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SANY Crawler Hydraulic Excavator SY365H-9, SY365BH-9. Shop Manual (2014) - page 34

8-77

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

12. Disconnect the bucket hoses (24) and (25).

Seal the ports properly.

13. Disconnect the arm hoses (26) and (27).

Seal the ports properly.

ZXT335-1006908

14. Disconnect the hoses (28), (29), (30) and

(31) between the central swivel joint and
the main valve. Seal the ports properly.

15. Disconnect the swing motor hoses (32)

and (33). Seal the ports properly.

16. Disconnect the hose (34) between control

valve and swing motor port (M) and the
hose (35) between control valve and swivel
joint.

ZXT335-1006909

Fig. 8-149

ZXT335-1006137

Fig. 8-150

Fig. 8-151

17. Disconnect the tube or hose (36) of radia-

tor and the oil return tube (37) of hydraulic
tank. Seal the ports properly.

8-78

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

18. Disconnect the hydraulic pump hoses (38)

and (39).

19. Remove the two pilot hoses under the

control valve and tag them properly.

(40) Right travel backward

(41) Left travel backward

ZXT335-1006138

Fig. 8-152

ZXT335-1006139

Fig. 8-153

20. Remove the harness and hoses of the

solenoid valve and tag them properly.

(42) Oil return hose

(43) Harness

(44) Negative feedback hose from solenoid

valve to front pump

(45) Negative feedback hose from solenoid

valve to rear pump

(46) Oil feed hose from solenoid valve to

PT block

ZXT335-1006140

Fig. 8-154

8-79

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

21. Remove the bolts (48) of the control valve

assembly. Lift the control valve assembly
in order to dissemble it.

Control valve AS: 380 kg

ZXT335-1006141

Fig. 8-155

8.22.2 Installation

●

Installation is performed in the reverse pro-
cedure of removal.

●

lling the oil (to hydraulic tank)

ll hydraulic oil through the

ller open-

ing to the speci

ed level. Start the engine

to circulate oil in the hydraulic system, and
check the oil level again.

●

Purging the air

See

“Air in Each Component - Purge”

on page 6-41

8-80

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZX335-1006142

Oil stopper

8.23 Hydraulic Pump AS

8.23.1 Removal

Lower the work equipment to the ground in
order to ensure safety. Stop the engine. Press
the release button of the breather valve to re-
lease remaining pressure in the hydraulic tank.

Disconnect the cable from the negative (-)
post of the battery before performing the job.

●

Tag each line so as to ensure correction
reinstallation.

1. Remove the oil inlet

lter element from the

hydraulic tank and stop oil out

ow with an

oil stopper.

If no oil stopper is used, remove the drain
plug and drain the oil from the hydraulic
tank and the lines.

Hydraulic oil tank: About 340 L

2. Remove the engine hood (1)

3. Remove the rod (2) and bolts (3). Lift the

engine hood.

WT365081301

ZXT335-1006144

Fig. 8-156

Fig. 8-157

Fig. 8-158

8-81

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZXT335-1006145

ZXT335-1006146

4. Remove the upper right coverplate (4).

5. Disconnect the hose (5) supplying oil to the

lower proportional valve and the hose (6)
delivering oil from the pilot pump. Seal the
ports properly.

6. Remove the shutdown device line (7).

ZXT335-1006147

Fig. 8-159

Fig. 8-160

Fig. 8-161

8-82

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZXT335-1006148

ZXT335-1006149

7. Remove the right door (8).

8. Remove the hydraulic pump cover (9).

9. Disconnect the oil drain hose (10) and seal

the ports properly.

10. Disconnect the high-pressure hoses (11)

and (12) connected to the control valve,
and seal the port properly.

11. Disconnect the harness (13) of the pres-

sure transducer.

12. Disconnect the pilot pump oil suction hose

(14) and seal the port properly.

13. Disconnect the hydraulic pump oil suction

tube (15) and seal the port properly.

14. Disconnect the solenoid valve harnesses

(16) and (17).

ZXT335-1006150

Fig. 8-162

Fig. 8-163

Fig. 8-164

8-83

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

15. Remove the four bolts (18) of the hydraulic

pump. Lift the hydraulic pump assembly
(19) in order to disassemble it.

