Usage:
784B (5RK) Tractors;
771D (6JR),
775D (6KR) Quarry Trucks;
769D (5TR),
773D (7ER),
777D (3PR),
785B (6HK),
789B (7EK),
793B (1HL) Off-Highway Trucks
Reference: Service Magazine; December 11, 1995; Page 13; "New VIMS Download Cable is Now Available".
The 127-9797 Cable Assembly was designed to allow a personal computer to communicate with the VIMS system from ground level and replace the former 9X-3393 Cable Group which included 9X-3075 TPMS/VIMS Cable Assembly. When using the 127-9797 Cable Assembly and a personal computer to download Truck Payload Measurement System (TPMS) information, incomplete communications may occur due to a wire in the cable assembly which is needed only for VIMS systems. In machines equipped with VIMS, this wire completes the necessary circuitry to allow a machine's electronics to be powered up by the ground level key switch. On machines equipped with TPMS, this wire may cause an interruption to the communication download process, especially when using newer model personal computers with reduced voltage serial communications ports.
If incomplete communications occur while using 127-9797 Cable Assembly to communicate with TPMS, either discontinue the use of 127-9797 and use the former 9X-3075 Cable Assembly or MODIFY the 127-9797 Cable Assembly with the procedure listed below. The 127-9797 Cable Assembly is a direct replacement for the former 9X-3393 Cable Group, however the 9X-3075 Cable Assembly has been reinstated for use with TPMS and is available through normal distribution channels.
NOTE: On VIMS equipped machines using a MODIFIED 127-9797 or 9X-3075 Cable Assembly the ground level communications port will work only if the key switch in the cab is used to power up the machines electronics.
Procedure to Remove 127-9797 Cable Assembly Jumper Wire
1. On the 127-9797 Cable Assembly at the round five pin military specification style connector end, loosen the two screws holding the cable relief. The cable should be allowed to rotate freely during disassembly.
2. Locate the backing shell which is behind the lock ring. The backing shell is secured with a locking compound, some effort may be required to break the seal. Carefully remove the backing shell.
NOTE: Care should be taken not to bend any of the pins or break any wire connections while removing the backing shell. Repair pins or wires if necessary.
3. Remove jumper wire between connecting pins "A" and "E". The jumper wire is approximately 30 mm (1.2 in) in length.
NOTE: Be sure to remove all traces of the jumper wire to ensure no stray wire strands may short to adjacent pins.
4. Reassemble in reverse order.