Emerson Daniel 762 User Manual page 100

Planned maintenance
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9.
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11.
12.
13.
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Figure 9-1: Models 762, 763, 765, 766 and 767 Control Valve jack screws and
spring
Product remains in the valve below the cylinder head in the piston. Place a drip pan
below the valve before starting step 4 (removal of the cylinder head).
Remove nuts; except the jack screws (long bolts).
Alternatively, loosen the remaining two nuts from threaded rods allowing the
cylinder head to slowly raise from the valve body and relieve spring tension. Oil from
the piston will flow into drip pan. It is important to avoid damaging or bending the
threaded rods during this operation.
Once spring tension is fully relieved, remove remaining nuts from threaded rods and
lift cylinder head and reservoir away from threaded rods.
Remove spring from valve.
Use a hand pump to remove the remaining oil from the cylinder/piston assembly.
Insert (2) 3/4" - 10 N.C. bolts with large washers behind bolt heads into threaded
holes in the cylinder.
Use a chain or other suitable lifting device attached to the bolts and carefully
remove the cylinder and piston from the valve body.
Secure the cylinder assembly and remove the piston from the cylinder by pushing
the bottom of the piston.
Remove (24) bolts (item 12) while holding the seal ring to the cylinder. Remove the
seal ring and the seat O-ring.
Inspect all components, remove any foreign material and replace O-rings, as
necessary.
Daniel Models 762, 763, 765, 766 and 767 Control Valves