93. Certain other types of petroleum oils are suitable forMobile hydraulic service if they meet the following provisions:a. Contain the type and content of antiwearcompounding fould in MS crankcase oils or have passedpump tests similar to those used in developing the antiweartype hydraulic oils.b. Meet the viscosity recommendations shown inTable 3.c. Have sufficient chemical stability for Mobilehydraulic system service.The following types of oil are suitable if they meet the abovethree provisions:– Series 3 Diesel Engine Oil– Automatic Transmission Fluid Types A, F andDEXRON– Hydraulic Transmission Fluid Types C-1 and C-2Table 3 summarizes oil types recommended for use withVickers equipment in Mobile hydraulic systems by viscosityand service classification.Hydraulic SystemOperatingTemperatureRange(Min.* to Max.)SAEViscosityDesignationAmericanPetroleumInstitute (API)ServiceClassification0°F to 180°F0°F to 210°F50°F to 210°F10W10W-30**20-20WMSMSMS* Ambient start-up temperature** See paragraph on Viscosity IndexTable 3. Oil RecommendationsThe temperatures shown in Table 3 are cold start-up tomaximum operating. Suitable start-up procedures must befollowed to insure adequate lubrication during systemwarm-up.Arctic conditions represent a specialized field whereextensive use is made of heating equipment before starting.If necessary, this, and judicious use of SAE 5W or SAE5W-20 oil in line with the viscosity guide lines shown in thetable, may be used. Dilution of SAE 10W (SM) oil withmaximum of 20% by volume of kerosene or low temperaturediesel fuel is permissible. During cold start-up, avoid highspeed operation of hydraulic system components until thesystem is warmed up to provide adequate lubrication.Operating temperature should be closely monitored to avoidexceeding a temperature of 130°F with any of these lightweight or diluted oils.Where special consideratins indicate a need to depart fromthe recommended oils or operating conditions, see yourVickers sales representative.CleanlinessThorough precautions should always be observed to insurethe hydraulic system is clean:1. Clean (flush) entire new system to remove paint, metalchips, welding shot, etc.2. Filter each change of oil to prevent introduction ofcontaminants into the system.3. Provide continuous oil filtration to remove sludge andproducts of wear and corrosion generated during the life ofthe system.4. Provide continuous protection of system from entry ofairborne contamination.5. During usage, proper oil filling and servicing of filters,breathers, reservoirs, etc., cannot be over emphasized.F. Overload ProtectionA relief valve must be installed in the system, unless it is anintegral part of the pump. The relief valve limits pressure inthe system to a prescribed maximum and protects thecomponent from excessive pressure. The setting of the reliefvalve depends on the work requirements of the system andthe maximum pressure ratings of the system components.G. Port PositionsThe pump cover can be assembled in four positions withrespect to the body. A letter in the model code (Table 2)identifies the cover position as shown in Figure 6.Disassembly and assembly procedures are in Section VI, Band D.H. Start-UpWith a minimum drive speed of 600 RPM, a pump shouldprime almost immediately, if provision is made to initiallypurge the air from the system. Failure to prime within areasonable length of time may result in damage due to lackof lubrication. Inlet lines must be tight and free from air leaks.However, it may be necessary to crack a fitting on the outletside of the pump to purge entrapped air.Figure 6.OppositeInlet90° Clockwisefrom InletAD CIn LineWith InletInlet PositionPump Body180°90°90°B