Flowserve Guardian Sealless Metallic - Manual (Page 47)

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11
Page 47 of 68 flowserve.com
6.9 Assembly of pump
It is important that all pipe threads be
sealed properly. Flowserve does not recommend the
use of PTFE tape as a thread sealant.
Flowserve has investigated and tested alternate
sealants and has identified two that provide an effective
seal, have the same chemical resistance as the tape.
These are La-co Slic-Tite and Bakerseal. Both products
contain finely ground PTFE particles in an oil based
carrier. They are supplied in a paste form which is
brushed onto the male pipe threads. Flowserve
recommends using one of these paste sealants.
Full thread length engagement is required for all
fasteners.
Refer to Figure 6-2 for recommended bolt
torques.
6.9.1
Power end assembly
6.9.1.1
Bearing installation
Mounting of bearings on shafts must be done in a
clean environment. Bearing and power end life can
be drastically reduced if even very small foreign
particles work their way into the bearings. Wear
clean gloves.
Bearings should be removed from their protective
packaging only immediately before assembly to limit
exposure to possible contamination. After removing
the packaging they should only come in contact with
clean hands, fixtures, tools and work surfaces.
The chart shown in Figure 6-26 gives the SKF part
numbers for bearings in Flowserve Guardian G & H
Series pumps. Note that the term “inboard bearing”
refers to the bearing nearest to the casing. “Outboard
bearing” refers to the bearing nearest to the motor.
a) New ball bearings and lip seals should be
installed if the old ones were removed. It is good
practice to replace both components whenever a
pump is disassembled. Both the inboard and
outboard ball bearings [3011, 3013] have a slight
interference fit on the drive shaft [2100.2].
b) In order to mount open bearings (oil bath and oil
mist lubricated) on the shaft, heat the bearings
uniformly to 93 °C (200 °F) with an induction
heater or clean oven.
Use insulating gloves while
handling hot bearings.
Figure 6-26: Flowserve Guardian G & H Series
power end bearings
Group Type of bearing
Inboard and outboard
single row, deep groove 3
Oil bath/mist – open 1 6307-C3
1 Greased for life -
double shielded 2
6307-2ZC3
Oil bath/mist – open 1 6310-C3
2 Greased for life -
double shielded 2
6310-2ZC3
1. These bearings are open on both sides. They are lubricated by
oil bath or oil mist.
2. These bearings are shielded on both sides. They come pre-
greased by the bearing manufacturer. The user does not need
to regrease these bearings. The shields do not actually contact
the bearing race, so no heat is generated.
3. The codes shown are SKF codes. Inboard and outboard
bearings have the C3, greater than “normal” clearance. These
clearances are recommended by SKF to maximize bearing life.
All bearing configurations are supplied only with steel cages
c) Quickly slide the bearings onto the drive shaft
and position them firmly against the drive shaft
shoulder. The inboard and outboard bearings
are interchangeable. Let the bearings cool for at
least one hour before proceeding further.
An alternate installation procedure for the open
bearings is to follow the method described for sealed
and shielded bearings below:
a) Sealed or shielded bearings (i.e. greased for life)
should be mounted on the shaft by pressing on
the inner race until the bearings rest firmly
against the drive shaft shoulder.
b) When the bearings are pressed, even force
should be applied to the inner race only. Never
press the outer race, as the force will damage the
balls and races.
c) After the bearings have been mounted, check for
ease of rotation.
6.9.1.2
Power end assembly – long-coupled
Guardian G & H series pumps
a) Clean the interior surfaces of the bearing housing
and bearing cover using a non-flammable solvent
cleaner. Press the inboard lip seal [4310.1] into
the bearing housing [3132], and the outboard lip
seal [4310.2] into the bearing cover [3260]. Metal
shield on lip seal to face the outside environment.
b) Place the wavy washer [127A] in the bearing
housing. Slide the drive shaft [2100.2] and bearings
into the bearing housing [3200]. (Figure 45.)
The outboard bearing protrudes out of the
bearing housing until the bearing cover is in place.
When the bearing cover fasteners are tightened, the
wavy washer in the bearing bore will compress, thus
placing the bearings in their final position.