Goulds Pumps 3420 - IOM - Manual (Page 77)

Grease Lubrication
a. Bolt the bearing housings (134 and 134A or 134D
and 134A) to the bearing end covers (109B and 119B)
using capscrews (370 or 371C). Tighten the
capscrews to the torque shown in Table 11.
b. Bolt the end covers (109A and 119A) to the
bearing housings using capscrews (370 or 371C).
Tighten finger tight.
*c. Slide the dust cover (332) and the coupling on the
shaft.
* These parts are replaced by the optional labyrinth
seals (332 Opt, 333 Opt) when so equipped. Do not
separate the rotor from the stator with labyrinth style
seals.
INSTALLATION OF THE ROTATING
ELEMENT
1. Install and position the coupling hub on the shaft
(122). Heat the hub in an oven or hot oil bath until
the hub reaches 300
°F (150°C). Slide the hub on the
shaft until it is positioned in the same location as it
was originally. It should like up with the mark
scribed on the shaft during disassembly.
s
! WARNING
Use proper personal safety equipment when handling
the hot coupling hub.
2. Clean all the fits/seats (wear ring, bearing housing,
stuffing box bushing) in both the upper and lower half
casing.
3. Slide the casing wear rings (127) onto the impeller.
Be sure the continuous lock on the rings is facing
toward the impeller.
4. SX/MX: Carefully lower the rotating element into the
lower half casing. Make sure the double locks on the
wear rings are facing up and the anti-rotation pins
(445A) in the stuffing box bushings and the rabbet fit
of the bearing housings are facing down. Ensure the
pin engages the hole in bushing fit bore. The unit
should easily settle into place.
All other Groups: Carefully lower the rotating
element into the lower half casing. Make sure the
double locks on the wear rings, bearing housings, and
stuffing box bushings are facing up.
$
CAUTION
Do not completely take the weight off of the sling.
5. SX/MX: After the element has been properly seated,
rotate the rings 180
° so that the double locks are
located in the lower half casing.
All other Groups: After the element has been properly
seated, rotate the rings, bearing housings, and stuffing
box bushings 180
° so that the double locks are located
in the lower half casing.
6. Check the location of the impeller with respect to the
casing. Make sure the impeller is centered in the
casing. If it is not, loosen the sleeve nuts and shift the
sleeves and the impeller as required. Check for free
turning by rotating the shaft by hand.
7. SX/MX: Bolt the thrust end bearing housing to the
casing using the bearing housing to casing capscrews
(372U). Tighten the capscrews to the torque values
shown in Table 11.
All other Groups: Replace the thrust end bearing cap
(111A) and tighten the nuts (425A) evenly to the
torque values listed in Table 11.
$
CAUTION
Make sure the caps are replaced on the same end from
which they were removed and that the match marks are
lined up.
Check for free turning by turning the shaft by hand.
8. For SX/MX, M, 18x20-24 and 20x24-28 ONLY:
Adjust the shaft end play.
a. Clamp a dial indicator to the pump such that the
button rests against the end of the shaft.
b. Push the shaft back and forth as far as possible.
The total end play must be at least .001 in. and not
more than .008 in. (.025 - .203 mm).
c. If the end play is less than .001 in., add thrust end
bearing end cover gaskets or bearing housing to oil
ring housing gaskets (360 or 360G) until the proper
clearance is obtained. If the endplay is greater than
.008 in., remove gaskets as necessary.
NOTE: Because of manufacturing tolerances, duplex
bearings may vary in width up to .030 in. A correctly
assembled pump may require several gaskets to
correctly set the bearing end play.
9. SXMX: Bolt the radial end bearing housing to the
casing using the bearing housing to casing cap screws
(372U). Tighten the cap screws to the torque values
shown in Table 11.
All other Groups: Replace the radial end bearing cap
and tighten the nuts evenly to the torque values listed
in Table 11.
$
CAUTION
Make sure the caps are replaced on the same end from
which they were removed and that the match marks are
lined up.
3420 IOM 8/09
73
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