User's Manual

ManualsBrandsGraco ManualsTVs & monitors309962H

309962 13

Service

Adjusting the Spring Tension

WARNING

SKIN INJECTION HAZARD

To reduce the risk of a serious injury,

including fluid injection, follow the

Pressure Relief Procedure on page 7

whenever you are instructed to relieve the

pressure.

NOTE: Items in ( ) refer to items in the PARTS list

(pages 14-17).

1. Relieve the pressure in the system.

NOTE: For models with switch (42); cover (43) must

be removed and the switch must be removed.

2. Loosen lock nut (13).

3. Adjust the spring retainer (39) to the desired

trigger pull force.

4. Tighten lock nut (13) to secure spring tension

adjustment.

Servicing Valve Stem and Seal

If fluid leaks past seal (15c), the seal or needle (15a)

may be worn or damaged. To replace the seal or valve

stem, follow the procedure below.

WARNING

SKIN INJECTION HAZARD

To reduce the risk of a serious injury,

including fluid injection, follow the

Pressure Relief Procedure on page 7

whenever you are instructed to relieve the

pressure.

1. Relieve the pressure in the system.

2. Disconnect the gun from the hose.

NOTE: For models with switch (42); cover (43) must

be removed and the switch must be removed.

3. Loosen lock nut (13).

4. Unscrew the spring retainer (Item 39).

5. Using a 1/2 in. and 11/32 in. wrench, loosen hex

nut (Item15m).

6. Remove nozzle (19), cap (5), and shield (4).

7. Trigger gun and, using a screwdriver in the slot of

the needle (15a), turn the needle clockwise several

turns.

8. While holding the yoke (15g), turn needle (15a)

counterclockwise until it separates.

9. Remove the front half of the needle assembly

(15a) from the gun.

10. Remove and replace packing support (15b),

needle seals (15c), and O–ring packing (15d).

11. Install the front half of the needle assembly in the

body (1)

12. While holding yoke (15g), install the needle (15a),

rotating clockwise.

13. Adjust the needle as described in Adjusting the

Needle Assembly on page 12.

14. Install shield (4), cap (5), and nozzle (19).

15. If necessary, adjust spring tension as described in

Adjusting the Spring Tension on this page.