SANY Crawler Hydraulic Excavator SY365H-9, SY365BH-9. Shop Manual (2014)

6-18

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.5.2 Adjusting

1. Align the timing pointer with the specific

mark on the crankshaft pulley.

2. Perform step 3 through step 6 described

in the testing procedure.

3. Loosen the four (4) nuts on the fuel injec-

tion pump.

4. Injection timing turns the fuel injection

pump in advance along the drive shaft of
fuel injection pump in order to make it face
outward (getting away from the cylinder
block).

Injection timing turns the fuel injection pump
in retard along the drive shaft of fuel injec-
tion pump in order to make it face inward
(approaching the cylinder block).

Ref: 1 mm difference between the two
marking lines approximates 2º of crankshaft
angle.

5. Keep operating the hand pump to transfer

the fuel while slowly turning the fuel injec-
tion pump. Stop turning the injection pump
when no oil is seen coming out of the
fuel delivery valve body of No.1 cylinder.
Adjustment of fuel injection pump position
is now

nished.

6. Tighten the four (4) nuts of fuel injection

pump.

7. Remove again the fuel delivery valve body

and assemble the spool, spring and seat.
Tighten the valve assembly to the speci

torque.

8. Install the injection tube of No.1 cylinder

and tighten it to the speci

c torque.

ZX335-1004019

Loosen the nuts.
(Also loosen the nuts on the back.)

ZX335-1004010

Pressure gauge connector

Fig. 6-18

Fig. 6-19

6-19

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.6 A/C Compressor Belt Tension - Test and Adjust

ZX335-1004021

Compressor belt pulley

Drive belt pulley

ZXT335-1004022

6.6.1 Testing

Press the intermediate point of the belt be-
tween the drive pulley and the compressor belt
pulley with a finger force of about 58.8 N

(

kgf

)

, and check the de

ection (A) of the belt,

which shall be 5

8 mm (0.20 in

0.31 in).

6.6.2 Adjusting

●

If the belt de

ection is abnormal, adjust it

according to the following procedure.

1. Loosen the bolts (1) and (2).

2. Move the compressor (3) and the bracket

(4) together to adjust belt tension.

3. After positioning the compressor (3),

tighten the bolts (1) and (2).

4. Recheck belt tension after adjustment.

Fig. 6-20

Fig. 6-21

Note:

●

Check each belt for damage. Check the
V-groove and the V-belt for wear. In addi-
tion, it is especially important to keep the
V-belt free from friction with bottom of the
V-groove.

●

Contact local Sany dealer and replace the
belt in case of the following conditions.

●

The fan belt has been stretched and
little margin is left for adjustment.

●

Cuts or cracks are found in the belt.

●

Abnormal sliding or noise.

●

When a new belt is mounted, readjust the
belt tension after one hour operation.

6-20

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.7 Swing Bearing Clearance - Test

ZX335-1004023

ZX335-1004024

●

Tool used for testing swing bearing clear-
ance

Symbol

Part Number

Part Name

H 60033930

Dial

gauge

●

The following steps are to be followed
when testing the clearance of swing bear-
ing.

1. Fix the dial gauge (H) to the track frame

and make the pointer point the lower end
of the outer race.

Place the work equipment to the maximum
reach position. Raise the bucket to a
height that the bucket tips and the swing
frame bottom are on the same level.

At the moment, the front of upper structure
lowers while the rear rises.

3. Reset the dial gauge (H) to zero.

4. Set the arm almost perpendicular to the

ground and lower the boom until the front
track shoe tilts.

At the moment, the front of upper structure
rises while the rear lowers.

5. Read the dial gauge (H).

The value indicated by the dial gauge (H)
is the clearance of the bearing.

6. Restore the machine to the condition of

step 2. Check the dial gauge (H) to see if it
reads zero.

Repeat step 3 through step 5 if the dial
gauge (H) reads a value other than zero.

150

200mm

ZX335-1004025

WARNING

●

Park your machine on a level ground.
Lower your work equipment to the
ground.

●

Do not put your hands or feet under the
undercarriage during testing.

Fig. 6-22

Fig. 6-23

Fig. 6-24

6-21

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.8 Track Tensioner - Test and Adjust

6.8.1 Testing

1. Move your machine forward at a distance

that is equal to the length of track on the
ground. Keep running the engine at low
idle. Park your machine slowly.

2. Place a straight edge on top of the track

grousers between the idler (1) and the
front carrier roller (2).

