Dongfeng DFA1101GZ5AD6J-907. Instruction - page 43

Steering System

ST-6

Steering Gear

Basic parameter

Maintenance

1.After 2,500km, the new power steering gear need to replace its hydraulic pressure oil, and wash the filter in the

oil reservoir. Replace the hydraulic pressure oil and wash the filter ever 50,000km or every year after that.

2.Check the oil quantity every month to see whether it reduced, deteriorated or too much impurities. If there is any

badness, you have to refill or replace the oil immediately.

3.Check and keep the tire pressure accord with the requirement.

4.Procedure of replace or fill oil

(1)Support the front axle.

(2)Open the oil reservoir, screw down the oil outer bolt of the steering gear, drain off the remain oil in the oil

pump and the oil reservoir(idle the engine), and turn the steering wheel left and right to the limit for several times,
till there is not oil flowing out.

(3)Tighten the oil outer bolt (keep it clean and avoid dirt entered)

(4)Fill with new hydraulic pressure oil.

(5)Idle the engine, turn the steering wheel left and right to its limit for several times until there is no bubbles

appeared in the oil reservoir and the oil level stop dropping.

(6)Refill the oil reservoir to its maximum.

(7)Tighten the upper cover of the oil reservoir.

Basic parameter

M11-3411010

Appropriate maximum load of front axle (kg)

3500

Max. output torque (N.m)

2150

Max. oil pressure (MPa)

13

Recommended oil pump flow (L/min)

10

Drive ratio

18:1

Number of total turns

4.78

Pitman arm shaft turning angle

±

45°

Temperature range (°C)

-40~120

Diameter of the piston (mm)

80

Steering System

ST-7

Trouble Analysis

Trouble

Cause

Method

Bothway heavey steer-

ing

1.Oil level in steering gear is not suffi-
cient

Add oil to the upper mark

2..The connecting part between the oil
outlet and the engine, and between the oil
inlet of the steering oil pump and the
engine, and between the oil pump and the
engine sucked air.

Tighten oil pipe fitting or replace the seal-
ing part

3.Too small flow of the steering oil pump
(flow control valve blocked)

Disassemble and wash the flow control
vavle

4.Strainer screen of the oil reservoir
damaged or blocked

Replace the filter cartridge and wash the
oil suction pipeline between oil reservoir
and oil pump

5.The movement between steering drive
shaft and universal joint connecting with
the steering gear is not flexible.

Move repeatedly until it becomes flexible,
otherwise you have to replace the univer-
sal joint

6.Rotary valve blocked

Repair the steering gear

7.Improper oil pressure in the oil pump

Replace oil pump

8.Vehicle overload too much

Reduce load

One-way heavey steer-

ing

1.Tire pressure of one side isn't enough.

Inflating

2.Only one direction of the steering gear
leak out too much.

Repair the steering gear

3.The rotary valve isn't in the nuetral
position.
4.The fixed pressure of left or right can,t
be set up.

Replace sealing part

Heavey steering when

quickly turning bothway

1.The connecting part between the oil
outlet of the steering oil reservoir and the
engine, and between the oil inlet of the
steering oil pump and the engine sucked
air.
2.Too small flow capacity of the steering
oil pump

Replace the steering oil pump

Too large free travel of

the steering wheel

1.Steering wheel and steering shaft fit is
loose

Tighten

2.Connecting part of the steering drive
device loosed
3.Fixed bolt of the steering gear and its
bracket loosed
4.Too big clearance between steering
screw arbor and nut

Repair the steering gear

5.Leaf spring bolt loosed

Tighten

6.Steering universal joint locking bolt
loosed

Tighten

7.Improper adjustment of the steering
gear

Adjust side cover adjusting bolt

Steering System

ST-8

Steering gear overheat

(its temperature is over

65°C of the environ-

ment temperature)

1.Too much flow of the oil pump

Replace the oil pump

2.The bending radius of the oil pipe is
too small or the inner part is blocked and
cause oil flowing difficult and heated

Replace the oil pump

3.Steering to the limit position need more
than 5 seconds.

Avoid to turn to the limited position

Steering control is not

flexible

1.Parts of steering system loose or wear

Tighten or replace

2.Steering gear is loose

Tighten

3.Improper adjusting of the steering gear Adjust the side cover bolt
4.Oil level of the oil reservoir is lower
than the lowest mark

Add oil

5.Front axle leaf spring fixed bolt loosed Tighten
6.Steering universal joint locking bolt
loosed

Tighten

Steering wheel return

failed

1.Insufficient tyre pressure

Inflating

2.Too tight fit of the front axle parts

Adjust

3.Improper alignment of the front wheel

Steering wheel return

too quick

1.Insufficient oil in the steering oil reser-
voir

Add oil

2.Air in the steering oil pipe

Exhaust

3.Clearance between steering drive shaft
and the steering universal joint

Replace the steering universal joint

4.The input torque of the steering gear
when idling is smaller than 40~60N.cm
that the mesh of the nut and arm shaft
loosed.

Adjust clearance

Front Axle

FA

Table of Contents

Structure.......................................................................................................... FA-1
Disassembly of the Front brake ...................................................................... FA-2
Maintenance.................................................................................................... FA-3
Assembly and Adjustment.............................................................................. FA-4
Trouble Analysis............................................................................................. FA-5
Appendix 1 Lubricanting Parts and Lubricant .............................................. FA-7
Appendix 2 Tighten Torque of the Bolts and Nuts........................................ FA-7
Appendix 3 Main Adjusting Data and Maintaining Standard ....................... FA-8

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