PIN AS 2245084 - Caterpillar

(8YG),
990 (7HK),
936F (8AJ1-Up, 4TK1-Up, 9MK1-Up),
938F (1KM1-Up, 2RM1-Up, 8SM1-Up, 7SN1-Up),
950F (4DJ1-2074, 6YG1-Up, 7ZF1-Up),
950F Series II (5SK185-Up, 8TK185-Up, 4DJ2075-Up, 2LM1-Up),
960F (9ZJ1-Up, 4CL1-Up, 6XL1-Up, 1YM1-Up),
966F (8BG1-2047, 3XJ1-Up, 4YG1-Up),
966F Series II (1SL175-Up, 9YJ175-Up, 8BG2048-Up),
970F (7SK1-Up, 9JK1-Up, 7PL1-Up),
980F (8CJ1-Up, 5XJ1-587, 3HK1-Up),
980F Series II (8JN1-Up, 4RN1-Up, 5XJ588-Up) Wheel LoadersSUPPLEMENT: 05/08/95 Service Magazine; October 10, 1994; Page 10; "Ride Control Caution-High Axle Temperature".This article also applies to the following models. These models should be added to the list of adaptable models for the article.
936F (8AJ1-Up, 4TK1-Up, 9MK1-Up), 938F (1KM1-Up, 2RM1-Up, 8SM1-Up, 7SN1-Up), 950F (4DJ1-2074, 6YG1-Up, 7ZF1-Up), 950F Series II (5SK185-Up, 8TK185-Up, 4DJ2075-Up, 2LM1-Up), 960F (9ZJ1-Up, 4CL1- Up, 6XL1-Up, 1YM1-Up), 966F (8BG1-2047, 3XJ1-Up, 4YG1-Up), 966F Series II (1SL175-Up, 9YJ175-Up, 8BG2048-Up), 970F (7SK1-Up, 9JK1-Up, 7PL1-Up), 980F (8CJ1- Up, 5XJ1-587, 3HK1-Up), 980F Series II (8JN1-Up, 4RN1-Up, 5XJ588-Up) Wheel Loaders
Also, change the second paragraph of the article to read as follows:
When using the optional ride control system on the wheel loader models listed, and taking advantage of the increased travel speed, some special operating techniques should be observed. Do not rely entirely upon the brakes to slow the machine when approaching a truck, crusher of face. Relying solely upon the brakes to reduce machine speed can cause excessive heat build up in the axle, reducing brake and bearing life.
--------------- END SUPPLEMENT ---------------Reprint of January 1994 large wheel loader salesgram article concerning ride control precaution. Reprint includes additional cautions of excessive heat build up.
When using the optional ride control system, on the 988F and 990 wheel loaders, and taking advantage of the increased travel speed, some special operating techniques should be observed. Do not rely entirely upon the brakes to slow the machine when approaching a truck, crusher or face. Relying solely upon the brakes to reduce machine speed can cause excessive heat build up in the axle, reducing brake and bearing life.
Excessive heat build up can oxidize the axle oil resulting in blackened, burnt smelling oil with poor lubricating properties. In some cases failures of wheel bearings can occur in a few hundred hours. Brake energy and heat generation is four times greater at 35 km/h (22 mph) than at 21 km/h (13 mph).
As the machine approaches a truck, crusher or face, use the engine to reduce speed before applying the brakes. Reducing engine speed and down shifting will substantially reduce the heat load on the brakes. If engine braking is not used and the brakes are required to dissipate all the energy to slow the machine, brake and axle bearing life will be greatly reduced.
Decelerating with the engine will slightly increase cycle time over using brakes alone. However, the increase in production over a machine not equipped with ride control is still substantial.
The higher travel speeds made possible by ride control may also allow the machine to exceed the ton mile per hour rating of the tires. For more information concerning the ton mile per hour rating of the tires on your machine consult the local tire supplier.
The above applies specifically to repetitive load and carry cycles.