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The pump housing and gears are not sold as separate repair items, because the gears must be factory fit to the pump housing. If the pump should malfunction during the warranty period, return the complete pump assembly, without disassembling, to your authorized service department or contact your authorized service department for instructions. Unauthorized disassembly of the pump in the warranty period will VOID WARRANTY. The following is an outline of the procedures for disassembling and reassembling the pump. PUMP DISASSEMBLY 1. Clean unit thoroughly with solvent or other non-corrosive cleaning fluid which will not affect the rubber components. 2. Remove woodruff key (5) from the drive gear shaft. 3. Scribe a line across the first three sections of the pump, starting from the front cover (9). This line should be drawn approximately parallel with the drive shaft, and later act as a guide to properly position the sections during reassembly. 4. Remove the bolts (1) and washers (2) which hold the three sections together, consisting of the front cover assembly (9), the center section (14) and the back cover (3). 5. Separate the three sections. Do not try to pry between the sections to avoid damaging machined surfaces. Instead, overcome the resistance to disassembly by holding on to the front cover and tapping the back cover with a soft metal mallet while maintaining parallelism between the sections as they separateto prevent "cocking" on the dowel pins (8). After separation, the center section may still be attached to either the front or back cover assembly. In this event, place the short end of the drive gear (4) into one cover assembly bearing, place the driven gear (15) into the other bearing, and gently tap the protruding gear shaft ends with a soft hammer while holding on to the center section. Gears shall be alternately tapped to avoid "cocking'1 the cover on the dowel pins. 6. Remove the wear plate (6). 7. Scribe a maxk on the front cover (9) island next to the small pressure vent hole in the phenolic material heat shield (12) . This mark will later act as a guide during the reassembly. ■.. . .. ■ • J Rempve the phenolic material heat shield (12), the paper compounded gasket (7) and the rubber v-seal (11). These parts are readily removed by installing a small diameter rod, such as the end of a paper clip, into the small pressure vent hole. 8. Remove o-rings (13) from grooves located in the front and back cover faces. 9. Remove rotary seal(10) by exercising great care to avoid damage to the housing bore because it is contained by a force fit which must not leak. It is recommended an expandable hook type tool be used to engage the steel retainer portion of the seal. The seal should be pulled out of its bore without "cocking" to avoid damaging the seal bore. Heating the aluminum housing to 250° F. will reduce the force fit, the load necessary to remove the seal, and consequently minimize the possibility of damaging the bore. NOTE: It is advisable not to remove the rotary seal (10) if it is in good condition and did not leak. 10. Clean all parts, including#pump housing, in a suitable solvent. After cleaning parts witii solvent, use air pressure to blow any dirt or excess solvent from all parts including inside of pump housing. 11. Examine allparts for wear or damage and remove any nicks or burrs. PUMP REASSEMBLY 1. Install rotary seal (10) (if it was removed) in front cover with the spring loaded lip facing inward. Force seal into place using aflat steelrod larger than the seal O.D. so as to permit the tool rather than the seal to bottom on the housing. Load to force seal into place should be applied exactly in line with the housing seal bore to prevent bending 18 F-2486-10-86 SERVICE the seal steel retainer and/or scouring the seal housing bore . The front cover (9) must be backed up on a smooth clean surface to prevent damaging its face. 2. Install v-seal (11), gasket (7), and finally heat shield (12) into the front cover cavity as follows: The small vent hole thru all of these parts should be in line and positioned next to the scribe mark on the island previously made during disassembly. This position locates the vent holes on the outlet side of the pump. The lips on the v-seal (11) should face toward the cavity and be tucked into the groove with the aid of a dull tool to prevent damage to the rubber surface. . ' The gasket (7) should be pressed firmly toward the bottom of the cavity with the thumbs so as to insure all of its perimeters are completely well within the groove to avoid interference with subsequent assembly. The heat shield (12) should be firmly pressed toward the bottom of the cavity with the thumbs to provide sufficient space for the wear plate (6). Use an oil coated smooth bullet-nosed type shaft seal protector in contact with the shaft end chamfer to prevent damage to the rotary seal. Diameter of the seal protector can be equal to but not more than .010 below s...

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