2009/06/15 Caterpillar

Wheel Loader:

993K (S/N: LWA1-UP; Z9K1-UP)

ReferenceDisassembly and Assembly, KENR5817, "993K Wheel Loader Power Train"

Description of Change: New hardware and software have been developed in order to improve the life of the impeller clutch on the torque converter for 993K Wheel Loaders. The new hardware and software will prevent premature clutch failure due to high loads and temperatures.

Adaptable To:

Table 1

Required Parts (1)
Original Part Number	Item	New Part Number	Item	Required Before Failure	Required After Failure
155-6189	Housing As	326-1354	Housing As	X	X
123-5255	Clutch Piston	326-1356	Piston	X	X
7S-6892	Seal Ring	7S-6892	Seal Ring	X	X
122-9978	Seal Ring	1S-6478	Seal Ring	X	X
6I-8597	Friction Disc	324-9127	Friction Disc	X	X
6Y-7198	Plate	6Y-7198	Plate	X	X
254-1474	Power Train Software Gp	333-9625	Power Train Software Gp	X	X
132-8876	Oil Filter Element As	132-8876	Oil Filter Element As		X
104-1817	Oil Cooler Core As	104-1817 (1)	Oil Cooler Core As		X

( 1 )

A remanufactured oil cooler assembly is available. Part number 10R-8649

Refer to table 1 for the list of required parts that are needed before clutch failure has occurred or after clutch failure has occurred. When the hardware is changed, the software file needs to be installed. The software will work with either the new friction material or the old friction material. The new friction material requires the latest software files.

The new hardware and software are adaptable to the following machines:

• 993K (S/N: LWA1-429; Z9K1-322)

The new hardware and software are effective in production on the following machines:

• 993K (S/N: LWA430-UP; Z9K323-UP)