Technical data

20 309030
Service
Items Needed for Service
 1/16 in. Hex Wrench – provided
 Adjustable Wrench
 Pliers
 Lubricant part no. 111265; see Accessories, page
28, to order
 Compatible Solvent
Fluid Packings Replacement
WARNING
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 13 before
checking or repairing any part of the gun or sys-
tem.
NOTE:
 Air Section Repair Kit 241698 and Fluid Section
Repair Kit 241699 are available. Purchase the kits
separately.
1. Relieve the pressure.
2. Unscrew the four screws (13) and remove the gun
from the manifold.
3. Remove the air cap retainer (25) and air cap (24).
See Fig. 13.
4. Trigger the gun while you remove the fluid nozzle
(23) with the wrench.
CAUTION
Trigger the gun whenever you tighten or remove the
nozzle. This keeps the needle seat away from the
nozzle seating surface and prevents the seat from
being scratched.
23
24, 25
9397A
Fig. 13
5. Remove the piston cap (4) from the piston housing
(1). Remove the springs (6, 7).
6. Using a 1/16 in. hex wrench loosen the fluid needle
set screw (30). Remove the needle stop (29).
7. Pull the fluid needle (5) out the back of the gun.
8. Check the fluid needle (5) for damage or excessive
wear. Replace the needle tip (5a) or the entire
needle if necessary.
9. Unscrew the four screws (14) and separate the
fluid housing (2) and the piston housing (1). Re-
move both the gaskets (12, 15).
10. Remove the packing nut (16) with a wrench.
11. Remove the fluid packing (17) from the nut (16).
Discard the old fluid packing.
12. Using a pliers, pull the piston (3) out of the piston
housing (1).
13. Remove all o-rings from the piston (3) and stems
(T). Check that the stems are solidly in place. If
they are loose, replace the entire piston assembly
(3).
14. Perform the following applicable step:
a. Non-circulating guns: Remove the fluid outlet
port plug (19), and gasket (22) from the fluid
housing (2). Remove the o-ring (21) and
backup (20) from the plug.
b. Circulating guns: Remove the gasket (22) from
the fluid housing (2).
15. Clean all parts and replace any worn parts. When
assembling, lubricate the threads with anti-seize
lubricant.