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The valve stack is a series of blocks put together with
socket head cap screws. Each block contains a plastic
mixer (1205). The only reason to service this would be
if the material started to gel, if the color was being
changed, or before a long shut down. If the material
started to gel, the best place to start is the bottom block
where the catalyst is injected. There should be no gell-
ing above that point. To disassemble the valve stack:
1. Perform Shutdown, page 17.
2. Remove the base hose from the Swivel Fitting
(1217) at the top of the stack.
3. Remove the inhibitor, catalyst and color valves from
the valve stack. Remove the Bolts (705) from the
Plate (938).
4. Turn off the flow of coolant to the Cooling Jacket
(704) and Block (1309) and relieve any coolant
pressure.
5. Remove the Cooling Jacket (704) from the Pipe
Mixer (1308).
6. Remove the Pipe Mixer (1308) and valve stack from
the screw on the press.
7. Remove the Cooling Block (1309) from the valve
stack
8. Move the stack to a bench to disassemble.
9. Carefully use a pipe wrench to remove the Pipe
Mixer (1308).
10. Remove the bottom four Socket Head Screws
(1213) from the Bottom Outlet Block (1208).
11. Remove the Bottom Outlet Block (1208) from the
Catalyst Pump Port (1203).
12. Remove the Plastic Mixer (1205) from the Block
(1208).
NOTE: The old mixer should be replaced with a new
one each time.
13. Remove the Top Inlet Block (1201) from the Inhibi-
tor Pump Port (1203) by removing four Socket Head
Cap Screws (1212).
14. Remove the Plastic Mixer (1205).
15. Remove the four Socket Head Cap Screws (1213)
in the Inhibitor Pump Port Block (1203).
3A2152B
16. Remove the Inhibitor Pump Port Block (1203).
17. Remove the four Socket Head Cap Screws (1213)
from either the Spacer Block (1206) or the Color
Block (1206) if using kit 24M126.
18. Remove the Mixer (1205) from this Spacer Block
(1206) or Color Block (1206).
Before reassembly, check all sealing surfaces for
scratches. Make sure any traces of silicone are
removed. Replace the Plastic Mixers (1205), the Top
Inlet Block Oring (1202), and the other Block Orings
(1204). Use an oring lubricant on the seals to reassem-
ble.
Reassembly is the reverse of disassembly. Be sure the
plastic mixers are positioned correctly with the small
step facing up as shown. Refer to F
Repair
. 18.
IG
45
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