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the headplate bores. Generally, new seals will be <br />required prior to reassembly. <br />6. Remove the bearing inner race and sleeve (38) <br />from the shaft with the aid of a bearing puller by <br />inserting the puller jaws in the groove in the sleeve <br />and applying the jacking screw against the end of <br />the shaft. Protect the threaded hole and the end <br />of the shaft with a small, flat spacer between the <br />shaft and the puller. <br />ASSEMBLY <br />Prior to any assembly operation, it is essential that all <br />parts are completely clean and free from nicks and <br />scratches. <br />Prior to assembly, lightly coat the groove in the sleave <br />with slip plate. ROOTS P/N813-314-000. <br />1. Assembly of Piston ring seals (28) - To avoid <br />scratching the lip seal surface, install the Piston <br />ring seals (28) in the sleeves (38) from the end <br />nearest the groove before assembling the sleeve <br />on the shaft. <br />Unhook the gap joint and expand the ring while <br />sliding it to the groove, then compress it so one <br />end of the hook joint slides over the other. Move <br />the ring in the groove to be sure it is free. <br />NOTE: ❑are m--IsrCe eCen no�ib s_ra= or den- <br />-e slee[ e s rfa a sinr:e iCis a sealing sErfaL-e <br />for E e lip seal. <br />2. Installation of sleeves (38) - heat the sleeve to <br />300° F (149°C) then quickly slide it on the shaft <br />tightly against the impeller. If the sleeve hangs up <br />during assembly, it can be pressed into place <br />using a tubular pressing tool with square, <br />clean ends. <br />3. Assembly of seals (27) in headplate (1) - Place <br />headplate flat with seal bores up. Be sure the <br />pressing tool face is clean and square and there is <br />a smooth, clean entering bevel in the headplate. <br />Lubricate the seal lips. Place seal over the bore <br />with lip facing up, then press the seal evenly until it <br />is flush with bore face. <br />For Gas Sealed Units: Assemble mechanical <br />seals (27) in headplate - (CAUTION: Care m❑sr <br />-e -sed Io- avoid damaging �--e L arJon fa -e. <br />-efore pro-eeding wi i =,is srep�yo�] sCo--Jd i -a le <br />a pilo"ed seal dri-er w' -i is designed ._o Clear <br />Lig Caron fal e.) with headplate positioned <br />horizontally with seal bores up. Be sure the <br />pressing tool face is clean and square and there is <br />a smooth, clean entering bevel in the headplate. <br />Place the seal over the bore with carbon facing up. <br />Then press the seal evenly on its steel shell using <br />the piloted seal driver until the driver seats against <br />the stop. <br />4. Assembly of impellers (12 and 13) to headplate <br />(1) - Place gear end headplate flat on 3 in. <br />(76 mm) blocks with the smallest bores facing up. <br />Inspect entering bevels to be sure they are smooth <br />and clean. Locate the drive impeller correctly <br />(top for vertical units and toward the driver for <br />horizontal units). Place the seal ring gaps toward <br />the inlet for pressure applications and towards dis <br />charge for vacuum applications. Insert the impeller <br />shafts in the headplate so the impellers rest on <br />the headplate. Use care to avoid damaging the <br />lip seals. <br />5. Assembly of cylinder (11) to gear end headplate <br />(1) - Install dowel pins (16) and secure cylinder to <br />headplate with capscrews (23). Torque to 35 ft.-Ibs <br />(4.5 Kg -m). Then, install drive end headplate (1) <br />and dowel pins (16) and secure with capscrews <br />(23). Install feet (76) & 77) to both headplates and <br />secure with capscrews (66). Torque to 35 ft.-Ibs. <br />(4.5 kg -m). <br />For Gas Sealed Units: Use a Teflon sealant <br />between headplate and cylinder joint. Assemble <br />rotating seal - apply a light coating of oil to the <br />O-ring and seal face. Then with flute side out <br />install the rotating seat tight to the shaft sleeve. <br />Check and record seal compression - With the <br />seal body in place and the impeller against the <br />opposite headplate, check that seal compression <br />is adequate. This can be checked using a depth <br />gauge or dial indicator from the face of the head <br />plate to the face of the mating ring. First, measure <br />this distance while the carbon is out at its full <br />length. Then, push the mating ring back against its <br />stop and measure it again. The difference <br />between these measurements is the compression. <br />This can be done easily with finger pressure as the <br />spring force is only 10 lbs. The correct travel is <br />given below (record actual compression on <br />clearance sheets). <br />SEAL COMPRESSION <br />Frame Minimum Maximum <br />400 .047' .097" <br />600 .108" .151 " <br />' Prior to to assembly, lightly coat the groove in the sleave(38) with slip plate <br />ROOTS- PIN 813-314-000 <br />6. Installation of bearings (14) - Heat bearing inner <br />race to 300°F (149°C) in an oven or hot oil; then <br />slide it onto the shaft so the bearing shoulder is <br />snugly against the sleeve. Note: Be sure to install <br />the shaft shim (70) behind the shaft sleeve before <br />installing the drive end drive bearing inner race. <br />This is required to compensate for the oil leader for <br />shimming. Insert the bearing outer race and rollers <br />in each bore and tap lightly in place. Spray <br />bearings with lubricant. <br />7. Measure and record the end clearances between <br />the impellers and drive headplate using long feeler <br />gauges. Then, subtract the allowed average drive <br />end clearance. See Table 6. The result is the <br />space required between clamping plates (34) and <br />bearing outer race. Place shims (10) as required <br />to get this clearance. Then, fasten the clamping <br />For your nearest ROOTS Office, dial our Customer Service Hot Line 1 877 363 ROOTS (7668). <br />W <br />