SANY SRT95C Off-Highway Truck. Service Manual

Nitrogen tyre inflation kit

warning

DO not use charging assembly for tyre

inflation because this assembly does not

include a pressure regulator, safety relief

valve, and adequate pressure gauging

which is mandatory for tyre inflation. Tyre

volume is as much as 90 times greater than

the average accumulator volume and it

takes very much longer to inflate a tyre - up

to 40 minutes or more for very large tyres.

Nitrogen gas cylinders used to inflate tyres

are generally charged to approximately

15.2Mpa. A tyre blowout or rim failure could

occur if inflation equipment is not properly

used. Proper nitrogen charging equipment

and personnel training can avoid over

inflation.

1. A nitrogen tyre inflation kit is available from

your dealer and consists of the following.
Refer to Fig.7.
a. Pressure regulator, 0 – 1.3 Mpa, with two
dual pressure gauges.
b. Safety relief valve, 0.86 Mpa, that will
assure an upper limit to the pressure available

for tyre inflation.

c . A 1 5 l e n g t h o f f l e x i b l e h o s e w i t h

interconnecting fittings. On the tyre end of the

hose is a large bore quick connect.
2. The pressure regulator is connected to a
nitrogen compressed gas cylinder available
from local suppliers.
3. The usual procedure for using this type of
equipment is as follows:

a. Connect nitrogen tyre inflation kit to nitrogen

compressed gas supply. DO not connect quick
connect to the tyre valve at this time.
b. Open valve on nitrogen supply.
c. With flexible hose and quick connect
connected to nitrogen tyre inflation kit

Front Wheel Assembly

assembly but not connected to the tyre, adjust
pressure regulator so that its output pressure
is not more than 0.14Mpa higher than the

desired tyre inflation pressure.

d. Connect quick connect to the tyre valve.
The tyre will now inflate. Tyre pressure can
be monitored by observing the gauge at the
pressure regulator.
e. When desired inflation pressure has been
achieved, back off the regulator or close the
valve on the compressed gas cylinder.
f. Remove the quick connect and adjust the
tyre pressure with the tyre gauge in the usual
manner.

Re-inflation of a mounted tyre

To re-inflate a tyre with dry nitrogen gas which
is now inflated with air, proceed as follows:
1. Deflate the tyre until the air in tyre reaches

the atmospheric pressure.
2. Re-inflate the tyre using only dry nitrogen
gas to 0.41Mpa gauge as a minimum, or to
bead-seating pressure as a maximum.
3. Adjust to the service inflation pressure
required:
a. If the required service inflation pressure is
less than 0.41Mpa remove the quick connect
and adjust the pressure with the tyre gauge in
the usual manner.
b. If the required service inflation pressure is
greater than 0.41Mpa, continue inflating with
dry nitrogen gas only, to the pressure level
required. Then remove the quick connect and
adjust the pressure with the tyre gauge in the
usual manner.

New tyre mounts and remounts

To newly mount or remount a tyre to rim,
use only dry nitrogen gas; this includes the
pressure required to seat the beads. After
seating the tyre beads, remove the quick
connect and adjust the pressure with the tyre
gauge in the usual manner.

Note

: Although a little more nitrogen gas is

Front Wheel Assembly

Fig.8 Typical Hydraulic Bead Breaking Tool

used to seat beads than that used for re-

inflation of a mounted tyre, its cost is generally

negligible in comparison to the time and labour
saving and, longer tyre life achievable with the
reduced oxygen content which results.

Hydraulic bead breaking tool

The hydraulic bead breaking tool illustrated
in Fig.8 is specifically designed to break tyre
beads on rusted rims, and is available from
your dealer. Refer to Special Tools. It can
be used on rims having pry bar slots. The
recommended procedure for using this tool is
described below.
1. Prepare for dismantling tyres according to
the necessary steps in the ‘Preparation for
servicing’ and ‘Dismantling tyre from Rim’.
2. Completely deflate tyre if not done
previously. See warning under 'Preparation for
servicing'. Tape valve threads to protect from
damage, leaving valve end open to avoid the
possibility of trapping air inside the tyre.
3. Place the lip of the hydraulic tool in one of

four breaking slots between the flange and the

bead seat band.
4. Adjust locking screw to a position which will
hold the tool in a line perpendicular to the face
of the rim.
5. Close valve on the hydraulic pump and
apply pressure to take up the slack in the
tool and rim parts. This will cause the tool to
tilt slightly downward. Release pressure and
adjust the screw again so that the tool will be
perpendicular to the rim when under pressure.

