Flowserve Gearex Rotary Gear Pumps External and Internal Bea User Manual download pdf (Page 41)

EXTERNAL GEAREX USER INSTRUCTIONS ENGLISH 71569246 (2167B-E1)

Flowserve Pump Division 41

gears. Slide the shaft assembly into the body (1)

and remove the timing gears and keys.

f) If rotor spacers are required, slide them onto the

shafts and up against each end of the rotors.

g) Install the thrust bearings (16) in the rear bearing

housing and retain with snap ring (25).

h) Mount a new end flange gasket (50) on the rear of

the body.

i) Slide the rear bearing housing assembly over the

shafts and mount on the end of the body. (Note

that the “top” mark is in the correct location. If a

new rotating element is being installed in the

pump, refer to section 6.10.1.2 Internal bearing

pump.

j) Re-install the timing gear spacers (18), keys (22),

timing gears (13) and locknuts (19) and washers

(20) as indicated by the marking done during

disassembly. Tighten the locknuts snugly but

avoid overtightening as the lockwasher anti-

rotation tab could be damaged. Bend one

lockwasher tang on each lockwasher to lock the

nuts.

k) Withdraw the rear bearing housing and shaft

assembly slightly from the body and check the

end clearance of the rotor/rotor spacer and the

bearing housing face. This should be equal to

half the clearance listed in the Table of

Engineering Data in this manual. If the measured

clearance varies from the value listed by more

than 25 per cent, it will be necessary to dismantle

the unit and adjust the position of the rotors in the

press. Failure to provide the correct clearance

may result in pump seizure (clearances too tight)

or poor hydraulic performance (clearance too

large).

l) Mount a new gasket (50) on the rear bearing

housing (3) and fit the rear cover (4). Replace all

capscrews in the rear end finger tight only.

m) Install the front bearing outer race assemblies (14)

into the front bearing housing (2).

n) Mount a new gasket (50) on the front of the body

(1) and slide the front bearing housing into place,

noting the position of the “top” mark.

o) If the pump is fitted with a mechanical seal, mount

the rotating head on the drive shaft using the mark

scribed at disassembly for location. Tighten all

set screws securely.

p) Mount a new gasket (50) on the front of the

bearing housing and install the front head (5).

Install all capscrews finger tight.

q) Re-fit all alignment dowel pins (60).

r) Tighten all capscrews at rear end of pump.

s) While tightening all capscrews at the front of the

pump, rotate the drive shaft by hand to check for

binding. If the pump binds before the capscrews

are tight, it will be necessary to install another

gasket between the front bearing housing and

body.

t) Install the seal stationary seat in the seal gland

and install the gland on the front head.

u) If the pump has a packed stuffing box, install new

packing and replace gland.

6.10 New rotating elements

6.10.1 Mechanical seal fitted pumps

6.10.1.1 External bearing pump

If a new rotating element is being installed, the pump

should be assembled without mechanical seals up to

and including step I) in section 6.9.1 or 6.9.2. The

following procedure is then to be followed.

a) Using a straightedge, mark the point on the drive

and driven shafts in line with the flange face on

the front end of the body.

b) Remove the thrust bearing bracket to body

capscrews and nuts, and pull the rotating element

partially out from the rear of the pump with the

rear bracket assembly intact.

c) Using a straightedge, mark the point on the shafts

in line with the flange face of the rear bracket.

d) Remove the bracket assembly from the rotating

element.

e) With the datum lines now marked on the shafts,

refer to the applicable mechanical seal drawing for

the required setting dimension.

f) Assemble the seals on the shafts and proceed

with the steps outlined in section 6.9.1 or 6.9.2.

6.10.1.2 Internal bearing pump

If a new rotating element is being installed, the pump

should be assembled without mechanical seals up to

and including step I) in section 6.9.3. The following

procedure is then to be followed.

a) Using a straightedge, mark the point on the drive

shaft in line with the flange face on the front head.

b) Remove the front head.

c) With the datum lines now marked on the shafts,

refer to the applicable mechanical seal drawing for

the required setting dimension.

d) Assemble the seals on the shafts and proceed

with the steps outlined in section 6.9.3.

6.11 Free movement

If the pump does not turn freely after reassembly, the

following procedure should be observed.

a) Remove front and rear head dowel pins.

b) Loosen all head to body capscrews except for the

four corners at each end.

c) Check location of rotors in the body bores by

reaching into the discharge flange and checking

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Flowserve Gearex Rotary Gear Pumps External and Internal Bea User Manual Page 41

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