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press the rotor onto the shaft. Slide a new O-ring onto the
shaft. Placement of the new O-Ring onto the shaft is impor-
tant because it sets rotor spacing from the front pump
head. Replace bearing.
9. Install new pump tube, replace front half of pump head, and
secure quick-release screws.
PUMP HEAD REPLACEMENT
Includes pump head only
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 (see Fig. 1).
2. Slide front pump head off pump and remove tube.
3. Remove bearing (bearing may be in cavity of pump head) and
o-ring.
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. Remove bearing.
8. Remove the four (4) cap screws securing the rear pump head to
the motor housing base and remove the pump head.
9. Clean shaft and keys before installing new pump head.
10. Install the new rear half of pump head. THIS PART OF THE
PUMP HEAD INCLUDES THE BRASS NUT INSERTS. Fasten
with four (4) cap screws.
11. Install bearing on shaft and into cavity of pump head.
12. Replace the retaining ring, be sure the ring snaps into the
groove on the shaft. Align keyway on rotor with shaft and firmly
press the rotor onto the shaft. Slide O-Ring onto the shaft.
Placement of the O-Ring is important because it sets rotor
spacing from the front pump head. Place bearing removed in
step 3 into the new pump head.
13. Install new pump tube, replace front half of pump head, and
secure quick-release screws.
The motor housing cover on some electric and all air driven
models cannot be completely removed since it is connect-
ed with wire or air lines. Pulling the housing cover too far
can cause damage to wires or air lines.
PUMP HEAD ASSEMBLY
REPLACEMENT
Includes pump head with quick-release screws,
rotor assembly and rotor shaft
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 pump and remove tube.
3. Move rotor by hand to gain access to cap screws. Remove the
four (4) screws securing the rear pump head.
4. Remove the pump head with rotor assembly as follows:
.
Pumps manufactured after October 1998 and later, have a sin-
gle piece, flex coupling. Therefore, the motor housing cover
must be moved enough to access the couplings set screw.
4
CAUTION
CAUTION
5. Remove the cover fasteners.
6. Carefully lift the cover, exposing the inner workings of the
pump.
7. Loosen the set screw holding the flex coupling to the rotor
shaft and remove pump head and rotor assembly.
8. Insert rotor shaft of new pump head assembly into coupling
and tighten the flex-coupling set screw to shaft keyway. Use
Loc-tite to secure the screw.
9. Secure new pump head to pump base with four (4) cap screws.
10. Place motor housing cover back to original position and secure
with original fasteners.
WARNING
Do not pinch wires or air lines when reassembling the
motor housing cover. Stripped, frayed, or exposed wires
can create an electrical hazard. Do not continue if damage
is suspected. Contact Graymills Customer Service to return
pump to Graymills for repair.
11. Install new pump tube, replace front half of pump head, and
secure with three (3) quick-release screws.
NOTE: Pumps manufactured before October 1998 have a two-
piece motor coupling. Therefore, the pump head and rotor assem-
bly can be removed from motor housing base with half of the cou-
pling still attached. Loosen the set screw and remove coupling
half. Attach coupling to shaft of new pump head and rotor assem-
bly by tightening the coupling set screw on the shaft keyway. Use
Loc-tite to secure the screw. Insert new pump head and rotor
assembly with coupling half into motor housing base
REPLACING THE O-RING
Slide the O-ring (A) over rotor assembly (B) shaft, then reseat bear-
ing (C) into housing (D) and reassemble the head. Note: O-ring is
important because it sets rotor spacing from the front pump head.
CLEANING AND MAINTENANCE
Inspect tube at frequent intervals for excessive wear.
Never allow liquids to enter the enclosure or to come into con-
tact with the motor or any part of the controls or electrical
system.
Painted versions of the pump's drive enclosure have a durable
powder coating. To maintain its protective qualities and clean-
ability, do not use steel wool, abrasive pads or cleaners.
In Event of Tube Break
CAUTION
If a tube breaks while still in the pump head, IMMEDIATE ACTION
must be taken to minimize damage to the pump and pump head.
1. Turn pump off immediately. Prevent ink/coating from flowing
into the motor/gear box housing. DO NOT TILT PUMP
BACKWARD.
2. Unscrew quick release screws and remove front pump head.
3. Remove broken tube and discard.
4. Remove ROTOR ASSEMBLY AND CLEAN IMMEDIATELY by
submerging into cleaning fluid compatible for use with your
ink/coating system. Be sure not to lose shaft keys. Be sure to
rotate rollers by hand so all ink/coating is flushed from inside
the rollers. This step is essential to maintain proper pump
performance. Do not allow ink to dry on any part of the
rotor. Wipe dry.
5. Clean the inside and outside of both pump halves, including the
bearings. If you are using water-based inks, the pump head
may be submersed in cleaning fluids that are water-based. If
you are using solvent-based inks and cleaning fluids, the bear-
ing could be damaged by immersion in VOC-type solvents. If
using solvent-based fluids, use only a wipe-down procedure on
(See Fig. 5, page 24)
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