Graco Therm-O-Flow 20, Instructions - Parts Manual

Page: 22 / 66

Service
22 309858K
Follower Service
Replacing Wipers
1. Follow Before Servicing procedure, page 21.
2. Separate the wiper joint, and bend back the strap-
ping that covers the clamp (107). F
IG
. 10.
3. Unscrew the worm gear, then remove the wiper
(102).
4. Thread the strapping through the new wiper (102).
5. Insert the strap end through the clamp (107) and
tighten.
6. Use a rubber mallet to pound the wiper around the
follower plate (101) until the wiper ends are butted
tightly together.
7. Apply a lubricant to the wipers (102). Use a lubricant
that is compatible with the material to be pumped.
Check with the material supplier.
Replacing Heat Sensors
1. Follow Before Servicing procedure, page 21.
2. Make sure the ram control lever is set to OFF.
3. Turn the CONTROL switch (65) to OFF. F
IG
. 5, page
17.
4. Turn OFF the main electrical disconnect.
5. Loosen the nut on sensor (119). F
IG
. 10.
6. Remove the sensor (119).
7. Loosen the cord grip (items 16, 17, 18 on page 30
or 23, 24, 25 on pages 32 and 34).
8. Open the electrical control box (13, on page 30).
9. Disconnect the 2 sensor wires. Note their location
and refer to the Electrical Schematic for your elec-
trical control, pages 48-55.
10. Connect the 2 wires from the new sensor (119) to
the sensor terminals.
11. Close the electrical control box.
12. Coat the sensor with non-silicone heat-sink com-
pound.
13. Slide the o-ring back into the cord grip, then tighten
the cord grip.
14. Slide the sensor (119) into the opening in the fol-
lower plate (101).
15. Tighten the conduit locknut on the sensor.
To replace wires connecting the follower to the
pump, see Manual 310530 or contact your Graco
distributor.
F
IG
. 10: Part No. 244754 shown
107 102
101
113, 114
119
For more information about the follower plate, refer
to pages 26-27.