Groth 3011L - Manual (Page 13)

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FIGURE 6: EXPLODED PISTON ASSEMBLY
Refer to "FLOW CAPACITY SETTING" and warnings on
Page 7 before removing the orifice selector sleeve [12] from
the body. Back the orifice lock screw [13] completely out of
the body. Before removing the orifice selector sleeve, make
note of its position by looking through the screw port. There
will be a number stenciled on the sleeve indicating the
position of the sleeve. Note this number for re-assembly.
Refer to Tables 4 & 5 to determine flow capacity of the
regulator at a specific orifice sleeve position.
FIGURE 7: ACTUATOR LINKAGE ASSEMBLY
FOR 3011 L / H & 3041 L / H
HP MODELS HAVE PISTON PIN
Clean and inspect the sleeve, body cavity and seat. Polish
or lap the seat if required to obtain a sharp but smooth
seating edge for the O-Ring.
All components should be examined for damage or wear.
Replace all diaphragms, O-Rings and gaskets. Prior to
reassembly, make sure all components are clean.
Inspect the actuator linkage assembly. The assembly is
riveted and should not be disassembled. All components
should be straight and flat. All rollers and pins must be free
to rotate and slide as the support plate moves vertically.
ASSEMBLY
Before assembly note the following material and tool
recommendations:
Diaphragms, O-Rings, gasket, vents and spring as listed in
Table 6.
Lubricants & Thread Sealants
A. Molykote No. 33 Light grease
B. Dry Moly Spray
C. Fluoropolymer tape
Assembly Tools
A. 7/16" – 9/16" box end wrenches
B. 1/4" or 3/8" open end wrench*
C. 1/2" socket wrench
D. Adjustable wrench
E. 1/8" hex wrench
*Wrench must be 8" long for 1/2" BGR or 12" long for
1" BGR flanged units