Remove Platen; Replace Heater Band And Pump Rtd - Graco Therm-O-Flow 20 Instructions - Parts Manual

Repair

Remove Platen

1. Turn the Main Power Switch OFF.
2. Disconnect the Platen power wires and the ground
wire from within the main Control Panel and pull out
of conduit.
3. Remove the Platen assembly from the Ram.
4. Reverse this procedure to reinstall the new or
rebuilt Platen assembly.
Replace Heater Band and Pump
RTD
Replace Heater Band
1. If the material drum has already been removed from
the supply unit, go to step 2. If you need to remove
the material drum, perform steps 1 through 6 of the
Change Pail, page 37. Pump must be in the full
down position (Air Motor shaft fully extended).
2. Make sure the Ram plate is down and the Ram
Director Valve is in the neutral position.
3. Follow the Pressure Relief Procedure, page 34.
4. Bleed off excess material in the system by opening
the applicator and catching the material in a waste
container.
5. On ADM, turn off the system heat (D).
6. Turn the Main Power Switch OFF.
7. Remove the Pump covers.
52
8. Remove the white ceramic caps and disconnect
the electrical wires from the heater band (309a,
309b).
9. Remove the screw that holds the heater band in
place.
10. Remove the heater band (309a, 309b) from the
Pump.
11. Coat the inside of the heater with a non silicone
heat sink compound before mounting. Maximum
thickness is 0.005 in. Coat only to within 3/4 in. of
vertical ends.
12. Install a new heater band (309a, 309b) in the same
location as the old heater band:
a. Locate heater terminals so they line up with the
back of the Pump.
b. Tighten the heater band.
c. Re-connect the heater wires and re-attach the
ceramic caps that insulate the terminal.
320
321
F . 30
IG
Replace Pump RTD
1. Turn the Main Power Switch OFF.
309a
309b
ti25342a
334129S