TM 5-3895-382-24 Hydraulic Oil Cat Hydraulic Oil (HYDO) - Hydraulic System Cat  Hydraulic  Oil  is  formulated  with  a  balanced  additive system,   including   detergents,   rust   inhibitors,   antiwear agents  and  defoamers.    It  will  offer  maximum  protection against  mechanical  wear,  rusting  and  corrosive  wear  in all hydraulic and hydrostatic transmission systems. Cat  Hydraulic  Oil  should  be  used  to  achieve  maximum life and performance from hydraulic system components and hydrostatic transmissions.  Use of Cat Hydraulic Oil is    recommended    in    most    hydraulic    and    hydrostatic systems. If    higher    viscosities    are    required    because    of    high ambient  temperatures,  the  following  Caterpillar  oils  can be used: Cat Diesel Engine Oil DEO (CF-4/CG-4) Cat Transmission/Drive Train Oil (TDTO) Commercial Oils If   Cat   oils   cannot   be   used,   the   following   commercial classifications can be used in the hydraulic system: API CF-4/SG MIL-L-2104E Premium  industrial  hydraulic  oils  that  have  passed  the Vickers    vane    pump    test    (35VQ25)    and/or    have    a minimum   of   0.09%   zinc   additive   may   also   be   used. These  oils  should  have  antiwear,  antifoam,  antirust  and antioxidation  additives  for  heavy  duty  use  as  stated  by the   oil   supplier.      ISO   viscosity   grade   of   46   would normally be selected. Caterpillar Transmission/Drive Train Oil (TDTO)(TO-4) Caterpillar   TDTO   TO-4   is   balanced   to   give   maximum frictional material life in power shift transmissions.  TO-4 oil     specifications     include     frictional     and     gear     wear requirements.    TO-4  oil  is  offered  in  several  viscosity grades,  including  SAE  50,  for  maximum  component  life at high ambient temperatures and heavy duty cycles. NOTICE TO-4   is   formulated   for   transmissions   and   drive trains only.  Using TO-4 in an engine would result in shortened engine life. Do not use engine oils for lubricating transmissions or drive trains. Failure to follow this recommendation  can  cause  shortened  transmission life  due  to  material  incompatibility  and  Inadequate frictional requirements for disk materials. Caterpillar  does  not  currently  offer  multi-grade  oils  for use  in  transmissions.    Multi-grade  oils  which  use  high molecular  weight  polymers  as  viscosity  index  improvers lose     their     viscosity     effectiveness     (permanent     and temporary  shear),  and  are  therefore  not  recommended for   transmission   and   drive   train   compartments.      The Caterpillar     TO-4     specification     includes     a     test     for multigrade    oil    shear    stability:    oils    that    meet    this specification may be available in the future. Transmission Lubricant Viscosity Recommendation The     following     table     lists     TDTO     viscosity     grades, quantities,   and   corresponding   par   numbers   available from your Caterpillar dealer. CATERPILLAR TRANSMISSION/DRIVE TRAIN OIL Caterpillar TDTO 19 L (5 US gal) 206 L (55 US gal) SAE 10W 8T-9568 8T-9569 SAE 30 8T-9572 8T-9573 SAE 50 8T-9576 8T-9577 Maintenance Section Lubricant Specifications 1-40