777F Off-Highway Truck Steering System Caterpillar

Visual Inspection

Usage:

777F JRP

A visual inspection of the steering system and the components is the first step when you identify a problem.

Show/hide table

Personal injury or death can occur if personnel are trapped between the wheel and the frame.
The steering system is hydraulically controlled and wheels can crush personnel during movement.

Use caution when working between the wheels and the frame. If the wheels must be turned, ensure that all personnel are clear of the machine before any movement.

Show/hide table

Do not check for leaks with your hands. Pin hole (very small) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use cardboard or paper to locate pin hole leaks.

Check all oil lines and connections for damage.

Check the pump and connections for damage and leaks.

Follow the pump lines to the tank and valves. Check the lines for damage and leaks.

Check the oil tank for damage and leaks.

Check the tank oil level.

Show/hide table




Illustration 1	g01268155
Steering disable valve (1) Sampling port for steering oil

The sampling valve for the steering oil is located on the steering disable valve. This sampling valve can be accessed on the steering hydraulic tank.

Remove the filter elements. Check for particles that were removed from the oil by the filter elements. A magnet will separate ferrous particles from nonferrous particles (piston rings, O-rings, or seals).