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5. Using either a hoist and sling or a dolly, lower the axle and place it on blocks or a maintenance stand.

Note: On the HST-1A there are no hydraulic lines connected to the front axle, and only 4 bolts are used to connect it to the axle hanger.

Reinstallation:

1. Using a hoist and sling or a dolly, lift the axle from the blocks or maintenance stand and set it in place on jacks under the vehicle.

2. Reinstall the bolts (16) that secure the axle to each side of the hanger and hand tighten the nuts at this time.

3. Torque the bolts to specification. Install a lock nut over the nut on each of the bolts and torque it to specification.

4. Uncap or unplug the brake and brake cooling lines and reconnect them.

5. Reinstall the front axle driveline to the front axle.

Rear Axle Remove and replace the rear axle as outlined in the following paragraphs.

CAUTION: Always make sure that the axle is properly supported using jacks or

blocking before attempting to remove it from the vehicle.

Removal:

1. Relieve all pressure from the hydraulic sys-tem by venting at the breather and/or loosen-ing the tank cap. Be sure that brake pressure is relieved.

2. Disconnect the transmission to rear axle driveline.

3. Disconnect the brake and brake cooling lines from the wheel ends. Immediately cap or plug each line or connection.

4. Loosen and remove the trunnion caps that secure the the oscillating cradle to each side of the power frame.

Note: On the HST-1A and ST-2D, the axle hanger - oscillation cradle is attached by a trun-nion cap at the rear and a socket assembly at the front. Remove the rear trunnion cap and lower the cradle assembly from the rear and slide back.

5. Using either a hoist and sling or a dolly, lower the axle and place it on blocks or a maintenance stand.

6. To remove the axle from the cradle, remove the 8 small bolts (4 each side) and 8 large bolts (4 each side) that secure the axle to each side of the oscillation cradle.

Reinstallation:

1. Using a hoist and sling or a dolly, lift the axle from the blocks or maintenance stand and set it in place on jacks under the vehicle.

2. Reinstall the trunnion caps that secure the the oscillating cradle to each side of the power frame and hand tighten at this time.

3. Torque the bolts to specification.

4. Uncap or unplug and reconnect the brake and brake cooling lines.

5. Reinstall the transmission to rear axle drive-line to the rear axle.

Tire Demounting And Mounting Procedures

WARNING: Tire and rim servicing can be dangerous, and should be done by trained

personnel using proper tools and procedures.

WARNING: Failure to comply with these procedures may result in faulty positioning

of the tire and/or rim, and cause the assembly to

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burst with explosive force, sufficient to cause serious physical injury or death.

Demounting

1. Connect articulation lock to the frame mounts prior to lifting the vehicle.

2. Attach a Do Not Operate tag to the Off/On/Start switch.

3. Block wheels not being serviced.

4. Using a jack, hoist, or other suitable method, raise the vehicle until the wheel to be ser-viced just clears the ground.

WARNING: Ensure that the method used to elevate the Scooptram is stable and

capable of raising and supporting the weight. If the tire being removed is on an oscillating axle, be sure to block the carrier.

5. Crib or securely block the vehicle before proceeding with wheel removal.

WARNING: DO NOT attempt to remove any rim or wheel components such as lugs

or wheel clamps before all pressure in the tire is exhausted. A broken rim part under pressure can blow apart and cause severe injury or death.

6. Remove the valve core and exhaust all air from the tire. Stand clear or to the side dur-ing deflation.

7. Check the valve stem by running a piece of wire through the stem to make sure it is not plugged before proceeding with wheel ser-vice.

WARNING: DO NOT look into the valve stem while clearing restrictions.

8. Loosen and remove the wheel lug nuts. Remove the wheel using a hoist and sling capable of supporting the load.

CAUTION: Use caution when removing wheels or heavy rim components. Stand to

one side and keep hands and fingers clear when using demounting tools. The tool may slip and cause injury.

9. Demount tire from wheel using accepted shop practices.

MountingReview safety warnings and cautions for dis-mounting before beginning work.

