BIT-CORE 2544817 - Caterpillar

953, 963, 973 LoadersSUPPLEMENT: 12/05/83SERVICE MAGAZINE, SEPTEMBER 26, 1983, PAGE 7.The article "Self-Locking Bolts Used In Actuator Valve Group" tells about the use of 6V9665 Bolts to hold the valve group to the bracket. Care must be used when these new bolts are installed into the valve group. As the bolts are tightened, it is possible for some of the nylon to be cut (sheared) off. If any of these pieces of nylon get between the valve group and bracket, they will not permit the seal to have the correct fit between the two parts. The result of this will be oil leakage past the seal. Remember to check for pieces of nylon between the valve group and the bracket as the bolts are tightened.--------------- END SUPPLEMENT ---------------Description of Change: Self-locking bolts are now used to hold the valve group to the bracket in the underspeed actuator valve groups in the hydrostatic transmissions on the above loaders. The self-locking bolts have deposits of nylon in the threads to keep the bolts tight.Adaptable As: The new 6V9665 Bolts are direct replacements for the former 2B2694 Bolts in this application. The new 6V9665 Bolts must be installed in place of the 2B2694 Bolts whenever the underspeed actuator valve group is disassembled. The new bolts are to be tightened to a torque of 25 5 N m (18 4 lb ft).