TURBOCHARGER GP 1318687 - 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
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. Performance Tests (Steering System)
Tests for Steering system performance can diagnose poor performance. The tests also help isolate the source of oil leakage inside the hydraulic system.Probable Causes of Problems in the Steering System
ProblemThe steering pump makes noise, and the steering cylinder rods do not move smoothly. Probable Cause
The steering hydraulic circuit contains air bubbles.
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.
The strainer in the hydraulic tank is plugged.ProblemToo much force is needed to turn the steering wheel.Probable Cause
The relief valve in the metering pump is stuck open.
The hydraulic oil level is low.
System pressure is too low.
Metering pump covers are too tight.
The steering cylinder contains an internal leak.
The metering pump is faulty.
The bearing for the bolster pin is worn or damaged.
The hydraulic oil is cold.
Alignment of steering column is not correct.
The return pressure in the steering system is excessive.
The surface conditions may not allow turning while the machine is stationary.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.
The steering cylinder contains an internal leak.
The steering pump has failed.
The steering control unit is faulty.ProblemThe machine turns slowly in both directions. Probable Cause
There is not enough oil flow from the gear pump.
The suction line in the gear pump is restricted.
The metering pump is faulty.
The steering pump has failed.
The seals of the steering cylinder have failed.Note: It is normal for systems with a single cylinder to