TUBE AS 2624217 - Caterpillar

Troubleshooting Problem List
The steering pump makes noise and the steering cylinder rods do not move freely. There are bubbles of air in the oil.
The temperature of the oil is too hot.
The output of a steering pump is low.
The pressure of the hydraulic oil is low.
The machine does not turn when the STIC is moved.
The machine attempts to turn when the machine is in a full turn. The STIC is moved in the direction of the turn.
The machine turns erratically.
The machine turns too slowly in both directions.
The machine turns too slowly in one direction.
The machine turns slowly in both directions when the machine turns against a load. The machine turns correctly when the machine is moving.
The machine turns slowly in one direction when the machine turns against a load. The machine turns correctly when the machine is moving.
The machine turns but the operator does not move the STIC.
The machine turns too quickly in order to make small steering corrections when the machine moves at fast speeds.Note: The numbers in this index do not indicate a sequence of importance. The numbers are used for reference only.Problem 1
The steering pump makes noise and the steering cylinder rods do not move freely. There are bubbles of air in the oil.Probable Cause
The viscosity of the oil is incorrect.
There is air in the steering hydraulic circuit.
The oil level in the hydraulic tank is low.
The relief valve opens at a low oil pressure.
There is a loose connection of the oil line on the inlet side of the steering pump.
The steering pump has too much wear.Problem 2
The temperature of the oil is too hot.Probable Cause
The viscosity of the oil is incorrect.
The relief valve opens at a low oil pressure.
A steering pump has too much wear.
The bypass check valve for the oil coolers is stuck open. This does not allow the oil to flow through the oil coolers.
There is a restriction in an oil passage.
The unloading spool in the secondary steering diverter valve is stuck in the CLOSED position.
The load on the steering system is too high.Problem 3
The output of a steering pump is low.Probable Cause
The oil level in the hydraulic tank for the steering and brake systems is low.
The viscosity of the oil is incorrect.
The pump margin pressure setting is too low.
The steering pump has too much wear.Problem 4
The pressure of the hydraulic oil is low.Probable Cause
The relief valve is not operating correctly.
The relief valve setting is lower than the pressure cutoff setting for the steering pump.
The pressure cutoff setting for the steering pump is low.
A steering pump has too much wear.
An O-ring seal in the steering system has failed.Problem 5
The machine does not turn when the STIC is moved.Probable Cause
The oil level in the hydraulic tank for the steering and brake systems is low.
A signal path may be blocked in the steering system.
An orifice may be plugged in the steering system.
The output of a steering pump is low.
There is contamination in the hydraulic system.
A steering pump has too much wear.
The pilot relief valve or the