ABB PGC5000 Series Service Instructions Manual page 69

PGC5000
PGC5000 Series Service Instructions
8. Remove the Carrier Assembly from the Valve Plate and Valve Body, being careful to keep the latches in their open
position.
9. Push the piston rod into the Valve Body to release the piston, being careful not to scratch any valve surfaces.
10. Remove the piston and piston rod from the Valve Body.
11. Remove the piston rod O-ring and the piston O-ring.
12. Wipe all surfaces of the piston and piston rod to remove contamination.
13. Verify that the screw holding the piston rod to the piston is tight.
14. Lubricate one O-ring part number 45051-4-11 with Molykote 33.
15. Position O-Ring Tool part number 3122-1 over the piston rod (see Figure 7.14).
PISTON O-RING
PISTON ROD
O-RING
Fig. 7.14. Installing the O-Rings on the Piston Rod and Piston
16. Install the O-ring over the O-Ring Tool and into the O-ring groove on the piston rod.
17. Lubricate O-ring part number 45051-4-61 (40-psig valve) or 45051-4-29 (60-psig valve) with Molykote 33 and install it in
the O-ring groove of the piston.
18. Remove the old O-ring from the Valve Body (see Figure 7.15).
O-RING
Fig. 7.15. Installing the O-Ring on the Valve Body
19. Wipe the inside of the Valve Body to remove contamination and old lubricant.
20. Inspect the piston rod bore to ensure the bore is clean.
21. Lubricate O-Ring part number 45051-4-35 (40-psig valve) or 45051-4-31 (60-psig valve) with Molykote 33 and install it in
the O-ring groove in the Valve Body.
22. Lubricate the piston rod and the inside of the Valve Body (the piston housing area) with Molykote 33.
23. Insert the piston rod and piston rod assembly into the Valve Body. Before seating the piston, ensure the flat surface on
the piston rod is facing up.
24. Insert the Carrier Assembly on the Valve Plate.
25. Close the back Carrier Assembly latch. This ensures the Carrier Assembly is locked into the hole in the piston stem.
SI/PGC5000-EN, Rev B
LOCKWASHER
PISTON
SCREW
PISTON ROD
INSTALLATION TOOL
VALVE BODY
7 Subassembly repair
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