621H Wheel Tractor-Scraper Caterpillar

Marker Light - Press button (1) to illuminate the marker lights. Indicator light (C) will also illuminate.

Headlight - Press button (1) again to illuminate the headlights. Indicator light (B) will also illuminate. The marker lights will still be illuminated and indicator light (C) will still be illuminated. In order to turn the headlights and position lights OFF press the button again.

Front Worklight - Press button (2) to illuminate the front worklights. Indicator light (B) will also illuminate. Press the button again to turn off the front worklights.

Window Washer - Press and hold the button (3) in order to activate the window washer. While the button is depressed, indicator light (B) will illuminate and washer fluid will spray from the nozzle. The window wiper will also operate while the button is depressed. After the button is released, the window wiper will stop.

Keypad Help - Push the button in order to enable the help assistance feature. Indicator lights (B) or (E) will flash. The help assistance feature will be active for 10 seconds. Push any flashing button in order to receive help information on the display panel. Push the help button again in order to cancel the help assistance feature.

Access Step (Up) - Press and hold button (5) in order to move the step up. Indicator light (B) will illuminate. Pressing button (5) will activate button (26) and will illuminate the access step light.

Warning Hazard Light button - Push the button in order to activate the hazard lights. Indicator light (B) will illuminate. Push the button again to turn off the hazard lights.

Rear Worklight - Press button (7) to illuminate the rear worklights. Indicator light (B) will illuminate. Press the button again to turn off the rear worklights.

Window Wiper - Push the button in order to activate the window wiper in the LOW speed. Indicator light (C) will illuminate. Press button (8) again and indicator light (C) and (B) will illuminate. The window wiper will be in the HIGH speed. Press the button again to turn off the window wiper.

Throttle Lock Control button - The button maintains the engine rpm at a desired speed. Engage the button in order to keep the engine at the current rpm. When the throttle lock is active, an indicator light will illuminate on the front dash. Refer to the “Indicators” topic in Operation and Maintenance Manual, "Monitoring System" for more information about the indicator light. Use the throttle lock control on long hauls in order to avoid driver fatigue. Fatigue may result from depressing the manual throttle control for an extended time.

Access Step (Down) - Press and hold button (10) in order to move the step down. Indicator light (B) will illuminate. Pressing button (10) will activate button (26) and will illuminate the access step light.

Retarding Level - Press button (11) to activate retarding. Indicator lights (A), (B), and (C) will illuminate. This indicates that the retarding level is set to HIGH. Press the button again indicator lights (B) and (C) will be illuminated. This indicates that the retarding level is set to MEDIUM. Press the button again and only indicator light (C) will be illuminated. This indicates that the retarding level is set to LOW. Press the button again and the retarding function will be disabled. After a retarding level has been selected, the engine retarder will engage at any time either of the throttle controls are not depressed and the tractor is in third gear FORWARD or higher.

Force Regeneration - Push in the top of the switch for 2 seconds in order to begin regeneration. An indicator light on the switch will become active showing that the regeneration is active. An indicator light on the dash will become active showing that the regeneration is active. The indicator lights will deactivate after regeneration is completed.

Disable Regeneration - Push in the bottom of the switch for 2 seconds in order to disable regeneration. An indicator light on the switch will become active showing that the regeneration is being disabled. The indicator light will deactivate after regeneration disable is completed.

Ready to Dig - Push button (13) to initiate the ready to dig feature. Ready to dig will perform the following functions: move the bowl to a preset height, open the apron to loading height, lock the cushion hitch and will automatically engage the transmission hold when the operator shifts to 2F gear.

Ready to Haul - Press button (14) to initiate the ready to haul feature. Ready to haul will perform the following functions: raises the bowl as the apron closes, unlock the cushion hitch and the transmission hold is disengaged.

Ready to Unload - Press button (15) to initiate the ready to unload feature. Ready to unload will perform the following functions: lower the bowl to a preset fill height, open the apron fully and brings the ejector forward.

Ready to Return - Push button (16) to initiate the ready to return feature. Ready to return will perform the following functions: raises the bowl to roading height, closes the apron fully, moves the ejector fully rearward and unlocks the cushion hitch.

Engage - Push in the top of the switch in order to engage the parking brake. The parking brake indicator will illuminate. Refer to Operation and Maintenance Manual, "Monitoring System" for further information.

Disengage - Push the locking tab forward and push in the bottom of the switch in order to disengage the parking brake. The parking brake indicator will go out. Refer to Operation and Maintenance Manual, "Monitoring System" for further information.

