Goulds Pumps 3500XD - IOM - Manual (Page 41)

3500XD IOM 8/07
37
l
! CAUTION
Pump and components are heavy. Failure to properly lift
and support equipment could result in serious physical
injury or damage to pumps. Steel toed shoes must be
worn at all times.
1. Install shaft flingers. Note: flingers are required on “L”
group pumps only. Prop shaft upright and apply a light
coat of oil to the shaft turn for the flinger. Place flinger
on shaft and push on by hand as far as possible. Use a
block of wood and a hammer to seat the flinger in place
against the shaft shoulder. The block should be set
against the thin wall of the flinger that forms the
cylindrical mounting surface (see Figure 24). Flip the
shaft to place the other end up and install the second
flinger in the same manner.
NOTE: Never use a hammer to drive shaft through
bearings. Severe shaft and bearing damage may occur.
“S” and “L” Group
2. Refer to Figure 23 for installation of the four point thrust
bearing. Remove bearings from boxes and orient as
shown in Figure 23. NOTE: Items 1 and 3 are not
interchangeable. Heat and mount item 1 against shaft
shoulder. Lubricate and install item 2. Heat and install
item 3. Heat and install item 4.
“M” Group
2. Install Pumpac thrust bearing as follows. Remove
bearings from boxes and orient as shown in Figure 22.
Oil bearing seat on shaft. Slide both bearings onto shaft
as far as possible by hand. Place pipe or driving sleeve
over shaft making sure it rests against inner race only.
Make sure bearing is “square” on shaft. Tap or press
evenly until bearing is seated firmly against the shaft
shoulder. Do not mar shaft, especially where it contacts
the labyrinth seal.
3. Insert the bearing lock washer (382A), pressing tang into
shaft keyway until it is firmly against the bearing.
4. Oil shaft threads lightly and snug the bearing locknut
(136) against the lock washer. Tighten firmly with a
spanner wrench. Seat tang securely into slot in locknut
with drift pin. If necessary, tighten locknut slightly to
match tang with slot. do not loosen locknut to position.
5. Slide bearing housing (134A) with o-ring in place, over
impeller end of shaft and over outboard bearing.
6. Install labyrinth seal stator into thrust end cover with
o-ring lubricant applied to o-ring.
7. Place bearing end cover (109A) and .006” white manilla
gasket (360A) over coupling end of shaft and fit into
bearing housing. If oil seal is dry, oil lightly before
sliding over shaft. Be sure to position “TOP” (cast on
cover) in line with “TOP” on housing. Bolt end cover
firmly to housing. Install labyrinth seal rotor on shaft
with o-ring lubricant.
8. Oil inboard bearing seat on shaft. Slide inboard roller
bearing (409) on shaft as far as possible by hand. Place
driving sleeve of sufficient length over the shaft. The
sleeve should contact the inside race of the bearing. Be
sure the bearing is “square” on shaft then press or tap the
bearing firmly against the shaft shoulder. Take care not
to mar shaft.
9. Place a small amount of o-ring lubricant on inside of
bearing frame at oil seal. Slide shaft assembly into the
bearing frame as far as possible. When the bearing
housing is properly installed (oil return hole at the
bottom), the word “TOP” located on the flange of the
bearing housing will line up with the top of bearing
frame. Be sure bearing housing o-ring (496) is in place
in groove on housing. Insert bearing housing bolts into
bearing housing and screw about ½” into frame to hold
shaft during further assembly.
10. Install labyrinth seal stator into the bearing end cover
(inboard) with o-ring lubricant.
11. Slide gasket (360) and inboard bearing end cover (119A)
over shaft and bolt to bearing frame.
12. Install labyrinth seal rotor on shaft with o-ring lubricant.
13. Bearing end play may be determined at this point as
follows:
Clamp dial indicator to the pump so that the button rests
against the end of the shaft. Push the shaft back and
forth as far as possible. Total end play must be at least
0.001” and not more than 0.008”. If end play is less than
0.001” add coupling and bearing end cover gaskets made
form 0.006” thick manilla paper. Because of machining
tolerances, duplex thrust bearings may vary in which by
up to 0.030”. A correctly assembled pump may require
as few as one or as many as three 0.006” thick gaskets.
Refer to Fig. 25.
14. Install and position coupling hub at scribe mark on shaft.
15. Slide shaft sleeve with cartridge mechanical seal in place
on the shaft.
6
Fig. 24