Graco 25D117, Операция

Страница: 24 / 50

Maintenance
24 3A5354B
Platen Maintenance
If the platen does not come out of the pail easily when
the pump is being raised, the blow off tube or check valve
may be plugged. A plugged valve prevents air from
reaching the underside of the plate to assist in raising it
from the pail.
1. Lower the platen completely.
2. Turn the main power switch (MP) OFF.
3. Disassemble the electric cable from the receptacle of
the platen.
4. Perform the Pressure Relief Procedure on page 20
and follow the Pressure Relief Procedure in your
pump manual.
5. Disassemble the blow off tube (H) from the blow off
valve.
6. Loosen the set screw (Z), see F
IG
. 23.
7. Jog the director valve (BC) up to separate the platen
from the pump.
8. Clear the blow off tube in the platen. Clean all parts
of the valve and reassemble.
9. Remove the bleed stick (DE) from the platen. Push
the bleed stick through the bleed relieve port (G) to
remove material residue. See F
IG
. 23.
10. Remove the platen covers. See F
IG
. 23.
a. Remove the platen cover fasteners and nuts (V).
11. Disconnect the heater block (X) from the platen.
Remove the screws (W) from the upper heater plate
(X). Remove the upper heater plate.
12. Remove any excess fluid. Use a soft wire brush on
the heater (Y). See F
IG
. 23.
13. Inspect the platen heater blocks (X) and heater (Y)
for burn or melt spots. Replace the platen heater
blocks or heater if necessary. See F
IG
. 23.
14. Check for loose connections and damaged wires.
15. Follow these steps in reverse order to reassemble
the platen.
NOTE: Torque the nuts (V) to 45 +/- 5 in-lbs (5.1 +/- 0.6
N•m) for smaller platens.
F
IG
. 22: Blow Off Tube
H
F
IG
. 23: Remove Platen Covers and Heaters
DE
G
V
V
W
X
Y
Z