for ball bearing 40 rotating on cam 38 to return the depressed piston formed in part by stroke adjuster 44 drive shaft 46 and plunger 60 stroke adjuster 44 serves as a first contact point for maintaining the horizontal alignment of carriage assembly 36 in conjunction with the second point of contact provided by carriage bearing 34 stroke adjuster 44 also depresses drive shaft 46 and plunger 60 when contacted by ball bearing 40 and cam 38 stroke adjuster 44 and stroke adjuster nut 48 allow for control of stroke length drive shaft 46 connects to and transfers linear motion to plunger 60 sleeve bearing 50 supports and directs the motion of drive shaft 46 drive cylinder mating component 52 fastens drive cylinder 54 to drive housing 30 set screws 56 secure drive cylinder 54 to fluid cylinder 78 dust cover 58 provides a protective barrier over a portion of drive cylinder 54 regarding pump section 16 plunger 60 is connected to drive shaft 46 first plunger bearing 68 first spacer 70 second plunger bearing 72 packing seal 74 and second spacer 76 plunger button end 60 b is connected to drive shaft receiving end 46 r packing nut 62 is connected to drive cylinder 54 backup ring 64 o ring 66 first plunger bearing 68 first spacer 70 second plunger bearing 72 packing seal 74 second spacer 76 and fluid cylinder 78 first plunger bearing 68 is connected to plunger 60 packing nut 62 and first spacer 70 the radial inner surface of first plunger bearing 68 abuts the radial outer surface of plunger 60 while the radial outer surface of first plunger bearing 68 abuts the radial inner surface of packing nut 62 first spacer 70 is connected.