4501

6. Be sure starter or fl oat switch overload protection device is proper for the voltage used and the motor

horsepower.

7. Start motor, and test for proper rotation. The shaft should rotate clockwise when looking down on the motor. (For left hand pumps the shaft should rotate counter-clockwise.) If rotation is wrong, reverse any two line leads to the motor if 3 phase power is used.

If single phase is used, consult motor manufacturer or his representative. After correct rotation is obtained, connect the drive coupling. (If the pump shaft should be rotated in the wrong direction, the shaft couplings might unscrew and cause a bent shaft or broken impeller or casing.)

2. Unscrew the top pipe nut (294) and loosen the bottom pipe nut (294). The discharge pipe can now be removed from the pump either by unscrewing the pipe or removing bolts and nuts at the pipe fl ange.

3. Next, unscrew the nuts (247) holding the strainer

4.

(316) and suction cover (9) to the pump casing (1).

(Note: Pump sizes 3M, 4M, 5M and 5MS have two-piece strainers.) Place suction head gasket (73) in a bucket of water to keep it pliable.

Unscrew the impeller nut (24) by turning it counter-clockwise while holding the drive coupling

(42) with a strap wrench.

8. Before starting pump close gate valve. Start pump and slowly open gate valve until desired capacity is

obtained.

9. Pump should operate smoothly, If pump vibrates, there may be a severe distortion of the pump as a result of excessive installation strains on pump support plate or discharge pipe, or because of damage in shipment.

5. To remove the impeller from the shaft, make three special cap screws as follows:

Fig 4501 - 3/8” x 16 NC with threads cut 1¾” long;

Fig. 4511 and Fig. 4521 - 1/2” x 13 NC with thread cut

2” long. Screw these cap screws into the three tapped holes in the impellers shroud. The cap screws will tighten against the bottom bearing housing (33) thus forcing the impeller (2) and impeller washer (270) off the shaft (6). Lift the impeller key (32) from its seat in the shaft.

C - LUBRICATION

1. Pump bearings are properly fi lled with grease at the factory before shipment. Periods of subsequent lubrication depend somewhat on local conditions, hours of operation, load, speed, temperature, etc.

As a guide we recommend that the thrust bearing (18) be greased every two or three months and, for grease lubricated pumps, the shaft bearing bushings (39) every eight hours of operation. If liquid being pumped contains abrasives, lubricate shaft bearings (39) every four to six hours of operation.

E - FOR INSPECTION AND

REPLACEMENT OF BEARING

BUSHINGS

1. Dismantle liquid end as described in Section B.

2. Disconnect grease pipes (242) starting at the pump support plate (23).

2. A sodium base grease #2 or #3 consistency should be used for thrust bearing (18) and a water resistant grease such as “Lubri-plate 142” for the shaft bearing

3. Unscrew nuts (342) holding the casing (1) and bottom bearing housing (33) to the bottom column pipe (101).

The casing and bottom bearing housing can now be removed from the column pipe.

3. Motor bearings normally require a sodium base grease #2 or #3 consistency. Follow motor manufacturer’s recommendation as to grease and frequency of lubrication.

GENERAL REPAIRS

D - FOR INSPECTION AND REPAIR

OF LIQUID END

1. Close discharge gate valve and disconnect pipe at pump support plate, also remove electric wires from the motor. Unscrew foundation bolts in the support plate (23) then lift pump and support plate as a unit from the pit to the fl oor.

4. If it is necessary to replace the choker ring (257) and bottom bearing bushings (39), carefully note their position in the bearing housing, then, with a piece of tubing or round bar of the proper size, push the bearing bushing and choker ring out of the fl anged end of the housing.

5. To remove the intermediate bearing housing (33) and bearing bushings (39), unscrew fl ange bolts and nuts

(285) and slide bottom column pipe (101) off over shaft (6) then slide bearing housing (33) with bearing bushings (39) off the shaft. Note position of bearing bushings in housing then push the bearing bushings out of the housing as described in #4 above.

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