THE DRIVE SHAFT YOKES ON THE REAR AXLES MAY FAIL ON CERTAIN 950F WHEEL LOADERS - COSA LETTER NO. 4 - PI3560 - MAILED COSA
NOTE:   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 AVSpare product analyst.
JULY 31, 1991 COSA LETTER NO. 4 THE DRIVE SHAFT YOKES ON THE REAR AXLES MAY FAIL ON CERTAIN 950F WHEEL LOADERS 3253 PI3560 COMPLETION DATE
January 31, 1992 January 31, 1992
The 9C4090 Yoke may fail on certain 950F Wheel Loaders due to possible incorrect heat treat of the splines.
Model Identification Number 950F 6YG 1 to 885 (exception 6YG483, 828, 846, 847, 858, 862, 865, 867, 868, 870, 873, 874, 877, 878, 880, 882, 883 and 884 already reworked in plant). 6LJ 1 to 40 5PJ 1 to 12
The following parts will be needed: 2 - 6C7406 Yokes. New part with increased spline length. NOTE : Machines that have been repaired with 9C4090 Yokes shipped from Grimbergen or Leicester after June 21, 1991 do not have to be replaced again. HEBE1392 - 2 -
Remove the front and rear axle yokes as per Service Manual. Inspect yoke splines for wear and according to condition rework as follows: Rework I If splines are completely stripped then the axle will need to be removed, disassembled and cleaned for metal contamination. Inspect the pinion splines for damage and replace if necessary. Labor allowance 16 hours per axle includes yoke replacement on both axles. Rework II If splines are worn but still engage the pinion splines, then only the respective axle oil will need changing. Labor allowance 3 hours to replace both front and rear yokes, topping and or changing axle oil as necessary. This labor allowance also applies to straight yoke replacement on no failure and stock machines. Rework III If an earlier rear yoke failure was repaired with a 9C4090 Yoke shipped from Grimbergen or Leicester after June 21, 1991, then only the front yoke will need replacing. Suggest that the rear 9C4090 Yoke is switched to the front axle and that the new 6C7406 Yoke is mounted on the rear axle. Labor allowance 3 hours. NOTE : The new yoke is not fitted with a guard. Remove the 7V3791 Guards from the old yokes and install on the new yokes. Any additional parts should be claimed separately in accordance with the warranty procedures. SERVICE CLAIMS ALLOWANCES AVSpare Dlr Suggested Customer Suggested --------------- ---------------- ------------------ Parts Lab. Hrs. Parts Lab. Hrs. Parts Lab. Hrs. (D/N) (Sell) (C/L) (Sell) Rework I 100% 16 0 0 0 0 Rework II 100% 3 0 0 0 0 Rework III 100% 3 0 0 0 0
Retain parts until claim settlement has been made. - 3 - PARTS STOCK Remove any 9C4090 Yokes in the parts department that were shipped from Grimbergen or Leicester before June 21, 1991. Submit a separate claim making reference to this Service Letter. Yokes from other sources are not affected. MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.