1. Verify articulation locking bar is secured between both frame mounts and Do Not Operate tag is in place on Off/On/Start switch.

2. Verify all blocking and cribbing is securely in place.

3. Clean all wheel and hub mounting surfaces. Remove all dirt, grease or paint before installing wheel.

4. Replace the wheel using a hoist and sling or forklift capable of safely supporting the load. Make sure the valve stem is aligned with any clearance slot in the axle hub.

5. Install mounting hardware and secure the tire and rim in accordance with the torque set-tings specified in Section 3 of the Service Manual.

6. Once the tire is mounted, remove all cribs and blocks.

7. Lower the vehicle to the ground, using jacks, hoists or other suitable method.

8. Remove and stow articulation lock.

9. Remove Do Not Operate tag from Off/On/Start switch.

As a reference the following illustrations show cross-sections of the wheels in common use.

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Type STN or SC earthmover rim double flange

1. Rim base weldment2. Bead seat 3. Lock ring 4. Flange 5. O-ring

Type T Grader - industrial construction rim single flange

1. Rim base weldment 2. Lock ring3. Flange 4. O-ring

Type HTN or HC earthmover rim double flange or locking wheel flange with or without heavy duty driver.

1. Rim base weldment 2. Bead seat 3. Lock ring 4. Flange 5. O-ring 6. Heavy duty driver 7. Locking wheel flange

Type LW highway rim single flange.

1. Rim base weldment 2. Flange

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Type M earthmover rim single flange.

1. Rim base weldment 2. Lock ring 3. Flange

Type HTHM earthmover rim locking wheel flange with heavy duty driver

1. Rim base weldment 2. Bead seat 3. Lock ring 4. Flange 5. O-ring 6. Heavy duty driver 7. Locking wheel flange

Inspection

Inspect wheel components for defects, observing the following precautions:

1. Clean rims and repaint to prevent corrosion and to facilitate inspection and tire mount-ing. Be very careful to clean all dirt and rust from the lock ring and gutter. This is impor-tant to secure the lock ring in its proper posi-tion. A filter on the air inflation equipment to remove the moisture from the air line helps prevent corrosion. The filter should be checked periodically to be sure that it is working properly. Parts must be clean for a proper fit, particularly the gutter section which holds the lock ring in proper position.

2. Periodically check the rim for cracks by removing all dirt and paint and visually inspecting. Replace all cracked, badly worn, damaged, and severely rusted components with new parts of the same size and type. Replace a component when condition is in doubt. Parts that are cracked, damaged, or excessively corroded are weakened. Bent or repaired parts may not engage properly.

Note: Additional inspection for cracks using either dye penetrant or magnetic testing methods is also recommended. Contact your Atlas Copco or tire service representative for further infor-mation.

3. Don’t re-inflate a tire that has been run flat without first inspecting the tire, tube, flap, rim, and wheel assembly. Double check the side ring, flange, bead seat, lock ring, and o-ring for damage and make sure that they are secure in the gutter before installation. Com-ponents may have been damaged or dislo-cated during the time the tire was run flat or seriously under-inflated.

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4. Do not, under any circumstances, attempt to re-work, weld, heat, or braze any rim compo-nents that are cracked, broken, or damaged. Replace them with new parts, or spare parts that are not cracked, broken, or damaged and which are of the same size and type. Heating a part may weaken it to the extent that it is

unable to withstand forces of inflation or operation.

5. Make sure the correct parts are being assem-bled. If you are not sure about the proper mating of rim and wheel parts, consult a rim and wheel chart.

A - Correct

1. Base2. Side Ring3. Proper Fit4. Lock Ring5. Improper Fit6. Flange7. Loose Fit8. Bead Seat Too High

B - Incorrect

1

1

1

11

2 2

2

2

3

3

3

4

41

5

7

5

4

8

6

7

A

B

6

8

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WARNING: Mismatched rim parts are dangerous!!!

