TM 5-3895-374-24-2 THRUST BEARING ADJUSTMENT 1. Loosen setscrews over outer and inner end caps.  Two for H and HL size pumps, four for all other sizes. 2. Turn inner end cap clockwise, viewed from shaft end, until it projects  slightly  from  bracket  exposing  approximately  three threads. 3. Turn outer end cap clockwise until rotor is tight against head and rotor shaft cannot be turned. 4. Make a reference mark on bracket end, opposite a notch on outer  end  cap.    Back  off  outer  end  cap  required  number  of notches.  See Figure 14. Each 1/4 travel on circumference of end cap is equivalent to approximately .0015 inch for all sizes. 5. End  clearances  set  per  Step  4  are  adequate  for  viscosities up  to  750  SSU  (SAE   20   lube   oil   at   room   temperature). Higher viscosity liquids require additional end clearances. As   a   general   guideline,   for   viscosities   between   750   and 7500  SSU  (heavier  lube  oils)  double  the  amount  of  end clearance  indicated  in  Step  4;  for  viscosities  between  7500 and  75,  000  SSU  (e.g.,  resins)  triple  the  amount  and  for viscosities   greater   than   75,   000   SSU   (e.g.,   black   strap molasses) use 4 times the amount. For    specific    recommendations    for    end    clearances    for viscosity or for operating temperatures above 225 F, check with your Viking representative or consult the factory. 6. Tighten inner end cap with a spanner wrench.  Tap spanner wrench   lightly   but   DO   NOT   OVER   TIGHTEN   as   it   will damage the threads. 7. Tighten  setscrews  that  hold  inner  and  outer  end  caps  to prevent their turning in bracket. 8. Rotor and shaft should turn smoothly by hand one complete revolution.  If rotor and shaft doesn’t turn smoothly, go back and repeat Thrust Bearing Adjustment Steps 1 thru 8. TOTAL END CLEARANCE CHART PUMP TURN OUTER END CAP TOTAL SIZE COUNTER-CLOCKWISE NO OF NOTCHES END CLEARANCE’ H & HL 5 .005 K thru LL 8 .008 *Tot end clearance includes extra clearance for temperature of 40 F FIGURE 14. INSTALLATION OF CARBON GRAPHITE BUSHINGS When installing carbon graphite bushings, extreme care must be taken to  prevent  breaking.    Carbon  graphite  is  a  brittle  material  and  easily cracked.    If  cracked,  the  bushing  will  quickly  disintegrate.    Using  a lubricant and adding a chamfer on the bushing and the mating part will help  in  installation.    The  additional  precautions  listed  below  must  be followed for proper installation: 1. A press must be used for installation. 2. Be certain bushing is started straight. 3. Do  not  stop  pressing  operation  until  bushing  is  in  proper position,   starting   and   stopping   will   result   in   a   cracked bushing. 4. Check bushing for cracks after installation. Carbon  graphite   bushings   with   extra   interference   fits   are frequently  furnished for high temperature operation.  These bushings must be installed by a shrink fit. 1. Heat bracket or idler to 750° F. 2. Install cool bushings with a press. 3. If facilities are not available to reach 750 F temperature, it is possible to install with 450 F temperature; however, the lower the temperature, the greater the possibility of cracking bushing. Consult factory with specific questions on high temperature applications.  Refer to Engineering Service Bulletin ESB-3. PRESSURE RELIEF VALVE INSTRUCTIONS FIGURE 15. Size H and HL FIGURE 16. Size K, KK, L, LO, and LL LIST OF PARTS 1.  Valve Cap 6.  Valve Body 2.  Adjusting Screw 7.  Valve Spring 3.  Lock Nut 8.  Poppet 4.  Spring Guide 9.  Cap Gasket 5.  Bonnet 10.  Bonnet Gasket page 3-1221