6. Apply enough pressure to move the flange

back approximately 13 mm (0.5 in) and hold
this distance by dropping a nut, or similar
object, in the space between the flange and
the bead seat band.
7. Release pressure and move the tool around
the rim in either direction. Insert lip of tool
between bead seat band and flange. Repeat
cycle until 3/4 of the rim circumference has

Front Wheel Assembly

been covered. Apply pressure at this point
until bead breaks loose.
8. Remove lock ring, bead seat band and
flange as described under 'Dismounting tyre
from rim'.
9. After lock ring, bead seat band and rim
flange have been removed, inner bead must
be broken loose according to Steps 3-7 for
breaking outer bead.

warning

Whenever a tyre is exposed to excessive

heat such as a truck fire or overheated

brakes the hazard of a subsequent violent

tyre explosion must be recognized. All

persons must avoid approaching the truck

so as not to be physically endangered in

the event of an explosion of the tyre and

rim parts. The truck should be moved to

a remote area, but only when this can be

done with complete safety to the operator

operating or towing the truck. All other

persons should stay clear of the truck.

The fire or overheated brakes, wheel, etc.

should be extinguished or cooled from a

safe distance. Do not attempt to extinguish

the fire or cool the machine by use of hand-

held fire extinguishers.

If it is absolutely necessary to approach a

truck with a suspect tyre, approach only

from the front or the back. Stay at least

15 m (50 ft) from the tread area. Keep

observers out of the area and at least 460

m (1 500 ft) from the tyre sidewall. Refer to

Fig.9. The tyre should be allowed at least

8 hours cooling time after the machine is

shut down or the fire extinguished before

approaching closer.

There is always a possibility of a tyre

explosion whenever the smell of burning

rubber or excessively hot brakes is

detected. The danger is also present when

a fire on the truck reaches the tyre and

At least 15m

At least 360m

Fig.9 Do Not Approach Tyre in Shaded Area

Front Wheel Assembly

wheel area. Under such conditions, all

personnel must avoid approaching the

truck in a manner that could result in injury

should an explosion actually occur. Move

the truck to a remote area only if it can be

done without endangering the operator or

other personnel in the area.

DO not weld on or heat rim components.

For several years the company and tyre

and rim manufacturers have warned

users never to weld rim components with

the tyre mounted on the rim. The gases

that build up inside the tyre during arc

welding or heating on rim components can

ignite, resulting in one of these explosive-

like failures of the tyre and rim. It is

recommended to scrap the part if heat is

necessary to repair any rim component.

Tyre maintenance

Tyre repairs

Prompt repair of tyre injuries will prevent small
injuries from enlarging and causing tyre failure.
Use the best tyre repair facilities available.
If good repair facilities are not available,
have the nearest dealer make the necessary
repairs.
Minor cuts, snags, or punctures should be
repaired upon discovery. Skive with a sharp
pointed knife around any cut in the tyre tread
area that is of sufficient depth or shape to
hold pebbles or dirt. The angle of the skive

should be no more than sufficient to expel all

foreign material and should extend no deeper
than the breaker. The skive should go to the
bottom of the hole. Tyres with shallow cuts, if
treated promptly, may be allowed to continue
in service. If the cut extends deeper into the
tyre carcass, the tyre should be removed for
repair. Ordinary tubeless tyre punctures can
be repaired without removing the tyre from
the rim. Use tyre repair plugs and follow the

Front Wheel Assembly

directions given by the manufacturer.
The tyre must be removed from the rim to
repair larger punctures or cuts. Irregular
shaped punctures or cuts less than 13 mm in
size can be repaired with a plug and hot patch.
Insert a repair plug into the hole to keep out
moisture and to back up the hot patch. Trim

the plug off flush with the inside of the casing,

buff, and apply the hot patch according to
the instructions supplied with the hot-patch
equipment.
Punctures 13 mm or larger, large cuts, or
bruise breaks require sectional or reinforced
vulcanized repair. Cover the repair patch with
a layer of cushion gum after application to the
tubeless tyre to ensure an airtight repair. Any
cords of the inside ply that are exposed in
bugging and are not covered with repair patch
must be coated with cushion gum to prevent
air leakage into the carcass plies on tubeless
tyres.