Improper rim selection can cause these operating problems:

• Tire Slippage

• Excessive Flexing

• Tube Pinching

• Overheating

• Valve Stem Tear Outs

• Sidewall Failure

• Ply Separation

• Blowouts

Most rims look alike but all vary somewhat in certain design features. It is these differences between rims of different types that make “part mixing” a hazardous business. A close, proper fit between rim parts is essential to long tire life as well as to operating safety.

Very often side-rings, flanges, and lock rings of different types appear to be properly seated, but actually wide gaps are present, frequently diffi-cult to see. The rim cross-sections above show correct, safe matchings of rim parts, as well as mismatched rings and bases which almost always create an unsafe operating condition.

Mounting and Inflating

Observe the following precautions during mounting and inflation:

• Inflate all tires in a safety cage, then use safety chains or an equivalent restraining device during inflation. Mis-assembled parts may fly apart during inflation.

• Don’t inflate a tire before all components are properly in place. With the tire in a safety cage and safety chains or equivalent restrain-

ing devices installed, inflate to approxi-mately 10 psi (69 kPa). Recheck the components for proper assembly. If the assembly is not proper, deflate the tire and correct the problem.

• NEVER hammer on an inflated or partially inflated tire/rim assembly. If the assembly is not proper at 10 psi (69 kPa), deflate the tire and correct the problem. Don’t try to seat rings or other components by hammering while the tire is inflated or partially inflated. Properly matched and assembled compo-nents will seat without tapping. If a part is tapped, it or the tapping tool may fly out with explosive force. Check to make sure all com-ponents are properly seated prior to inflation.

• Don't hammer on rims or components with steel hammers. Use rubber, lead, plastic, or brass faced mallets if it is necessary to tap un-inflated components together. The use of steel hammers may damage the components being hammered and cause an improper fit.

• Never sit on or stand in front of a tire and rim assembly that is being inflated. Use a clip-on fitting or connector with an in-line valve so that the person inflating the tire can stand to the side of the tire, not in front or in back of the tire assembly.

• Stand clear when using a cable or chain sling. The cable or chain may break, lash out, and cause injury.

• Never attempt to weld on an inflated tire/ rim assembly or on a rim assembly with a deflated tire. Heat from welding will cause a sudden, drastic rise in pressure which could result in an explosion with the force of a bomb. The heat from welding can also cause deflated tires to catch fire.

• Never mix parts of one type rim with those of another. Mis-matched parts may appear to

ACW00073 i t

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fit, but when inflated, can fly apart with explosive force.

• Never add or remove an attachment or other-wise modify a rim (especially by welding or brazing) unless the tire has been removed and you have received approval from the rim manufacturer. Modification or heating of a rim or one of its parts may weaken it.

Wheel Assembly

1. Install tire on the wheel. Complete assembly of wheel components.

2. Align driver pockets in bead seat band and base.

3. Insert driving key into driver pocket on base.

4. Make certain that all parts are properly aligned before inflation.

5. When properly aligned, the bead seat band and pocket will move out and lock the drive key during inflation.

6. Inflate to recommended pressure.

7. Mount completed wheel and tire assembly on the axle, then tighten lugs to the specified torque.

8. Remove cribbing or blocks and lower the vehicle.

9. Check that tire is inflated to the specified pressure following the applicable precau-tions listed above.

10. Recheck lug nut torque after first 8 hours of operation.

Note: Outboard drivers are on those rims used in high torque and/or low inflation pressure applications, preventing circumferential move-ment of the rim components. Rim assemblies with an “M” or “L” near the end of the style designation (part number) are so equipped.

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1. Align driver pockets in bead seat band and base as shown.

2. Insert driving key in driver pocket of base

3. Make certain that all parts are properly aligned, as shown above, before inflation

4. When properly aligned, the bead seat band and pocket will move out and lock the drive key during inflation.

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Wheel Nut Torque

Wheel nuts must be tightened in an alternating pattern.

Wheel nuts are to be tightened to the correct torque upon initial installation or reinstallation on the vehicle.

