Graco A Series Instructions-Parts List Manual page 11
Power supply module , dispensing module , fluid meter
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Also See for A Series:
- Instructions - parts manual (52 pages) ,
- Instructions-parts list manual (48 pages) ,
- Manual (36 pages)
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To Inspect,
Adjust
Or Service
Fluid
Meter:
Remove
cover and proceed
as follows:
To inspect
or replace cam wheel:
pull up on cam to see
if it is loose -
tighten
both setscrews
if loose. Inspect
cam for damage or wear. Loosen setscrews
and remove
cam from shaft if damaged
or worn.
Install new cam on
shaft,
then adjust
micro-switch
(see Fig 9) and install
cover.
NOTE:
The normally
open micro-switch
must close
each time
its roller
rides over cam
wheel
lobes. A quart meter has 5 lobes and a liter
meter
has 10 lobes.
To find
out if micro-
switch
is faulty,
or needs adjustment,
see
below:
To check for a faulty
micro-switch,
push switch
roller
arm
in all the way
and use an ohmmeter
or other
suitable
instrument
on soldered
terminals
of switch
to
see if switch
is closed.
If not closed,
remove switch,
in-
stall new switch
and adjust.
To
adjust
micro-switch,
loosen
both
cam
wheel
setscrews;
rotate cam until switch
roller rests on top of
a lobe and use an ohmmeter
or other suitable
instru-
ment to see if switch
is closed.
If it is not closed,
loosen
both switch
mounting
screws,
move switch
in until it
closes,
rotate
cam wheel
until roller rests on cam be-
tween
two
lobes;
and check
with
ohmmeter
to see if
switch
is open. Tighten
mounting
screws where switch
opens and closes properly
and install cover.
NOTE:
Do
not
bend
micro-switch
roller
arm.
If
switch
cannot
be adjusted
properly,
replace
switch.
To clean meter fluid piston,
proceed
as follows:
(See
Fig 10)
1.
Stop pump, dispense fluid at a station supplied
by
this pump to relieve line pressure,
close gate valve
downstream
of
meter
and
disconnect
electric
power from Power Supply
Module.
2.
Disconnect
fluid hose from gate valve and meter,
and meter from pump.
3.
Secure meter in a vise and screw cap out of meter
housing.
Carefully
remove o-ring packing,
using a
small
straight
blade
screwdriver.
Then
remove
piston and chamber
assembly.
4.
Insert screwdriver
into notch of chamber,
pry off
top and remove
inner parts.
5.
Clean
all
parts,
including
meter
housing,
thoroughly
in solvent
and blow
dry.
Inspect
all
parts for damage
or wear.
Especially
check outer
surfaces
of piston and inner surfaces
of chamber
bottom
for pitting
or scoring,
and replace these
parts,
if
necessary,
with
a complete
meter
assembly.
NOTE:
Be careful
not to damage
cam
wheel
or
micro-switch,
or get solvent
in switch
when
servicing
fluid piston.
6.
To assemble,
insert piston
into chamber
bottom
SO
the divider
plate is centered
in slot of piston.
Turn the pawl pinion on gear box so the notch in
small disk on opposite
side of gear box is centered
on the groove
in the larger disk. Align the divider
plate in chamber
bottom
with groove in bottom
of
gear box and snap together.
CAM WHEEL AND SWITCH -
BETWEEN
PINS
ON TOP OF PIN
CAM WHEEL--\
I
SETSCR
MOUNTING
SCREWS
LOOSEN
TO ADJUST
\=k
Pull chamber
from
housing
CHAMBER
SCREEN
7.
Place chamber,
gears first, and piston assembly
in
meter housing
and turn it to be sure gears mesh.
When
properly
engaged,
meter
cam wheel
will
turn as chamber
and piston assembly
turns.
8.
With
chamber
screen and o-ring
in place, screw
cap tightly
into meter
housing,
install cover and
reinstall
meter.
9.
Start pump
and dispense
fluid to test meter and
system
operation,
and
to
purge
all air from
system.
307-362
11
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