Repair; Rotor/Stator Pump Repair - Graco ToughTek MP-Series Operation Manual

Repair

Repair

Rotor/Stator Pump Repair

1. Before performing repair, flush the system (see
Flush, page 16).
2. Disconnect the mixing pump from the power source.
3. Remove the retaining nuts (31) and washers (32) to
disconnect the nozzle (29) and rotor/stator pump
(RS) from the hopper. Replace any parts if neces-
sary.
If Replacing Both the Rotor and the Stator
1. If not assembled together, join the new rotor (27)
with the new stator (28) by placing the stator (28) in
a vise and screwing in the rotor (27) using a flat bar
or wrench.
27
NOTE: Apply a lubricant to the rotor and stator before-
hand to improve ease of assembly.
NOTE: Do not screw the non-slotted end of the rotor
past the end of the stator. It should be flush or posi-
tioned slightly within the stator. If the rotor sticks out
past the stator end, the nozzle will not fit onto the end of
the ties rods correctly.
2. With the new rotor/stator assembly, join the stator
(28), o-ring (25), pump adapter (26), and flange
plate (FP) together.
3. Assemble the nozzle (29), nuts (31), and washers
(32). Torque the nuts to 60 ft-lb (81 N•m).
22
28
If Replacing Only the Rotor or the Stator
1. Place the rotor/stator pump (RS) assembly in a vise.
2. Turn the rotor (27) counterclockwise with a flat bar
or wrench to remove the rotor (27) from the stator
(28).
27
3. Replace the worn rotor (27) or stator (28) with a new
part, then screw the rotor (27) clockwise back into
the stator (28).
27
NOTE: Apply a lubricant to the rotor and stator
beforehand to improve ease of assembly.
NOTE: Do not screw the non-slotted end of the rotor
past the end of the stator. It should be flush or posi-
tioned slightly within the stator. If the rotor sticks out
past the stator end, the nozzle will not fit onto the
end of the ties rods correctly.
4. With the new rotor/stator assembly, join the stator
(28), o-ring (25), pump adapter (26), and flange
plate (FP) together.
5. Assemble the nozzle (29), nuts (31), and washers
(32). Torque the nuts to 60 ft-lb (81 N•m).
28
28
3A4349B