Recapping and retreading

There are two general methods employed in
restoring the tread surface of off-the-highway
tyres: recapping and retreading.
A recapped tyre has a new tread cured right
over the old tread surface.
A retreaded tyre has the old tread removed
entirely and a new tread cured directly onto
the body of the tyre. A tyre can be recapped
or retreaded if the cord body is free of cuts,
bruises and separation, and is thoroughly
sound, including previous repairs.

Tyre care

To obtain maximum service from off-the-
highway tyres, a few common-sense
precautions should be followed.

Maintain correct inflation

Most tyre damage are caused by improper

inflation. Both over-inflation and under-inflation

are detrimental to tyre life. Tyre pressure

Front Wheel Assembly

should be checked daily, preferably before
the truck is placed in operation, see the

instructions in 'Tyre Inflation Pressures'.

The valve cores should be checked for leaks.
Keep in mind that valve cores are delicate
mechanisms that wear out in service; therefore,
they should be replaced when they become
worn. Each tyre should be equipped with a
valve cap to prevent dirt from damaging the
valve core and causing air leakage.

Maintain good haul roads

Because haul roads are considered temporary
roads, they are frequently neglected. The
better the haul road, the longer the tyre and
machine life of off-the-highway equipment.

Note

: Although it takes time and effort to

maintain good haul roads, delay and cost of
tyre and machine breakdowns caused by poor
haul roads is many times greater.

Inspect tyres regularly

A  systematic  plan  for  tyre  inspection  will
more than pay for itself in lowered tyre costs
per  hour  of  operation. All  tyres  should  be
checked  regularly  for  cuts,  bruises,  fabric
breaks, excessive or uneven wear, embedded
foreign matter, and any other damage which
can be repaired. A considerable increase in
tyre service can be realized if tyre injuries
are repaired before they have progressed to
the irreparable stage. The rim mounting nuts
should be checked periodically and tightened
to the recommended torque.

Prevent overloading

Off-the-highway trucks are designed to carry a
maximum allowable payload.

Note

: Excessive loading will overstress both

the machine and tyres and shorten the life of
both.

Prevent tyre contact with oil

Prevent tyre contact with petroleum products.

Front Wheel Assembly

Rubber that is exposed to oil, petrol, or grease
becomes soft and spongy and deteriorates
rapidly. Always avoid driving truck equipped
with rubber tyres through a puddle of petrol,
fuel oil, lubricating oil, or grease. Never let a
tyre stand in oil or grease spot overnight.

Store tyres properly

The best of care given to tyres in service by
operators and maintenance personnel can
be completely nullified by careless storage.
Time is not the only contributing factor to the
deterioration of rubber products. Therefore,
tyres that are to be stored must be protected
from light, heat, oils, dirt, moisture and ozone.
Stored tyres should be carefully covered with a
tarpaulin or some other suitable material, such
as opaque plastic sheets, to prevent contact
with the contaminants listed.

Proper handling of tubeless tyres and rims

Tubeless tyres should be stored vertically.
Horizontal stacking may compress the tyre
walls  making  inflation  difficult.  If  tyres  are
stored in racks, the lower supporting members
should provide as broad a surface as possible
to the tyre tread to avoid a concentration of
load.
The beads of tubeless tyres must be protected
from damage or a faulty air seal will result. Do
not use hooks, cables, or chains in contact
with the tyre beads when lifting these tyres.
If forklift trucks are used for handling, they
should be equipped with broad, well rounded
arms  to  distribute  the  load  and  prevent
damage to the tyre bead. When handle tyres
with  the  fork  truck,  do  not  scrape  the  fork
across the bead.
Tubeless  tyre  rims  perform  an  important
function  as  part  of  the  assembly  air  seal.
Proper care therefore must be taken not to
distort or mutilate the rim parts, because they
must mate properly to form part of the basic air
chamber. Since the rim base, bead seat band,

Front Wheel Assembly

and flange are endless, distortion may prevent

easy assembly as well as possibly resulting in
no seal.
Never drop, tumble, or roll rim parts.
If rim parts are stored outdoors they should be
given a protective coat of a good commercial
primer.
Similar parts should be stacked neatly to
prevent distortion.
Babbitt or lead hammers, not sledge hammers,
should be used in assembling rims.
'O' rings are seals and should be carefully
stored in a cool, dry place where they will not
be damaged.
Valve cores also should be stored in a cool,
dry and clean place.

