M4 Maintenance Operations: 00–10

Table 1, M4 Maintenance Operations

Table 1, M4 Maintenance Operations

Table 2, M3 Maintenance Operations

1. Replace the HVAC air filter at the recommended interval or every six months.

Table 2, M3 Maintenance Operations

Table 3, M1 Maintenance Operations

1. Schedule III vehicles only.
2. If equipped with an oil-coalescing desiccant cartridge, replace the cartridge once a year, regardless of mileage. Otherwise use the M5 maintenance interval.
3. If equipped with an oil-coalescing desiccant cartridge, replace the cartridge once a year, regardless of mileage. Otherwise use the M5 maintenance interval.
4. Complete this procedure every 25,000 miles (40 225 km), 3 months, or 500 operating hours, whichever comes first.
5. The automatic drain valve should be inspected every 6 months or 1500 operating hours, whichever comes first.
6. M1 maintenance interval should be used as a general guideline; the actual frequency of filter element replacement will vary depending on cleanliness of the fuel station system.

Table 3, M1 Maintenance Operations

Table 4, M2 Maintenance Operations

1. Schedule II vehicles only.
2. Inspect the CNG fuel cylinder every 12 months regardless of mileage.

Table 4, M2 Maintenance Operations