Inspection and Maintenance
5-20
750-392
CBEX-DE
Dismantling:
1. Lift out the two front cylinder pins that hold the screen, and remove the screen.
2. Disconnect the flared nut on tubing behind screen and lift tubing high enough to prevent drainage of lubricat-
ing oil from the tank.
3. Disconnect the flared nut at the orifice fitting.
4. Remove the two sheet metal screws that hold the cylinder in place. One screw is located at the top rear of the
cylinder, the other is at the bottom front.
5. Remove the entire heat exchange assembly, consisting of the cylinder, the finned tubing, and the oil line “B”.
6. Remove the fan from the air pump.
7. Disconnect the flexible air line from the lube tank.
8. Remove the coupling guard by pushing in on both sides until it clears the clamp.
9. Loosen the clamp at the rear of the tank and remove the tank with copper tubing attached.
10. Leave the rear pump bracket (coupling end) in place to aid in realignment of the replacement pump. Do this
by removing the two capscrews that extend through the bracket into the pump housing. Temporarily leave the
front bracket attached to the pump.
11. Remove screws holding the front bracket to the base and lift off the pump with its attachments. Note the
location of the pipe fittings and brackets prior to removing for installation on the replacement pump. If piping
is dismantled, be sure that the check valve is re-installed so that the gate swings toward the pump.
Reassembly
Reassemble in reverse order. With the rear pump bracket left in place, realignment and spacing between the
pump shaft and the motor shaft is greatly simplified.
There should be approximately 7/8” space between the two shafts. Place the coupling insert between the cou-
pling halves prior to reassembly. Check that both shafts rotate freely.
Refer to the previous section on coupling alignment instructions.
If shims were used originally under either pump brackets or motor feet, be sure that they are correctly re-
installed.
When re-installing the fan, slide the hub on the pump shaft so that it is bottomed. Tighten the setscrew and cap-
screws. If the fan blades were removed from the hub, be sure that the side of the blade marked “Blower” faces
the hub when reassembling. When tightening the coupling halves or the fan hub, tighten the setscrews against
the key first, then tighten the setscrew against the shaft. Clean or remove any dust or grime from the blades prior
to re-installing.
When replacing the retainer screen, a slight force may be required to push the cooling coil into the air cylinder so
that the pins may be fitted into place.
When replacing the compressor, be sure that all piping connections are tight.
If the motor was replaced or if motor leads were disconnected, be sure that pump rotation is proper before start-
ing operation. The air pump should rotate in a clockwise direction, as viewed from the drive shaft end.
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