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| Illustration 1 | g02725242 |
(1) Alert indicator for the secondary steering system (2) Transmission hold control (joystick) (3) Parking brake control switch (4) Top gear control (5) Transmission control (6) Service brake control | |
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When you operate the machine in very rough ground conditions or at travel speeds not suitable for the ground conditions, this may result in excessive seat vertical travel with impact of the suspension against the travel stops, which may cause injury. Do not operate the machine on ground conditions and at travel speeds that could result in the seat suspension travel stops being contacted. In order to minimize impact loading on the operator, properly adjust the seat controls based upon your weight and based upon your height. Refer to the Operation and Maintenance Manual, "Seat" for more information. |
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There is restricted visibility to the area directly behind the machine. Failure to make sure the area is clear could result in injury or death. Use a second person on the ground to make sure that the area is clear before you operate the machine in the REVERSE position. Refer to the Operation and Maintenance Manual, "Operation Information" for more information. |
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Visibility behind the machine is restricted from the operator station. Before you operate the machine in the REVERSE position, a second person on the ground is to be used to make sure the area is clear. The person that provides the direction must remain in sight of the operator at all times. Stop the machine if the person that provides the direction cannot be seen or understood.
To prevent injury, make sure that no people are on the machine or near the machine. To prevent injury, keep the machine under control at all times.
Reduce engine speed when you maneuver in tight quarters or when you are going over a hill.
Select the appropriate travel speed before you begin to drive the machine downhill. Do not shift the transmission control while you are going downhill.
When you drive the machine downhill, use the same gear speed that would be used to drive the machine uphill.
Do not allow the engine to overspeed when you go downhill. Do not disengage the transmission while you are traveling downhill. Use the service brake control to reduce engine overspeed when you are going downhill. Never coast the machine.
Adjust the operator's seat. Fasten the seat belt.
Do not operate the machine when the parking brake is applied.
Loading the machine in a straight line is preferred.
Do not overload the bowl.
Operating The Machine
- Check for adequate clearance around the machine.
- Adjust the operator seat.
- Adjust the mirrors.
- Adjust the steering column.
- Fasten the seat belt.
- Raise the bowl in order to pass over any obstacles.
- Depress service brake control (6) in order to prevent the machine from moving.
- Push the bottom of parking brake control switch (3) in order to release the parking brake.
- Move the transmission control to the desired direction and the appropriate gear speed.
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For operator comfort and maximum service life of power train components, deceleration and/or braking is recommended before any directional shifts are made. |
- Release the service brake control.
- Depress the throttle pedal until you achieve the desired engine speed.
- Drive the machine forward in order to have the best visibility and the best control.
Secondary Steering (If Equipped)
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If the secondary steering system activates during operation, immediately park the machine in a safe location. Do not continue to operate the machine using the secondary steering system. Extended operation of the secondary steering motor could damage the motor and result in a loss of emergency steering capability. The secondary steering system should be used for towing the machine or other service procedures. Personal injury or death can result if steering is lost during operation. |
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If alert indicator (1) illuminates red, steer the machine immediately to a convenient location and stop the machine.
Make any necessary repairs before you return the machine to operation.
Alert indicator (1) illuminates amber to indicate that the secondary steering system is engaged. When the secondary steering system is engaged, the primary steering system has failed. The secondary steering system will provide steering for a limited time. The secondary steering indicator will illuminate when the secondary steering system is active. The system uses an electric driven steering pump to allow steering of the machine. The secondary steering system will provide steering for a minimum of 1 minute when a typical single component failure occurs. The secondary steering system operates when the machine is stationary or when the machine is traveling in FORWARD or REVERSE direction.
Changing Direction and Speed
Reverse speed, first gear forward must be manually selected.
The automatic range is second gear through eighth gear. For each job condition, the transmission will automatically upshift and downshift the transmission between second gear and the top gear being used. Move transmission control (5) in one smooth motion. During load cycles, haul cycles and dump cycles, manual shifting is not recommended.
Use transmission hold control (2) to prevent unwanted shifts.
Use top gear control (4) in order to set the top speed to be used.
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The machine must be stopped and the engine at low idle before changing direction. After moving the transmission control, do not accelerate until after hearing or feeling the transmission clutches engage. |
Upshifting
As the engine is accelerated and the ground speed increases, the transmission will upshift. The transmission will upshift one speed at a time. The transmission will upshift automatically between second gear and the highest gear that has been selected.
Moving transmission control (5) does not force immediate shifting of the transmission. The shifting of the transmission is governed by the machine ground speed.
Use transmission hold control (2) in order to prevent unwanted upshifts, whether approaching a downgrade, loading material, or operating on rough terrain.
Use transmission hold control (2) in order to prevent unwanted upshifts when the machine is loading material and when the machine is dumping material on rough terrain.
Downshifting
If the ground speed is reduced or if the engine speed is reduced by an increased load, the transmission will automatically downshift in order to select the correct transmission speed.
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The transmission is equipped with a downshift inhibitor. The transmission will not necessarily downshift when the transmission control is moved. This protects against engine overspeed. Accidental downshifting of the transmission control does not mean forced or immediate shifting of the transmission. |
As the machine slows, the transmission will automatically downshift to match operating conditions. Move transmission control (5) to the NEUTRAL position if you intend to stop the machine.
Shift Inhibiting
A shift from any FORWARD gear into NEUTRAL position is inhibited when the machine is traveling at a speed greater than 5.6 km/h (3.5 mph).
Normal Shifting
An automatic downshift will occur when the engine speed decreases to approximately 1280 rpm. An automatic upshift will occur when the engine speed increases to approximately 1800 rpm. The shifting of the transmission is determined by the load that is put on the machine.
