Graco Inc. Glascraft GC-1388G User Manual download pdf (Page 17)

17GC-1388F

21222-00

20507-00

(Retainer)

If Packing, P/N 20507-00 and Packing Disks,

P/N 20508-00 are removed from Needle and Pack-

ing Housing, GlasCraft recommends that these

parts always be replaced with NEW packings and

packing disks.

1. Ensure spring is seated on needle shoulder.

2. Insert needle into the packing housing .

3. Lubricate a teon packing disk with red lube

and slide into housing.

4. Lubricate the retainer with red lube and slide it into

the housing with the at side entering the housing

rst. (Concave side entering the housing last).

5. Lubricate the remaining (4) teon disc and slide

them into the housing.

6. a. Lubricate the tip of the packing nut, screw it into

the housing and hand tighten until it stops.

b. use a 3/8in. wrench on packing nut and a 9/16in.

wrench on the packing housing and tighten 1/16 to

1/4 turn.

c. back off then tighten a little more.

d. back off then tighten a little more.

e. back off then snug tight until you hear a “POP”.

Needle Test

1. Put the tip of the needle on a hard surface and press

down on the assembly to compress the spring. Release

the assembly and the needle should return to it’s origi-

nal position.

2. Turn the assembly over and place the back end of the

needle on a hard surface and press down until it stops.

Lift up on the spring and lock inside the housing to

ensure that the seal has extruded through the hole and

surrounds the needle as shown.

Maintenance

Isocyanate Conditions

Rev. G 6/17/2008 21

Isocyanate Conditions

Material Self-ignition

Moisture Sensitivity of

Isocyanites

Isocyanites (ISO) are catalysts used in two component

foam and polyurea coatings. ISO will react with moisture

(such as humidity) to form small, hard, abrasive crystals,

which become suspended in the fluid. Eventually a film

will form on the surface and the ISO will begin to gel,

increasing in viscosity. If used, this partially cured ISO

will reduce performance and the life of all wetted parts.

To prevent exposing ISO to moisture:

• Always use a sealed container with a desiccant

dryer in the vent, or a nitrogen atmosphere. Never

store ISO in an open container.

• Keep the ISO lube pump reservoir (if installed) filled

with Graco Throat Seal Liquid (TSL), Part 206995.

The lubricant creates a barrier between the ISO and

the atmosphere.

• Use moisture-proof hoses specifically designed for

ISO, such as those supplied with your system.

• Never use reclaimed solvents, which may contain

moisture. Always keep solvent containers closed

when not in use.

• Never use solvent on one side if it has been contam-

inated from the other side.

• Always lubricate threaded parts with ISO pump oil

or grease when reassembling.

Keep Components A and

B Separate

Foam Resins with 245 fa

Blowing Agents

Some foam blowing agents will froth at temperatures

above 90°F (33°C) when not under pressure, especially

if agitated. To reduce frothing, minimize preheating in a

circulation system.

Spraying materials containing isocyanates creates

potentially harmful mists, vapors, and atomized partic-

ulates.

Read material manufacturer’s warnings and material

MSDS to know specific hazards and precautions

related to isocyanates.

Prevent inhalation of isocyanate mists, vapors, and

atomized particulates by providing sufficient ventila-

tion in the work area. If sufficient ventilation is not

available, a supplied-air respirator is required for

everyone in the work area.

To prevent contact with isocyanates, appropriate per-

sonal protective equipment, including chemically

impermeable gloves, boots, aprons, and goggles, is

also required for everyone in the work area.

Some materials may become self-igniting if applied

too thickly. Read material manufacturer’s warnings

and material MSDS.

The amount of film formation and rate of crystalli-

zation varies depending on the blend of ISO, the

humidity, and the temperature.

NOTICE

To prevent cross-contamination of the equipment’s

wetted parts, never interchange component A (isocy-

anate) and component B (resin) parts.

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