Table ll-3.-troubleshooting the Power Takeoff

vehicles and trucks usually have universal joints at both have grease fittings, use a low-pressure grease gun to ends of the propeller shaft. avoid damaging seals.

Universal joints are double-hinged with the pins of the hinges set at right angles. They are made in many different designs, but they all work on the same principle.

Normally, universal joints do not require any maintenance other than lubrication. Some universal joints (U-joints) have grease fittings and should be lubricated when the vehicle has a preventive maintenance inspection. Others may require disassembly and lubrication periodically. When lubricating U-joints that

TROUBLESHOOTING THE DIFFERENTIAL

The purpose of the differential is easy to understand when you compare a vehicle to a company marching in mass formation. When the company makes a turn, the members in the inside tile must take short steps, almost marking time, while members in the outside file must take long steps and walk a greater distance to make the turn. When a motor vehicle turns a corner, the wheels

Figure 11-46. - An example of a splined slip joint and a commontype of universaljoint.