DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual
February 15, 2022 PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED
FCCC MT CNG
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FCCC MT CNG
DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual
February 24, 2022 PRINTED AND DOWNLOADED COPIES ARE NOT CONTROLLED
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Safety FCCC MT CNG
General Safety Precautions
Observe all recommendations below when operating or servicing aCNG fuel system.
Strict compliance with proper safety and handling practices is essential when
operating aCNG fuel system.
1. Verify parking brake is engaged, wheels are chocked, and ignition switch is in OFF position.
2. Follow all maintenance procedures in the order in which they are written, do not skip steps unless with explicit
permission from Hexagon Agility®.
3. Never use an open flame as a source of illumination in proximity to a CNG system. Natural gas is both volatile
and explosive.
4. Any process or procedure that generates sparks, flames, or heated particles is never applicable in designated
CNG area.
5. If a CNG system does require a process or procedure that generates sparks, flames, or significant heat, refer
to ENP-442 for all Hot Work guidelines.
6. CNG fuel delivery systems are to be serviced in designated areas that comply will all federal, state, and
municipal laws and regulations.
7. When performing service or repairs to any portion of the fuel system, install proper lockout/tagout (LOTO)
device and observe all LOTO practices.
8. CNG servicing and fueling areas must be well ventilated as stipulated by federal, state, and municipal law.
9. Perform all maintenance and service procedures in a dust free environment.
10. Never attempt to open system components that are under pressure.
11. Never attempt to depressurize or vent a system by loosening a fitting.
12. A portable fire extinguisher rated for natural gas must be installed on the vehicle in an easily accessible
location.
13. Do not start engine if a CNG leak is detected.
14. Verify all systems are grounded before transferring CNG fuel from one vehicle to another. Transferring CNG
may cause a buildup of static electricity which could discharge and ignite the fuel.
15. Fuel system working pressure is up to 4500 psi (310.2 Bar). Hot weather fill pressures commonly reach 4100
psi (282.6 Bar).
16. Never smoke or produce an open flame near or around a CNG vehicle or a CNG dispensing/filling station.
17. Always ground vehicle prior to fueling or defueling.
18. If the vehicle will be out of service for an extended time, turn the 1/4-turn manual shut off valve to the
OFF/CLOSED” position. To consume residual CNG forward of the 1/4-turn manual shutoff valve run the
engine until it stalls.
