Zoomlion QY30V, Manual

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09 - 10 09 - 10
Air enters in. Air enters in.
parts for parts for
tightness.
tightness.
Steering is Steering is
sometimes hard
sometimes hard
or sometimes
or sometimes
uncontrolled
uncontrolled
Floating brass bush of steering pump is blocked Floating brass bush of steering pump is blocked
and does not contact with wheel end-face tightly
and does not contact with wheel end-face tightly
all the time.
all the time.
Rectify oil pump. Rectify oil pump.
Sealing Sealing ring ring of of piston piston in in steering steering gear gear is is polluted. polluted. Clean Clean it. it.
D i a g n o s t i c s D i a g n o s t i c s
Problem Causes Remedy Problem Causes Remedy
Thrust bearing ring in screw rod of steering gear Thrust bearing ring in screw rod of steering gear
damaged. damaged.
Replace bearing. Replace bearing.
Hydraulic oil level is too low Hydraulic oil level is too low or is polluted or air or is polluted or air
enters into the system. enters into the system.
Add oil, change Add oil, change
oil or deaerate. oil or deaerate.
Bearing Bearing of of knuckle knuckle spindle spindle damaged. damaged. Replace Replace bearing. bearing.
Left steering is Left steering is
uncontrolled
uncontrolled
while right
while right
steering is hard,
steering is hard,
and vice versa
and vice versa
Oil leakage occurred in the two sides of piston in Oil leakage occurred in the two sides of piston in
steering gear are not the same.
steering gear are not the same.
Replace seal Replace seal
ring.
ring.
Air enters into one of the chambers. Air enters into one of the chambers. Deaerate Deaerate
Mounting screws in steering gear and power Mounting screws in steering gear and power
cylinder bracket loose. cylinder bracket loose.
Check and Check and
tighten the tighten the
screws. screws.
Clearance between ball head pins of drive rod is Clearance between ball head pins of drive rod is
too large. too large.
Check or replace Check or replace
The vehicle The vehicle
cannot drive in a
cannot drive in a
straight line
straight line
Tire pressure of left / right steering wheel does Tire pressure of left / right steering wheel does not not
meet the specified one. meet the specified one.
Check and inflate Check and inflate
to specified to specified
pressure. pressure.
One of the steering wheels is in brake state for a One of the steering wheels is in brake state for a
long time. long time.
Adjust or rectify Adjust or rectify
brakes. brakes.
The clearance of left / right steering wheel are not The clearance of left / right steering wheel are not
same (one is too loose while the other is too tight same (one is too loose while the other is too tight
or blocked). or blocked).
Adjust bearing Adjust bearing
clearance or clearance or
replace bearing. replace bearing.
Air enters into oil and direction is not stable. Air enters into oil and direction is not stable.
Check and Check and
eliminate. eliminate.
Steering Steering wheels wheels uneven uneven wear. wear. Tire Tire rotation. rotation.
Steering axles are blocked. Steering axles are blocked.
Check the Check the
blocked parts.
blocked parts.
Check whether
Check whether
input shaft is
input shaft is
blocked by radial
blocked by radial
resistant force.
resistant force.
Vehicle axles are not properly seated, such as Vehicle axles are not properly seated, such as
steering axles do not aligned with the intermediate steering axles do not aligned with the intermediate
/ rear axles or improperly seated. / rear axles or improperly seated.
Check and Check and
adjust. adjust.
Steering drive rod is improper adjusted or has Steering drive rod is improper adjusted or has
reached wear limit. reached wear limit.
Adjust clearance Adjust clearance
or replace rods. or replace rods.
L th L th