TANK GP-FUEL 1077243 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before the test is done.
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, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® 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. Operational checks can be used to determine if a valve, a pump, or a motor is bad.Probable Causes of Problems in the Steering System
ProblemThe steering pump is noisy and the steering cylinder rods do not move easily.Probable Cause
Air in the steering hydraulic circuit
The steering 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.
The strainer inlet in the hydraulic tank is plugged.
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 steering pump oil pressure is too low.
Steering control unit covers are too tight.
The steering control unit is worn.
The hydraulic oil is cold.
Alignment of steering column is not correct.
The priority valve is restricted or worn.
One of the steering cylinders is not functioning properly.ProblemThe machine does not turn when the steering wheel is turned.Probable Cause
The hydraulic oil level is low.
There is air in the hydraulic system.
There is dirt in the hydraulic system.
Steering pump operation is not correct.
The frame articulation is locked because the lock pin is in the hole in the yoke.
One of the steering cylinders has worn piston rings.
The priority valve does not allow enough oil to go to the steering control unit.ProblemThe machine turns slowly in both directions.Probable Cause
There is not enough oil flow from the steering pump.
Steering pump suction line is restricted.
Steering control unit operation is not correct.
Seal leakage in the steering cylinders.
The priority valve spool that is inside the steering pump does not allow enough oil to go to the steering control unit.
The pressure in the steering circuit is too low.ProblemMachine turns slowly in one direction.Probable Cause
There is a restriction in the steering control unit.ProblemThe steering control