Manitowoc Published 11-06-15, Control # 040-13 2-33
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
c. Install three o-rings (5, 6, and 7) on purge valve
housing placing each in its appropriate location. If
the exhaust cover (30) was removed during
disassembly, install it on the purge valve housing
making certain the bubble portion is positioned over
the thermostat. Install the assembled purge valve
housing in the end cover making certain to orient
both parts such that the connector is approximately
10 degrees clockwise from the supply port, while
making certain the purge valve housing is fully
seated against the end cover. Secure the purge
valve housing to the end cover using the three self-
tapping screws (3). Start all three screws by hand
then torque to 50 to 80 in/lbs (5,6 to 9 Nm).
2. Install the o-ring on the check valve (15), then install the
check valve in the end cover.
3. Install the desiccant cartridge o-ring (21) in its groove in
the end cover. Using a light coat of barium grease,
lubricate the bottom of the desiccant cartridge in the
area that will contact the o-ring (21) and end cover.
Screw the desiccant cartridge into the end cover until
contact is made between it and the o-ring.
4. Using a strap or chain wrench positioned 2 to 3 in (50.8
to 76,2 mm) from the bottom of the cartridge, turn the
desiccant cartridge clockwise 180 to 225 degrees
beyond the position where initial contact was made
between the cartridge and end cover o-ring.
Torque should not exceed 50 ft/Ibs (68 Nm).
5. Install the end cover outer housing o-ring (23) on the
shoulder in the end cover. Place the housing (24) over
the desiccant cartridge and align the holes. Install the six
cap screws (16), lock nuts (19) and twelve special
washers (17) making certain they are in the proper
position as marked during disassembly. The two longer
cap screws (18) will be used to secure the air dryer to
mounting bracket.
Tighten the six cap screws and nuts in a star pattern,
depending on lower bracket location. Torque 270 to 385
in/lbs (31 to 44 Nm)
NOTE: The two remaining bolt holes in the end cover and
two cap screws must be the ones marked during
disassembly to assure proper orientation of the
ports and adequate length of the cap screws.
6. Install the assembled air dryer back onto the crane by
slipping it into the upper mounting bracket. Align the two
unused holes in the end cover with the bottom mounting
bracket such that the bottom bracket 9 supports air
dryer. The AD-9 end cover should rest on the bracket.
Using the remaining two cap screws (I8), four special
washers (17), and two lock nuts (19), secure the air
dryer to the lower bracket. Tighten, then torque the two
remaining cap screws to 270 to 385 in/lbs (31 to 44 Nm).
7.
Tighten the bolt (25) and nut (29) on the upper mounting
bracket. Torque to 80 to 120 in/Ibs (9 to 14 Nm).
8. Reconnect the three airlines to the proper ports on the
end cover (identified during disassembly).
9. Reconnect wiring harness to the air dryer heater and
thermostat connector by plugging it into the air dryer
connector until its lock tab snaps in place.
10. Before placing crane back into service, perform the
Operation and Leakage Tests above.
Preventive Maintenance
Maintenance intervals will vary depending on crane
operation.
Every 500 operating hours or every three
months
1. Check for moisture in the air brake system by opening
reservoirs, drain cocks, or valves and checking for
presence of water. If moisture is present, the desiccant
may require replacement. The following conditions can
also cause water accumulation and should be
considered before replacing the desiccant:
a. An outside air source has been used to charge the
system. This air did not pass through the drying bed.
b. Air usage is exceptionally high and not normal for a
crane. This may be due to accessory air demands
or some unusual air requirement that does not allow
the compressor to load and unload (compressing
and non-compressing cycle) in a normal fashion.
Check for high air system leakage.
c. The air dryer has been installed in a system that has
been previously used without an air dryer. This type
system will be saturated with moisture and several
weeks of operation may be required to dry it out.
d. Location of the air dryer is too close to the air
compressor.
e. In areas where more than a 30 degree range of
temperature occurs in one day, small amounts of
water can accumulate in the air brake system due to
condensation. Under these conditions, the
presence of small amounts of moisture is normal
and should not be considered as an indication that
the dryer is not performing properly.
NOTE: A small amount of oil in the system may be normal
and should not, in itself, be considered a reason to
replace the desiccant. Oil stained desiccant can
function adequately.
2. Check mounting bolts for tightness. Torque 270 to 385
in/lbs (31 to 44 Nm).
3. Perform the Operation and Leakage Tests listed in this
section.
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