Graymills Peristaltic OMI - Manual (Page 3)

ABOUT PERISTALTIC PUMPS
These pumps provide flow due to the action of two rotating rollers
continually squeezing and releasing the tube. They are self-priming
and deliver constant flow rates. The Graymills Peristaltic has been
designed for pressroom applications. They are fully reversible so
that systems can be pumped dry (systems will not self drain as
long as one or more rollers are squeezing the tube).
No tools are required for servicing the tube and rotor. To maximize
tube life, you should not put any valves on the tube to the print
deck. Valves create back-pressure which can cause tube failure.
Use the speed of the pump to control flow. The slower you run the
pump, the longer the tube will last.
INSTALLING THE TUBE
Your pump is supplied with four feet (1.2 m) of tube. (Note:
Explosion-proof pumps are supplied with five feet – 1.52 m – of
special solvent-resistant tubing.) This tubing has been selected as
providing the best all-around service life. Tube life will be maxi-
mized by following the tips later in this manual.
1. Loosen the three (3) quick-release screws on the front of the
pump head approximately one full turn to loosen. DO NOT
FULLY UNSCREW AND REMOVE. Slide bar to one side and
slide to open position (A) (see Fig. 1, page 24).
2. Slide pump head off the quick-release screws.
3. Feed tube through pump head starting at the bottom (leave
enough tube to reach almost to bottom of ink container) mov-
ing up and around (see Fig. 2, page 24).
4. Lay tube over portion already in place and out the top.
5. Replace pump head making sure it is fully seated.
6. Slide bar on quick-release screws to closed position and twist
until finger tight.
7. For greatest economy, push the included barb fitting on the dis-
charge of the tube and push standard discharge hose on the
other end (quick-connector can also be used).
NOTE: Installing the tube is made simple if the rotor is periodi-
cally rotated by hand as the tube is laid into the head.
OPERATING PUMP
Turning On
Electric: See Fig. 3a, page 24. Electric models have a main ON-
OFF switch at the rear of the enclosure. At the top front, the three-
way switch (A) allows the operator to choose Forward-Off-Reverse.
Before turning ON, be sure switch is in the center OFF position.
Air Motor: For air motor models, connect quick fitting assembly
with valve (be sure needle valve is closed) onto the right-hand fit-
ting (right side when facing front of pump). Place fitting assembly
with muffler onto left hand fitting (muffler must be used).
Explosion-Proof: See Figure 3b., page 24. Before Turning on, be
sure speed is set at zero by pushing red-knob of speed control
lever toward pump head, and make sure direction control (A) is in
neutral position.
Controlling Speed
Electric: Slowly turn speed control clockwise until flow is appropri-
ate for job.
Air Motor: Slowly turn air control needle valve until appropriate
flow is achieved.
Explosion-Proof: Move direction control (A) to desired position
(forward or reverse). Rotate knob (B) on speed control lever (C) to
loosen. Slide speed control lever (C) away from pump head to
increase speed. Tighten knob (B) on speed control lever to lock
desired position.
General Operating Tips
● Do not run faster than necessary as this will decrease tube life.
Use speed control to control pump flow.
● Never put a valve on the pump discharge or place it in a circuit
that will result in the pump discharge being blocked. Resultant
pressure could result in premature tubing failure. Use speed
control to control pump flow.
● Keep tubes and roller lubricated with a light, non-petroleum-
based oil to reduce friction and increase tube life.
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Graymills Peristaltic Pumps are fully reversible. This is very impor-
tant because peristaltic pumps are not self-draining. Without this
feature, ink would remain in the lines after the pump is stopped.
With this feature, you can easily pump the system dry.
Electric: These units are equipped with a hesitation type
forward/reverse switch. A mechanical catch stops the user from
reversing directions without pausing in the stopped position. Move
toggle switch to middle position, release pressure momentarily
until the motor stops. Failure to allow the motor to come to a com-
plete stop can blow the fuse and will significantly shorten the life of
the motor. Once motor has completely stopped, move the toggle
switch to the opposite side to change direction.
Air Motor: These units are equipped with a special reversible
motor. Air inlet and muffler assemblies are equipped with quick-
connectors. To reverse motor, disconnect and reverse assemblies.
Explosion-Proof: Reduce speed to zero and move direction con-
trol to neutral before reversing direction.
CAUTION
Unplug power to the pump before beginning any mainte-
nance. Wait 5 minutes for the capacitor to discharge and
for rotor to cool.
REPLACING THE FUSE(S) —
ALL MODELS
(Fig. 4, page 24)
Graymills part number #780-90736 (5mm x 20mm, 2.5 Amp,
250VAC fast acting fuse).
1. Unplug the power cord from the power receptacle
2. Open the Fuse holder door and remove the fuse holder.
3. Remove and replace the blown fuse(s) with the new fuse(s).
4. Install the Fuse holder in the Power Entry Module and close the
door.
5 Re-install the power cord.
ROTOR REPLACEMENT
1. Loosen the three (3) quick-release screws on the front of the
pump head approximately one full turn. DO NOT FULLY
UNSCREW AND REMOVE. Slide bar to one side and rotate to
align with the screw.
2. Slide front pump head off of pump and remove tube.
3. Remove bearing (bearing may be in cavity in pump head) and
O-ring.
CAUTION
Damaged rotors may break when being removed.
Take proper safety precautions, including wearing eye
protection.
4. The Rotor Assembly has a keyway. Move the rotor by hand so
the keyway is in the “up” position. This will prevent the keys
from falling out when the rotor is removed.
5. Firmly grasp the rotor assembly and slide it off the pump shaft.
6. Remove the retaining ring behind rotor.
7. Clean shaft, keys, and inside of pump head before installing
new rotor.
8. Install the new retaining ring. Be sure the ring snaps into the
groove on the shaft. Align keyway on rotor with shaft and firmly
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