Flowserve Gearex Rotary Gear Pumps External and Internal Bea User Manual download pdf (Page 38)

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

Flowserve Pump Division 38

6.6 Renewal clearances

6.6.1 Clearance data for cast iron pump

Pump Size B C D E

Centre Distance

(inch)

1.750 2.125 3.375 4.375

Bore Diameter

(inch)

2.250 2.625 4.190 5.413

Clearance x.001

inch

4 to 6 6 to 8 6 to 8 9 to 11

6.6.2 Clearance data for carbon and stainless

steel pump

Pump Size B C D E

Centre Distance

(inch)

1.750

2.125 3.375 4.375

Bore Diameter

(inch)

2.260

2.635 4.200 5.423

Clearance x.001

inch Rotor/Bore

14 to 16 16 to 18 16 to 18 19 to 21

Clearance x.001

inch rotor End

4 to 6 6 to 8 6 to 8 9 to 11

Note that the clearance between the rotors and the

body is controlled by the dimensions and tolerances

on the manufacturing drawings. The rotor end

clearance is controlled by the rotor position on the

shaft, using an assembly jig, and the thickness of the

front gasket (which is standardized at 0.38 mm (0.015

inch) thick).

6.7 Disassembly

Note that replacement materials should be available

prior to disassembly to limit downtime.

6.7.1 Disassembly of external bearing pump

Refer to the sectional drawing in Section 12.3,

Figure 1, at the end of this manual.

a) Ensure that the driver is locked out and cannot be

accidentally started.

b) Ensure that the pump is isolated from the system

by closing off all primary and auxiliary piping

valves associates with the pump.

c) Flush the pump body and piping system if

necessary.

d) Disconnect stuffing box and other auxiliary piping.

e) Drain the pump body and lube oil cavities.

f) Remove coupling guard and uncouple the pump

from the driver.

g) Remove the pump half coupling. If a spacer

coupling is not used, it will be necessary to

remove either the pump or the driver from the

baseplate to do this.

h) Remove the front (5) and rear (4) covers.

i) Remove the front bracket ( from the pump. Mark

the "top" of the bracket to facilitate reassembly. If

the pump has mechanical seals, ensure that the

bracket is drawn smoothly off the shafts without

bumping. Note that if the pump is fitted with split

brackets the bearing housing half (3A) can be

separated from the seal housing to facilitate seal

maintenance.

j) Remove the front bearing snap ring (24) and

remove the bearing (14) from the bracket.

k) Back off the gland nuts and remove the

glands/mechanical seals (40).

l) Remove the timing gear locknuts (19) and

lockwashers (20).

m) Remove timing gears (13) and spacers (18) and

note marks for reassembly.

n) Remove the rear bracket from the pump. Mark

the "top" for reassembly. Note that if the pump is

fitted with split brackets the bearing housing half

(2A) can be separated from the seal housing to

facilitate seal maintenance.

o) Remove the bearing snap ring (25) and remove

the bearings (15).

p) Back off the gland nuts and remove

glands/mechanical seals (40).

q) The shafts (10,11) and rotors (12) may now be

removed from the pump body (1).

r) If fitted, remove the stuffing box restriction

bushings from the shaft and remove rotor spacers

if fitted.

s) The pumping rotors are pressed on and keyed to

the shafts. They should not be disturbed unless

replacement is necessary. If replacement is

necessary, mark the shaft at each end of the rotor

and remove from the shaft in a press.

t) Refer to section 6.8 Examination of parts.

6.7.2 Disassembly of internal bearing pump

Refer to the sectional drawing in Section 12.3,

Figure 2, at the end of this manual

a) Ensure that the driver is locked out and cannot be

accidentally started.

b) Ensure that the pump is isolated from the system

by closing off all primary and auxiliary piping

valves associates with the pump.

c) Flush the pump body and piping system if

necessary.

d) Disconnect stuffing box and other auxiliary piping.

e) Drain the pump.

f) Remove coupling guard and uncouple the pump

from the driver.

g) Remove the pump half coupling. If a spacer

coupling is not used, it will be necessary to

remove either the pump or the driver from the

baseplate to do this.

h) Remove front head (5) and bearing housing (2). If

the pump is fitted with a mechanical seal, scribe

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 49 50

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Flowserve Gearex Rotary Gear Pumps External and Internal Bea User Manual Page 38

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