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Text version of the page
| BUCHER HYDRAULICS | ||||||||||||||||||||||||||||||||||||||||||
| 2.2 Recommended fluids/Allowed temperatures We recommend using only mineral oil-based hydraulic fluids that comply with the ISO/DIN standards. Viscosity range: recommended 20 + 120 mm2/s (cSt) permitted up to 700 mm2/s (cSt) Operating temperature Temperature | ||||||||||||||||||||||||||||||||||||||||||
| * Caution! - Use of motors at temperatures above 80 C must always be agreed upon with our Technical Office, and in any case this can cause a significant worsening in the volumetric efficiency. For use under conditions different from those indicated in this catalogue, please contact our Sales Department. | ||||||||||||||||||||||||||||||||||||||||||
| Type of seals | ||||||||||||||||||||||||||||||||||||||||||
| APM100 | ||||||||||||||||||||||||||||||||||||||||||
| APM05 -15 65° C -10 80° C | ||||||||||||||||||||||||||||||||||||||||||
| APM200-APMR200 -15 80° C -10 120° C | ||||||||||||||||||||||||||||||||||||||||||
| Buna N Viton* | ||||||||||||||||||||||||||||||||||||||||||
| Outlet | ||||||||||||||||||||||||||||||||||||||||||
| 2.3 | ||||||||||||||||||||||||||||||||||||||||||
| 2.3.1 Unidirectional motors As a matter of principle, unidirectional motors correspond to counter rotating pumps. The balancing seals are not symmetric and, consequently, two different pressure sides: inlet High-pressure and outlet Low-pressure side, which must not be exchanged each other, are defined. The outlet Low-pressure side loads the back side of the oil retaining shaft seal, a dedicated steel ring for supporting it, is adopted. The maximum outlet Low-pressure value is limited by the shaft seal and its support and it must be M1 s 3.5 bar (50 PSI), although the real value is related to the shaft speed: for detailed information, please, contact our Sales Dept. To keep P out below the suggested value, the following must be avoided: - long distance between motor and tank - long stretches of piping - special features such as: bends; reductions in diameter; quick couplings; etc. Having filtration on the return it is also advisable to choose a filter of a suitable size to minimise any pressure drop and to take measures to prevent gradual clogging over time. | 2.3.2 Reversible motors Reversible rotating motors have symmetric balancing seals and both port, inlet and outlet, can be, alternatively, operate as inlet High-pressure and outlet Low-pressure port. A sealed area is connected to the back side of the oil retaining shaft seal and its pressure must be limited connecting it to the tank, through a drain threaded port, which is generally, placed on the motor rear cover. The drain hose must be chosen in order to avoid that the pressure at the drain port does not exceed 3,5 bar. Motors with internal drain connection, are available, but adopting this solution the outlet Low-pressure side must be <3,5 bar. | |||||||||||||||||||||||||||||||||||||||||
| 2.4 Filtration A short service life of a gear motor is normally due to the presence of impurities in the oil. It is therefore essential to have an effective filter in the system and to carry out regular maintenance to ensure a long, trouble-free service life. When possible and compatible with the hydraulic circuit installed, Bucher Hydraulics S.p.A. recommends that the system have total filtration (high and low pressure, return). In any case, the filtering system must constantly ensure an oil contamination class equal to or less than those shown in the following table. | ||||||||||||||||||||||||||||||||||||||||||
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| We also recommend that an adequate air filter be installed on the tank to prevent contaminating substances such as dust, sand, etc. from getting into the oil, as these substances can enter the tank through the air flow caused by the level variations in the tank itself. | ||||||||||||||||||||||||||||||||||||||||||
| 200-P-991225-E-01/05.08 | ||||||||||||||||||||||||||||||||||||||||||
| 5/64 | ||||||||||||||||||||||||||||||||||||||||||