Freightliner Trucks Business Class Truck MB50

Clean any dirt, gravel, and other foreign debris from the plunger boot and brake base bracket.

Check the brake plunger boot for cracks, holes, or deterioration. Replace if necessary.

Lift up the edge of the brake plunger boot and check the plunger for existing lubrication.

If the plunger is dry, remove it by removing the cotter pin from the clevis pin and pulling the clevis pin out. Remove the piston rod and boot. Lift out the plunger. Lubricate the plunger and the tip of the piston rod with barium grease part number BW 246671, or Penzoil Adhezoplex EP 2. Install the piston rod, boot, clevis pin, and cotter pin.

If the plunger has grease on it, lift the edge of the brake plunger boot enough to apply 2 to 4 drops of light oil around the brake plunger. Do not over-oil. Install the plunger boot.

Lubricate the clevis pin with light oil.

Check for leakage; see Group 42 of the Business Class® Trucks Service Manual for instructions.

Sign off on the Foot Brake Valve Actuator Lubrication

1. Park the vehicle on a level surface and apply the parking brakes.

2. Run the engine until the transmission fluid reaches the operating temperature of 160° to 200°F (71° to 93°C). Shift the transmission to neutral (N) and shut down the engine.

CAUTION: To prevent dirt from entering the transmission, use only clean containers and fillers for the transmission fluid. Do not use fillers or containers that have been used for water or antifreeze. Dirt, water, or antifreeze could damage the transmission.

3. Clean the area around the drain plug. While the transmission fluid is warm, remove the drain plug and drain the fluid. Disconnect the fill tube from the oil pan.

IMPORTANT: Examine the used transmission fluid for dirt, coolant or water, and metal particles. If any of these contaminants are present, a problem may exist within the transmission system.

4. Support the oil pan, then remove the twenty-one washer-head screws that attach the oil pan to the transmission case. Remove the pan, and discard the pan gasket.

5. Clean the oil pan with mineral spirits.

6. Remove the washer-head screw that attaches the internal fluid filter to the filter spacer, then remove the filter and discard it. See Fig. 5. Remove the fluid intake tube, and then remove the seal ring from the intake tube, and discard the seal ring.

CAUTION: Failure to retorque the U-bolt nuts could result in spring breakage and abnormal tire wear.

Vehicle parked on a flat surface and parking brakes applied

Tires chocked to prevent the vehicle from moving

U-bolt torque checked in a diagonal pattern

Set a click-type torque wrench to the highest torque value for the fastener being checked

Turn the wrench in a clockwise motion (looking up) until the torque wrench clicks

Sign off on the U-Bolt Torque Check

Warning: This procedure requires trained personnel with PPE!

Note: For off-highway operations, retorque the frame fasteners the first 1000 miles (1600 km), then periodically, depending on the operating conditions.

Caution: Continued vehicle operation with insufficiently tightened fasteners could result in bracket or frame damage.

Front frame brackets torqued correctly

Suspension brackets torqued correctly

Spring brackets torqued correctly

Fuel tank supports torqued correctly

Exhaust supports torqued correctly

Engine supports torqued correctly

Park the vehicle on a level surface and apply the parking brakes.

CAUTION: To prevent dirt from entering the transmission, use only clean containers and fillers for the transmission fluid. Do not use containers or fillers that have been used for water or antifreeze. Dirt, water, or antifreeze could damage the transmission.

While the transmission fluid is warm, raise the vehicle, remove the oil pan, and drain the fluid.

IMPORTANT: Examine the used transmission fluid for dirt, coolant or water, and metal particles. If any of these contaminants are present, there may be a problem within the transmission.

Remove the three filter screws. Remove the filter from the valve body.

Position the new filter on the valve body and install the filter screws finger-tight.

Tighten the filter screws 35 lbf·in (400 N·cm).

Install the oil pan bolts and tighten them 13 lbf·ft (17 N·m).