SUPPORT 6M1561 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Operational Checks
Note: The checks during operation can be used to find leakage in the system. These checks can also be used to find a bad valve, a bad pump, or a bad motor. Probable Causes of Problems in the Steering System
ProblemThe gear pump is noisy and the steering cylinder rods do not move easily. Probable Cause
The hydraulic oil is cold.
Air in the steering hydraulic circuit
The gear pump is worn.
There is a loose connection in the oil line that is connected to the inlet side of the steering pump.
The hydraulic oil level is low.
Viscosity of the hydraulic oil is not correct.ProblemToo much force is needed to turn the steering wheel.Probable Cause
The relief valve is open.
The hydraulic oil level is low.
The oil pressure in the gear pump is too low.
Metering