A straight edge of angle steel is recom-
mended for this purpose as angle steel
bends little. In addition, an L-shaped beam
has good performance against bending.

3. Measure the maximum clearance (a)

between the upper surface of track and the
bottom of straight edge.

Max clearance (a): 10~30 mm(0.4~1.2 in)

ZX335-1004026

Fig. 6-25

6-22

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

ZXT335-1004027

6.8.2 Adjusting

If the track tension is incorrect, adjustment is
to be made in the following way.

1. Decreasing the tension

A. Loosen the valve (1) to discharge

grease. Tighten the valve after dis-
charging.

●

Add grease until the gap (b) between
the idler guide and the track frame end
becomes zero. If the tension is till low, it
indicates that the pins and bushings are
seriously worn. Replace the pins and
bushings, or remove one track shoe.

WARNING

●

Never loosen the valve over one turn.
If the valve is loosened too much, the
grease under high pressure may cause
the valve to shoot.

B. Recheck the track tension as per the

above method after adjustment.

2. Increasing the tension

A. Add grease through the grease fitting

(2) with a grease gun.

B. Recheck the track tension as per the

above method after adjustment.

ZX335-1004028

Fig. 6-26

6-23

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.9 Oil in Hydraulic Circuits - Test and Adjust

Tools used for testing and adjusting hydraulic
pressure in work equipment, swing and travel
circuits

Part Number

Part Name

—

60038932

Hydraulic Tester

B210770000084

Adaptor

●

The hydraulic pressure in work equipment,
swing and travel (hydraulic pump output
pressure) circuits can be viewed on the
monitor.

6.9.1 Testing

1. Preparatory work before measuring

Lower the work equipment to the ground
and stop the engine. After the engine is
stopped, operate the control levers for sev-
eral times in order to release the remaining
pressure in hydraulic circuits. Open the
butterfly nut on the breather valve. Press
the relief button to release pressure in the
hydraulic tank.

ZXT335-1004029

A. Remove the plug (1) and plug (2) for

testing the hydraulic pressure.

Plug (1): For oil circuit of back hydraulic
pump

Plug (2): For oil circuit of front hydraulic
pump

B. Install the priming adaptor and connect

it to the hydraulic tester.

Use an oil pressure gauge with a ca-
pacity of 40 MPa {408 kg/cm

C. Start the engine and keep it running

until the hydraulic pressure rises to a
point within the operational range.

Fig. 6-27

6-24

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

2. Testing the unloading pressure

A. Start the engine.

B. Test the hydraulic pressure when the engine is running at high idle and all control levers

are in neutral position.

The hydraulic pressure indicated is the pressure when the unloading valve unloads.

3. Testing the relief pressure of work equipment

A. Start the engine and move the cylinder to be measured to its stroke end.

B. Test the hydraulic pressure when the engine is running at high idle and the cylinder is in

relief condition.

The hydraulic pressure indicated is the pressure when the main relief valve is in relief con-
dition.

4. Testing the swing relief pressure

A. Start the engine. Reach out the work equipment as far as possible. Lower the work equip-

ment on the ground in order to restrict swinging.

B. Test the hydraulic pressure when the engine is running at high idle and the swing circuit is

in relief condition.

The hydraulic pressure indicated is the pressure when the swing motor relief valve is in re-
lief condition.

The relief pressure of swing motor is lower than the main relief pressure.

5. Testing the relief pressure of travel circuit

A. Start the engine and lock the travel

mechanism.

Place the pin

①

between the sprocket

and the track frame in order to block
the travel mechanism.

B. Test the hydraulic pressure when the

engine is running at high idle and the
travel circuit is in relief condition.

The hydraulic pressure indicated is the
pressure when the main relief valve is
in relief condition. When the travel cir-
cuit is in relief condition, the pressure
indicated is always the pressure at high
relief.

ZXT335-1004031

Fig. 6-28

6-25

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.9.2 Adjusting

1. Adjusting the main relief pressure (at the

high pressure setting side)

The unloading valve and safety valve for the
boom are not adjustable.

If the high relief pressure in work equip-
ment and travel circuits is abnormal, adjust
the high pressure setting side of the main
relief valve (3) according to the following
procedure.

ZXT335-1004900

Fig. 6-29

Fig. 6-30

A. Disconnect the pilot hose.

B. Loosen the locknut (4). Turn the adjust-

ing screw (5) to adjust the pressure.

The pressure increases as the retainer
is turned right.

The pressure decreases as the retainer
is turned left.

