Transmission Neutralizer Override Control{1435, 7451} Caterpillar

Transmission Neutralizer Override Control{1435, 7451}

Usage:

Load Haul Dump:: R1300 (S/N: 6QW1-UP); R1300G Series II (S/N: RSL1-UP); R1300G (S/N: LJB1-UP); R1300G (S/N: NJB1-UP)

Introduction

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Illustration 1	g01051135

The supplemental product support literature should be used with the appropriate Service Manual and the appropriate Parts Manual that is available for each standard machine. This supplement is used to determine the difference between the custom modifications and a standard machine.

The Service Manual and the Parts Manual available for the standard machine should be used if service information is not in this supplementary product support literature.

Operation

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Illustration 2	g01467871
R1300 S/N:6QW1-UP (1) Transmission neutralizer override switch

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Illustration 3	g01467872
R1300G S/N:LJB1-UP, R1300G II S/N:RSL1-UP and R1300G S/N:NJB1-UP (1) Transmission neutralizer override switch

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Transmission Neutralizer Override Switch (1) - The transmission neutralizer override switch is a two-position switch.

Move the switch to the upper position to deactivate the transmission neutralizer. The service brake and transmission neutralizer pedal will now operate as a conventional service brake pedal.

Move the switch to the lower position to activate the transmission neutralizer. When the service brake and transmission neutralizer pedal is depressed, the service brake will apply, and the transmission will be disengaged, allowing the operator to increase engine speed for improved hydraulic performance.

Transmission Neutralizer Function

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Illustration 4	g01467907
R1300 S/N:6QW1-UP (1) Service brake and transmission neutralizer pedal

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Illustration 5	g01521094
R1300 S/N:6QW1-UP (2) Transmission neutralizer limit switch

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Illustration 6	g01467928
R1300G S/N:LJB1-UP, R1300G II S/N:RSL1-UP and R1300G S/N:NJB1-UP (1) Service brake and transmission neutralizer pedal (2) Transmission neutralizer limit switch

The transmission neutralizer limit switch (2) is located in the operator station and is activated by depressing service brake and transmission neutralizer pedal (1) .

When the service brake and transmission neutralizer pedal is depressed, the normally closed contacts of transmission neutralizer limit switch open. The open contacts interrupt the power from the Power Train ECM. causing the Power Train ECM to neutralize the transmission. The engine rpm will increase when the transmission is neutralized due to the no-load condition from the transmission, allowing full hydraulic power for worktool operation.

Note: On R1300G and R1300G II machines, when transmission is neutralized, the gear indicator shows the speed that is selected and the direction will show neutral.

Note: On R1300 S/N:6QW machines, the gear readout on the monitor does not change when the transmission is neutralized. The monitor continues to show the speed and direction that will be engaged when the pedal is released.

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Illustration 7	g01467948
R1300 S/N:6QW1-UP (3) Transmission neutralizer override switch

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Illustration 8	g01467950
R1300G S/N:LJB1-UP, R1300G II S/N:RSL1-UP and R1300G S/N:NJB1-UP (3) Transmission neutralizer override switch

The transmission neutralizer override switch (3) is an input to the Power Train ECM. The input is used by the Power Train ECM to determine if the transmission neutralizer should be enabled or disabled.

When the machine is started, the transmission neutralizer is enabled.

Move the switch to the upper position to deactivate the transmission neutralizer. The service brake and transmission neutralizer pedal will now operate as a conventional service brake pedal.

Move the switch to the lower position to activate the transmission neutralizer. When the service brake and transmission neutralizer pedal is depressed, the service brake will apply and the transmission will be disengaged, allowing the operator to increase engine speed for improved hydraulic performance.

Switches (R1300 S/N:6QW1-UP, R1300G ; S/N:LJB1-UP and R1300G ; S/N:NJB1-UP)

Transmission Neutralizer Limit Switch

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Illustration 9	g00287699
Transmission neutralizer limit switch

The transmission neutralizer limit switch is an input of the Power Train Electronic Control Module (ECM). The transmission neutralizer limit switch is a two-position limit switch. The transmission neutralizer limit switch informs the Power Train ECM when the service brake and transmission neutralizer pedal is depressed.

When the transmission neutralizer limit switch is activated (brake pedal pressed), the switch is open. When the switch is open (not grounded), the Power Train ECM neutralizes the transmission. When the transmission neutralizer limit switch is deactivated (brake pedal released), the switch closes contact J2-4 of the Power Train ECM to ground. The COM terminal is connected to frame ground. The N/C terminal of the switch is not used.

Transmission Neutralizer Override Switch

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Illustration 10	g01470134
Transmission neutralizer override switch R1300 S/N:6QW1-UP

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Illustration 11	g01521073
Transmission neutralizer override switch R1300G S/N:LJB1-UP and R1300G ; S/N:NJB1-UP

The transmission neutralizer override switch is an input to the Power Train Electronic Control Module (ECM). The transmission neutralizer override switch has two positions. The ON position and the OFF position.

The transmission neutralizer override switch signals the Power Train ECM to enable/disable the neutralizing function of the left brake pedal.

When the transmission neutralizer override switch is in the ON position, contact J2-4 of the Power Train ECM is always grounded, overriding the operation of the transmission neutralizer override switch on the left brake pedal and stops the transmission neutralizer function. When the transmission neutralizer override switch is in the OFF position, the transmission neutralizer limit switch on the left brake pedal operates as normal.

Switches (R1300G II S/N:RSL1-UP)

Transmission Neutralizer Limit Switch

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Illustration 12	g00287699
Transmission neutralizer limit switch

When the transmission neutralizer limit switch is activated (brake pedal pressed), the switch is open. When the switch is open (not grounded), the Power Train ECM neutralizes the transmission. When the transmission neutralizer limit switch is deactivated (brake pedal released), the switch closes contact J2-31 of the Power Train ECM to ground. The COM terminal is connected to frame ground. The N/C terminal of the switch is not used.

Transmission Neutralizer Override Switch

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Illustration 13	g01521073
Transmission neutralizer override switch R1300G II S/N:RSL1-UP

The transmission neutralizer override switch signals the Power Train ECM to enable/disable the neutralizing function of the left brake pedal.

When the transmission neutralizer override switch is in the ON position, contact J2-31 of the Power Train ECM is always grounded, overriding the operation of the transmission neutralizer override switch on the left brake pedal and stops the transmission neutralizer function. When the transmission neutralizer override switch is in the OFF position, the transmission neutralizer limit switch on the left brake pedal operates as normal.