Special tools

Refer to Section 38.3, SERVICE TOOLS, for
part numbers of special tools outlined in this
section and general service tools required.
These tools are available from your dealer.

Tyre inflation pressures

E3 tyres may be so roaded up to 48 km/h (30
mile/h), maximum, with a 30 minute cooling
stop after each 80 km (50 miles) or 2 hours
sustained operation - whichever occurs first
-  and  a  60  minute  cooling  stop  after  each
aggregate of 4 hours of operation.
E4 tyres may be so roaded up to 32 km/h (20
mile/h), maximum, with a 30 minute cooling
stop after each 32 km (20 miles) or 1 hour of
sustained operation - whichever occurs first
-  and  a  60  minute  cooling  stop  after  each
aggregate of 4 hours of operation.
Normal  inflation  pressure  of  bias  tyres
(27.00-49 48PR) is 0.575 Mpa. Specific job
conditions, terrain, haul road maintenance
and length, maximum and workday average
speed, job t-km/h (ton-mile/h) required and
tyre t-km/h (ton-mile/h) capacity, etc., may
require an increase in inflation pressure. It is
recommended that for tyres both listed and

Front Wheel Assembly

Front Wheel Assembly

unlisted the user consult the tyre manufacturer
and evaluate all job conditions in order to
make the proper selection.

Technical conditions of special torque

Fig.

NO.

Item

NO.

Item Name

Torque

N•m

lbf•ft

Nut

1000-1300 510

Tubeless Tyre Leak Diagnosis

Occasionally a tubeless off highway tyre/rim assembly may leak in field service. To determine cause of

leakage, the entire assembly including valve hardware, multi-piece rim assembly, 'O' ring and tyre should
be checked using a soap solution.
This table lists various causes of air loss and possible remedy.

Causes

Remedy

Defective valve

Tighten and replace suspicious parts and use
valve core cap.

Cracked rim or weld

Replace defective parts.

Warning

Do not repair rim parts (including welding and etc.).

Twisted or damaged 'O' ring

Replace O-ring (Perform lubrication).

Tyre cuts and snags

Repair damaged tyre.

Bead area awl holes

Repair internal lining (It should be performed in
priority).

Leakage between tyre bead trim

With tyre removed from rim:
Clean tyre beads in rim contact area
Clean rim with wire brush
Inspect 5°tapered bead seat band and the rim
base in the bead seating area to determine if the

transverse weld trims are flat or concave.

Replace defective part.
Weld trim should follow rim contour.

Mount tyre using a lubricant such as Murphy's Tyre
and tube Mounting Compound, or equivalent, on
tyre beads and rim bead seat area.

2 FRONT AXLE ASSEMBLY

Fig.1

1. Right front axle assembly

6. Washer

2. Steering mechanism

7. Brace piece axial pin

3. Left front axle assembly

8. Brace piece axial pin

4. Bolt

9. Separating sleeve

5. Washer

10. Brace piece axial pin

Front Axle Assembly

Overview and operating principle

The front axle that it is very important part for
vehicle which used to carrying, it connecting
with frame via the front suspension cylinders,
A-shape arm and steering crank. Its major
task is to transmit all the forces and moments
acting between the wheels and the frame,
alleviate the shock load transferred form road
surface to the frame,attenuate consequent
vibration of the carrying system and ensure
the running smoothness of the truck.It ensures
the ideal motion characteristics of wheels
in case of rough road surface and variable
load,and ensures the manipulation stability of
the truck. At the same time, it can utilize the

steering mechanism to deflect the wheels to a

certain angle so as to realize turning.

warning

The cylinder has fully pressure inside.

Before valve or joint is opened, pressure

should be released according to the

instructions in the section of ‘Releasing

Suspension Cylinder Pressure’. If it is

released suddenly, it will lead to personal

injuries and equipment damages.

