Instruction Manual

DG-1000 Dispenser

1998 Nordson Corporation

107 156C

Issued 11/98

Manual 12-35

See Figure 6.

1.Insert the needle (7) through the seal in the upper body (8) and the

internal seal in the lower body (9). The needle is properly seated

when the needle ball is almost flush with the end of the heater

extension.

2.To properly seat the piston in the piston insertion tool (4), roll the seal

lip (5) of the new air piston (6) on a clean flat surface. The seal lip

must be formed so that the lip hangs down toward the dispenser.

3.Coat the seal area of the piston insertion tool (4) with Parker O-ring

lubricant or equivalent. Install the piston assembly into the insertion

tool. Make sure the entire assembly fits into the tool.

4.Make sure that the seal lip (5) is round. No gaps or folds can be

between the piston insertion tool (4) bore and the seal lip. Replace

the air piston, if necessary.

5.Place the piston insertion tool (4), piston side down, on a flat surface.

6.Lubricate the O-ring (3) with Parker O-ring lubricant or equivalent.

Install the O-ring in the groove of the chamfered end of the seal lock

nut (2).

7.Lubricate the air piston (6) with Parker O-ring lubricant or equivalent.

Press the seal lock nut (2) into the top of the piston insertion tool (4)

and into the air piston. You must apply pressure to insert the seal

lock nut and make it secure.

8.Place the piston insertion tool (4) onto the top of the needle (7). Turn

the piston insertion tool clockwise, applying downward pressure on

the needle. Thread the seal lock nut (2) onto the needle (7) until the

lip of the tool seats in the chamfer on top of the upper body (8).

9.Continue winding the air piston (6) into the bore until the tool

disengages from the seal lock nut. See Figure 7. The top of the seal

lock nut should be flush to within 0.010 in. above the top of the upper

body(8).

10.See Figure 6. Pull up on the needle approximately

in. Do not pull

the air piston(6) out of the bore.

Air Piston