a fitting spacer 43 is machined to a thickness which will position the pitch line of the rack lubricator gear assembly 37 approximately 0 010 inch above the pitch line of the rack 17 so the assembly 37 will rotate freely as a the rack lubricator 20 traverses the rack length the rear end of the shaft 30 has a counter bore 46 which receives a rotary seal 47 a central hole 48 is interdrilled from the counter bore 46 axially to the gear mounting diameter 34 of the shaft 30 where it intersects a cross drilled hole 49 extending through the diameter 34 a manifold cap 50 is mounted to the rear surface 51 of the rack lubricator housing 23 and has an outer diameter 52 which is bolted to the housing 23 by cap screws 53 a pilot diameter 54 extends into the bearing bore 25 of the housing 23 and the pilot diameter 54 has a face relief 55 terminating at a reduced central pilot diameter which extends from the relief 55 of the cap 50 through the seal 47 of the shaft 30 a central hole 57 is drilled through the cap 50 axially in line with the central hole 48 of the shaft 30 the pilot diameter 54 is tapered slightly at its leading edge to provide smooth entry into the shaft seal 47 the outer face 58 of the manifold cap 50 has a pipe tapped hole 59 which receives the fluid hose 21 depicted in.