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OPERATOR'S MANUAL 300-301
300-301 FLOW GUN 1/4 inch SEAT TUNGSTEN CARBIDE
IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING, OPERATING,
OR SERVICING THIS EQUIPMENT
WARNING:
Always wear eye protection when operating this gun.
Do not use damaged, frayed or deteriorated material
hoses or fittings.
SERVICE KITS
Use only Johnstone replacement parts to insure
compatibility and longest life.
• 300-301RK Repair Kit
• 300-919 Valve Rod Assembly
WARNING:
DO NOT OPERATE FLOW GUN AT PRESSURES
ABOVE RECOMMENDED MAXIMUM OF 4000PSI
(272 BAR) MATERIAL AND 100PSI (6.8 BAR) AIR.
SPECIFICATIONS
Material Inlet Port Size 3/8" NPT
Material Outlet 1/4” orifice
Nozzle connection 400-667 Collar
MAINTENANCE SCHEDULE
DAILY:
Check for material leakage.
Check for Frayed or damaged hoses.
Depressurize when not in use.
OPERATION
Supply material to the flow gun.
Adjust Material Pressure to flow gun until desired
material flow is achieved. (Material Regulator)
Adjust the trigger spring pressure until the Flow Gun
closes while under pressure. Turn the Adjusting screw
clockwise to increase pressure and counter-clockwise
to decrease pressure.
REPLACEMENT PROCEDURE
Depressurize the Flow Gun
Disconnect the 3/8” NPT fitting from the Gun
inlet and remove the Nozzle.
Connect new Flow gun to the 3/8” NPT.
Install new nozzle.
To bleed air out of the Flow Gun- Operate the
Flow Gun until the air stops coming out.
Johnstone Dispensing Systems 1872 Enerprise Drive PH (248) 293-5700
300-301.doc Rochester Hills MI 48309 FX (248 ) 293-5800 March15, 2000
3/8” NPT
MATERIAL INLET
BODY
TRIGGER
COLLAR
ADJUSTING
SCREW