MAINTENANCE

J. Tire

Check and Adjust Tire Pressure

Check --- every 10 hours (daily)

Adjust --- as necessary d WARNING: Secure the front and rear frames with the articulation lock bar and ring pins. When inflating tires, stand behind the tire tread and use the self-attaching chuck.

Avoid welding near tires, which could potentially cause the tires to explode.

If the machine catches fire, tires may explode due to emission of heat if any sign of abnormality such as tire smoking, abnormal increase in tire temperature, or the air smells of rubber or tire bead burning is found.

IMPORTANT: Always maintain the correct tire pressure. Even if only one tread pattern has worn out, replace the tire with a new one. Before operating the machine, check the tires for any breaks, damage or foreign matter. When replacing one tire, use a new tire having the same tread pattern and specification as the other tires.

Check Tire Pressure d WARNING: Pay attention not to allow tires to be used with excessively high or low pressure, possibly causing abnormal vibration of the machine during traveling. In addition, cracks of the tires and premature cracks of the wheels may result.

1. Measure air pressure when the tires are cool before operating the machine.

Standard Tire SizeStandard Air Pressure 17.5/65-20-10PR240 kPa (2.4 kgf/cm2) (34 PSI)

2. Check tires for any damage and/or excessive wear.

Maintenance

Check Tire for Damage

--- every 10 hours (daily) d WARNING: If tire has external damaged such as a score, an accident due to puncture or burst of the tire may occur, possibly resulting in personal injury or death.

Check the external appearance of tires for any damage.

Check Wheel Bolt Torque

--- every 500 hours or 6 months (Only first time at 50 hours)

Be sure to check the wheel bolt torque by turning the bolt in the tightening direction.

Tightening Torque: 494 to 604 N·m (50.4 to 61.6 kgf·m) (364 to 445 ft·lb)

Replace Tire d WARNING: Secure the front and rear frames with the articulation lock bar and pins.

IMPORTANT: Allover height of the machine may change according to the type of tires installed. Do not change the specifications of the registered machine.

1. Lower the bucket and lift arm to the ground. Apply the parking brake.

2. Secure the front and rear frames with the articulation lock bar and pins following the procedures described on page 7-6.

3. Loosen all wheel nuts one turn. Note which way the tread pattern is facing.

4. After jacking up the machine, securely support the machine with blocks.

5. Remove the wheel nuts. Replace the tire.

6. With the tire raised off the ground, lightly tighten the wheel nuts in the order as illustrated to the right.

7. Lower the machine to the ground. Retighten the wheel bolts to specification in the order as illustrated to the right.

Tire Sizes to Be Used

Maintenance

fNOTE: Consult with your nearest TCM dealer about the optional tire patterns.

The machine may vibrate depending on tire pattern to be employed during traveling. This is caused by resonance of the machine with the tire pattern not by failure.

TIRE

Standard Size Bias17.5/65-20-10PR Standard Tire Bias17.5/65-20-10PR L2

L2 fNOTE: Regardless of tire patterns to be used, inflate the tire with the same air pressure shown above.

Adjust tire pressure conforming with the work mode the machine is engaged in. Consult your nearest TCM dealer for more detailed information.

• Driving on public roads: Standard pressure

• Loading/excavation on normal ground surface: Standard or slightly higher than standard pressure

• Heavy-duty excavation: Higher pressure in the standard pressure range

• Operation on soft terrain or sandy territory: Slightly lower than standard pressure

Tire Pressure Adjustment Range: 240 to 260 kPa (2.4 to 2.6 kgf/cm2) (34 to 37 PSI)

Maintenance

Tire Rotation

Rotate tires when uneven or abnormal wear is recognized on either front or rear, or right and left tire. Tire rotation is recommended to achieve uniformity of wear on tires or equalization of tire service life.

Rotation Method

d WARNING: Install tire with no external damage such as score and abnormal wear. Failure to do so may cause the puncture or the tire to blowout, possibly resulting in personal injury or death since tire load is increased when the machine is loaded or braked during operation.

• Switch tires only between the front and rear positions. Do not switch the tires between diagonal positions.

• Align the tire rotation direction with the tire tread design pattern. Especially traction read design pattern (optional) will affect not only economy of the tire but also safety in operation.

How to Check Wear Amount (Tread Design Groove Depth)

IMPORTANT: If the machine is operated with tires at either rear or front being extremely worn or different in type, construction, or size, the travel driving system such as axles or transmission will be adversely affected in their performance and/or endurance. Avoid operating the machine under such conditions.

When replacing tires, be sure to use the same tires in type, construction and size on all four wheels. It is recommended to replace all four tires at the same time.

Measure the groove depth at position of 1/4 tread width [shown with X mark (1) in the figure].

Use limit of the groove depth shall be approx. 85 % of the new tire groove depth. In case extreme uneven wear or exposed rubbing strips are found, replace the tire even before reaching 85 %.

Removal and Installation of Tire

d WARNING: Wheel with tire is a very heavy part so that removal and installation of tire is hazardous and difficult work. In addition, a crane to lift the tire is required when removing or installing the tire to the wheel. Consult your nearest TCM dealer or professional tire sales shop for tire removal and installation work.

In case jacking up the machine is required, be sure to observe the following points.

• Select dry, solid and level ground for work site.

• Work in groups of more than two personnel. One person shall mainly engage in the repair work and others shall work as assistants and/or to ensure safety.

• Do not use the bucket to raise the front wheels.

• Do not raise the machine off the ground more than necessary.

• When the front (or rear) wheels are raised off the ground, wedge wheel stoppers under the rear (or front) wheels.

• After the machine is raised off ground, be sure to block the machine using rigid supports. Never leave the machine supported only by jacks.

• The rear wheels oscillate. Insert wooden blocks between the axle and the frame to stop oscillation.

• When removing the wheel nuts, lift the wheel with a crane so that the wheel nut remaining at the top position is finally removed.

• Refer to Check Wheel Bolt Torque for the wheel bolt tightening torque value.