Repair 7-7 1997 Nordson CorporationAll rights reserved 106 915CIssued 11/97Manual 21-27The assembly procedure for the WM-1 spray gun is described here.To assemble the packing cartridge and fluid needle into the extension,perform the following steps:1. See Figure 7-5. Lubricate and install the O-ring (6) onto the packingcartridge assembly (7).CAUTION: Do not overtighten parts. Failure to observe thisprecaution will result in equipment damage.2. Apply thread adhesive to the fluid needle (2) threads. Install thefluid needle (2) on the cartridge assembly. Do not overtighten.3. Lubricate and install the O-ring (4) on the packing cartridge body (5).4. Apply a thin film of dielectric grease (13) around the spring/bellowsarea of the packing cartridge assembly (7).5. Thread the packing cartridge body (5) onto the packing cartridgeassembly (7). Do not overtighten.6. Slide the spring seal (3), lip or open side out, onto the fluid needle (2).Use the narrow end of the spacer (9) to press the seal into thepacking cartridge body (5).7. Apply a thin film of dielectric grease (16) to the outside surface of theassembled packing cartridge. Insert the cartridge into theextension (1).8. Insert the gasket (8) into the spacer (9). Apply a thin film of dielectricgrease (15) to the outside surface of the spacer. Slide the spacer intothe extension (1).9. Insert the shaft seal (10), lip or open side out, into the packingcartridge retainer (11). Apply a thin film of dielectric grease (14) tothe outside surface of the retainer. Thread the retainer into theextension (1). Secure the retainer using the Nordson wrench.10. Push the puller (12) through the packing cartridge retainer (11).11. Thread the puller (12) onto the packing cartridge assembly (7).Further adjustment may be necessary after the trigger is installed.Refer to Final Assembly for the trigger adjustment procedure.3. AssemblyPacking Cartridge and FluidNeedle