Kerr Pump Corporation KT-3350XP, Parts And Service Manual

Always

 

retighten

 

the

 

plunger

 

and

 

pony

 

rod

 

union

 

periodically

 

following

 

the

 

removal

 

of

 

the

 

plunger

 

to

 

insure

 

it

 

is

 

securely

 

made

 

up

 

and

 

will

 

not

 

vibrate

 

loose.

 

E.

 

PLUNGER

 

PACKING:

  

This

 

manual

 

includes

 

illustrations

 

of

 

the

 

packing

 

sets

 

for

 

each

 

model

 

pump.

  

Generally,

 

once

 

the

 

plunger

 

has

 

been

 

removed

 

from

 

the

 

pump,

 

the

 

packing

 

can

 

be

 

exposed

 

for

 

removal

 

by

 

completely

 

removing

 

whatever

 

device

 

is

 

used

 

to

 

tighten

 

the

 

packing

 

(i.e.

 

the

 

packing

 

or

 

stuffing

 

box

 

nut

 

or

 

gland).

  

There

 

will

 

be

 

various

 

amounts

 

of

 

metal

 

rings

 

and

 

packing

 

components

 

depending

 

upon

 

the

 

type

 

of

 

packing

 

and

 

the

 

model

 

of

 

pump

 

(refer

 

to

 

appropriate

 

illustration

 

or

 

chart).

  

After

 

the

 

removal

 

of

 

all

 

rings

 

and

 

equipment

 

from

 

the

 

stuffing

 

box;

 

thoroughly

 

clean

 

it

 

and

 

inspect

 

for

 

damage,

 

which

 

might

 

keep

 

the

 

new

 

packing

 

from

 

working

 

properly.

  

If

 

the

 

stuffing

 

box

 

is

 

in

 

satisfactory

 

condition,

 

install

 

the

 

new

 

packing

 

as

 

per

 

the

 

appropriate

 

illustration.

  

It

 

is

 

a

 

good

 

idea

 

to

 

lubricate

 

new

 

packing

 

with

 

a

 

light

 

oil

 

prior

 

to

 

installation.

  

Most

 

of

 

the

 

standard

 

packing

 

used

 

in

 

pumps

 

should

 

be

 

tightened

 

with

 

the

 

original

 

equipment

‐

packing

 

wrench

 

while

 

the

 

pump

 

is

 

running

 

under

 

normal

 

operating

 

pressure.

  

After

 

a

 

two

 

or

 

three

 

hour

 

run

‐

in,

 

check

 

the

 

packing

 

for

 

tightness

 

and

 

re

‐

adjust

 

as

 

necessary.

  

Packing

 

should

 

be

 

checked

 

for

 

tightness

 

on

 

a

 

periodic

 

basis,

 

but

 

it

 

is

 

not

 

a

 

good

 

idea

 

to

 

attempt

 

to

 

periodically

 

tighten

 

the

 

packing

 

as

 

part

 

of

 

routine

 

maintenance.

  

This

 

tends

 

to

 

“wear

 

out”

 

the

 

packing

 

prematurely.

  

When

 

the

 

packing

 

leaks

 

in

 

an

 

excessive

 

amount

 

it

 

should

 

be

 

replaced.

  

There

 

is

 

no

 

value

 

in

 

constantly

 

“re

‐

tightening”

 

leaking

 

packing.

 

If

 

your

 

pump

 

is

 

equipped

 

with

 

optional

 

“spring

 

loaded”

 

packing,

 

there

 

is

 

no

 

adjustment

 

in

 

this

 

equipment

 

during

 

its

 

operational

 

life.

  

The

 

stuffing

 

box

 

nut

 

is

 

initially

 

tightened

 

as

 

much

 

as

 

possible

 

and

 

there

 

is

 

no

 

further

 

adjustment.

  

Note:

 

In

 

all

 

cases

 

the

 

spring

 

goes

 

in

 

the

 

stuffing

 

box

 

before

 

the

 

packing

 

rings.

 

When

 

using

 

the

 

optional

 

Kevlar

 

or

 

Teflon

 

packing,

 

be

 

sure

 

to

 

rotate

 

the

 

“splits”

 

so

 

that

 

none

 

are

 

“aligned”

 

to

 

insure

 

that

 

the

 

packing

 

holds

 

properly.

  

Normally,

 

this

 

packing

 

is

 

not

 

lubricated

 

and

 

requires

 

less

 

tension

 

on

 

the

 

stuffing

 

box

 

nut

 

during

 

operation.

 

       

 

CAUTION:

 

 

An

 

“airtight”

 

seal

 

is

 

not

 

desirable

 

with

 

this

 

plunger

 

packing.

  

Some

 

slight

 

dripage

 

is

 

desirable

 

during

 

operation.

  

Attempts

 

to

 

tighten

 

packing

 

until

 

it

 

completely

 

“seals

 

off”

 

will

 

result

 

in

 

premature

 

failure

 

from

 

too

 

much

 

friction.

  

The

 

Kevlar

 

&

 

Teflon

 

packing

 

must

 

be

 

allowed

 

to

 

drip

 

a

 

small

 

amount

 

to

 

assure

 

normal

 

life.

 

F.

 

PONY

 

ROD

 

and

 

PONY

 

ROD

 

PACKING:

  

Kerr

 

Pumps

 

use

 

two

 

pony

 

rod

 

sealing

 

arrangements,

 

models

 

KD

‐

1250,

 

KJ

‐

2250,

 

KM

‐

3250

  

and

 

KCP

‐

6300

 

use

 

a

 

screw

 

in

 

seal

 

gland,

 

all

 

other

 

models

 

use

 

a

 

bolt

 

in

 

seal

 

gland,

 

these

 

glands

 

use

 

press

 

in

 

oil

 

seals

 

with

 

snap

 

ring

 

retainers.

  

Some

 

Bolt

 

in

 

gland

 

use

 

adjustable

 

packing

 

arrangements

 

with

 

bolt

 

in

 

or

 

screw

 

in

 

followers

 

to

 

adjust

 

packing.

  

By

 

unscrewing

 

plunger

 

from

 

pony

 

rod

 

a

 

gap

 

may

 

be

 

facilitated

 

to

 

allow

 

the

 

removal

 

of

 

the

 

various

 

sealing

 

arrangements.

  

A

 

special

 

wrench

 

will

 

be

 

needed

 

to

 

remove

 

and

 

replace

 

pony

 

rod

 

to

 

crosshead.

  

(This

 

wrench

 

is

 

available

 

from

 

Kerr

 

Dealers

)

  

All

 

pony

 

rods

 

have

 

a

 

jam

 

nut

 

to

 

align

 

tighten

 

pony

 

rod

 

to

 

crosshead,

 

care

 

must

 

be

 

exercised

 

in

 

installing

 

new

 

seal

 

on

 

pony

 

rod

 

not

 

to

 

damage

 

it.