Sterlco Upright High Temperature Heat Transfer - Manual (Page 35)

Upright Portable Hot Oil TCUs Chapter 5: Maintenance 35
Thrust Bearing Adjustment
1. Loosen axial setscrews in face of end cap on the thrust bearing assembly. If rotor
shaft cannot be turned by hand, back off the thrust bearing assembly until there is a
noticeable drag of the shaft. Note mechanical seal will provide some drag and this is
a normal condition. The thrust bearing assembly must be turned in until it can just be
turned over by hand. This ensures the rotor is against the head and a zero end
clearance condition exists.
2. Make a mark on the OD of the bearing housing and a corresponding mark on the
bracket. Back off thrust bearing housing the required number of marks or distance on
the OD as shown below.
3. Tighten the axial setscrews in the face of the thrust bearing assembly. Make sure the
rotor shaft turns freely. If it does not, repeat steps 1 and 2.
*Each small notch on outer end cap represents .001 inch end clearance.
WARNING! Before starting the pump, make sure that all drive equipment guards are in place!
Failure to properly install the guards may result in serious injury or death!
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 the bushing.
PUMP
SIZE
Turn Outer End Cap C.C.W.
No. of Notches* or Length on O.D., Inches
G - 0.75"
HL, HV 6 1"
KK 10 1.38"