35
Piston Replacement
1.
Close all ball valves within feed systems unique to the machine.
2.
At the pump outlets close the material hose ball valves.
3.
Open the ratio check ball valves.
4.
Place clean container under both ratio check nozzles to collect recyclable materials.
5.
From the SHOT FLOW screen, do the Material Pump Servo Start Up Sequence
(if required)
,
press the CONT button. Press the start device.
7.
Allow the machine to cycle until empty, then press the OFF button.
Traces of material will remain in the bottom the pump even when flow ceases.
8.
When the pump is drain of material, press the RETRACT button.
9.
Press the OFF button.
10.
Place rags under the pump outlet; remove the three socket-head cap screws on each side and
remover the metering tube.
When removing the 3 socket-head cap screw, there will be a tremendous vacuum.
Tightly grip the metering tube and pull hard to remove if from the housing.
11.
Press the SHOT button under under PUMP MODE.
12.
From the SHOT FLOW screen, set the FLOW RATE button/indicator to a low flow rate.
13.
Press the EXTEND button. The piston will move forward, exposing it self from the housing.
14.
Press the OFF button if the piston is in the desired position.
15.
Press and release the EMERGENCY STOP to shut off power to the machine.
16.
Remove and replace the piston, locknut and washers. Add PTFE tape to piston shaft installation
area so that the piston fit snug
(do not apply PTFE tape to the point that the tape will roll to
the back of the piston when the piston is fitted on the shaft),
tighten the locknut until the piston
cannot be rotated by hand, then tighten it one-quarter turn more.
Pistons may not have front and rear washers. Check the assembly drawings included with the
manual.
17.
Press the POWER ON button. MAIN Screen appears. Press the SHOT FLOW button.
Piston Replacement is advise when piston wears to the point that it will no longer seal against
the metering tube, thus producing inaccurate output.
