Zenith Pumps manual D-Bearing Orientation Schematic, Disassembly continued

Disassembly continued

plate and set aside in a safe place to pre- vent damage. At this point, make certain to note the orientation of the groove on the rear of each bearing with respect to the inlet port. They MUST be reassembled in the same way as disassembled; that is, they must point toward the inlet port, or severe pump damage may result when the pump is started.

WARNING: (Read before steps 7 & 8) Extreme caution must be exercised when removing the gear shafts and bearing. For the 40 cc/rev and above capacity pumps, which have two (2) tapped holes in the D- bearing faces, an optional disassembly method is possible. If the gear shaft and two D-bearings will not slide out as a complete assembly after tapping with a soft-faced hammer, it is recommended that a gear puller tool be used to extract the individual D-bearings from each side of the gear shafts. If these still exhibit force, soaking in a lubricating (penetrat- ing) oil will help the disassembly.

For 20 cc/rev and smaller capa- cities, there are no tapped holes in the D-bearing faces to be utilized. The gear shaft and D-bearings must be removed as a complete assembly. Again, soaking the parts in lubricating (penetrating) oil or other non-damaging solution will help ease the disassembly. Do not force the parts out one side with a hammer or arbor press.

7)Slide the gear shafts and bearings out of the center plate. They will not come out separately as the gear teeth will not clear the bearings. Take extreme care not to nick or ding the gear teeth or the edges of the bearings. If they will not slide out easily, use a hammer with a plastic or soft brass head to gently tap them out. DO NOT use a steel-headed hammer. Alternate taps on the shafts until the parts slide clear. Separate the two shaft/bearing assemblies, taking care not to lose the keys in the 10 cc/rev and smaller pumps. There are no keys in the 20 cc/rev and larger pumps.

8)Slide the bearings from the shafts, again taking extreme care not to damage the gear teeth, bearing edges or the shafts. If the bearings will not slide easily from the shaft (due to residual polymer), use a plastic or soft brass-headed ham- mer and a soft drift (NOT steel) to gently tap the bearings free. Do not pry them off with a screwdriver or other tool as this may damage the gear teeth. Identify which shaft the bearings came from, and set them aside in a safe place.

9)On the 3 cc/rev and smaller, slide the gears from their shafts and remove the keys from the shaft.

D-Bearing

Orientation

Schematic

8