TM 9-6115-604-34NAVFAC P-8-633-34SECTION IV. PRELUBE PUMP ASSEMBLY8-15.GENERAL. The prelube pump B3 is a gear-type fluid pump and is operated by a 24V dc electric motorcoupled directly to the pump. The prelube pump B3 is equipped with a by-pass valve which provides pressure relief fromexcessive discharge pressures which overheat the pump. Rotation of the motor and drive shaft is counter clockwisewhen viewed from the pump side of the motor. Lubricating of oil enters the pump through the port adjacent the by-passvalve, and is discharged through the port on the opposite side of the pump body. The prelube pump B3 provides initiallubrication to the engine prior to engine start, and is manually operated by PRELUBE SYS switch S5 on panel C in thegenerator set control room. The prelube pump B3 is bolted to the skid base by the right rear engine mount; whenoperated, it draws of oil from the engine of oil sump and delivers R under pressure to the engine oil passages.8-16.PRELUBE PUMP B3 DISASSEMBLY.a.Remove the prelube pump B3 from the generator set skid base in accordance with the Operator andOrganizational Maintenance Manual.b.Remove the machine screws (1, Figure 8-8) and lockwashers (2), and remove the motor (5) with the pumpassembly (8) from the motor base (4), if necessary.c.Remove the grommets (3) from the motor base (4), if required.d.Loosen the hexagon head capscrew (11) in the cover (12), and remove pump assembly (8) from the adapter(6). Remove the machine screws (7) and remove the adapter (6) from the motor (5).e.Remove the coupling (9) from the drive shaft (26).f.Remove the plug nut (14) and fiber washer (13) from the cover (12).NOTEThe by-pass valve assembly (15) is factory set to 70 psi (483 kPa).Disassemble the by-pass valve only if necessary. If disassembly isrequired, count the number of turns required to turn out theadjusting screw (19). During assembly, return the adjusting screw(19) to this position, so that the approximate factory pressuresetting will be retained.g.Remove the by-pass valve assembly (15) from the cover (12) by removing the valve nut (16), fiber washers(1 7), locknut (18), adjusting screw (19), spring (20), and ball (21).CAUTIONDo not pry the body (29) from the cover (12) using a sharp, a sharpinstrument such as a screwdriver or chisel as this may damage themating surfaces of the body and cover. If difficulty is experiencedin separating the body (29) from the cover (12), tap on the bodywith a plastic or lead faced hammer.h.Remove the machine screws (30), and remove the body (29) from the cover (12). Remove and discard thegasket (28).i.Remove the idle shaft (24) and gear (23), and the drive shaft (26) and gear (25), from the cover (12).j.Press the gear (23) from the idle shaft (24).k.Press the pin (27) from the gear (25), and press the gear from the drive shaft (26).l.Remove the carbon bearings (22) from the cover (12) and the body (29) only if worn. Check in accordancewith paragraph 8-18, step c, below.m.Remove the lip seal (10) from the cover (12).8-13
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
