PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —140— 22-01691 (R02/02)
Air Dryer
Every 900 operating hours or 30,000 miles/48,000 km or 3 months,
check for moisture in the air brake system by opening reservoirs,
drain cocks, or valves and checking for the presence of water. A table-
spoon of water in a reservoir would point to the need for a desiccant
cartridge change. However, the following should be considered first:
• Air usage is exceptionally high/abnormal for a highway vehicle.
This may be due to accessory air demands or some other unusual
air requirement that doesn’t allow the compressor to load/unload
in a normal fashion or it may be due to excessive leaks in the air
system.
• When more than a 30-degree F (17-degree C) range of tempera-
ture occurs in one day, small amounts of water can accumulate in
the air brake system due to condensation. Under these condi-
tions, the presence of small amounts of moisture is normal and
should not be considered as an indication that the dryer is not per-
forming properly.
• An outside air source may have been used to charge the air sys-
tem, in which case this air did not pass through the drying bed.
Transmission And Drive Train
Clutch Adjustment
Clutch pedal free travel is usually 1 3/4 in. to 2 in. (34 to 51 mm). This
should be your guide for determining whether your truck needs clutch
adjustment. Some vehicles have automatic clutch adjustment. If
yours doesn’t have this feature, adjustment will have to be done by a
trained certified mechanic. Have the adjustment done before clutch
pedal free travel is reduced to the minimum allowable 1/2 in. (13 mm).
NOTE: A small amount of oil in the system may be normal and
should not, by itself, be considered reason to replace a desic-
cant cartridge; oil-stained desiccant can function adequately.
To Next Page
Loading...
