2009/08/10 An Improved Adjustment Procedure for the Stop Lamp Switch is Now Available {1435, 4269} Caterpillar

An Improved Adjustment Procedure for the Stop Lamp Switch is Now Available {1435, 4269}

2009/08/10 [SEPD1004]

2009/08/10 Diagnostic Publications for the Systems of the Hydraulic Electronic Unit Injector (HEUI) have been Updated {1100, 1126, 1250, 1251, 1261, 1290}

BRAKING SYSTEM

CONTROL GP

2009/08/10 An Improved Adjustment Procedure for the Stop Lamp Switch is Now Available {1435, 4269}

Wheel Dozer:
814F (S/N: 9DM1-UP)
814FSeries 2 (S/N: BXG1-UP)
814F (S/N: BGF1-UP)
824GSeries II (S/N: AWW1-UP)
824G (S/N: 4SN1-UP)
824H (S/N: ASX1-UP)
834G (S/N: BPC1-UP; 6GZ1-UP)
834H (S/N: BTX1-UP)
844H (S/N: BTW1-UP)
854K (S/N: 2211-UP)
Landfill Compactor:
816F (S/N: 5FN1-UP; BMR1-UP)
826GSeries II (S/N: AYH1-UP)
826G (S/N: 7LN1-UP)
826H (S/N: AWF1-UP)
836G (S/N: BRL1-UP; 7MZ1-UP)
836H (S/N: BXD1-UP)
Soil Compactor:
815F (S/N: BKL1-UP; 1GN1-UP)
825GSeries II (S/N: AXB1-UP)
825G (S/N: 6RN1-UP)
825H (S/N: AZW1-UP)
Wheel Loader:
988G (S/N: BNH1-UP; 2TW1-UP)
988H (S/N: BXY1-UP)
990Series II (S/N: BCR1-UP; 4FR1-UP)
990 (S/N: 7HK1-UP)
990H (S/N: BWX1-UP)
991K (S/N: 5301-UP)
992G (S/N: ADZ1-UP)
994F (S/N: 4421-UP)

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Table 1
Reference Information
Sales Model	Serial Number Prefix	Media Number
824G	4SN	Testing and Adjusting, SENR1334
824G II	AWW	Testing and Adjusting, RENR6035
824H	ASX	Testing and Adjusting, RENR8696
825G	6RN	Testing and Adjusting, SENR1334
825GII	AXB	Testing and Adjusting, RENR6035
825H	AZW	Testing and Adjusting, RENR8696
826G	7LN	Testing and Adjusting, SENR1334
826GII	AYH	Testing and Adjusting, RENR6035
826H	AWF	Testing and Adjusting, RENR8696
834G	6GZ	Testing and Adjusting, RENR2189
834G	BPC	Testing and Adjusting, RENR2189
834H	BTX	Testing and Adjusting, RENR6365
836G	7MZ	Testing and Adjusting, RENR2189
836G	BRL	Testing and Adjusting, RENR2189
836H	BXD	Testing and Adjusting, RENR6365
844H	BTW	Testing and Adjusting, RENR8820
854K	221	Testing and Adjusting, RENR8949
988G	BNH	Testing and Adjusting, RENR2199
988H	BXY	Testing and Adjusting, RENR6215
990II	BCR	Testing and Adjusting, RENR8820
990H	BWX	Testing and Adjusting, RENR8820
992K	H4C	Testing and Adjusting, RENR8949
993K	Z9K	Testing and Adjusting, KENR5825
994F	442	Testing and Adjusting, RENR6326

An Improved adjustment procedure for the stop lamp switch is now available. Refer to the following information for the procedure.

Adjust the Limit Switch (Stop Lamp)

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Personal injury or death can result if two persons are not used in the following procedure.

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Illustration 1	g01737117
(1) Plug (2) Adjustment screw

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Illustration 2	g01737118
Side view of the right service brake pedal (3) Pedal stop (4) Treadle heel stop

Move the machine to a hard, level surface. The surface must also be dry and free of debris. Engage the parking brake. Turn the ignition switch to the OFF position.

Ensure that there is no interference with other components when both of the brake pedals are applied and released. When both brake pedals are in the released position, the stop lights for the machine should be in the OFF position.

Insert a 3.5 mm (0.14 inch) shim between Treadle heel stop (4) and pedal stop (3) of both the left brake pedal and the right brake pedal. Monitor the stop lights. When the shims are in place, the stop lights should be in the ON position. Remove the shims.

Insert a 1.5 mm (0.06 inch) shim between Treadle heel stop (4) and pedal stop (3) of both the left brake pedal and the right brake pedal. Monitor the stop light. When the shims are in place, the stop lights should be in the OFF position. Remove the shims.

Ensure that the stop lights go ON and OFF when the brake pedals are applied and released. If the stop lights work properly no adjustments are necessary at this time.

If steps 3, 4, and 5 are not satisfied perform the following procedure.

Insert a 3.5 mm (0.14 inch) shim between Treadle heel stop (4) and pedal stop (3) of both the left brake pedal and the right brake pedal.

Remove plug (1) and turn the adjustment screw for switch (2) counterclockwise in order to turn the stop lights OFF. Then, turn the adjustment screw for the switch clockwise until the stop lights turn ON. When the shims are in place, the stop lights should be in the ON position. Remove the shims. The stop light should go to the OFF position.

Insert the 1.5 mm (0.06 inch) shim between Treadle heel stop (4) and pedal stop (3) of both the left brake pedal and the right brake pedal. Monitor the stop lights. When the shims are in place, the stop lights should be in the OFF position. Remove the shims.

Ensure that the stop lights go ON and OFF when both of the brake pedals are applied and released. Repeat steps 7, 8, and 9 if the stop lights do not work properly.
Note: If the stop lights will not operate properly after the adjustment procedure, remove the cover for the enclosure. The limit switch may need to be replaced.