RETAINER 2192438 - Caterpillar

Illustration 1 g03666238
(1) Left pedal position sensor
(2) Left pedal
(3) Mechanical linkage
(4) Right service brake pedal Left pedal position sensor (1) is located in the cab in the left brake pedal assembly. The position sensor (left brake pedal) sends an input to the transmission ECM. The sensor continuously generates a PWM signal. The duty cycle varies in proportion to the position of the left brake pedal position sensor. The left pedal position sends a change in the input signal to the transmission ECM. The ECM measures the duty cycle in order to determine the position of the pedal for downshifting the transmission and neutralizing the clutches.The transmission is in neutral when all FNR switches are in Neutral position.The transmission is locked into Neutral when :
Actual gear is Neutral
Ground speed is zero
Left armrest stowed (EH steering machines only)
Left armrest DOWN and steering is not aligned (EH steering machines only)Transmission is allowed to shift out of Neutral when:
All FNR switches are in neutral then one switch transitions to FORWARD or REVERSE
Left armrest down with operator not present or steering enabled (EH steering machines only)
Parking brake released only required when going into first gearTransmission Neutralizer Function
Illustration 2 g03662484
Left brake pedal positions
(A) Transmission Downshift
(B) Level Mode
(C) Moderate Mode
(D) Aggressive Mode
(E) Calibrated Initial Brake Pressure Point
(F) Brake Application
(1) Left Brake Position Sensor
(5) Stop Lamp Switch The 950M, and 962M machines are equipped with an Integrated Brake System (IBS). This system allows the operator to downshift the transmission and neutralize the transmission using the left brake pedal.The left pedal is attached to a PWM rotary position sensor and a mechanical linkage. The position sensor continuously monitors the left brake pedal position. The position sensor sends an input signal to the Power Train ECM indicating left brake pedal position. The mechanical linkage is connected to the brake control valve (not shown) located below the cab. The right service brake pedal is also connected to the brake control valve independent of the left brake pedal.Note: The amount of brake pedal travel can be displayed on the Cat ET screen. Pedal travel is displayed as a percentage (%) in Cat ET. Three percent of brake pedal travel is about 1°, and 100 percent of pedal travel is about 33°.Illustration 2 shows the actions that occur as the left brake pedal is depressed. The Integrated Brake System (IBS) works the same as the previous machines.The left brake pedal allows the operator to control the IBS and the transmission neutralizer of the machine. In approximately the first 9% of brake pedal travel (dead band), no braking or downshifting occurs.Brake pedal travel between the pedal dead band and the calibrated initial brake pressure point (E) will cause the transmission to downshift. When the left pedal is depressed further, and if the transmission is in third, fourth or fifth gear, the transmission will downshift one gear at a time until second gear is reached. IBS downshifts the transmission to use the engine and other parasitic loads to reduce the ground speed of the machine