14 POWER STEERING process. Due to the various types of installation possibilities of our hydraulic steering systems (inverted, vertical, horizontal etc.) it can occur under certain circumstances that for a short period of time, the steering system cannot be bled in certain types of vehicle and the air in the steering gearbox is only removed very slowly. In such a case, we recommend that the steering drop arm should be removed so that the entire piston stroke from stop to stop can be utilized in the steering housing for the bleeding process. In this way the air remaining in the cylinder is reduced to a minimum.This is an insignificant amount which is automatically absorbed by the oil and separated during operation. The steering system and pump should be filled through the opening on the oil reservoir. For the first filling and for oil changes it is recommended to remove the cover of the container and fill with hydraulic oil up to the edge of the container. The engine should then be cranked briefly a number of times with the starter in order to fill the entire hydraulic systemwith oil. Since this causes the oil level in the container to fall rapidly, the oil must be continually topped up during this process and under all circumstances the pump must be prevented from taking in air. 3.2 Bleeding : The engine can be started with the steering axle jacked up when the steering system is filled with oil so that the oil level no longer falls below the upper marking on the oil dipstick when the engine is briefly turned over. Allow the engine to run for some time at low speed, thus allowing most of the air to escape from the cylinder. The oil level must be observed during this process. The oi l must be topped up immediately if the level still sinks. When the above instructions have been observed the oil level in the oil container must not rise higher than approximately 1 to 2 cm when the engine is switched off, according to the size of the steering system Steering gear MO33 is with automatic bleeding and do not have a bleeding screw. The steering system automatically bleeds the remaining air in III. Oil filling and air bleeding Note : There is a danger that dirt particles may enter the steering oil circuit when filling the steering unit with hydraulic oil. A high degree of cleanliness must be observed for the first filling and for all subsequent topping up operations in order to prevent failure due to foreign bodies in the system. For this reason, thoroughly clean the oil reservoir and the area around it before removing the oil reservoir cover or dip- stick so that dirt does not get into the hydraulic oil. 1. Type of oil : A suitable hydraulic oil must be used in order to ensure perfect function of the steering unit and the pump. The hydraulic oil also carries out the lubrication of the steering gearbox and the pump; therefore only one type of oil is necessary for the entire unit. The unit should be filled with ATF oils with a viscosity of approximately 26 mm2/s (cst) at 500 C, a setting point below-350 C and with low inclination to foam formation. Oils with a high viscosity may lead to the situation that the under pressure in the inlet line becomes too great thus causing noises in the pump. (Approx. 2 ltrs.) 2. Oil quantity : The hydraulic steering system is delivered from the factory without being filled with oil. The oil required for the complete system depends on the length of pipes used in the system. Type M033 0.3 Lts 3. Oil filling and air bleeding 3.1 Oil filling Note : Special care must be taken during the procedure described as follows to ensure that the oil reservoir is not allowed to run empty since this would cause air bubbles in the steering system. In addition to this, special care must also be taken during oil filling and air bleeding to ensure that the pump only turns at the lowest possible speed (idling). If the inlet flow is too great small air bubbles would enter the pump and be split up into extremely small air bubbles during its passage through the pump; this situation may lead to foam formation thus greatly extending the bleeding
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