Great Dane Champion CP Manual de mantenimiento - Página 9

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suspensions

continued

The shock absorbers should be replaced at the first

sign of leaking hydraulic fluid. Worn shocks will allow

tire hop and yield poor handling characteristics.

Many air suspensions are equipped with air control

kits. The air control kit allows the raising or lowering

of the vehicle bed by inflating or exhausting air from

the air suspension. Do NOT operate the vehicle when

the suspension is in the lowered or raised position.

Improperly maintained air suspensions will result in

trailer suspension damage which includes bushing

wear and irregular tire wear.

By customer specification, Great Dane may have

installed any of the following air-spring suspensions on

your new trailers.

Neway or SAF Holland models

Reyco models

Hendrickson models

Meritor models

Tuthill models

Please reference the bibliography in the back of the

manual to obtain address for ordering manufacturer-

specific maintenance manuals.

running gear assembly

Inspection of upper running gear rail weld attachment

to the trailer for weld fatigue cracks is a requirement of

the annual FMCSA inspection. All trailer structures

should be inspected for weld fatigue cracks and/or

loose fasteners and any found should be corrected as

a part of routine PM (preventative maintenance) serv-

ice. Any defects in a trailer should be corrected to the

manufacturer specifications before the trailer is

returned to service.

FIXED SUSPENSION

1. If the trailer is equipped with a fixed suspension,

visually check all bolts connecting the suspension

frame assembly to the upper running gear rails.

2. If these bolts need replacing, use only Grade 5

(minimum) bolts with Grade B (minimum) locking-

type nuts. Be careful in selecting the proper bolt

grip length so that threads are not at the interface

of the rail/frame joint.

SERVICING RIMS & WHEELS

For information on servicing wheels and rims, refer to

OSHA 29 CFR 1910.177 and to the appropriate wheel

and rim manufacturer's manuals. Also refer to

Servicing Single-Piece and Multi-Piece Rim Wheels,

U.S. Department of Labor pamphlet, OSHA 3086 and

the accompanying two chart set, available from OSHA

regional offices.

LEAF-SPRING SUSPENSION

Check the torque of all suspension bolts after initial

break-in period on the road and thereafter at regular

intervals not to exceed 25,000 miles. Follow the

torquing recommendations of the suspension

manufacturer. If they are not available, use the follow-

ing table of torque recommendations for clean dry

threads. The use of lubricants will apply more tensile

force for the same torque. If lubricants are used,

decrease torque approximately 30%.

14 UNC

350 -375 lb-ft

7/8"

14 UNF

275 -300 lb-ft

5/8"

18 UNF

75 -90 lb-ft

5/8"

18 UNF

125 -155 lb-ft (step bolts)

1/2"

45 -50 lb-ft

It is especially important to maintain torque on U-bolts,

equalizer bolts, and torque arm bolts. Torque the nut

side of torque arm bolts only. Torquing the bolt heads

will not produce the desired clamping force.

NOTICE:

Loose U-bolts can result in spring

damage. Improperly torqued bushing bolts can

produce premature bushing wear.

warning

Tire and wheel/rim servicing can be extremely

dangerous and must be done only by trained

personnel using proper tools and procedures.

Information about tire and wheel servicing can

be obtained from:

US Department of Labor

OSHA Publications Office

200 Constitution Ave, NW

Room Number N3626

Washington, DC 20210

Telephone: 800-321-6742

NHTSA

Auto Safety Hotline

1200 New Jersey Avenue, SE

Washington, DC 20590

Telephone: 800-424-99153

www.safercar.gov

danger

Tires must only be inflated while in a restraining

device/safety cage.

SINGLE-PIECE RIM WHEELS

Illustrated, complete safe operating procedures are

provided on the wall chart "Mounting and Demounting

Procedures for Truck/Bus Tires" available from the

Department of Transportation, and OSHA.

The following minimum steps are recommended to

provide maximum safety when servicing single-piece

wheels:

• The tire must be completely deflated by the

removal of the valve core before demounting.

• Mounting and demounting of the tire must be per-

formed only from the narrow ledge side of the

wheel. Care must be taken to avoid damaging the

tire beads, and the tire must be mounted only on a

compatible wheel of mating bead diameter and

width. Proper tools must be used.

• A non-flammable bead lubricant must be applied to

bead and wheel mating surfaces before assem-

bling, unless the wheel manufacturer recommends

against the use of any lubricant.

rim and wheel inspection

and maintenance

1. Check all metal surfaces thoroughly, including area

between duals and on inboard side of wheel.

Watch for:

a. Excessive rust or corrosion buildup

b. Cracks in metal

c. Bent flanges, resulting from road obstructions

d. Deep rim tool marks on rings or in gutter areas

e. Loose, missing or damaged nuts or clamps

Bent or stripped studs

g. Damaged or missing rim drive plates

h. Mismatched rim parts

2. Remove damaged rims or wheels.

• If a tire changing machine is used, the tire may be

inflated only to the minimum pressure necessary to

force the tire bead onto the rim ledge and create an

airtight seal before removal from the tire changing

machine.

• If a bead expander is used, it must be removed

before the valve core is installed and as soon as the

rim wheel becomes airtight (when the tire bead

slips onto the bead seat).

• The tire must always be inflated within a restraining

device/safety cage.

• The tire must not be inflated to more than the cold-

inflation pressure molded in the sidewall unless a

higher pressure is recommended by the manufac-

turer.

• Cracked, broken, bent, or otherwise damaged

wheels must not be reworked, welded, braced, or

other wise heated.

3. Mark damaged or hazardous areas so that part will

be removed from service.

warning

Excessively corroded or cracked rims or rings

can be dangerous. Deflate tires prior to the

removal of rims or wheels from vehicle.

4. Replace damaged parts. Insure that replacements

are made with the proper sizes and types of rim

wheels.

danger

Be sure that replacements are made with the

proper sizes and types of rim wheels.

5. Inflate tires only to recommended air pressures.