TM 5-3895-383-24 · Multipurpose Tractor Oil (MTO) Caterpillar Multipurpose Tractor Oil is available for use in the following   systems   for   the   Challenger   tractor:      implement steering, hydraulic systems, and steering control mechanisms. Multipurpose  Tractor  Oil  is  also  recommended  for  use  in  the rear drive axles of the Caterpillar Backhoe Loader.  This oil has an   ambient   temperature   range   of   -25C   (-13F)   to   40C (104F) for these applications. For ambient conditions that are below -25C (13F), check with your  supplier.    The  Multipurpose  Tractor  Transmission  Fluids that   are   commercially   available,   must   meet   the   required ambient  temperature  capability  for  your  area  and  must  meet the Ford/New Holland specification of "M2C134-D". NOTICE Caterpillar Multipurpose Tractor Oil (MTO) is not the same as  Caterpillar  Transmission/Drive  Train  Oil,  and  does  not meet  Caterpillar's  specifications  for  TO-4  oil.    Caterpillar MTO  should  not  be  used  in  compartments  which  specify TO-4 oil. S· O·S Oil Analysis SMCS Code:  1348; 3080; 4070; 4250; 4300; 5050; 7542 Caterpillar  recommends  the  use  of  the  SOS   oil   analysis program  in  order  to  monitor  the  condition  of  your  equipment. The   S OS    oil    analysis    program    will    complement    your preventive maintenance program. Obtaining S· O· S Oil Samples Before you obtain an SOS Oil sample, operate the machine until the oil is warm and the oil is well circulated.  Then obtain the SOS Oil sample. In order to obtain a good oil sample, do not take the oil sample from the drain stream.  The drain stream method can allow a stream  of  dirty  oil  from  the  bottom  of  the  compartment  to contaminate  the  sample.    Likewise,  never  dip  an  oil  sample from an oil container or pour a sample from a used filter. NOTICE Do    not    use    the    same    vacuum    sampling    pump    for extracting oil samples that is used for extracting coolant samples. A  small  residue  of  either  type  sample  may  remain  in  the pump  and  may  cause  a  false  positive  analysis  for  the sample being taken. Always  use  a  designated  pump  for  oil  sampling  and  a designated pump for coolant sampling. Failure  to  do  so  may  cause  a  false  analysis  which  could lead to customer and dealer concerns. There   are   two   ways   to   obtain   SOS   Oil   samples.      The following methods are listed in the order that is preferred: Use   an   in-line   sampling   valve   for    pressurized    oil systems. Use a sampling gun that is inserted into the sump. Use of the in-line sampling valve is the preferred method.  This method     provides     samples     that     are     less     likely     to     be contaminated.  Whenever you obtain the samples, obtain the samples from the same point.  This makes the samples more representative of the oil that is in the system. In order to obtain an oil sample from the engine compartment, it may be necessary to increase the engine's speed.  Normally, the oil sample is taken at low idle.  If the flow rate is too low, increase  engine  speed  to  high  idle  in  order  to  obtain  the  oil sample. In-line sampling valves cannot be used on nonpressurized oil systems  such  as  differentials  and  final  drives.    Use  of  the sampling  gun  is  the  preferred  method  for  nonpressurized  oil systems. Refer to the Operation and Maintenance Manual, "Maintenance Interval Schedule" for the proper interval. The SOS oil analysis is composed of four basic tests: Wear metal analysis Infrared analysis  for oil condition Tests  for  contamination  of  the  oil  by  fuel,  by  water, and/or by antifreeze Particle  Count  for  hydraulics,  transmissions  and  other gear compartments Consult  your  Caterpillar  Dealer  for  complete  information  and assistance about the SOS oil analysis program. Maintenance Section Lubricant Specifications 1-51