Sterlco Midsize - Manual (Page 43)

Portable Hot Oil Temperature Control Units Page 43
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.
Preventative Pump Maintenance
You can extend the life of your pump and reduce the cost per gallon pumped if you perform a
few preventive maintenance procedures.
Lubricating the Pump
Using #2 ball bearing grease and a hand-operated grease gun, gently lubricate all grease
fittings after every 500 hours of operation or after 60 days, whichever comes first. If pump
service occurs in severe conditions, lubricate more frequently. Use an appropriate type of
grease for hot or cold applications.
Adjusting End Clearance
After long periods of service, the running clearance between the end of the rotor teeth and
head may be increased from wear. The pump may lose some capacity of pressure as a result.
If you reset the end clearance, pump performance should improve.
Examining Internal Parts
Remove the head occasionally and examine the idler, bushing, head and pin for wear.
Replace the idler bushing and idler pin after moderate wear to avoid replacing more
expensive parts later.