Freightliner Trucks Business Class Truck MB80

WARNING: Fill only with approved clean fluid. Do not mix fluid types. Any mixture or any unapproved fluid could lead to seal deterioration and leaks. Fluid leakage could cause loss of power steering assist.

IMPORTANT: Do not start the engine while draining the system.

Remove the dipstick, 3/8–16 hexnut, and cover.

Drain the power steering reservoir by disconnecting the power steering gear-to-reservoir hose from the reservoir.

Catch the fluid from the reservoir in a drain bucket, then cap the reservoir port.

Lift out the spring and filter element.

Thoroughly clean the reservoir with a lint-free cloth.

Install a new filter element, and position the spring on top of the filter element.

Fill the reservoir with approved power steering fluid.

DANGER: Do not loosen or remove the parking brake clamp ring for any purpose at any time. Serious injury or death may result from sudden release of the power spring.

WARNING: Do not operate the vehicle with the front brakes backed off or disconnected. Backing off or disconnecting the front brakes will not improve vehicle handling and may lead to loss of vehicle control resulting in property damage or personal injury.

NOTE: Vehicles operating under severe or adverse conditions should be checked more frequently.

With the slack adjuster properly adjusted, is the angle formed by the centerline of the piston rod and slack adjuster greater than 90 degrees in the released position and approach 90 degrees in the applied position?

Is each brake chamber correctly installed?

Is each mounting stud for the presence of prevailing torque locknuts and hardened flatwashers?

Are the hardened flatwashers installed between the mounting bracket and the locknuts?

Is the piston rod engagement with the clevis at least 7 threads?

Is there 1-inch (25-mm) clearance from the centerline of the clevis pin hole to the end of the piston rod?

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 engine drive belt if any conditions described in the visual description are found.

V-belts are installed as individual belts, and as matched sets. When replacing a matched set 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. Visually inspect all drive belts for the following conditions, then perform the belt tension inspection.

1. Inspect the belt for glazing. See Fig. 2, Ref. A. Glazing is represented by shiny sidewalls, and is caused by friction created when a loose belt slips in the pulleys. It can also be caused by oil or grease contamination on the pulleys.

2. Check the belt for ply separation. See Fig. 2, Ref. B. Oil, grease, or belt dressing can cause the belt to fall apart in layers. Repair any oil or coolant leaks that are affecting the belts before replacing the drive belts. Do not use belt dressing on any belt.

3. Check the belt for a jagged or streaked sidewall. See Fig. 2, Ref. C. Jagged or streaked sidewalls are the result of foreign objects, such as sand or gravel in the pulley, or a rough pulley surface.

4. Check for tensile breaks (breaks in the cord body). See Fig. 2, Ref. D. Cuts in a belt are usually caused by foreign objects in the pulley, or by prying or forcing the belt during removal or installation.

5. Check for uneven ribs on serpentine (poly-V) belts. See Fig. 2, Ref. E. Foreign objects in the pulley will erode the undercord ribs, causing the belt to lose its gripping power.

6. Check the drive belts for cracks. See Fig. 2, Ref. F. Small irregular cracks are usually the signs of an old belt.

Remove the shift unit housing cover and drain the old lubricant

Discard the housing cover gasket and the old lubricant

Wash the axle shift parts and housing cover

Air dry the axle shift parts and housing cover

Install the housing cover and a new housing cover gasket

Tighten the housing cover capscrews to 90 to 110 lbf·in (1020 to 1240 N·cm)

Remove the oil fill hole plug from the cover

Fill the shift unit housing through the oil fill hole until the specified lubricant is level with the bottom of the opening

Select the type of lubricant used

Check the reservoirs for moisture

Amount of moisture found in reservoirs

Check the mounting and connecting lines

Tighten the fasteners attaching the air dryer to the vehicle to 28 lbf·ft (38 N·m) for SAE grade 5, 3/8–16 fasteners

Tighten the fasteners attaching the air dryer to the vehicle to 135 lbf·ft (183 N·m) for SAE grade 5, 5/8–11 fasteners

Check all air lines, fittings, and electrical connections for damage, leakage, or looseness

List of damaged or leaking parts

Replace damaged or leaking parts, and tighten loose fittings or electrical connections

Sign off on the air dryer inspection