. Inspect piping for partial restrictions such as
intended to positively identify the tubing and prevent
may be caused by dents or kinks. Damaged pipes must
substitution of inferior quality tubing.
be replaced.
MAINTENANCE
Leakage Tests
With the air system fully charged, the governor cut
Every six months all air connections should be
out and brakes applied, use SE-2326 Leak Detector
checked and tightened if leaking (refer to SERVICE
Tester at air lines and fittings to check for leakage. No
CHECKS). Once each year all tubing and hoses should
leakage is permissible. Leakage at a tubing fitting is
be inspected for dents, kinks, chafing or crimping.
sometimes corrected by tightening the fitting nut. If this
Replace tubing if these conditions are found.
fails to correct the leakage, replace the tubing, sleeve or
fitting, the tubing or hose.
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