Platen Maintenance. Graco 3A5379B, Electric Supply System for Sealants and Adhesives

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Platen Maintenance. Graco 3A5379B, Electric Supply System for Sealants and Adhesives | Manualzz

Maintenance

Platen Maintenance

See F IG . 14. If the platen does not come out of the pail easily when the pump is being raised, the air assist tube

(AT), or check valve may be plugged. A plugged valve prevents air from reaching the underside of the plate to assist in raising it from the pail.

1. Perform the Pressure Relief Procedure on page

14.

2. Refer to the parts illustration on page 43 and disas semble the air assist valve as shown.

3. Clear the air assist tube (AT) in the platen. Clean all parts of the valve and reassemble.

4. Remove the bleed stick (BS) from the platen. Push the bleed stick through the bleed relieve ports to remove material residue.

Adjust Spacers

Use Platen with Tapered and Straight Sided Pails

The platen is supplied for use with 20 liter (5 gallon), 30 liter (8 gallon), and 60 liter (16 gallon) straight sided pails, but only single wiper platens can be easily modi fied for use with tapered pails.

Use platen with tapered pails

1.

Working from the bottom , use a screwdriver to pry the spacer (EG) loose. Work the spacer upward completely above the flange of the platen. See F IG .

15.

2. By hand, angle the spacer (EG) and work it off the plate, pulling it down over the flange and bottom wipers (EB). See F IG . 16.

3. Save the spacer (EG), as it is required for other applications.

1 To use Model 255655 platens with tapered pails, the spacer

(EG) must be removed.

BS

BS

EG

AT

EG r_255468_313527_33a

F IG . 15

EB r_255468_313527_30a

F IG . 14

3A5379B 17

Maintenance

Use platen with straight sided pail

1. Ensure the large diameter of the spacer (EG) is fac ing down.

Work the spacer (EG) up over the platen by hand completely above the flange of the platen.

See F IG . 16.

2.

Working from the top , use a screwdriver to position the spacer (EG) between the flange and wipers

(EB). See F IG . 17.

EB

F IG . 16: Sliding spacer

EG r_255468_313527_30a

Remove and Reinstall Wipers

Disassemble 20, 30, and 60 Liter Wiper Assemblies

1. Remove the wiper assembly; see F IG . 18: a. For all single wiper platens: Remove the two clips (470) with needle nose pliers and remove the platen cover (469).

b. Remove the eight nuts (459) that hold the wiper assembly to the platen casting (451) and remove the wiper assembly.

c. See Reassemble 20, 30, and 60 Liter Wiper

Assemblies to change wiper sizes, styles, or a complete wiper assembly.

2. Remove the eight nuts (459) on the wiper assembly.

3. Separate the top plate (457), spacer (452), wiper(s)

(453), wiper support (454), and bottom plate (455).

4. Clean, inspect, and replace worn components.

EG

EB

F IG . 17: Installing Spacer r_255468_313527_32a

18 3A5379B

Reassemble 20, 30, and 60 Liter Wiper Assemblies

1. Assemble the wiper assembly.

a.

For single wiper assemblies : Place the bottom b.

plate (455) on a flat surface. Place the wiper support (454), wiper (453), spacer (452), and top plate (457) on the bottom plate (455).

For single wiper assemblies with SST platens

Place the bottom plate (455) on a flat surface.

Place the wiper support (454), wiper (453), flow ered wiper support (460), PTFE spacer (452), and top plate (457) on the bottom plate (455).

Single Wiper Platen

470

469

459

462

:

-

Maintenance c.

For double wiper assemblies : Place the bottom plate (455) on a flat surface. Place the wiper support (454), wiper (453), spacer (452), wiper

(453) and top plate (457) on the bottom plate

(455).

d. Install eight nuts (409) on the outer ring. Torque to 45 in-lbs (61 N•m).

e. Replace the o-ring (456), or install a new o-ring under the platen casting (451). Use lubricant to hold in place.

f.

Install the platen casting (451). Tighten with four nuts (509).

461

Single Wiper with

SST Platen

470

469

459

462

461

Double Wiper Platen

459

451

456

459

462

465

456

456

459

457

465

451

457

465

451

459

457

453

452 452

452

460

453

453

453

454

454

454

455

455

455

F IG . 18: Single and Double Wiper Assemblies

3A5379B 19

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