LOCK - Push the top of the switch in order to lock out the implement controls. An indicator light on the dash will become active showing that the implements have been locked.

UNLOCK - Push the locking tab forward and push in the bottom of the switch in order to unlock the implement controls.

FORCED SHUTDOWN - This position can be used only as an emergency stop to override the features that allow the engine to run after key-off. The engine will continue to run after key-off in order to allow additional shutdown features to complete a cycle. The key must be held in this momentary position for the key-off override to take effect.

OFF - When you insert the key and when you remove the key, the engine start switch must be in the OFF position. A running tractor engine and a running scraper engine will stop running when the key is returned to the OFF position.

ON - To activate the electrical circuits in the cab, turn the key clockwise to the ON position.

START - To start the tractor engine, turn the key clockwise to the START position. After the engine starts, release the key. The key will return to the ON position.

Decrement - Push this button to lower the design plane. Cat Grade Control must be enabled to utilize this function.

Increment - Push this button to raise the design plane. Cat Grade Control must be enabled to utilize this function.

Cat Grade - Press this button to select Cat Grade Control, indicator light (D) will illuminate. Push button (36) to activate Cat Grade Control, indicator light (E) will illuminate. When both indicators are illuminated the system in functional.

Load Assist - Press button (23) in order to select load assist, indicator light (D) will illuminate. Press button (36) in order to activate load assist, indicator light (E) will illuminate.

Access Step (Up) - Press and hold button (24) in order to move the step up. Pressing button (24) will activate button (26) and will illuminate the access step light.

Access Step (Down) - Press and hold button (25) in order to move the step down. Pressing button (25) will activate button (26) and will illuminate the access step light.

Access Step Light - Press button (26) in order to turn on the access step light. Press button (26) again to turn off the access step light.

Secondary Steering Test Switch - Switch (27) allows the operator to manually test the operation of the secondary steering system. Refer to Operation and Maintenance Manual, "Secondary Steering - Test" for the proper procedure.

12V Power Receptacle - This power receptacle can be used to power automotive electrical equipment or accessories. Remove the cap before use.

Cat ET Port - This service port allows service personnel to connect a laptop computer to the machine electronics using Cat Electronic Technician (ET). This connection will allow service personnel to interrogate the machine systems and engine systems.

Cat Grade Control Service Port - This service port is for Caterpillar use only.

Horn - Depress the button (43) in order to sound the horn.

Window Wiper - Rotate the handle away from the operator in order to activate the window wiper. There are six positions for the window wiper.

OFF - When the handle is in the OFF position, the wiper will be off.

INTERMITTENT POSITION - The wiper will operate intermittently.

CONTINUOUS POSITION 1 - The wiper will operate continuously. This is the slow continuous speed.

CONTINUOUS POSITION 2 - The wiper will operate continuously. This is the fast continuous speed.

Front Window Washer - Push the button at the end of the handle in order to activate the window washer.

Dimmer Switch - Push the dimmer switch away from the steering wheel in order to change the headlight beams from low beam to high beam. Also, pull the dimmer switch toward the steering wheel in order to change the headlight beams from high beam to low beam.

Right Directional Turn Signal - Push the lever away from the operator in order to activate the right turn signal. When the lever is pushed forward away from the operator, an indicator light will illuminate on the front dash. The right turn signal will flash until the lever is manually returned to the OFF position.

Left Directional Turn Signal - Pull the lever toward the operator in order to activate the left turn signal. When the lever is pulled back toward the operator, an indicator light will illuminate on the front dash. The left turn signal will flash until the lever is manually returned to the OFF position.

Fan Speed Switch - The fan speed switch controls the four-speed blower fan motor for heating and for the air conditioner. Turn fan speed switch (46) anywhere between OFF position (left) and MAXIMUM position (right).

Temperature Variable Control - This knob will adjust the temperature of the operator compartment. The knob has a heating side and a cooling side. The heating side has a red marking. When you turn the knob all the way to the right, the heater will provide maximum heat. The cooling side has a blue marking. When you turn the knob all the way to the left, the air conditioner will provide maximum cooling. Position the knob for your comfort.

Heating and Air Conditioning Switch - This switch is a three-position switch. The CENTER position of the switch is used to activate the heater. In order to activate the air conditioner, push the switch to the TOP position. In order to activate the (AUTO) position, push the switch to the BOTTOM position.