Flowserve MARK 3 GROUP 4 User Manual

Page 37

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MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12

Page 37 of

48

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recommended], press the bearing on shaft with

the aid of a sleeve designed to push the inner

race only. Note that the bearing must remain

square to the shaft during assembly and that the

inner race must seat on the shaft shoulder.

Protect the bearing by wrapping with a clean, lint

free cloth.

6.10.3 Thrust bearing

a) Pack thrust bearing with grease if the bearings

are being grease lubricated.

b) Place the thrust bearing clamp ring [2542]

loosely over the shaft on the largest diameter.

c) Install the angular contact bearings [3031] on the

shaft [2110] using the same procedure as

described in step 6.10.2. The bearings are

mounted back to back as shown.

Bearing arrangement

d) Slide the bearing lockwashers [6541] on the shaft

and fit the bearing locknut [3712]. Tighten the

locknut snugly and allow to cool. Check the

tightness and bend one tab on the lockwasher

into a slot in the locknut. Protect the bearings

from contamination.

e) Carefully install the IN seal [4300.2] in the thrust

bearing housing [3240] by pressing it squarely

into the bore. The primary sealing lip [spring

loaded] on seal should be installed facing the

bearing. A small amount of sealant may be

applied on the O.D. of the seal prior to its'

installation.

f) Lubricate the O-rings [4610.3] with the bearing

lubricant and assemble it into the groove of the

outer circumference of the thrust bearing housing

[3240].

g) Lubricate the inside bore of the thrust bearing

housing [3240] and assemble it over the thrust

bearings. Care must be taken to prevent

damage of the seal on the shaft.

h) Using capscrews and lockwashers, attach the

thrust bearing clamp ring [2542] to the thrust

bearing housing [3240]. Lock the threads using

Loctite 242 or equivalent.

The thrust bearing clamp ring [2542] is

provided with one extra hole midway between two

adjacent bolt holes to permit free oil flow. On oil

lubricated units, this hole must align with the cast oil

return at the bottom of the thrust bearing housing

bore. For grease lubricated units, this hole should be

oriented away from the cast oil return slot at the

bottom the thrust bearing housing bore.

Tighten the capscrews evenly ensuring that the

clamp ring is not distorted and gap to the bearing

housing is even all around. Tighten in accordance

with section 6.6.

6.10.4 Frame assembly

a) Place the bearing frame in a vertical position with

the large flange resting on wooden support

blocks sufficiently high to allow the shaft from

contacting the floor when it is installed.

b) Lift the shaft assembly into a vertical position and

lower it into the bearing frame [3130].

c) Screw the thrust bearing housing into bearing

frame housing at least 7 revolutions to prevent

the assembly from coming apart when lifting.

d) Place the bearing frame assembly into a

horizontal position.

e) Install the setscrews [6577].

f) Carefully install the INPRO seal [4300.2] in the

line bearing frame [3130] by pressing it squarely

into the bore. A small amount of sealant may be

applied on the O-ring of the seal prior to its'

installation.

g) Install the coupling key [6700] and tape to the

shaft.

h)

Mount a dial indicator to the bearing frame [3130]

and indicate shaft under bearing frame flange

(approx. mid way between impeller mounting face

and end of sleeve area. Rotate shaft and check that

run-out does not exceed 0.050 mm (0.002 in.).

6.10.5 Stuffing box

6.10.5.1 All

a) Install the gland studs [6572] using Loctite grade

A or equivalent. The gland studs [6572] on water

cooled stuffing boxes must be sealed with pipe

sealant. If only two gland studs are used, the

remaining two tapped holes must be plugged

with set screws or short capscrews. To ensure

proper sealing, the chamber can be tested to a

design pressure of 75psi.

b) Press the stuffing box neck bush [4132] into the

stuffing box [4110], ensuring that it seats squarely

on the shoulder.

c) Lubricate the shaft [2110] at the impeller position,

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