Graco 24M178 User Manual

Maintenance and Repair

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.

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.

288810 Silica Gel (5 lb)

Blue

Pink

288823 Silica Gel (four 5 lb 
cans)

Blue

Pink

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