HYDROLASTIC SUSPENSION SYSTEM PDF

Hydrolastic Suspension Hydrolastic is a type of space-efficient automotive suspension system used in many cars produced by British Motor Corporation BMC and its successor companies. Description The system replaces the separate springs and dampers of a conventional suspension system with integrated, space efficient, fluid filled, displacer units, which are interconnected between the front and rear wheels on each side of the vehicle. Each displacer unit contains a rubber spring, and damping is achieved by the displaced fluid passing through rubber valves. The displaced fluid passes to the displacer of the paired wheel, thus providing a dynamic interaction between front and rear wheels.

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For this operation a special piece of equipment, namely a Hydrolastic Suspension Service unit, is required. Such units are generally available for hire, together with suitable suspension fluid, from most tool hire shops. In most cases, instructions for operating the unit are supplied with it and are normally printed on the top of the unit.

These instructions should be read through carefully before attempting to use the unit, and followed accurately throughout the operation. The unit consists basically of a vacuum pump, a pressure pump and a fluid reservoir. The Hydrolastic system pressure valves are located at the rear of the car on the sub-frame crossmember. Remember that the ride height of the car will drop as the Hydrolastic system is depressurised, so be careful when working at the rear of the car.

It should be noted that, with the Hydrolastic system in the depressurised state, the suspension arms will contact the bump rubbers at both front and rear, but the car can still be driven with complete safety at speeds up to 30 mph 50 kph over metalled roads. When any part of the Hydrolastic system has been disconnected, or after fitting new displacer units or interconnecting pipes, it is essential that the air is evacuated from the system and a partial vacuum created before the system is pressurised.

Once evacuated, the system should be pressurised with the car resting on all four wheels in an unladen condition and with a maximum of 4 galls The system should be left in this over-pressurised condition for about 30 minutes to allow the vehicle to settle, then the pressure reduced to its normal specified setting. The car must be resting on all four wheels with a load as described above for pressurising.

The pressure tank on the unit should be pumped up to the system specified working pressure before opening the connector valve, which will already have been connected to the system pressure valve. If a different pressure reading is now indicated, the system pressure should be adjusted by operating the pressure pump to raise the pressure, or opening the pressure valve on the unit to lower the pressure, until the specified figure is obtained.

Checking the Vehicle Ride Height The car ride height is governed by the Hydrolastic system pressure and should be checked with the car resting on level ground and a load condition as described above for pressurising the system. Measure the height from the axle centre-line to the underside of the wing opening at both the front and rear of the car and compare with the specified trim heights given in Technical Data at the end of this section.

If the dimensions are outside the specified limits, the system pressures should be checked and adjusted if necessary to obtain the correct ride height. The system pressures can be adjusted slightly from the specified figures to obtain the specified trim heights, but large variations will indicate wear or damage to the suspension components or body shell.

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Bottoming or lifting a wheel can cause serious control problems or directly cause damage. The control problems caused by lifting a wheel are less severe if the wheel lifts when the spring reaches its unloaded shape than they are if travel is limited by contact of suspension members See Triumph TR3B. Many off-road vehicles , such as desert racers, use straps called "limiting straps" to limit the suspensions downward travel to a point within safe limits for the linkages and shock absorbers. This is necessary, since these trucks are intended to travel over very rough terrain at high speeds, and even become airborne at times. Without something to limit the travel, the suspension bushings would take all the force when the suspension reaches "full droop", and it can even cause the coil springs to come out of their "buckets" if they are held in by compression forces only.

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Hydrolastic

Description [ edit ] The system replaces the separate springs and dampers of a conventional suspension system with integrated, space efficient, fluid filled displacer units which are interconnected between the front and rear wheels on each side of the vehicle. Each displacer unit contains a rubber spring, and damping is achieved by the displaced fluid passing through rubber valves. The displaced fluid passes to the displacer of the paired wheel, thus providing a dynamic interaction between front and rear wheels. When a front wheel encounters a bump fluid is transferred to the corresponding rear displacer then lowers the rear wheel, hence lifting the rear, minimising pitch associated with the bump. This effect is particularly good on small cars as their shorter wheelbases are more affected by pitching. Hence it is possible to design a compliant suspension - giving a comfortable ride - without suffering a penalty in terms of excessive roll when cornering. In roll, there is no transference of fluid from the displacers, and hence its internal pressure rises.

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For this operation a special piece of equipment, namely a Hydrolastic Suspension Service unit, is required. Such units are generally available for hire, together with suitable suspension fluid, from most tool hire shops. In most cases, instructions for operating the unit are supplied with it and are normally printed on the top of the unit. These instructions should be read through carefully before attempting to use the unit, and followed accurately throughout the operation. The unit consists basically of a vacuum pump, a pressure pump and a fluid reservoir.

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