GORMAN-RUPP 62-1/2E13-4A084, Техническое руководство, Страница: 57 / 107

Section VIII. OVERHAUL INSTRUCTIONS
3-22. GENERAL
This section provides information useful for repair
and replacement of pump components. Detailed repair
information for the engine is provided in the engine
manual.
TM 5-2805-259-14.
3-23. CENTRIFUGAL PUMP
a D i s a s s e m b l y .
—.
Warning. Always disconnect spark plug leads from
s p a r k p l u g s b e f o r e s t a r t i n g d i s a s s e m b l y
procedures. This will prevent engine from
starting accidentally during disassembly.
Disassemble and remove the pump, following the
sequence of the key index numbers assigned to the
exploded view in figure 3-13. Give particular attention
to the following:
(1) Before beginning disassembly:
( a ) D r a i n v o l u t e c a s i n g ( f i g . 3 - 1 1 ) .
(b) Remove exhaust primer connection from priming
tube (16).
(c) Remove the attaching parts which secure the
(2)
(3)
(4)
(5)
(6)
support bracket (25) to the skid.
When volute casing (21) and assembled parts
a r e r e m o v e d , i m p e l l e r ( 2 7 ) a n d i n t e r m e d i a t e
bracket (42) will remain mounted on the engine.
A r i g h t - h a n d t h r e a d s e c u r e s i m p e l l e r ( 2 7 ) t o
impeller shaft (44). To remove the impeller from
the impeller shaft, hold the engine starter pulley
and turn the impeller counterclockwise facing
impeller end.
After the removal of the impeller, the shims (28),
seal spring, and seal rotating element can be
removed from the impeller shaft (44). The shaft
sleeve (34) can also be removed.
Remove the eight nuts (29) and lockwashers (30)
that secure the seal plate (32) to the intermediate
bracket (42) of the pump; remove the seal plate
and its assembled wear ring (35), and stationary
ring of the seal assembly. Remove the stationary
r i n g a n d i t s a s s e m b l e d O - r i n g f r o m t h e s e a l
plate.
Remove the eight capscrews (36 and 38) and
lockwashers (37 and 39) that secure the inter-
m e d i a t e b r a c k e t ( 4 2 ) a n d g u a r d ( 4 0 ) t o t h e
e n g i n e ; r e m o v e t h e g u a r d a n d i n t e r m e d i a t e
(7)
(8)
(9)
bracket with its assembled impeller shaft (44),
bearing (48), and seal (46). Pull straight out on
the bracket so that the splines of the impeller
shaft will disengage the splined coupling (53)
secured to the engine.
Remove the retaining ring (43) and push the
assembled impeller shaft (44) and bearing (48)
from the intermediate bracket (42). The bearing
retainer (45) and its assembled oil seal (46) will
be released as the shaft is removed from the
b r a c k e t . R e m o v e t h e o i l s e a l ( 5 0 ) f r o m t h e
intermediate bracket after the shaft assembly is
removed.
Remove the two retaining rings (47 and 49) and
press the shaft (44) from the bearing (48). .
Remove the four capscrews (51) and lockwashers
(52) that secure the splined coupling (53) to the
engine. Do not remove the pilot bushing from the
coupling unless it is damaged and requires re-
placement.
b . Cleaning. Clean all parts in an approved solvent
and blow dry with clean, dry compressed air.
c . Inspection and Repair.
(1)
(2)
(3)
(4)
I n s p e c t a l l p a r t s f o r w e a r , c r a c k s , s c o r i n g ,
and other damage. Replace all gaskets and seals,
and all other parts found to be defective.
Check the condition of the wear rings (28 and 35)
p r e s s e d i n t o t h e v o l u t e c a s i n g ( 2 1 ) a n d s e a l
plate (32). The internal diameter of the rings
s h o u l d n o t e x c e e d 0 . 0 7 0 i n c h m o r e t h a n t h e
external diameter of the mating portion of the
impeller. If worn or damaged, lay the assembly
on a flat surface and block firmly. Using a sharp
chisel, remove the bronze wear rings. Press new
rings into place until they are fully seated. If
the internal diameter of the new wear ring is
0 . 0 7 0 i n c h g r e a t e r t h a n t h e m a t i n g e x t e r n a l
diameter of the old impeller, replace the im-
p e l l e r .
Inspect the ball bearing for cracked or scored
races, pitted or scored balls, and signs of over-
heating. Rotate the races by hand and check for
rough, catching, o r b i n d i n g o p e r a t i o n . T h e r e
should be no more than just perceptible play
between the balls and races.
It is good practice to replace the shaft seal with
every overhaul. Replace the seal as a complete
assembly. Do not mix new and used parts.
3-13