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Maintenance and Repair
309921N 9
Desiccant Housing 234404,
Series B
Desiccant Changeout
The desiccant gradually changes color from blue to pink,
indicating it has absorbed moisture to the saturation
point and needs to be regenerated or replaced.
• To regenerate Silica Gel desiccant, heat desiccant
for 4 hours at 275°F (135°C).
• To replace desiccant, order desired part no. from the
following chart.
Desiccant Housing Disassembly
1. Follow the Pressure Relief Procedure, page 8.
2. Unscrew the metal collar holding the desiccant bowl
to cover. Remove bowl and collar.
3. Dump old desiccant out of bowl.
4. If the pressure drop across the dryer has become
unacceptable, the bronze element in the bottom of
the bowl may be clogged. To remove clog:
a. Place a blow gun at the top of the tube and blow
air through the flow tube.
b. If element replacement is needed: disassemble
flow tube from the bowl by removing the end
cap and nut from the bottom of the bowl.
c. Turn the flow tube (hand tight) counter clock-
wise to remove it, then replace elements.
d. Reassemble in reverse order.
5. Refill bowl with new or regenerated desiccant. See
Desiccant Changeout. Desiccant Housing 234404
holds 5 lb. of desiccant.
6. Reassemble bowl to cover, making sure that o-ring
289186 is in place in cover.
NOTE: Always install a moisture filter, to remove
bulk fluids, and a coalescing filter, to remove oil,
upstream of the desiccant housing. Desiccant
coated with oil will not absorb moisture.
NOTE: Desiccant beads are non-toxic and
non-flammable.
Desiccant Part No.
Color
when fresh
Color when
saturated
288810 Silica Gel (5 lb)
Blue Pink
288823 Silica Gel (four 5 lb
cans)
Blue Pink
Part No. Description
288793 Flow Tube Assy., includes flow tube, nut,
o-ring, filter elements and retainers
289186 O-Ring
288794 Gasket
289189 O-Ring
289187 Filter Element
289188 O-Ring
288795 Sight Glass
288810 Desiccant, silica gel (5 lb)
288823 Desiccant, silica gel (four 5 lb cans)
289189
288794
288793
288795
289186
289187 (2)
289188