Great Dane Champion CP Manuel d'entretien - Page 12

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axle alignment

continued

5. Measure the distance, on each side, from the cen-

ter of the end of the front axle to the center of the

end of the rear axle (measurements C and D of the

tandem-axles illustration). These measurements

must be within 1/16" of each other. (Illustrated is a

gauge that simplifies this measurement.) It can be

made of drill rod or pipe fittings. The materials and

details are less important than that the resulting

gauge be rigid and true. (The pointer arms of the

gauge should be parallel and in the same plane.)

CORRECTING MISALIGNMENT

If any of the related measurements are not within stated

dimensions, inspect the trailer suspension thoroughly

for loose, worn, or broken connecting and supporting

parts. Replace worn or broken parts. Then adjust the

suspension to bring the axle or axles into alignment.

upper coupler and kingpin

Inspect the kingpin and the upper coupler on the trailer

at regular intervals to be sure that they have not suffered

damage or undue wear. Although the kingpin is made

of hardened forged steel, it is still subject to wear and

can be chipped or broken with abuse. Always check

the bottom locking flange of the kingpin to determine

its condition. The upper coupler fasteners should be

inspected to see that they are in place and properly

tightened.

Before coupling the trailer to its tractor be certain that

the tractor fifth wheel is properly lubricated and the fifth

wheel jaws are open to receive the kingpin.

If the bottom rail attachment fasteners of a van upper

coupler are damaged they should be replaced with

fasteners of the same design and strength. Loose or

missing fasteners must be replaced. Great Dane should

be contacted for replacement information. If this infor-

mation is not available, Grade 5 (minimum) bolts and

Grade B (minimum) locking type nuts may be used but

must be torqued properly.

Be careful in selecting the proper bolt grip length so

that threads are not at the interface of the coupler/rail

joint. It is recommended that, if possible, the next

larger diameter fastener should be used to provide a

good tight fit. If this is not practical, then replace the

When there is a slight amount of irreducible misalign-

ment in one axle assembly of a tandem-axles trailer,

the other can sometimes be moved a corresponding

amount in the opposite direction to reduce the tendency

of the trailer to "dogtrack", but it should not be moved

more than 1/16" from its optimum alignment position.

This method of correcting misalignment is not recom-

mended as a permanent and sound solution – there is

no substitute for correctly installed and aligned axles.

The limits of 1/8" appear very small compared with the

overall dimensions of the trailer, but they are recognized

as the maximum permissible limits of misalignment.

Also, the relatively small size of these limits makes it

important that the measurements be accurate.

TOE-IN AND TOE-OUT

Toe-in and toe-out can be checked accurately with front

axle aligning equipment designed for automotive serv-

ice.

AXLE CAMBER

Axle camber should be measured accurately on an

alignment machine made for the purpose. It is often

advisable to consult a qualified specialist with the

equipment both to measure and to correct errors of

camber. NOTE: Most trailer axles have no camber.

fastener with the same size as removed. Drill a

companion hole of the same diameter with proper

spacing between the holes and add an additional

fastener. This method assures adequate fasteners to

contain the upper coupler loads.

BOLT TORQUE REQUIREMENTS

CLEAN DRY THREADS

LB-FT

BOLT SIZE

GRADE 5

GRADE 8

3/8" UNC

3/8" UNF

1/2" UNC

110

1/2" UNF

120

5/8" UNC

150

220

5/8" UNF

180

240

1" UNC

580

900

1" UNF

640

1000

pintle hook

1. Clean and check for proper operation. This should

be done at each TPM.

2. Inspect for worn, damaged or missing parts.

Replace only with compatible replacement

components.

3. Regularly lubricate the latch and lock pivots with a

light-oil lubricant. On models equipped with a

grease fitting, apply a small quantity of grease

through the grease zerk fitting.

support gear

The support gear and brace system is designed to

support a fully loaded trailer at its rated GVWR when

parked on a solid level surface. The brace system and

the mounting bolts should be maintained as manufac-

tured to provide a safe operating condition. Damaged

components must be replaced before the vehicle is

reloaded.

SUPPORT GEAR LUBRICATION

1. Lubrication quantity and recommended intervals

vary according to the conditions in which the

support gears are operated. It is good preventive

maintenance to lubricate the support gear one

time during the first six months of use and every

twelve months thereafter.

2. In severe cold-temperature operations, many

fleets completely fill the top head and gear box

with a high-quality, low-temperature lubricant.

rear impact guard

MAINTENANCE AND REPAIR

Federal Motor Carrier Safety Regulations for rear

impact guards require the proper maintenance and

repair of trailer guards. Trailer guards are subjected to

impacts and stress in docking and loading operations.

These impacts, as well as the stresses applied by the

use of dock restraint equipment, if excessive, can

damage any rear guard. A damaged guard may not

satisfy the performance requirements now mandated

by NHTSA and FMCSA, and may not be as strong as

originally designed and manufactured by Great Dane.

Great Dane cannot be responsible for a guard that

has been damaged, or for one that is not repaired in

accordance with Great Dane's design and manufactur-

ing specifications.

Rear impact guards clearly now have attained the

status of safety equipment and are as important as

lighting and reflector systems or braking systems,

which are also regulated by NHTSA, FMCSA and most

state departments of transportation. Pre-trip inspec-

tions have for years included the DOT bumper. Now

the integrity of rear impact guards must be maintained

to meet NHTSA standards. Broken welds, bent

components, missing or loose fasteners, excessive

corrosion or other damage to any trailer guard will

likely affect its performance in the event of a rear-end

collision. For these reasons, detailed guard inspection,

4. Check mounting bolts for proper torque. For 3/4"

bolts with dry threads use 275-325 lb-ft for grade

5 bolts and 400-450 lb-ft for grade 8 bolts.

5. Check air plunger adjustment. Refer to the

recommendations of the pintle hook manufacturer.

6. The structural mounting assembly must be

inspected at each TPM to insure against fatigue

problems.

service and repair records should be maintained on

all guards for your protection. Repairs must be made

in accordance with the guard's original design specifi-

cations. Any question regarding the repair of a Great

Dane guard should be directed to one of Great Dane's

Distributors or Branch Parts and Service facilities,

which are avail- able to discuss any proposed repair

with its customers. Where possible, Great Dane

recommends that all guard repairs be made at one

of Great Dane's service facilities.

PRESERVATION OF EVIDENCE

In the unfortunate event that a Great Dane trailer is

impacted by another vehicle in a rear-end collision, it

is essential for the protection of both you and Great

Dane that the condition of the guard and its attach-

ments be documented immediately. If possible, photo-

graphs should be taken before the vehicles are sepa-

rated. Photographs should also be taken after separa-

tion, including photographs showing the trailer under-

structure and all guard attachment components.

These photographs should be taken before any repair

is made. Moreover, any guard components that are

removed as part of a repair should be labeled and

saved until all claims arising out of the accident have

been resolved. If you have any questions about these

instructions, please contact Great Dane's Customer

Service Department.