Disassembly

See Fig.1 for the numbers in brackets.
1. Place the truck in a level work area. The
wheels must be chocked to ensure that the
truck will not slide. If it cannot,keep the truck
in the parking situation and shut down the
engine.
2. The steering wheel turns for several circles
in the two directions to release the steering
system pressure. Chock the wheels and set
the main switch of battery into the "OFF"
position.
3. Refer to the part of "Releasing the Pressure
of Suspension Cylinder"in this chapter,and

Front Axle Assembly

release nitrogen pressure in the suspension
cylinders of the left and right front axle(1)(3).
4. Remove the connneting pin between the
steering mechanism(2)and the left/right fornt
axle(1)(3) to separate the steering mechanism
from the left and right front axles.
5. Remove the brace piece axial pin(7)(8)(10)
for the left and right front axles. As the same
time remove the separating sleeve(9).Use a
fork truck or crane to move them away.

warning

To prevent personal injury and property

loss,ensure that wheel chocks and hoist

device have sufficient capability and are

correctly fixed to ensure safe work.

Inspection

1. Clean all connecting parts and holes
with a proper solvent and dry them with air-
compress. Check whether the articulating
hole bearing rotates normally and whether the
spacer ring and pin spindle are worn. If they
are worn, replace them with new ones.

Installation

1. Removes all of dirt things from the frame
and connecting holes of the frame and makes
them clean.
2.Lift and insert the left and right front axles
in position.Use the pin(7)to install the upper
articulating points for the front suspension of
the left and right front axles into the mounting
hole of ring beam.Install the A-arm articulating
hole onto the beam lower articulating point and
the front longitudinal beam articulating point of
frame via pin(8)(10)and the sleeve(9).
3. Connect the steering cylinder and steering
tie rod of steering mechanism(2)to the steering
arm assembly of left and right front axles(1)(3)
through pin.
4. According to the requirements for front

Front Axle Assembly

2.1. Front Axle Assembly

Fig.2

1. Front suspension cylinder

11.Bolt

2. Front brake and installation

12.Steering arm baffle

3. Installation of front hub

13.Washer

4. Steering arm assembly

14.Bolt

5. Washer

15.Steel wire

6. Bolt

16.Retainer ring

7. Left A-arm

17.Bearing

8. Bearing

18.Oil fitting

9. A-arm baffle

19.Bolt

10.Washer

20.Step assembly

Front Axle Assembly

Overview and operating principle

See Fig.2 for the numbers in brackets.
The left front axle (also applicable to the right
front axle) is a critical component of front axle,
bearing the shock transmitted from the frame
to the left part of front axle and attenuating the
vibration.It provides braking force to the front
axle. The left front axle can be divided into left
suspension cylinder, left steering arm, front
brake, hub and left/right A-arm for installation.

Disassembly

See Fig.2 for the numbers in brackets.
1.Place the left front axle levelly,remove the
anti-loosening steel wire

（

）、

Bolt

（

）

and washer

（

）

.Remove Steering arm

baffle

（

）

.Disengage left A-shape arm

（

）

form the lower shaft of steering arm assembly

（

）

2. After removed Bolt

（

）、

washer

（

）

demolition A-shape arm baffle

（

）

, knock out

bearing

（

）

of left A-shape arm

（

）

.After

removed retainer ring

（

）

with pliers,knock

out bearing

（

）

of left A-shape arm

（

）

3.Open the cover of the front hub,remove
pressure plate form front axle of front
suspension cylinder

（

）

, pull down front hub

（

）

4.Removed the screws of front brake and pull
down the fornt brake(2).
5.Removed the screws of bolt

（

）、

washers

（

）

and separate steering arm assembly

（

）

from the front suspension cylinder

（

）

Inspection

1.According to Section 2.1.1"FORNT WHEEL
AND INSTALLATION",check the parts and
components in the front hub and its installation
for damages.
2.According to Section 2.1.2"FRONT BRAKE
ASSEMBLY AND INSTALLATION",check the
parts and components in the front brake and
its installation for damages.
3. According to Section 2.1.4 'FRONT

Front Axle Assembly

SANY SRT95C Off-Highway Truck. Service Manual - page 3