Teikoku DynaPump LE Series, Instruction Manual

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Page 12
tact area for general appearance and uniform wear.
Excessive undercutting, pitting, or scoring is cause
for replacement.
Check the following points:
A. Corrosion
B. Contact marks and wear.
4-2.3. Rotor Assembly Inspection
The complete rotor assembly should be visually in-
spected for cracks, breaks, pitting, or corrosion which
might destroy the effectiveness of the hermetically
sealed rotor end covers and sleeve.
4-2.4. Stator Assembly Inspection
The complete stator assembly should be visually in-
spected for cracks, breaks, pitting, or corrosion of the
stator liner which may destroy the effectiveness of
the barrier. Inspect the inside of the electrical junction
box for corrosion and moisture.
4-2.5. General Inspection
1. Inspect the impeller bolt threads on the rotor shaft
to ensure they are not damaged. LE Series
Dynapumps have right hand threads.
2. Be sure that all mating faces are free of nicks and
burrs so that they will have a smooth face
ensuring a good seal. Clean off any trace of old
gasket material.
3. Make sure all parts are clean. Inaccessible area
may be cleaned with a small brush or pointed
tool.
4. The impeller face should be inspected for wear.
If excessive grooving or scoring of the wear rings
is evident, the impeller must be repaired or
replaced.
4-3. Reassembly
1. Clean and dry all parts. Reassemble in the re-
verse manner of disassembly.
2. Insert bearing with flat washer into front and rear
bearing housings. Position flat washer side of
bearing in line with set screw hole. While hold-
ing bearing down tighten set screw.
NOTE
The front bearing has only spiral grooves,
the rear bearing has spiral and straight
grooves.
3. Slide on Rear Thrust Collar, verifying that the
Thrust Collar is installed correctly. Slide on the
Rear Shaft Sleeve insuring that the Shaft Sleeve
is tight against the Thrust Collar and is engaged
in the anti-rotational key or pin. Install the Flat
Washer, Lock Washer, and Lock Bolt insuring
that the Lock Washer tab is engaged in the slot
in the Shaft Sleeve. Torque Lock Bolt per Table
4-4, Page 14.
This bolt has left hand threads.
4. Slide on Front Thrust Collar, verifying that the
Thrust Collar is installed correctly. Slide on the
Front Shaft Sleeve insuring that the Shaft Sleeve
is tight against the Thrust Collar and is engaged
in the anti-rotational key or pin. Slide assembled
Rotor into Stator with rear end of Rotor extending
out of the Stator.
5. Install the Rear Stator Gasket. Slide the Rear
Bearing Housing onto the Rotor and slide the
Rear Bearing Housing and Rotor into the Stator.
Take care to tighten bolting evenly. Torque Bolts
per Table 4-5, Page 14.
6. Slide Front Bearing Housing onto Rotor and into
Stator. Take care to tighten bolting evenly. Insure
that the Shaft Sleeve is tight against the Thrust
Collar and is engaged in the anti-rotational key
or pin.
7. Slide Adjusting Washers onto Rotor Shaft. Slide
Impeller onto Rotor Shaft, install the Flat Washer,
Lock Washer and Lock Bolt insuring that the Lock
Washer tab is engaged in the Impeller key slot.
Check Rotor Assembly endplay. End play should
be within the range indicated in Table 4-2, Page
7. If the rotor assembly does not fall within this
range, discard the old bearings and change to
new bearings.
8. Adjusting the “g-gap” using Figure 4-2, Page 13
and Table 4-3, Page 14. Pull impeller forward
and with adjusting washers, installed behind im-
peller in place, Gap “g” should be within indi-
cated ranges using Table 4-3, Page 14. If gap is
not within specified range, use adjusting wash-
ers behind impeller to make adjustments.
9. Make sure impeller bolt is tight (use Table 4-4,
Page 14. for correct torque values) and lock
washer locking tabs are bent over.
10. Assembled pump should rotate freely by hand
with no metal to metal contact.
11. Install Pump Case Gasket. Slide pump back
into casing and tighten all bolts. Add new Teflon
tape to plugs where needed. Torque Bolts per
Table 4-5, Page 14.