Engine JAC HFC4DA1-2C. Manual - part 154

RAX

RAX

RAX

RAX Rear

Rear

Rear

Rear Axle

Axle

Axle

Axle

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Adjustment of meshing marks:

Contact status of driven gear
working flank

Causes

Adjusting

method

A-Tooth

surface

contact

area

adjustment

B-Backlash adjustment

Deflected

to addendum

High driving gear, driven gear too
far

1. Driven gear away from driving gear

2. Driving gear close to driven gear to
obtain

correct

backlash

(adding

washers)

Deflected to dedendum

High driving gear, driven gear too
close

1. Driven gear close to driving gear

2. Driving gear away from driven gear
to obtain correct backlash (reducing
washers)

Deflected to small end

High driven gear, driving gear too
close

1. Driven gear away from driving gear

2. Driving gear away from driven gear
to obtain correct backlash (reducing
washers)

Deflected to big end

High driven gear, driving gear too
far

1. Driven gear close to driving gear

2. Driving gear close to driven gear to
obtain

correct

backlash

(adding

washers)

RAX

RAX

RAX

RAX Rear

Rear

Rear

Rear Axle

Axle

Axle

Axle

-140-

Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

Troubleshooting

Troubleshooting

Troubleshooting

Troubleshooting

Fault

Causes

Solutions/Preventive Measures

Hub bearing sluggish

Excessive preload for hub bearing

Adjust the preload.

Bearing lack of lubricant or adoption of improper
grease

Add or change grease.

Bearing contaminated by dust

Clean and add grease.

Hub bearing sluggish

Poor camshaft lubrication or adjusting arm failed to
return

Add grease or correct faulty parts.

Wheel sticking

Return spring fracture or fatigue for brake shoe or
air chamber

Replace faulty parts.

Abnormal

driving

sound

Improper differential gear clearance

Replace washer or gear.

Excessive clearance between driving and driven
gears

Replace washer or gear.

Too small driving gear bearing preload

Adjust preload.

Abrasion or damage of differential gear, planetary
gear, spider thrust washers and etc.

Correct or replace faulty parts.

Too low oil level

Add lube oil.

Lube oil leak

Wear, looseness or damage of oil seal

Replace oil seal.

Looseness of final drive fastening bolt or damage of
sealant

Tighten bolt or reapply sealant.

Looseness of bearing support fastening bolt

Tighten bolt to the specified torque.

Looseness of drain plug or damage of lining

Tighten plug or replace lining.

Axle housing deformation due to overloading

Correct or replace axle housing.

Vent plug blockage or damage

Clean or replace vent plug.

Insufficient brake force

Overheating or deterioration of brake lining

Replace brake lining.

Improper fitting of friction lining

Correct the fitting position of brake lining.

Brake drum flooded by water

Depress the pedal slightly during running to drain

water.

Grease on contact surface between brake lining or
brake drum

Clear grease or replace brake lining.

Abnormal

braking

noise

Rivet extruded due to wear of brake lining

Replace brake lining.

Hardening or deterioration of brake lining surface

Replace brake lining.

Uneven wear or insecure installation of brake drum

Correct brake drum or tighten bolt.

Untight contact between brake shoe and brake lining

Replace rivet.

Looseness of brake shoe fixed pin

Tighten the lock screw of fixed pin.

Hub bearing wear

Replace hub bearing.

Deformation of brake drum

Replace brake drum.

Improper installation of brake shoe or damage of

return spring

Tighten fixed pin lock screw or replace return
spring.

Greasy or deteriorated brake lining

Clean or replace brake lining.

Damage of brake bottom plate

Replace brake bottom plate.

RAX

RAX

RAX

RAX Rear

Rear

Rear

Rear Axle

Axle

Axle

Axle

-141-

Removal/Installation

Removal/Installation

Removal/Installation

Removal/Installation

Rear

Rear

Rear

Rear axle

axle

axle

axle

Removal of rear axle
1.

Block the wheel front and back with anchor blocks.

2.

Loosen outside wheel nut.

3.

Jack up the rear axle.

Removal of axle shaft
1.

Loosen axle shaft nut.

2.

Remove axle shaft. If it is difficult to remove,
please use copper hammer to knock on the axle
shaft flange gently until it becomes loose.

Disassembly of wheel hub
1.

Remove lock washer.

2.

Remove hub bearing lock nut.

Attention:

Remove adjusting nut by using 7757 adjusting nut

wrench for hub bearing.

3.

Remove hub assembly.

Attention:

Attention:

Attention:

Attention:

Please apply the rear hub puller.

RAX

RAX

RAX

RAX Rear

Rear

Rear

Rear Axle

Axle

Axle

Axle

-142-

Removal/Installation

Removal/Installation

Removal/Installation

Removal/Installation (Continued)

(Continued)

(Continued)

(Continued)

Rear

Rear

Rear

Rear axle

axle

axle

axle

4.

Remove axle shaft oil seal from the end of axle
shaft sleeve.

Note:

Note:

Note:

Note:

During assembly, apply lithium base grease onto
the outer ring of axle shaft oil seal and then press it
into rear hub.

5.

Disassemble together with the inner ring of inner
bearing.

Note:

Note:

Note:

Note:

During assembly, oil seal bushing shall be pressed
into axle shaft sleeve by using special pressing die
after being heated.

6.

Remove oil seal from hub assembly.

7.

Remove outer ring of inner/outer bearing.

8.

Remove brake drum.