Great Dane Champion CP Посібник з технічного обслуговування - Сторінка 8

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wheel bearings

continued

INSPECTION

Inspect the inner and outer wheel bearing cups, cones

and rollers for excessive wear or damage.

Refer to bearing and axle manufacturer's manuals for

inspection and replacement requirements.

LUBRICATION

For maximum bearing life, inspect wheel bearings and

lubricant periodically, change lubricant regularly, and

clean the hub assembly properly.

If you do not clean the hub assembly properly both

originally and in subsequent service, you must adhere

to a shorter lube change schedule. When adding oil or

checking oil level, be certain to clean the cap and plug

before disassembling, to help keep out dirt and road

grime.

When you clean and dry parts or bearings for later use,

pack and coat them with wheel bearing lubricant and

wrap in clean waxed paper to prevent surface

corrosion that might cause premature bearing failure.

1. Remove wheel hub and bearing cones. Clean all

old grease or oil from wheel hub, bearing cones,

and hub cap with kerosene or diesel fuel oil and a

stiff fiber (not steel) brush.

2. Allow the cleaned parts to dry, or dry them with a

clean absorbent cloth or paper. Grease and oil

will not adhere to and protect a surface wet with

solvent. The solvent may dilute the lubricant.

Clean and dry your hands and all tools.

danger

DO NOT USE GASOLINE. Also, do not clean

these parts in a hot solution tank or with water

and alkaline solutions such as sodium hydroxide,

orthosilicates or phosphates.

3. Inspect oil seals, oil seal wiping surfaces, bearings,

and bearing cups for indications of wear or damage.

Replace any worn or damaged parts. Handle the

bearing carefully during inspection (and packing, if

grease is used) so the cage will not be bent or the

rollers and cone damaged.

GREASE-LUBRICATED WHEEL BEARING

Depending on operating conditions, speed, and loads,

change lubricants whenever you replace seals, when

you reline brakes, or every 100,000 miles (or Spring and

Fall if yearly mileage is less).

At rebuild time, before you install wheel bearings

onto spindle, coat bearing journals (to deter fretting

corrosion) with a film of Lithium, 12-Hydroxy stearate

grease or its equivalent.

RECOMMENDED WHEEL BEARING

GREASE SPECIFICATIONS

Soap Type – Lithium, 12-Hydroxy stearate

or equivalent.

Consistency – NLGI No. 2 or NLGI No. 1

Corrosion and Oxidation Inhibitors

Base Oil – Solvent Refined Petroleum Oil

Base Oil Viscosity

at 210˚ F . . . . . . . . . . . . . 75 SUS (Minimum)

Pour Point . . . . . . . . . . . + 10˚ F. (Maximum)

When you service grease-lubricated wheel bearings:

1. Pack bearing with pressure packer, if possible. If

not, pack by hand, forcing the grease into the cavi-

ties between the rollers and cage from the large

end of the cone.

2. Pack the hub between the two bearing cups with

grease to the level of the smallest diameter of the

cup.

3. Assemble the hub and bearings on the axle, being

careful not to damage the oil seals or bearing.

Adjust the bearings.

OIL-LUBRICATED WHEEL BEARING

Check oil-lubricated wheel bearings every 1,000 miles.

Change oil when you replace seals, when you reline

brakes, or at least once a year. Use a gear-type oil: SAE

140 if temperature is above freezing, SAE 90 if tempera-

ture is below freezing, or a multipurpose oil with an SAE

range of 85 to 140 for year-round

conditions.

SERVICE

When you service oil-lubricated wheel bearings:

1. Wipe a film of oil on the bearing spindle to prevent

rust behind the inner bearing cone.

2. Assemble the hub and bearings on the axle, being

careful not damage the oil seals or bearings. Adjust

the bearings.

3. Fill hub with oil to level indicated on cap, as shown

in the illustration on the opposite page (pg. 13).

NOTICE:

Always clean cap and plug before

reassembly.

4. Rotate wheel and recheck lubrication level.

Lubrication fill oil (static)

Fill to

oil level line

on hub cap

window

suspensions

warning

Broken spring leaves, missing or loose U-bolts,

or other defective conditions likely to cause

axle shift are hazardous.

Check wear pads in hangers. If they are wearing thin,

install new pads or the spring will cause permanent

damage to the hanger. Do not operate with broken

spring leaves.

Check to see if all springs can make proper contact

with wear pads. Twisted springs and cocked hangers

can cause uneven spring contact with wear pads, and

will result in excessive wear on the suspension.

Check to see if there is sufficient clearance between

the springs and the sides of the hangers and rockers.

Improper spring centers or hanger spacing can create

binding in this area, resulting in excessive wear.

Check the equalizer to see that there are no obstruc-

tions to movement during operations. If equalizer move-

ment is restricted by an obstruction, the axle "walk" will

not be sufficient and damage will result.Check the rock-

er beam to see if there is adequate clearance between

the ends of the spring and the rocker beam hub when

the axle is both loaded and unloaded.

Check welds to see that no cracking has occurred

between the spring seats and axles, and between

the hangers and sub-frame.

Threaded fasteners should be checked for proper

tightness after an initial break-in period of 3,000 to

5,000 miles. Torque should be rechecked every

25,000 miles.

The replacement of worn bushings is considered

normal preventative maintenance. Bushings showing

signs of wear should be replaced before they damage

the parts they are pressed into. Routine torque

maintenance will prolong the life of bushings.

Lubrication fill semi-fluid grease (No. 00)

Fill to 3 and

9 o'clock level

Brush a light film of

grease on axle nut and spindle end and

around inner surface of hubcap being

careful not to cover vent plug

AIR-SPRING SUSPENSION

The air-spring suspension height is controlled by height

control valves that maintain a constant trailer height by

pressurizing or exhausting air in the air springs as

needed to support the load being carried.

You must build up to and maintain your trailer's air

pressure at more than 70 psi for van trailers and 80 psi

for platform trailers before operating the trailer. The air

protection valve will not operate until you have 70 psi

on van trailer and 80 psi on platform trailers in the

system. This valve automatically maintains a safe air

brake pressure higher than 70 psi for van trailers and

80 psi for platform trailers in the event of an air loss

due to a failure in the suspension system.

If an air-spring failure occurs on one side, it is

recommended to completely deflate the suspension

and temporarily operate on the air springs' internal

rubber bumpers to allow your trailer to be moved to

a shop for repairs.

To deflate or cut off the air pressure to the damaged

air spring, disconnect the height control valve actuating

levers from their link assemblies and rotate to the

vertical down position.

Check air lines and fittings for leaks.

Check air springs and proper clearance when inflated –

minimum clearance is 1 3/4".

Check axle clamp group to be sure that all bolted

connections are properly torqued. For proper torque

requirement refer to the suspension manufacturer's

maintenance manual. Worn component parts or loose

U-bolts can allow the vehicle to roll or sway.

Excessive play in the beam pivot connection area can

cause premature tire wear and erratic handling

characteristics. Loose bolts at this connection will

cause the rubber bushings to wear out prematurely.