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