WHEEL & SHAFT AS 2W8332 - Caterpillar

Probable Causes
Problem 1 The steering metering pump makes noise and the steering cylinder rods do not move freely.Probable causes
There is a loose connection of the oil line on the inlet side of the pump.
The oil level in the hydraulic oil tank is low.
The viscosity of the oil is incorrect.
The pressure and flow compensator valve is adjusted too low.
There is air in the steering hydraulic circuit. Refer to Problem 10.
The pump has too much wear. Refer to Problem 4.
The suction screen in the tank is blocked.Problem 2 Too much force is needed to turn the steering wheel.Probable causes
The oil level in the tank is low.
The oil is cold.
The steering cylinders have failed.
The suction screen in the hydraulic oil tank is blocked.
The margin pressure or the standby pressure is too low.
The pressure cutoff valve is adjusted too low.
Oil pressure from the steering metering pump is low. The pump is worn. Refer to Problem 4.
The steering metering pump is damaged. Refer to Problem 9.
The operation of the relief valves are not correct. Refer to Problem 9.
The resolver in the quick coupler valve is not working properly.Problem 3 The machine does not turn when the steering wheel is turned.Probable causes
The steering frame lock is installed.
The oil level in the tank is low.
Dirt is in the hydraulic system.
Leaks can occur at these locations: the seals in the steering cylinder pistons, the accessory valve between the cylinder lines and the ports.
The operation of the steering metering valve is not correct.
The metering section of the hand metering unit has a lack of oil.
No oil flow is going to the hand metering unit.
Air is in the steering system. Refer to Problem 10.
The steering metering pump operation is not correct. Refer to Problem 9.
There is a restriction in the steering linkage. Refer to Problem 5.
The operation of the relief valves in the steering metering pump or the anticavitation valves in the steering metering pump is not correct. Refer to Problem 9.
The steering column upper shaft is loose or damaged.
The lower splines on the steering column may be disengaged or broken.
The resolver in the quick coupler valve is not working properly.Problem 4 The machine turns slowly in both directions.Probable causes
The steering axle is overloaded.
The operation of the steering metering pump is not correct.
The oil flow from the piston pump is low.
The margin pressure or the standby pressure is too low.
The seals in the steering cylinders leak.
The operation of the relief valves in the steering metering pump are not correct. Refer to Problem 9.
The resolver in the quick coupler valve is not working properly.Problem 5 The machine turns too slowly in one direction.Probable causes
The steering linkage is worn or damaged.
A seal in the steering cylinder leaks.
There is a restriction in the steering metering valve. Refer to Problem 9.
The operation of the crossover relief valve is not correct. Refer to Problem 9.Problem 6 The steering wheel does not return to the center position correctly.Probable causes
The pressure in the tank line is high.
The valve spool in the steering metering valve has