Graco 3A0021C Manual de usuario descargar pdf (Pagina 5)

Repair

3A0021C 5

7. Place a cloth over the hydraulic ports (P). Use a rub-

ber mallet to tap piston rod assembly (6) out of cylin-

der (1).

8. Clamp piston rod flats (6) in a vise to prevent dam-

age to the piston rod.

9. Use o-ring pick to remove sealing ring and rubber

energizing ring of bidirectional seal (6b). Remove

bearing (6c).

10. Thoroughly clean all metal parts in a compatible sol-

vent and inspect for wear or damage. Replace as

necessary.

Assembly

1. Clamp piston rod (6) flats or hex in a vise to prevent

damage to the piston rod.

2. Lubricate piston lead-in (L) of piston with hydraulic

oil to ensure rubber energizing ring of bidirectional

seal (6b) seats properly. Install one edge of rubber

energizing ring in deep piston groove and press the

rest of the rubber energizing ring down while pre-

venting the ring from twisting.

3. Install sealing ring of bidirectional seal (6b) over rub-

ber energizing ring and install bearing (6c).

4. Remove piston assembly (6) from vise and apply

grease to seals.

5. Apply a light amount of hydraulic oil on the inside of

the cylinder (1) to allow easy installation of the pis-

ton assembly (6). Continue to next step if the cylin-

der hasn’t been flushed and there is residual

hydraulic oil.

Residual hydraulic oil in the cylinder can spray out of

ports during removal of the piston assembly.

NOTICE

To avoid damaging the piston rod, do not clamp

piston rod surface.

r_257909_3A0021_7h

Do not clamp vise on this surface.

r_257909_3A0021_8h

flats

NOTICE

To avoid damaging the piston rod, do not clamp

piston rod surface.

NOTICE

Only expand the sealing ring of bidirectional seal

(6b) and bearing (6c) as much as needed to fit

over the piston. Damage will occur when the seal-

ing ring or bearing are opened wider than neces-

sary.

r_257909_3A0021_8h

r_257909_3A0021A_1_10

apply

hydraulic oil

1 2 3 4 5 6 7 8 9 10

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