Dover HEIL Half/Pack Factor AFL - CNG Fuel Module Maintenance and Part Replacement

To Next Page

To Previous Page

Half/Pack

Issued April 2018

Compressed Natural Gas (CNG) Option

Printed in the U.S.A.

Compressed Natural Gas (CNG) Option

183

CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT

A. Fuel Filter Location / Access Procedure

1. Locate the fuel filter inside the side maintenance access door of the CNG Fuel Module .

2. Follow instructions in Preparation before Maintenance to ensure pressure has been relieved.

3. When the unit has been fully depressurized, it is safe to remove the fuel filter.

DANGER

To avoid serious injury or death, the flow of fuel to the filter must be shut off and pressure within the filter must be relieved

before servicing the fuel filter.

B. O-Ring Information

The O-rings installed throughout the fuel module are Hydrogenated Nitrile (HNBR) O-rings. Recommended lubricants

for use with these O-rings include:

Super O-Lube, Parker -65 to 400

DC-55, Dow Corning Co. -65 to 275

Celvacene, Consolidated Vacuum Corp. -40 to 200

C.Procedure for Draining the Filter Bowl

Preventive Maintenance Schedule for the Filter Bowl:

Drain the filter every 10,000 Miles.

Alter the preventive maintenance schedule to 5,000 Miles if high volume of oil (>10 ml) is present in filter bowl.

1. Follow instructions in Preparation before Maintenance to ensure pressure has been relieved.

2. Locate the fuel filter following directions in Preparation before Maintenance and Compressed Natural Gas

(CNG) Fuel Module section.

3. A plugged drain port is located on the bottom of the filter bowl.

4. Use a 9/16” socket or wrench to remove the plug. Allow liquid to drain from the filter bowl.

5. Measure the amount of drainage.

6. Adjust the preventive maintenance schedule if necessary, based upon the amount of oil present.

7. Check the O-ring for damage or debris. Replace if necessary.

8. Reinstall the drain plug. Torque to 15 ft.-lbs.

9. Close the pressure bleed valve.

10.Slowly OPEN one (1) supply tank valve.

CAUTION

Test the plug with leak detector before opening all tank valves. If a leak is detected, check for debris and replace the O-

ring, first following the Preparation before Maintenance steps.

179

182

179

182