TM 5-3895-383-24 Caterpillar Hydraulic Oil (HYDO) Caterpillar Hydraulic Oil is formulated with a balanced additive system. The system includes the following agents: detergents,  rust  inhibitors,  antiwear  agents,  and  defoamers. Caterpillar Hydraulic Oil offers the following benefits: protection against mechanical wear, protection against rusting, protection  against  corrosive  wear  in  hydraulic  systems,  and protection  against  wear  in  hydrostatic  transmission  systems. Caterpillar Hydraulic Oil should be used to achieve maximum life     and     maximum     performance     from     hydraulic     system components  and  from  hydrostatic  transmissions.    Caterpillar Hydraulic Oil is recommended in most hydraulic systems and in most hydrostatic systems. Caterpillar Hydraulic Oil If a different viscosity is required due to ambient temperatures, the following Caterpillar oils can be used: Caterpillar Multigrade Diesel Engine Oil (DEO) Caterpillar Single Grade Diesel Engine Oil (DEO) Caterpillar Transmission/Drive Train Oil (TDTO) Caterpillar Transmission Multi-Season Oil (TMS) Caterpillar Multipurpos e Tractor Oil (MTO) Commercial Oils If  Caterpillar  oils  cannot  be  used,  the  following  commercial classifications   can   be   used   in   hydraulic   systems   and   in hydrostatic transmission systems: CH-4 engine oils that have a minimum zinc additive of 0.09 percent (900 ppm) CG-4 engine oils that have a minimum zinc additive of 0.09 percent (900 ppm) CF-4  engine  oils  that  have  a  minimum  zinc  additive  of 0.09 percent (900 ppm) CF  engine  oils  that  have  a  minimum  zinc  additive  of 0.09 percent (900 ppm) Caterpillar Biodegradable Hydraulic Oil (HEES) Caterpillar  has  a  biodegradable  hydraulic  oil  that  is  available for    use    in    machine    hydraulic    systems.        This    fluid    is recommended  for  the  hydraulic  systems  when  environmental compliance is required or desired. Illustration 126 Machines    with    this    symbol    are    filled    with    biodegradable hydraulic oil.  This symbol is located on the hydraulic tank. This   fluid   is   formulated   with   the   following   components:      a saturated   HEES   (Hydraulic   Environmental   Ester   Synthetic) synthetic base stock, and selected additives.  Use this oil only in hydraulic systems. Caterpillar  Biodegradable  Hydraulic  Oil  (HEES)  may  become darker in color throughout the service life of the oil.  Analysis is required to determine the quality of the oil. The    maximum    recommended    water    content    for    hydraulic systems that are filled with Caterpillar Biodegradable Hydraulic Oil  (HEES)  is  0.10  percent.    If  the  water  levels  exceed  0.10 percent,  the  water  should  be  removed  or  the  oil  should  be replaced. Consult your Caterpillar dealer for additional information on this product and on the potential use. Commercial Biodegradable Hydraulic Oil (HEES) If Caterpillar Biodegradable Hydraulic Oil (HEES) is not used, commercial oils which meet the Caterpillar BF-1 specifications should be used. Maintenance Section Lubricant Specifications 1-45