Blog / FAQ: Lexus LX470 and Toyota Landcruiser 100 accumulators.

11 Mar 2015 | Author: | Comments Off on Blog / FAQ: Lexus LX470 and Toyota Landcruiser 100 accumulators.

The and Toyota accumulators are factory with nitrogen to several PSI. The gas is on the top side of an internal separating the gas from the AHC oil.

The gas leaks through the diaphragm like air leaks out of a tire, much slower.

Eventually (after 4 to 6 years, or 50K to miles) enough gas has leaked the accumulator becomes mostly oil like the shock. Then, driving over a bump, the oil has no to go and the shock cannot compress—and the gets tossed up and rides bouncy.

Q: How can I test the accumulators to be they are causing the bumpy

A: There are two methods of testing the Lexus advises that you change the height setting ‘low’ to ‘high’, the oil level in the AHC should lower by more 7 graduations on the reservoir (new will change level by than 12 graduations.) Since pressure is needed to raise the some of the oil goes into the to raise the level, the rest the accumulators, compressing the remaining

The other method is to set the vehicle at ride height and then real hard on each to see how much the shock will With flat accumulators, will not be much ‘give.’ New accumulators will allow inches of movement when you hard on the corner. Another way of this is to drive each over a speed bump at 5 mph and note the ride quality. accumulators will have a smooth, well damped

Flat accumulators will a sharp and bouncy movement and ride.

Q: Why can’t I just or deactivate the AHC system?

A: The AHC system is with the Stability Control to reduce the body roll and Deactivating the system will the vehicle’s roll-over resistance. the oil pressure in the shocks supports a part of the vehicle weight and the height will drop to the height stops and ride harsh.

Q: I understand the Toyota Cruiser 100 standard suspension AHC) will ‘bolt on’ and can my AHC. Why shouldn’t I do that?

A: the AHC working as designed, the vehicle is compromised and occupants are at increased of … or injury if sudden are made. The LX-470 and LC-100 are similar, but the LX-470 has a higher of gravity due to the upgraded interior seats and other convenience and features.

Your insurance company most likely deny of any accident involving vehicle of control when they you have significantly modified vehicle suspension without them. They will to write any coverage at all when you do them.

Q: What damage may if I continue to drive with accumulators?

A: Driving with accumulators will cause high transient pressures in the absorbers when you go over This is, of course, very on all the suspension components, including the absorber mounting bushings.

The has a safety valve which this dangerously high back to the AHC oil reservoir. However, is not designed for continuous activation. the high pressure oil is released the shocks, the vehicle will lower than it was.

The AHC will then add oil back to the height, requiring the electric oil to run.

The AHC computer system has an automatic to prevent damaging the pump by or continuous running since would indicate a leak or damage. Driving on bumpy will cause the pump to activate and the AHC system to switch to mode. Now when you drive another bump, oil is released by the valve, but no oil is added back—and the level drops lower and on each bump.

It will a point that when the is in the air after hitting a bump, the pushing the wheel back will cause negative in the oil supply line from the This will … air the hydraulic pump past the shaft seal. The Lexus test procedure will this condition as a ‘faulty requiring replacement (at a cost of than $2500).

Lexus LX470

Q: Where are the located?

A: The accumulators are mounted the front and rear wheels on the of the frame rails, under the boards.

Q: How are the accumulators attached /

A: The accumulators simply screw on and off the valves mounted on the frame They can be removed easily either a ‘chain wrench’ or a open end wrench (spanner) is no more than 9mm (3/8”)

A: Someone has added water (or washer fluid) to my AHC oil reservoir. can I do?

A: Water and water based fluid will not permanently anything-but they will to be flushed out. A low cost to ACH fluid) Rust and Oxidation inhibited hydraulic oil purchased in 5 pail from an auto store is a good flushing Suction the fluid from the and refill it with clean

Then with the vehicle and height on ‘low’, open the bleeder’ on the right front AHC valve. Continue flushing the fluid is clean. Then to the left front, then rear, and finally right in succession.

If all the brake bleeders serious contamination, then it may be to remove each shock and the contaminated oil out of them, refill clean oil and reinstall the shocks. the vehicle a few days and repeat the flushing process to ensure all the has been removed.

Alcohol based (no-freeze) washer fluid will the pump because it is a very lubricant. It may also … the oil in the system and the accumulator diaphragms. must be flushed out as soon as

Brake fluid (glycol-ether DOT-3 or DOT-4) will the oil seals and accumulators and must be out as soon as possible. DOT-5 fluid is silicone oil and will not anything but needs to be flushed

I hope this FAQ has been to you. Please ask any questions you may in the comment section and I’ll be to help you out.

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