Use only Grade 8 wheel nuts and hardened washers.

Wheel nuts are to be checked for correct torque every four (4) hours for the first twelve (12) hours of operation.

Wheel nuts are to be checked for correct torque every eight (8) hours for the next thirty-two (32) hours of operation. Thereafter, check wheel nuts every one hundred (100) hours, or weekly.

Important: Before mounting and torqu-ing...Remove all paint, dirt and rust from both sides of wheels at mating surfaces around lug bolt holes. THESE AREAS MUST BE CLEAN. Also, clean axle wheel end surfaces which mate with back side of wheels. Proper torque cannot be maintained unless these sur-faces are clean and free of paint, dirt or grease.

Operating Precautions

Observe the following precautions when putting the Scooptram back in service:

1. Don’t use undersized rims. Use recom-mended rim for tire. Consult catalogs for proper time/rim matching.

2. Don’t overload or over-inflate tire/rim assemblies. Check your rim assemblies if

special operating conditions are required. Excessive overload can cause damage to the tire and rim assembly.

3. Never install a tube in a tubeless tire/rim assembly when the rim is suspected of leak-ing. Loss of air pressure through fatigue, cracks, or other fractures in a tubeless rim warns you of a potential rim failure. This safety feature is lost when tubes are used with leaking rims. Continued use may cause the rim to burst with explosive force.

4. Always inspect rims and wheels for damage during tire checks. Early detection of poten-tial rim failures may prevent serious injury.

5. Never add or remove an attachment or other-wise modify a rim (especially by heating, welding, or brazing) unless the tire has been removed and approval has been received

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from the rim manufacturer. Modification or heating of a rim or one of its parts may weaken it so that it cannot withstand forces created by inflation or operation.

Recapping

For some applications, recapping tires can be cost effective alternative to replacement with new tires. Most tires are generally recappable, depending on how well they have been inspected during their service life.

The deciding factor is the severity of the job the tire must do. Some jobs are too tough for recapped tires. High speed, overloading, and long service at low inflation pressure all take too much life out of the cord body for it to last longer than the life of one tread.

Tire Storage

The most important factor about tire storage is to use the tires which have been in stock the longest period of time.

If tires are to be stored for a considerable length of time, the ideal condition is a cool, dry, and dark location, free from air currents. While low temperatures are not objectionable, high room temperature (over 26.7° C / 80° F) is detrimental and should be avoided.

Always keep the floor clean and free of oil and grease. Rubber quickly absorbs petroleum prod-ucts and then swells and becomes soft and spongy.

Particular care should be taken to store tires away from electric motors as they generate ozone which causes rapid aging of the rubber. Keep the storage room dark, or free from direct sunlight. Windows, if given a coat of blue paint, will provide indirect lighting in the daytime which is not injurious.

Atlas Copco Wagner does not recommend the storage of tires out of doors. Where this is neces-sary, whether in transit or stationary storage, tires should be protected from the elements by an opaque waterproof covering. Such tires should be inspected before mounting to be sure they are clean, dry, and free of foreign objects.

Mounting for Storage

When a Scooptram is to be stored for a period oftime, the mounted and inflated tires should beblocked up to remove the load, and the inflationpressure should be reduced to l5 psi (1 bar). Storage of Scooptrams should be under cover, ifpossible, and each tire should be protected fromthe elements by an opaque waterproof covering. If it is not possible to block up the Scooptram, the tire inflation pressure should be increased to 25% above the rated psi for the actual load on the tire in the storage condition. The tires should be checked every two weeks for proper inflation.

The surface area under each Scooptram in stor-age should be firm, reasonable level, well drained, and free of all oil, fuel, or grease. A 1/4 inch to 3/ 4 inch (6.4-19.1 mm) layer of clean gravel under each tire is desirable if the area is not paved. Storage should not be permitted on blacktop or oil stabilized surfaces.

Tires must be inflated to the proper operating pressure before returning a stored Scooptram to service.