Each turn of the retainer approximates:
12.5 MPa {128 kg/cm

}

Locknut:

53.5

4.9 Nm{5.5

0.5 kgm}

C. Check the pressure again after adjust-

ment. Test the pressure according to
the procedure described above.

Connect the pilot hose before testing
the pressure.

Adjustment of the high pressure setting
side will affect the low pressure setting
side. The low pressure setting side is,
therefore, to be adjusted too.

ZX335-1004033

6-27

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

2. Adjusting the swing relief pressure

If the swing relief pressure is abnormal,
adjust the swing motor relief valve (6) ac-
cording to the following procedure.

ZXT335-1004034

A. Loosen the locknut (7). Turn the adjust-

ing screw (8) to adjust the pressure.

Pressure increases as the retainer is
turned right. The pressure decreases
as the retainer is turned left.

Each turn of the retainer approximates:
6.71 MPa { 68.4 kg/cm

}

Locknut:

103 Nm{8.0

10.5 kgm}

B. Check the pressure again after adjust-

ment. Test the pressure according to
the procedure described above.

ZX335-1004035

Fig. 6-31

Fig. 6-32

6-28

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.10 Control Oil Circuit Pressure - Test and Adjust

6.10.1 Testing

Tools used for testing and adjusting the pressure in control oil circuit.

Part Number

Part Name

—

21008760

Hydraulic Tester

B210770000084

Adaptor

Lower the work equipment to the ground and stop the engine. After the engine is stopped, oper-
ate the control levers for several times in order to release the remaining pressure in hydraulic cir-
cuits. Open the butter

y nut on the breather valve. Press the relief button to release pressure in

the hydraulic tank.

1. Remove the hydraulic pressure testing

plug (1).

2. Install the priming adaptor and connect it

to the hydraulic tester.

●

Use an oil pressure gauge with a capacity
of 6 MPa {61 kg/cm

}

3. Start the engine and keep it running until

the hydraulic pressure rises to the opera-
tional range.

4. Test the oil pressure with the engine run-

ning at high idle and all control levers in
neutral position.

ZXT215-1004007

Fig. 6-33

Fig. 6-34

ZX215-1004031

6.10.2 Adjusting

If the oil pressure measured is lower than
3.5 MPa {36 kgf/cm²}, loosen the locknut (2)
and screw in the stud (3). Observe pressure
change on the gauge at the same time.
Tighten the nut (2) when desired pressure is
reached.

Remove all measuring tools after testing.
Make sure that the

6-29

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.11 Solenoid Valve Output Pressure - Test

Tools used for testing the output pressure of solenoid valve

●

Make sure that the initial pressure of control oil circuit is normal before testing the output
pressure of solenoid valve.

y nut on the breather valve. Press the relief button to release pressure in

the hydraulic tank.

Part Number

Part Name

—

21008760

Hydraulic Tester

B210770000084

Adaptor

1. Disconnect the hose of solenoid valve in

order to test the pressure at the outlet.

W365613091

No.

Solenoid valve to be tested

High travel speed valve

Backup proportional valve

Bucket con

uence valve

Backup

Pilot pressure valve

Install a tee to location (A) on each solenoid valve and connect the hose.

3. Mount the adaptor onto the tee and connect it to the hydraulic tester.

●

Use a hydraulic tester with a capacity of 6 MPa {61 kg/cm

} .

4. Start the engine and keep it running until the hydraulic oil temperature rises to the operational

range.

5. Run the engine at full speed. Operate the control levers to open or close each solenoid valve,

and measure the pressure.

●

The function of each solenoid valve can be checked through the monitor's monitoring func-
tion. (This is a special function of the monitor.)

6. Remove all measuring tools after measurement. Make sure that the machine returns to its

normal condition.

Fig. 6-35

6-30

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

Pilot locking solenoid valve

Functioning state

Function

Hydraulic lockout control

Lock

OFF

Free

Travel speed shift solenoid valve

Functioning State

Function

When the 2nd level overheat setting is on

OFF

Fuel control dial reads lower than 1500 rpm.

When travel speed switch is in Lo position

When travel speed
switch is in Hi posi-
tion

Travel signal OFF

Travel signal ON

If pressure of both front and back pump is
24.5 MPa {250 kg/cm2}

If pressure of both front and back pump is
15.3 MPa {150 kg/cm2}

Other states

6-31

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.12 Pilot Valve Output Pressure - Test

●

Tools used for testing the output pressure of pilot valve

●

Make sure that the initial pressure of con-
trol oil circuit is normal before testing the
output pressure of pilot valve.

