VALVE 3C9646 - Caterpillar

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Rear view (114) Engine output speed sensor (115) Breather (83) Diagnostic connector (84) Customer interface connector (wire harness receptacle) (85) Drop box connector
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Bottom view (116) Flex plate bolt circle (M12 bolts) (117) Engine starter ring gear (118) Mounting flange for SAE No. 1 J617 flywheel housing for 12 bolt iron and 24 bolt aluminum housings (119) Control line pressure (120) Ecology drain (121) Magnetic plug (122) Transmission oil filter cover (5 x 11 filter)
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Work mode (straight through) (123) Transmission output speed sensor (124) Drop box breather (125) Work mode output speed sensor (126) Test port (work mode disengage pressure) (127) Test port (work mode engage pressure) (128) Work mode fork position sensor (129) Work mode engage solenoid (130) Work mode disengage solenoid
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2WD Drop box (131) Rear wheel drive engage solenoid (132) Rear wheel drive disengage solenoid (133) Test port (rear wheel drive disengage pressure) (134) Test port (rear wheel drive engage pressure) (135) Rear wheel drive disconnect speed sensor (136) Lube pressure (137) Rear wheel drive fork position sensor
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4WD Drop box (138) Test port (front wheel drive engage pressure) (139) Test port (front wheel drive disengage pressure) (140) Test port (filter outlet pressure and drop box lube pressure) (141) Drop box mounting pad (142) Drop box oil filter (143) Front wheel drive disconnect speed sensor
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4WD Drop box (144) Front wheel drive disengage solenoid (145) Front wheel drive engage solenoid (146) Front wheel drive fork position sensor (147) Magnetic plug (148) Ecology drain (149) Drop box magnetic screenDrop box
The drop box is used in order to provide propulsion to the driveline of the vehicle. The drop box will drive the winches for the draw works. The drop box changes the mode of operation by engaging or by disengaging the disconnects. When the transmission is in road mode, the lower driveline of the drop box is coupled to the engine and the transmission. In this mode, the upper driveline is disengaged. When the transmission is in the work-over mode, the upper driveline of the drop box is coupled to the engine and the transmission. In this mode, the lower driveline is disengaged. Only one driveline may be engaged at any time. The bottom disconnects are used in order to connect to the machine driveline. The bottom rear disconnect is connected to the rear wheels. The bottom front disconnect is optional. The bottom front disconnect is used in order to enable the front wheel drive.Note: The drop box is operated hydraulically so that when the top disconnect engage solenoid is energized the bottom disconnect disengage solenoid is energized and vice versa. This prevents a single short to the +battery fault from engaging a drive. Also, the dual transmission output speed sensors that are on the TH31 and TH35 have been moved. One transmission output speed is located on the gear group. The second sensor is located on the disconnect. The sensors send the required information to the Transmission ECU.The engagement of each disconnect is