BUSHING A. 5M7629 - Caterpillar

Caterpillar: Confidential Yellow
SAFETY - INSTALL NEW 3T4197 PRESSURE SWITCH ASSEMBLY IN SERIES G MOTOR GRADERS WITH SUPPLEMENTAL STEERING PI1036 - DIS TRIBUTED TO U.S., CANADA, AMERICAS, CFEL AND COSA
  The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
INSTALL NEW 3T4197 PRESSURE SWITCH ASSEMBLY IN SERIES G MOTOR GRADERS WITH SUPPLEMENTAL STEERING, 4324, PI1036 U-79 A-42 C-63 E-52 O-49 safety parts stock action needed
Problem
The 3T4197 Switch Assembly is part of the supplemental steering attachment. If primary steering pressure is lost, the switch assembly senses the pressure drop and activates the supplemental steering pump. Some of the switches on affected product fail and will not detect the loss of primary steering pressure. Improved 3T4197 switches are used in current product. The improved switches also should be installed in affected product. AFFECTED MACHINES Model Identification Numbers 12G 61M10245, 10261, 10288, 10296, 10318, 10319, 10326, 10389, 10399, 10481, 10491, 10502, 10503, 10510, 10513, 10523, 10532, 10539, 10543, 10546, 10547, 10619, 10783, 10800 14G 96U4977, 5189, 6096, 6188, 6196, 6203, 6215, 6224, 6240, 6241, 6250, 6252-6254, 6257, 6263, 6264, 6266, 6273, 6274, 6288, 6290, 6303, 6312, 6318, 6322, 6325, 6335-6342, 6415, 6556, 6567, 6587, 6600, 6610, 6619, 6645, 6649, 6651 16G 93U1000, 1922, 1930, 1981 120G 87V6730, 6877, 6945, 6965, 7211, 7405, 7406, 7485 2048, 2061, 2065, 2075, 2096, 2097, 2111-2133, 2165, 2166, 2178 140G 72V6154, 6155, 6161-6164, 6185, 6200, 6263, 6264, 6302, 6306-6308, 6359, 6366, 6412, 6440, 6441, 6446, 6451-6455, 6457-6461, 6548, 6565, 6628-6630, 6672, 6702-6704, 6832, 6893-6895, 6902, 6913-6918, 6920-6922, 6924-6926, 6930, 6931, 7023, 7037, 7170, 7176, 7269, 7275, 7298, 7302-7304, 7310, 7314, 7360, 7380, 7394, 7438, 7455, 7456, 7477, 7499, 7513-7515, 7517, 7519, 7607, 7685, 7706, 7707, 7742, 7743, 7753, 7783, 7800, 7829, 7858, 7859, 7866, 7871, 7902, 7903
Parts Needed
1 - 3T4197 Switch Assembly
Action Required
Remove from parts stock any 3T4197 Switch Assembly having a date code (stamped on switch) of SERNO:G1000 or below, such as