SANY Crawler Hydraulic Excavator SY215CLC (CUMMINS QSB6.7 engine). Shop Manual

Testing and Adjusting

SY215C

6-10

6.5 Swing Bearing Clearance - Measure

★

Measuring tool

Symbol

Part Number

Part Name

H 60033930

Dial

gauge

★

The following steps are to be followed
when measuring the clearance of swing
bearing.

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 measurement.

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

and apply the probe to the lower end of the
outer race.

2. Place the work equipment to the maxi-

mum reach position. Raise the bucket to
a height that the bucket tips and the swivel
table bottom are on the same level.

★

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

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

ZX215-1004023

ZX215-1004024

Testing and Adjusting

SY215C

6-11

4. Set the arm almost perpendicular to the

ground and lower the boom until the front
track shoe

oats.

★

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.

★

For more information, see “Swing bearing”
on page 4-12.

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.

ZX215-1004025

150

200mm

Testing and Adjusting

SY215C

6-12

6.6 Track Tension - Test and Adjust

6.6.1 Testing

1. Move your machine forward for 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 bar on the track over idler

(1) and carrier roller (2).

★

A straight angle steel bar is recommended
for this purpose as it has good resistance
to bending strain.

3. Measure the maximum clearance (a)

between the upper surface of track and the
lower edge of the straight bar.

●

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

ZX215-1004026

Testing and Adjusting

SY215C

6-13

★

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 bush-
ings, or remove a piece of track shoe.

6.6.2 Adjusting

★

If track tension is incorrect, make adjust-
ment as per the following instruction.

1. Reduce track tension

1) Loosen the valve (1) to discharge

grease. Tighten the valve after dis-
charging.

Do not loosen the valve over one turn.

If the valve is loosened too much, the
grease under high pressure may cause
the valve to shoot.

2) Check the track tension again as per

the above method after adjustment.

2. Increase track tension

1) Add grease through the grease fitting

(2) with a grease gun.

2) Check the track tension again as per

the above method after adjustment.

ZX215-1004027

ZXT215-1004003

Testing and Adjusting

SY215C

6-14

6.7 Hydraulic Pressure in Hydraulic Circuits - Test and Adjust

★

Testing and adjusting tools

Part Number

Part Name

—

60038932

Hydraulic Tester

B210770000084

Adaptor

★

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

6.7.1 Measuring

1. Preparatory work

Lower the work equipment to the ground

and stop the engine. After the engine
is stopped, operate the control levers
for several times in order to release the
residual pressure in hydraulic circuits.
Open the butterfly nut on the breather
valve. Press the relief button to release
pressure in the hydraulic tank.

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

hydraulic pressure measurement.

●

Plug (1): For rear pump oil circuit

●

Plug (2): For front pump oil circuit

2) Install the priming adaptor and connect

it to the hydraulic tester.

★

Use an oil pressure gauge with a
capacity of 40 MPa {408 kgf/cm²}.

3) Start the engine and keep it running

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

ZX215-1004028

Testing and Adjusting

SY215C

6-15

2. Measurement of unloading pressure

1) Start the engine.

2) Measure the hydraulic pressure when

the engine is running at high idle and
all control levers are in a neutral posi-
tion.

★

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

3. Measurement of work equipment pres-

sure at relief

1) Start the engine and move the cylinder

to be measured to its stroke end.

2) Measure 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 condition.

4. Measurement of swing pressure at

relief

1) Start the engine. Reach out the work

equipment as far as possible. Lower
the work equipment on the ground in
order to restrict swinging.

2) Measure 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 relief condition.

★

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

Testing and Adjusting

SY215C

6-16

★

Boom relief valve cannot be adjusted.

ZXT225-1104002

ZXT215-1004004

ZX215-1004029

5. Measurement of travel pressure at

relief

1) Start the engine and lock the travel

mechanism.

Place the pin (1) between the sprocket

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

2) Measure 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
circuit is in relief condition, the pressure
indicated is always the pressure at high
relief.

6.7.2 Adjusting

1. Main relief pressure adjustment

★

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

1) Disconnect the pilot hose.

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

ment screw (5) to adjust the pressure.

★

Pressure rises as the retainer turns
right and pressure drops as the retainer
turns left.

★

One full turn of the retainer is equiva-
lent to about 12.5 MPa {128 kgf/cm²}

Locknut:

53.5±4.9 N·m {5.5±0.5 kgf·m}

Testing and Adjusting

SY215C

6-17

3) Check the pressure again after adjust-

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

★

Connect the pilot hose before measur-
ing 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.

2. Swing relief pressure adjustment

★

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

ZXT225-1104003

ZX215-1004030

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

ment screw (8) to adjust the pressure.

★

Pressure rises as the retainer turns
right and pressure drops as the retainer
turns left.

★

One full turn of the retainer is equiva-
lent to about 6.71 MPa { 68.4 kgf/cm²}

Locknut:

78-103 N·m{8.0-10.5 kgf·m}

2) Check the pressure again after adjust-

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

Testing and Adjusting

SY215C

6-18

3. Option valve relief pressure adjustment

Adjusting procedures

1) Disconnect the pilot hose.

2) Loosen the locknut [5]. Turn the adjust-

ment screw [6] to adjust the pressure.

★

Pressure rises as the retainer turns
right and pressure drops as the retainer
turns left.

