Xylem A-C Fire Pump – Vertical Turbine Fire Pump AC8499 User Manual

Page 15

5. Fit gib key (760) into keyway, by filing if necessary, to

where there is a snug but sliding fit. This key must be able

to be removed by gentle leverage with a screwdriver under it.

6. Be careful that the gib key (760) is not too high so as to

hold up the adjusting nut (604) from seating on the drive

coupling. If it is, cut off some of it.

7. Install adjusting nut (604) to hand tight.

GEAR DRIVES WITH ENGINES

1. The procedure for installing a hollow shaft gear is exactly

the same as for the motor.

2. Checking pump rotation is very simple matter. Check the

arrows of rotation on the engine. Throw out the clutch, take

a bar and jack over the flexible driveshaft in direction of

engine rotation, and note if it turns the pump shaft in the

proper direction. Note: engines almost invariably turn

clockwise when looking toward the gear drive.

COMBINATION ENGINE AND MOTOR DRIVES

1. On combination drivers, the motor is invariably on top with

a projecting head shaft extension.

2. Follow all procedures outlined on page 19, except that the

motor must be lowered over this extended driveshaft and

great care must be taken to center it exactly so as not to

bump or miss-align the shaft while the motor is being

lowered into place.

3. There are several methods of running engines without

electric motors and vise versa, requiring simple adjustment

to the combination drive, but they are too numerous to

mention here and can be obtained from the gear manufac-

turers instructions included with the shipment.

IMPELLER ADJUSTMENT FOR ALL
HOLLOW SHAFT DRIVES

NOTE:

Shaft adjustment up or down is accomplished by turn-

ing the adjusting nut (604) Figure 7.

NOTE:

There are five holes in the adjusting nut and only four

in the motor coupling. See Figure 7 and Figure 8.

CLOSED IMPELLERS

1. The same procedure is followed as described under, "Gear

Drives with Engines", above. The adjustment is not critical.

A clearance of 1/8" to 3/16" (4.8mm) is considered

adequate. See Outline Drawing (if available) for this setting.

Figure 7

Figure 8