If the ground speed is less than 5 km/h (3 mph) in any forward speed and the transmission control is moved to the REVERSE position, the transmission immediately shifts intoREVERSE.
If the ground speed is more than 8 km/h (5 mph) in any forward speed and the transmission control is moved to REVERSE, the transmission will not shift to REVERSE until the ground speed of the machine has been reduced to 5 km/h (3 mph). When the ground speed is less than 5 km/h (3 mph) in NEUTRAL and the transmission control has been moved to REVERSE, the transmission immediately shifts to REVERSE.
Top Gear Control
Top gear control (4) is used to set a limit for upshifts. The transmission control must be moved to "D" in order for you to select a limit. "D" is the DRIVE position. When the switch is depressed, the actual gear indicator will have the reverse image of the normal display. Next, the actual gear indicator will cycle through the available gears. When the switch is released, the top drive gear will be set to the value on the display. The display will show the top gear for 4 seconds. After the 4 seconds, the display will revert to the actual gear. The maximum gear that is available to the operator will never be greater than the maximum gear that is set by the service personnel. The minimum top gear that is available to the operator is third gear in the forward direction. The transmission will operate with a high gear limit until the machine is turned off or until another gear is selected.
Note: When the engine experiences an overspeed condition, the top gear control will allow the transmission to upshift one speed in order to correct the overspeed condition.
Transmission Hold Control Activated
When transmission hold control (2) is placed in the ENGAGED position, automatic shifts are inhibited. Automatic downshifts are inhibited unless the engine is in an underspeed condition. The transmission will automatically downshift if the engine rpm drops too low. Underspeed conditions will occur when the engine rpm drops below 1000 rpm. Automatic upshifts are inhibited unless the engine is in an overspeed condition. If the engine speed reaches 2400 rpm, the transmission will automatically upshift.
Braking Operation
The braking system consists of three separate controls: service brake control (6) , parking brake control switch (3) and retarder control (1) .
Service Brake
The service brakes on Wheel Tractor-Scrapers are designed to stop the machine.
Parking Brake
All four wheels of the Wheel Tractor-Scraper are equipped with parking brakes. The parking brakes and service brakes use the same brake actuator to activate the brakes.
Push the top of parking brake control switch (3) . This will increase hydraulic pressure to release the parking brakes.
Note: Allow the machine to reach normal operating temperature before engaging or releasing the parking brake. The parking brake may take up to 10 seconds to engage or disengage during extreme cold ambient temperatures. If the parking brake does not engage within 2 seconds, the parking brake indicator will illuminate and flash. Once the parking brake engages, the parking brake indicator will stay illuminated but will not flash. If the parking brake does not engage within 6 seconds, a warning will be displayed on the digital display.
Note: If the machine is restarted with the parking brake switch disengaged, engage the parking brake switch for 2 seconds, then disengage the parking brake switch to disengage the parking brake.
The action alarm will also sound if the transmission control is moved out of the NEUTRAL position during engagement of the parking brake.
Retarder
The retarder equipped is an engine compression brake which releases compressed air before it can act as a spring and continue to propel the machine.
Engage the retarder control in order to slow the machine ground speed. The tractor transmission must be in 3F and the throttle controls must be disengaged, in order for the retarders to engage. Refer to Operation and Maintenance Manual, "Operator Controls" for more information.
Use the retarder on a downgrade to prevent engine overspeed.
Use the retarder to help to stop the machine. The retarder will not completely stop the machine and the retarder will not hold the machine stationary.
Retarding on a Downgrade
Machine speed is very important because a lower speed increases the effective force of the retarder. Generally, the speed that is used to negotiate an empty machine on an upgrade should be used to drive a loaded machine on a downgrade of the same slope. Readjust the speed after a trial run.
Before you approach a downgrade, slow the machine. Anticipate the need to use the retarder. Select retarding level in order to engage the retarder and disengage the throttle controls in order to disengage the retarder. Refer to Operation and Maintenance Manual, "Operator Controls" for more information.
The retarder will engage in less than one second. The transmission control will allow the transmission to shift as necessary to maintain higher engine speeds and higher retarding force.
Select the proper transmission gear that will allow the retarder to maintain a safe ground speed. with little use of the service brake control.
Never coast down a grade in NEUTRAL. Always keep the transmission in gear. The chassis ECM will prevent shifting from a forward gear to NEUTRAL at ground speeds that are greater than 8 km/h (5 mph). The chassis ECM will also prevent shifting from a forward gear to REVERSE at grounds speeds that are greater than 5 km/h (3 mph). If you attempt to prevent upshifting on a downgrade that is long or steep, retarding can be unsuccessful. The transmission control should be in the desire gear before you start the downgrade. If you rely on retarding, engine speed may reach the upshift point.
Differential Lock
For the location of the differential lock control switch, refer to Operation and Maintenance Manual, "Operator Controls".
Lock the differential when traction is poor. Both wheels will turn at the same speed.
The differential lock will provide maximum traction at all times. The differential lock can prevent wheel slippage. Depress the differential lock control switch when the machine is moving on soft ground or on wet ground. Excessive wheel spin and uncontrolled wheel spin can cause accelerated wear to certain components of the drive train.
To prevent damage to the differential lock, do not engage the differential lock control switch at high speeds.
Do not turn the machine while the differential lock is engaged.
Do not engage the differential lock control switch while one wheel is spinning. Decrease the engine rpm until the wheel stops spinning. Anticipate using the differential lock before wheel slippage occurs.
The differential normally unlocks when the floor switch is released. In areas of high resistance, it may be necessary to turn the machine slightly in order to unlock the differential. Decreasing the engine rpm may also be helpful.