3) Check the pressure again after adjust-

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

★

Connect the pilot hose before measur-
ing the pressure.

★

Optional equipment such as breaker and
shears can be installed on the machine.
Set pressure of different breakers or shears
may vary depending on the manufactures.
Set pressure as per the specifications of
the attachment manufacturer.

★

Adjust relief pressure of valve [1] and [2]
to adjust shear split/close pressure and
breaker pressure. Adjust relief pressure
of valve [3] and [4] to adjust shear swing
pressure.

ZX215-1004029

Testing and Adjusting

SY215C

6-19

★

Testing and adjusting tools

Part Number

Part Name

—

21008760

Hydraulic Tester

B210770000084

Adaptor

6.8 Control Circuit Oil Pressure - Test and Adjust

6.8.1 Testing

Lower the work equipment to the ground

1. Remove the plug (1) for measuring the

hydraulic pressure.

2. Install the priming adaptor and connect it to

the hydraulic tester.

★

Use an oil pressure gauge with a
capacity of 6 MPa{61 kgf/cm²}

3. Start the engine and keep it running until

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

4. Measure oil pressure when the engine is

running at high idle and all control levers
are in a neutral position.

ZXT215-1004007

Testing and Adjusting

SY215C

6-20

6.8.2 Adjusting

1. If the measurement is less than 3.5 kgf/

cm², loosen the retaining nut (2) and screw
in adjusting stud (3). Watch the change
of readings on the pressure gauge at the
same time. Tighten the retaining nut (2)
when proper pressure value is achieved.

2. Remove all the tools after measurement

and make sure the machine returns to its
normal condition.

ZX215-1004031

Testing and Adjusting

SY215C

6-21

6.9 Solenoid Valve Output Pressure - Measure

★

Measuring tools

No.

Solenoid Valves to be Measured

Solenoid valve - pilot lock

Solenoid valve - boom priority

Solenoid valve - bucket con

uence/dif

ence

Solenoid valve - swing priority

Solenoid valve - Hi/Lo travel speed

Solenoid valve - secondary boosting

★

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

3. Disconnect the hose of solenoid valve

in order to measure the pressure at the
outlet.

Part Number

Part Name

—

21008760

Hydraulic Tester

B210770000084

Adaptor

Lower the work equipment to the ground

4. Install a tee to location (A) on each sole-

noid valve and connect the hose.

5. Mount the adaptor onto the tee and con-

nect it to the hydraulic tester.

★

Use a hydraulic tester with a capacity
of 6 MPa{61 kgf/cm²} .

ZXT225-1104004

Testing and Adjusting

SY215C

6-22

Table of functioning state - pilot lock sole-
noid valve

Functioning State

Function

Lockout control

Lock

OFF

Free

8. Remove all measuring tools after mea-

surement. Make sure that the machine
returns to its normal condition.

Tab. 2: Swing priority

Solenoid Valve

Output Pressure

OFF (de-energize)

0 {0}

ON (energize)

3.0~3.9 MPa{30~39 kgf/cm²}

Tab. 1: High speed travel

Solenoid Valve

Output Pressure

OFF (de-energize)

0 {0}

ON (energize)

3.9~4.1 MPa{39~41 kgf/cm²}

6. Start the engine and keep it running until

the hydraulic oil temperature rises to a
point within the operational range.

7. 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 function. (This is a special
function of the monitor.)

★

When each output pressure reads the
following values, the solenoid valve is
normal.

Testing and Adjusting

SY215C

6-23

★

Measuring tools

Part Number

Part Name

—

21008760

Hydraulic Tester

B210770000084

Adaptor

★

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

No.

Oil Circuit

Measured

No.

Oil Circuit

Measured

Boom DOWN

Arm IN

Bucket DUMP

Arm OUT

Bucket DIG

Swing

Boom UP

Travel left

Travel right

6.10 Pilot Valve Output Pressure - Measure

ZXT225-1104005

1. Remove the pilot pressure switch.

2. Install the adaptor and connect it to the

hydraulic tester.

★

Use a hydraulic tester with a capacity
of 6 MPa {61kgf/cm²}

3. Start the engine and keep it running until

the hydraulic oil temperature rises to a
point within the operational range.

4. Measure the output pressure when the

engine is running at high idle and all con-
trol levers of the tested circuit are in neutral
position or at full stroke.

Testing and Adjusting

SY215C

6-24

Control Lever

Hydraulic Pressure

Neutral

0{0}

Full stroke

Close to the average initial pres-

sure of oil control circuit

(See Table of Standard Values)

5. Remove all measuring tools after mea-

surement. Make sure that the machine
returns to its normal condition.

★

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

Testing and Adjusting

SY215C

6-25

6.11

Pilot Valves (Work Equipment and Swing) - Adjust

★

If the play of work equipment or swing con-
trol lever is excessive, make adjustment as
per the following procedure.

1. Remove the work equipment and swing

pilot valve assembly.

2. Remove the rubber sleeve (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 speci

ed torque.

Locknut:

98~127 N·m {10~13 kgf·m}

5. Install the rubber sleeve (1).

6. Install the work equipment and swing

pilot valve assembly.

ZX215-1004032

SANY Crawler Hydraulic Excavator SY215CLC (CUMMINS QSB6.7 engine). Shop Manual - page 22