Too much grease may cause excessive bearing temperature and cause the grease to leak out of the housing to the windings.
Piston rod packing should be replaced once every 2 years.
To replace the piston rod packing, use the following steps:
1. Remove the six bolts on top of the cylinder head. Remove the cylinder head.
2. Loosen the hex nut (figure 3-2) at the bottom of the piston rod.
3. Remove the three bolts that hold the cylinder body to the crosshead guide unit.
4. Raise the cylinder body and unscrew the piston rod from the crosshead so that it clears the base.
5. The piston rod packing is now in a position to be replaced. Remove the locknut from the piston rod and then remove the piston rod packing nut.
6. When you replace the flanged-type packing, remember that the packing nut serves only to hold the packing in place. Tightening the nut excessively will not increase its efficiency; the packing nut should not be forced down tight enough to damage the packing flange.
7. After you replace the packing and packing nut, mount the cylinder body on the crosshead guide. Make certain that the locknut is replaced on the piston rod before you screw it into the crosshead.
8. Screw the piston rod into the crosshead until the top edge of the piston packing is flush with the top of the cylinder body, with the crosshead in the uppermost position (figure 3-2). To check this adjustment, rock the crank back and forth; then tighten the locknut at the bottom of the piston rod.
9. Replace the piston head and tighten all the mounting bolts.
The Walter Kidde unit, like the SC-5 is designed and manufactured expressly for the purpose of transferring carbon dioxide in its liquid form from one cylinder to another. The unit is supplied complete with the necessary adapters, recharging valves, safety discs and bushings, nuts, bolts, and washers needed to make connections to the cylinders and minor adjustments to the unit. Pump Models 4211 and 4211-1 are driven by a three-fourths horsepower motor and are equipped with a safety switch and lead fitted with a plug. Three-prong plugs and three-wire leads should be substituted for the ordinary two-wire and two-prong arrangement. Pump Models 4306 and 4306-1 are driven by a single-cylinder, four-cycle, three-fourths horsepower, air-cooled engine. Figure 3-3 illustrates the Walter Kidde electric recharge unit, Model 4211.
Figure 3-3. - Walter Kidde Electric CO2Transfer Unit, Model 4211.Continue Reading