Crane DEMING 5460 Series Скачать руководство пользователя страница 5

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F - PUMP ADJUSTMENT

If after making the installation as above and the pump
shaft does not rotate freely or if there is vibration
in the pumping unit, the following adjustments are
recommended.

LOCK ENTRANCE DISCONNECT

SWITCH IN THE OFF POSITION

and separate the

coupling halves before proceeding.

G - IMPELLER ADJUSTMENT

An outstanding feature of this pump is the abillity to adjust
the impeller clearance to compensate for eventual wear or
to modify the design performance of the pump.

The normal clearance between the impeller vanes and
suction cover (9) or the casing (1) at the suction inlet is
.012 to .015 inches which provides optimum operating
performance. To adjust the impeller clearance, proceed as
follows:
1.

Disengage

fl exible shaft coupling.

2. Unscrew the 3 adjusting lock nuts (204) until

they are against the heads of the jackscrews

(286) then unscrew the jackscrews several turns.

3. Tighten the 3 cap screws (213) evenly by

alternating the cap screws until the shaft can no

longer be turned by hand at the coupling. This

will lower the rotating assembly, seating the

impeller (2) against the suction cover or casing.

4. Loosen the cap screws (213) ½ turn. Carefully

tighten the 3 jackscrews (286) by alternating the

jackscrews approximately 1 - 1½ hex to obtain the

desired .015 inches clearance. Retighten the cap

screws (213) until snug and then tighten the

adjusting lock nuts (204) to lock adjustment. Make

sure that the shaft turns freely by hand before

starting the pump.

5. Reassemble coupling and place pump in

operation.

H - DISCHARGE PIPE

Improper alignment of the discharge pipe (161) may cause
the shaft to bind. Loosen the top pipe lock nut (294) 2 to
3 turns and test for shaft rotation. If shaft is free, gradually
tighten the top pipe lock nut checking shaft rotation as the
nut is tightened.

If the shaft still binds, lift the pump from the tank or pit
and loosen the bottom pipe lock nut. Continue to tighten
the top pipe lock nut and the binding should be relieved.
Tighten the bottom pipe lock nut when maximum shaft
freedom has been accomplished and make sure that the
top pipe lock nut is tight.

An accurate check of the impeller and pump alignment can
be established by the use of a watt meter to measure the
minimum power requirement of the motor.

I - LUBRICATION

The pump bearings (18) and (16) and the lip seals (47)
and (49) were properly lubricated at the factory before
shipment. Periods of subsequent lubrication will depend on
local conditions, hours of operation, speed, temperature,
etc.

It is recommended that the bearings and seals be
periodically inspected and lubricated. As a guide we would
recommend the following frequency.

Pump Service

Ambient

Temperature

Lubrication

Interval

8 hours per day

high

low

6 to 8 weeks

12 weeks

24 hours per day

high

low

3 to 4 weeks
6 to 8 weeks

A lithium base grease of medium consistency with
corrosion resistant inhibiting properties must be used for
the ball bearings and the lip seals. Shell Alvania #2 or
equal is recommended.

Motor bearings should be lubricated in accord with motor
manufacturer’s recommendations.

J - GENERAL MAINTENANCE &

REPAIRS

Care should be exercised in keeping all parts of the pump
clean when out of the pump. Special precautions must
be taken to keep ball bearings and lip seals dirt-free at all
times.

Any part which is excessively worn or deteriorated and
all gaskets should be replaced with new parts before
reassembling the pump.

When ordering repairs, refer to the illustration for correct
item names and to the pump nameplate on which is
stamped the pump model number, size and serial number
which must be available when ordering repairs.

K - FOR INSPECTION OR REPAIR

OF LIQUID END

1. Close the gate valve in the discharge line and

LOCK

THE ENTRANCE DISCONNECT SWITCH IN THE

OFF

POSITION.

2. Remove power leads from the motor. Disconnect the

discharge pipe at the pump base plate.

3. Disengage

the

fl exible shaft coupling, per manufacturer’s