Chapter 8 — Inspection and Maintenance
8-20 Part No. 750-184
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 “A” 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 reinstalled so that the gate
swings towards the pump.
Reassembly
Reassembly in reverse order of disassembly. 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 coupling 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 reinstalled.
When reinstalling 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 reinstalling.
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.
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 starting operation. The air pump should
rotate in a clockwise direction, as viewed from the drive shaft end.
General
Keep the motor and other components free from dust and dirt to prevent
overheating and damage. Motor lubrication should follow manufacturer’s
recommendations.
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