the present invention generally relates to a hot molten adhesive application machine . more specifically the present invention discloses a unique hot melt adhesive application machine having a novel construction whereby the reservoir of molten adhesive material is heated from within the molten adhesive . the adhesive pump , discharge hoses , and discharge applicators are heated by electrical resistance heating elements that may operate on 120 or 240 volt current . further , a novel axial pump piston is disclosed whereby the pump cylinder bore may be machined to a lessor tolerance standard than previous pumps of this type .