Tadano TR-800XXL4, Service Manual

Page: 294 / 402

T - 5 T - 5
Air Dryer
29
W232-0032E
2. Function
1. When the air pressure at the air dryer outlet port
(air tank air pressure) reaches the specified
release pressure, this governor sends that
pressurized air to the control port, opening the air
dryer drain valve.
2. When the air pressure at the air dryer outlet port
has dropped to the specified intake pressure, the
pressurized air at the control port is released to
the atmosphere, closing the drain valve.
2.1 Dehumidification
1. During the compressor load cycle, the air from the
compressor enters the air dryer inlet port. The
compressed air is cooled down as it flows along
the body walls. This results in moisture and oil
accumulating at the bottom of the body.
2. The air flows through a filter which includes an oil
mist separator, which removes minute oil droplets
and dust before the air enters the drying tube.
3. In the drying tube, the moisture in the air is
removed by a desiccant that has a strong affinity
for water.
4. As the air proceeds from the bottom of the drying
tube to the top, it contacts a stronger desiccant,
which further reduces the moisture. When the air
reaches the top of the drying tube, it is dry air.
5. This dry air passes through the check valve and
purge chamber at the top of the drying tube, and
is supplied to the governor chamber and main
tank via the outlet port check valve.
Inlet
Main tank
Check valve
Compressor
Purge chamber
Oil filter
Outlet
Governor
Desiccant
IW232-0030E06