3304 & 3306 NATURAL GAS ENGINES Caterpillar


Gas Pressure Regulator

Usage:

Remove Gas Pressure Regulator

NOTE: Photos shown are on 3306 engine.

1. Turn off gas supply valve and disconnect line to gas pressure regulator.

2. Remove clamp (1) from joint assembly.

3. Disconnect tube (2) (balance line) from the fitting on the gas pressure regulator.

4. Remove bolts (4) that hold the gas pressure regulator (3) in position on the braces.

Install Gas Pressure Regulator

1. Put gas pressure regulator (1) in position and fasten to braces (2).

2. Connect tube (4) (balance line) to the fitting on the gas pressure regulator (1).

3. Connect nipple (3) to the joint assembly with a clamp, bolt and nut. Tighten nut to a torque of 49 ± 4 lb.in. (5.5 ± 0.5 N·m).

4. Connect line to gas pressure regulator and turn on gas supply.

Disassemble Gas Pressure Regulator

start by:

a) remove gas pressure regulator

1. Remove the gas line (1) from the regulator.

2. Remove the valve seat from the tee fitting of the gas line.

3. Remove the retainer ring and coupling from the regulator.

4. Remove the fastening bolts (2) and cover (3) from the regulator.

5. Remove the spring (4) and diaphragm assembly (6) from the regulator.

6. Remove the valve (5) from the regulator.

Assemble Gas Pressure Regulator

1. Install the valve seat (1) in the tee fitting of the gas line.

2. Install the valve (3) in the regulator. Be sure the valve is engaged with lever (4).

3. Install the diaphragm assembly (2) in the regulator. Be sure the diaphragm assembly is engaged with the lever (4).

4. Install the spring and cover on the regulator.

5. Install the coupling and retainer ring on the regulator.

6. Install the gas line on the regulator.

end by:

a) install gas pressure regulator

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