Part Number

Part Name

—

21008760

Hydraulic Tester

B210770000084

Adaptor

1. Remove the pilot oil pressure switch or

plug.

2. Install the adaptor and connect it to the hydraulic tester.

●

Use a hydraulic tester with a capacity of 6 MPa{61 kg/cm

3. Start the engine and keep it running until the hydraulic oil temperature rises to the operational

range.

4. Measure the output pressure with the engine running at high idle and all control levers of the

tested circuit in neutral position.

●

When the measured output pressure reads the following values, the pilot valve is normal.

5. Remove all the tools after testing. Make sure that the machine returns to its normal condition.

ZXT335-1004902

7 8

No.

Oil circuit

No.

Oil circuit

Left travel

Boom DOWN

Right travel

Left swing

Arm IN

Bucket DIG

Right swing

Arm OUT

Bucket DUMP

Boom UP

Control lever

Hydraulic pressure

Neutral position

0{0}

Full stroke

Close to the average initial pres-

sure of oil control circuit

(See Table of Standard Values)

6-33

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.13 Work Equipment and Swing Pilot Valves - Adjust

●

If the play of work equipment or swing
control lever is too big, adjustment can be
made through the following steps.

1. Remove the work equipment and swing

pilot valve assembly.

2. Remove the bellows (1).

3. Loosen the locknut (2). Screw on the disc

(3) until it contacts with the four heads of
plunger (4).

●

Do not move the plunger.

4. When the disc (3) is fixed, tighten the

locknut (2) to the speci

ed torque.

Locknut: 98

127 Nm {10

13 kgm}

5. Restore the bellows (1).

6. Restore the work equipment and swing

pilot valve assembly.

ZX215-1004032

6-34

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

6.14 Hydraulic Drift of Work Equipment - Test

●

If hydraulic drift occurs to the work equip-
ment (cylinder), check it according to the
following procedure. It is to determine
whether the failure is caused by cylinder
seal or control valve.

1. Check the boom and bucket cylinders.

A. Park your machine in an attitude as

shown in the illustration on the right,
and stop the engine.

●

Load the bucket fully with soil or apply
rated load to the bucket.

B. Operate the control levers in order to

keep the boom in the UP position and
the bucket in the DIG position.

●

If the lowering speed increases, it is
failure of cylinder seal.

●

If nothing changes, it is failure of con-
trol valve.

●

Operate the control levers with engine
start switch in the ON position.

●

If the pressure in accumulator drops,
recharge the accumulator after running
the engine for about 10 seconds.

2. Check the arm cylinder.

A. Park your machine in an attitude as

shown in the illustration on the right.
The distance between the arm cylinder
and the digging stroke end is 100 mm.
Stop the engine.

B. Operate the control levers in order to

place the arm in the DIG position.

●

If the lowering speed increases, it is the
failure of cylinder seal.

●

If nothing changes, it is the failure of
control valve.

●

Operate the control levers with engine
start switch in the ON position.

ZX215-1004033

ZX215-1004034

6-35

Testing and Adjusting

SY365(B)H-9 Crawler Hydraulic Excavator

●

If the pressure in accumulator drops, recharge the accumulator after running the engine
for about 10 seconds.

[Ref.] If the hydraulic drift is caused by failure of the cylinder seal, the reason for increase of low-

ering speed during the above operation is described below:

A. If the machine is set in the above position (where the holding pressure is applied to the head

end), the oil leaks from the head end to the rod end. The pressure in the rod end is increased
as a result.

B. As the pressure in the rod end decreases, the pressure in the head end increases to keep a

balance. This process is repeated until balance is reached at a certain level depending on the
amount of leakage.

C. When the pressure is balanced, the lowering speed decreases. If the control levers are oper-

ated according to the above procedure, the oil circuit in the rod end opens to the drain circuit
(while the head end is closed by a check valve), and the oil

ows to the drain circuit from the

rod end. As a result, the lowering speed increases.

3. Check the pilot valve.

Test the hydraulic drift respectively while the accumulator is pressurized and the hydraulic
lockout control in the LOCK/FREE position.

●

Operate the control levers with engine start switch in the ON position.

●

If the pressure in accumulator drops, recharge the accumulator after running the engine for
about 10 seconds.

●

If there is a difference in hydraulic drift between the LOCK position and the FREE position, it
is the failure (internal fault) of the pilot valve.

SANY Crawler Hydraulic Excavator SY365H-9, SY365BH-9. Shop Manual (2014) - page 21