Freightliner Century Class Trucks Maintenance Manual

Scheduled maintenance provides a key element for the safe operation of your vehicle. A proper maintenance program also helps to minimize downtime and to safeguard warranties. This maintenance manual provides information necessary for years of safe, reliable, and cost-efficient vehicle operation.

Lubrication and Fluid Level Check:
Maintenance Operation 00–04, Lubrication and Fluid Level Check Operation Table 8 summarizes all operations that must be performed to complete the Lubrication and Fluid Level Check operation 00–04 called for as an M1 maintenance interval for Service Schedule I, II, and III vehicles, and as an M2 maintenance interval for Service Schedule IV vehicles. Maintenance operation numbers given in the table are reference numbers used to help you find detailed instructions in the manual on the lubrication or fluid check.

Initial Maintenance (IM) Operations:
The Initial Maintenance table lists all maintenance operations that are to be performed at the initial maintenance (IM) interval. Maintenance operation numbers are reference numbers used to help you find detailed instructions in this manual on the maintenance operations to be performed. All operations listed in the table, along with the operations listed in the applicable M1 maintenance interval table, must be performed to complete the initial maintenance (IM).

M1 Maintenance Interval Operations:
The M1 Maintenance Interval Operations tables list all maintenance operations that are to be performed at the M1 maintenance interval. Maintenance operation numbers are reference numbers used to help you find detailed instructions in this manual on the maintenance operations to be performed.

M2 Maintenance Interval Operations:
The M2 Maintenance Interval Operations tables list all maintenance operations that are to be performed at the M2 maintenance interval. Maintenance operation numbers are reference numbers used to help you find detailed instructions in this manual on the maintenance operations to be performed. Perform all M1 maintenance interval operations at the M2 maintenance interval.

M3 Maintenance Interval Operations:
The M3 Maintenance Interval Operations table lists all maintenance operations that are to be performed at the M3 maintenance interval. Maintenance operation numbers are reference numbers used to help you find detailed instructions in this manual on the maintenance operations to be performed. Perform all maintenance interval operations in M1 and M2 when performing M3 maintenance interval operations.

Recommendations for Replacement Parts
Replacement parts used for maintenance or repair of noise emission controls should be genuine Freightliner parts. If other than genuine Freightliner parts are used for replacement or repair of components affecting noise emission control, the owner should be sure that such parts are warranted by their manufacturer to be equivalent to genuine Freightliner parts in performance and durability.

Engine Drive Belt Inspection
Worn or loose drive belts may cause premature bearing failure or engine overheating. Excessive tension, or too little tension on the belt may result in excessive and premature belt wear. Poly-V belts, or serpentine belts are retained by a belt tensioner that requires no tension adjustment. Replace the belt if any conditions described in "Visual Inspection" are found. V-belts are installed as individual belts, and as matched sets. When replacing matched sets of belts, always replace both belts at the same time. Matched belts must be from the same manufacturer. To inspect a belt, gently twist the belt to view the belt sidewalls and bottom. Inspect all drive belts for the following conditions, then perform the "Belt Tension Inspection":

Spring-Tension Type
On belts equipped with a spring tensioner, the belt tension is automatically adjusted. Check that the tensioner is holding tension on the belt by inserting the end of a breaker bar in the 1/2-inch square hole on the forward face of the tensioner, and rotating the tensioner down, away from the belt. When the breaker bar is slowly released, the tensioner should return to its original position. If not, see Group 01 of the Century Class Trucks Workshop Manual for replacement instructions.

Engine-Support Fasteners Check (Noise Emission Control)
Front and rear engine supports for vehicles built from January 7007 require no periodic maintenance. Mounts should be inspected when the engine is removed for service. For vehicles manufactured prior to January 2007, perform the following check.

Check the rear engine-support fasteners (see Fig. 3, Ref. 4) for tightness. Tighten the 3/4-inch fasteners 215 to 265 lbf·ft (292 to 359 N·m). Check the front engine-support fasteners for tightness. Tighten the 5/8-inch fasteners 125 lbf·ft (170 N·m).

Air Cleaner Element Inspection and Replacement
Replace the air cleaner element at the recommended interval or when the air restriction indicator reaches 20 inH2O on a vehicle with a Detroit Diesel engine, 22 inH2O on a vehicle with an MBE engine, or 25 inH2O on a vehicle with a Caterpillar or Cummins engine. For replacement instructions, see Group 09 of the Century Class Trucks Workshop Manual. Reset the air restriction indicator.

If the maximum restriction is not reached, record the air restriction value. If the value is higher than the previous recording, reset the air restriction indicator. If the value is lower than the previous recording, inspect the air cleaner and air cleaner element of cracks, leaks, or any other damage.

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