Tadano TR-800XXL4, Service Manual

Page: 297 / 402

T - 5 T - 5
Air Dryer
32
W232-0032E
3. Precautions for handling
[NOTICE]
Be certain to use the desiccant specified by
NABCO (part No. 41213640010), and replace it with
an amount that is within the specified range.
Use of a desiccant other than that specified, or in
amounts less than those specified, will not only
reduce the moisture-absorption capability of the
dryer, but can lead to degradation and loss of the
desiccant and can greatly increase the likelihood of
vehicle malfunctions.
Be aware that the desiccant used in DU-3 is of a
different type than the desiccant used in DR-41,
DR-42, and DU-4.
Be sure to perform tapping when inserting the
desiccant.
1. If the vehicle has been parked for several hours in
a cold location (-10°C (14°F) or below), wait at
least 10 minutes before driving after starting the
engine. (It takes time for the temperature to rise
after the heater turns ON.)
2. Make sure that the unload time is 50 seconds or
longer.
(If the regeneration process is not performed, the
moisture-removal capability of the desiccant is
decreased, and the dryer function is lost.)
3. During unloading, air is continuously discharged
from the air dryer exhaust port.
This is normal, and is not a problem of air
leakage.
4. Replace the desiccant every 1 year or 100,000 km
(62140mi) of travel, whichever occurs sooner.
5. If drainage occurs from the air tank, disassemble
the dryer, and replace the desiccant if 1/5 or more
of the total desiccant is seeped in oil.
(If the desiccant becomes seeped in oil, its ability
to absorb moisture is decreased. Because this
greatly affects dryer function, be sure to replace
the desiccant if this occurs.)
4. Maintenance and inspections
4.1 Daily inspection
1. Check for air leakage around the body, at pipe
openings, and other locations.
2. To check that the air dryer is operating normally,
open the drain cock on the air tank, and check
that there is no drainage.
(A small amount of drainage may accumulate if
the temperature around the air tank has
decreased by more than 17°C (62.6°F)).
3. In cases other than the above (drainage resulting
from temperature change), if a small amount of
drainage occurs, check the precautions for
handling again.
[NOTICE]
If the desiccant becomes seeped in oil or other
substance, its ability to absorb moisture is
decreased. Because this greatly affects dryer
function, be sure to replace the desiccant if this
occurs.
It is recommended that you replace the filter at the
same time as the desiccant.
4. If no abnormalities are found, disassemble the air
dryer and check whether or not the desiccant is
seeped in oil or other impurities. If 1/5 or more of
the total desiccant is seeped in such substances,
replace the desiccant.
[NOTICE]
◆
Oil (liquid oil and carbonized oil) is contained in the
compressed air that enters the air dryer. This will
accumulate in the compressor and dryer piping, and
inside the dryer itself. Because this oil may burn, be
sure to perform cleaning periodically.
5. Pay attention to the drainage from the air dryer
exhaust port. If an abnormal amount of oil is
drained, inspect the compressor and take steps to
prevent increases in the amount of oil.
Never touch the desiccant with wet hands, or
put the desiccant in your mouth. Doing so will
cause heating of the desiccant, and can result in
burns.
WARNING
When performing inspections, use caution to
prevent dirt from entering the eyes.
WARNING