SHEET AS-RH 1425807 - Caterpillar

Personal injury or death can result from machine articulation or movement. Machine frames can move and a person can be crushed.Connect the steering frame lock between the front and rear frames before working on the machine.
Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Performance tests for the steering system can be used for a diagnosis of poor performance and for finding the source of oil leaks inside the hydraulic system.This section provides probable causes to a known problem. Since there may be several probable causes, specific inspections or specific instrument tests may be recommended. These inspections and tests will help to identify the cause that is most probable.Note: Make sure that you use hydraulic oil with the correct viscosity for the ambient temperature and for the operating conditions. To determine the correct oil viscosity, see the reference that follows.ReferenceFor additional information about the various lubricant viscosities, refer to Operation and Maintenance Manual, "Lubricant Viscosities".Problem 1: The machine turns slowly when the STIC steering control is moved.Probable causes:
The oil is too cold.
There is a restriction in the pilot lines of the STIC steering pilot valve.
The pilot lines to the STIC steering pilot valve are not connected to the correct ports.
Steering pump pressure is low.Problem 2: The machine responds slowly when the machine is steered quickly from a full turn.Probable cause:
The steering neutralizer valve does not move freely.Problem 3: The STIC steering control attempts to turn the machine when the machine is in a full turn.Probable causes:
The adjustment of the cams for the steering neutralizer valves is not correct.Problem 4: The machine does not turn easily.Probable cause:
The steering control valve spool does not move freely.Problem 5: The machine turns too slowly in both directions.Probable causes:
The stroke limiters for the steering control valve spool are not adjusted correctly.
There is not enough flow from the steering pump.
The steering control valve spool does not move all the way.
The steering relief valve is not adjusted correctly.
The steering cylinder piston seals are worn.
The pilot oil pressure is low.Problem 6: The machine turns too slowly in one direction.Probable causes:
The stroke limiter adjustment of the steering control valve spool is not correct.
The line relief and makeup valve adjustment is not correct.Problem 7: The machine turns slowly in both directions only when the machine