Operating Instructions and Parts Manual | JCU50 |
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Maintenance (Cont’d)
NOTE: Once a bladder is leaking or bro- ken, the bladder cannot be repaired. The tank must be replaced.
LUBRICATION
The bearing used in the pumps are life- time lubricated at the factory and require no additional lubrication.
PRECHARGED TANK
Some air is lost through the bladder in any tank. To prevent tank failure, check the tank precharge on a yearly basis.
1.Open a faucet nearest the tank and allow all water to drain from the tank.
2.Measure the tank precharge at the valve stem using a tire gauge.
3.If necessary, adjust the precharge with an air pump 28 - 30 psi on 1/2, 3/4 and 1 HP pumps.
REMOVING OLD SHAFT SEAL
Turn disconnect switch to “off” posi-
tion.
1.Open a faucet nearest the tank and allow all water to drain from the tank.
2.Remove the four cap screws holding the pump housing (volute) to the motor (Figure 12).
Machine | Seal | Pump |
Screws | Plate Diffuser | Housing |
|
| Cap (Volute) |
|
| Screw |
Motor |
|
|
| Impeller |
|
| Cap | Drain Plug |
| Screw | |
| (not shown) | |
|
|
Figure 12 - Convertible Well Pump
3.Separate the pump housing (volute) from the motor to expose the dif- fuser and the seal plate.
4.Remove the two cap screws and dif- fuser from the seal plate to expose the impeller.
5.Remove the small end cap on the end of the motor opposite the impeller.
6.With a large screwdriver or adjustable wrench, keep the shaft from rotating and remove the impeller with hand (standard right
hand thread). Be sure to hold onto the cast iron seal plate when remov- ing the impeller from the shaft.
7.Remove the seal plate.
8.Pry the rotating shaft seal member from the impeller (Figure 13).
Rotating |
| Seal | |
Shaft Seal | Impeller | ||
Plate | |||
|
Member
Rubber
Seat Ring 
Ceramic
Seat
Figure 13 - Removing Shaft Seal & Ceramic Seat
9.Push or pry the ceramic seat free from the seal plate (Figure 13).
10.Remove loose particles from impeller hub and seal plate.
INSTALLING NEW SHAFT SEAL
Before handling shaft seal parts wipe hands clean. Dirt or grease can
damage the seal.
1.Wet the inside of the seal cavity on seal plate and the rubber cup enclosing the new ceramic seat with cooking oil. Be careful not to scratch the ceramic surface of the seal seat and push seat enclosed in rubber into seal cavity on seal plate. Use a cardboard washer to protect polished surface when pushing against ceramic seat with any object. Be sure to remove cardboard washer.
2.Carefully slip seal plate over shaft so as not to disturb seal position in seal plate. The seal plate must be orientat- ed during assembly so that the two holes are on a horizontal line across the motor shaft and the (4) locating pins on the back of the seal plate line up with the tabs on the motor hous- ing (Figure 14). This placement should
Screw Holes
Motor
Shaft
Figure 14 - Seal Plate Replacement
be done to ensure proper draining and priming.
3.Place rotating shaft seal member in position on impeller and press into place. Take care not to press against polished seal surface.
4.Position impeller on shaft and tighten securely (Figure 15).
Seal
Plate Motor
Impeller | Seal | |
Plate | ||
|
Seal
Seat
Seal Facing Must
Be Clean For
Figure 15 - Motor Shaft Proper Seal
5.Secure diffuser to seal plate using the two cap screws. Be sure the screws are orientated on a horizontal line as described in Step 2.
6.Carefully position pump housing (volute) gasket over the diffuser onto the seal plate. In all convertible appli- cations the seal ring must also be positioned on the diffuser. In all shal- low well applications care must be taken that the
7.Assemble the pump housing (volute) to the motor using the four cap screws. Be sure the pump housing (volute) gasket is positioned correctly and tighten the screws securely.
NOTE: Shaft must rotate freely and motor end cap should be secured before operation.
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