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4.0 FIRST STAGE PROCEDURES
4.1 TOOLS REQUIRED FOR FIRST STAGE SERVICING
– Bench vise
– 3/32" Allen wrench
– 5/32" Allen wrench
– 6" or 8" adjustable wrenches
– 15" adjustable wrench
– Phillips screwdriver
– #10 Torx screwdriver
– Sherwood 50 cc Graduated Cylinder (p/n TL110)
– Sherwood Piston Seat Removal Tool (p/n TL112)
– Sherwood Plastic Probe (p/n TL111) to push out orifice
– Sherwood Regulator Support Handle (p/n TL113)
– Sherwood Intermediate Pressure Gauge (p/n TL119)
– Sherwood Inlet Filter Installation Tool (p/n TL115)
– Sherwood O-ring Installation Cones:
White-colored – p/n TL109 (for installing O-ring on piston tip)
Green-colored – p/n 38-TL107 (for installing O-ring onto moving orifice)
4.2 DISASSEMBLY OF FIRST STAGE
To view all the parts used in the first stage, fold out the front cover of this manual. The
circled numbers below refer to the corresponding numbers on the drawing.
1. Use 6" or 8" adjustable wrenches to disconnect all hoses from the first stage. Pull back the
hose protector from the inlet end of the hose. Inspect the hoses for wear. Pay particular attention
to the area where the metal ferrules meet the rubber hose material. Replace hoses if necessary.
2. Unscrew and remove the handwheel .
3. Remove the dust cap .
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NOTE
: For more information on Sherwood tools and their uses, see Sherwood’s Tools, Repair Kits and
Accessories - Assembly & Maintenance Guide, available from Sherwood.