1992 toyota camry tight steering

Be systematic about this
- you will have checked the fluid level in the separate P/S reservoir
- check the pump drive belt for tightness. Intermittent slipping can cause this symptom
- if your car has cooling fans hydraulically driven by the P/S pump (some Camrys do, some not) the fault may lie in that circuit. Look to see the fans run when hot and when you have no steering assist for a clue
- is there any difference between left and right when hard steering? If so it points to a faulty control valve

- air in the system will cause this intermittent behavior, but you said the air has been purged out? If not, jack up the whole front end, start the engine, and turn the steering wheel fully lock to lock a few times, checking the fluid level meanwhile
- then, it could be the overpressure relief valve in the pump is faulty. This can be replaced without replacing the pump. You will need a pressure gauge to check this, best done by a steering shop
- then, the seals in the steering rack could be worn, but the loss of power steering should not be just intermittent if so.
More details here
http://www.turboninjas.com/camry/sr.pdf

have you checked the power steering fluid level??? is the belt tight?

First check your power steering fluid for the proper level and check the belt.Also Get a Friend to sit in your car and turn your steering wheel giving you an idea of your problem area.But it sounds like the belt slipping on the power steering pump or its low power steering fluid level.

oil level in tank too low so air getting into system,the pump not generating the pressure.the seals on the rams worn the steering colum plate which moves the pump activaters

change the powersteering pump. It sounds like it is burnt out.

this can be the pump or the rack and pinion there is a silnoid in the rack that can go bad cause this problem

Power steering fluid - Dexron 2 or 3 automatic transmission fluid. Yes transmission fluid. And while you are at it check the fluid level in the transmission.
Since you got the hood up, check the brake fluid, wiper fluid, radiator fluid, battery fluid, oil level.

On the '92-95 V6 Camry, the radiator fan is hydraulically operated by the power steering fluid and power steering pump. If the fan isn't running as fast as it should be, check your power steering fluid level.

make sure the belt is tight but not too tight.

if the belt looks good and tight and the oil level on the pump is full replace the p/s pump