General • Inspections

2010 Mack Natural Gas MRU,LEU: DAILY LNG/CNG FUEL SYSTEM CHECKS

Use this checklist for the maintenance of your Mack truck. Performing regular maintenance on your equipment has been proven to reduce repair costs for trucks and to avoid unnecessary damages.

MaintainX

12/28/2022

2010 Mack Natural Gas MRU,LEU: DAILY LNG/CNG FUEL SYSTEM CHECKS

Use this checklist for the maintenance of your Mack truck. Performing regular maintenance on your equipment has been proven to reduce repair costs for trucks and to avoid unnecessary damages.

Check for Methane Leaks or Loss of Vacuum

The LNG and CNG fuel systems are pressurized systems. Any damage to the fuel delivery system may result in leaks. All the tubing carrying liquid or gas fuel from the fuel tanks to the vaporizer are stainless steel. The tubing from the vaporizer throughout the remainder of the fuel delivery system is specialized high pressure tubing. Any damage to this system should be repaired as soon as possible.

During the daily walk around, check for any leaks or damage to the fuel system. The appearance of a vapor cloud accompanied by a hissing noise may indicate a methane leak. Inspect the outside of the fuel tank for frost (LNG only). A frosted tank indicates that the inner tank is leaking into the outer tank or there has been a loss of vacuum. Open the tank door; if the Evacuation Plug has popped out, the tank must be serviced. A leaking condition requires service before the vehicle is operated.

Note: Some frosting and sweating is normal around the plumbing fittings in the shrouded end of the tank.

MAINTENANCE AND LUBRICATION

Primary LNG Tank Vent Piping

From the factory, the vent piping from the primary LNG tank vents is attached to the intake stack by disposable plastic straps. The piping should be removed from the intake stack and plumbed up and over the body by the body installers.

Chassis-Mounted Charge Air Cooling (CMCAC)

Vehicles equipped with CMCAC require the following preventive maintenance:

Daily — Remove all insects, leaves and other foreign debris from the frontal area by using a firm bristle brush and soapy water.

* Whichever occurs first.

Source: MaintainX (Community Member)