Hydraulic pump assembly: 186 kg

ZX335-1006123

Screw

Upper side

Lower side

ZX335-1006124

Tube

Clamp 1

Clamp 2

O-ring seal 1

O-ring seal 2

Hose

8.23.2 Installation

●

Installation is performed in the reverse pro-
cedure of removal.

●

After tightening the hose clamping
screw, check that the screw should be
in the range indicated on the right illus-
tration.

Screw (suction hose clamp):

10~13 N·m {1.0~1.3 kgf·m}

●

Install the hose clamp and tighten the
screw according to the illustration on
the right.

Mating surface (hydraulic pump

housing):

Gasket sealant: (Loctite 515)

●

lling the oil (to hydraulic tank)

ll hydraulic oil through the

ller open-

ing to the speci

ed level. Start the engine

to circulate oil in the hydraulic system, and
check the oil level again.

Hydraulic tank: About 340 L

●

Purging the air

See

“Air in Each Component - Purge”

on page 6-41.

ZXT335-1006151

Fig. 8-165

Fig. 8-166

Fig. 8-167

8-84

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

3
4

ZX335-1006152

ZX335-1006153

8.24 Middle Oil Seal (Hydraulic Pump Input Shaft)

8.24.1 Removal

1. Remove the hydraulic pump assembly (1).

See

“Hydraulic Pump AS” on page 8-80.

2. Remove the screw (2). Remove the bear-

ing cover (3).

3. Pry the oil seal (4) out with a screwdriver.

●

Take care not to damage the shaft
while prying the oil seal.

8.24.2 Installation

●

Installation is performed in the reverse pro-
cedure of removal.

Seal lip: grease (No.1 Calcium base

grease)

Seal circumference: grease (No.1

Calcium base grease)

●

Apply a thin layer of grease to the oil
seal circumference.

Fig. 8-168

Fig. 8-169

8-85

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZXT335-1006154

8.25 Pilot Valve AS (Work Equipment)

●

This section discusses only the precautions when reassembling the work equipment pilot
valve assembly.

●

Reassembly of the work equipment pilot
valve assembly

1. Install the plate (9) in the valve body

(8) with O-ring seal. Tighten the socket-
headed screw (10).

Screw (socket head): 25~33 Nm

{2.55~3.36 kgm}

2. Insert the spring (7) into the spool hole in

the valve body (8). Put the spool (6) in the
spring. Install the plug (5) on the spool.
Push the plug (5) to the spool hole.

3. Install the plate (4) on the plug (5). Tighten

the U-joint (3).

4. Install the plate (2). Align the position of the

plate (2) and tighten the nut (1).

Nut: 98~133 Nm {10~13.5 kgm}

●

Location of each oil port is stamped on
the bottom of valve body.

Plug (5) circumference: Grease

(No.1 Calcium base grease)

U-joint working surface: Grease

(No.1 Calcium base grease)

Threads in valve body: Thread ad-

hesive (Tianshan 1277)

5~7 mm

ZX335-1006155

Apply the thread adhesive (Tianshan 1277)
to two points on the inner threads, as
indicated in the illustration on the right. The
amount of application is approximately 0.02
g.

U-joint (3): 98~133 Nm {10~13.5

kgm}

●

Tightening is to be made to the speci-

ed torque.

Fig. 8-170

Fig. 8-171

Contact surface between plug (5)

and plate (2): Grease 0.3~0.8cc (G2-L1)

●

After assembling plate (2) see

“Work

Equipment and Swing Pilot Valves -
Adjust” on page 6-33

8-86

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

Pushrod

ZXT335-1006156

8.26 Travel Pilot Valve AS

●

This section discusses only the precautions when reassembling the travel pilot valve assem-
bly.

●

Reassembly of pedal pilot valve assembly

1. Install the spring (8) into the spool installation hole in the body assembly (9). Install the spool

(7). Place the cover assembly (6) on the spool and press the cover assembly (6) with a hand.

2. Install the cover (4) after aligning the holes. Tighten the socket-headed bolts (1).

Bolt (socket head): 98~114 Nm {10~11.6 kgm}

3. Install the dust ring (3) on the plug. Install the cover (2) and

x the cover (2) with the camshaft

(5).

Contact surface between the plug and the dust ring (3): Grease (No.1 Calcium base

grease)

Fig. 8-172

8-87

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

8.27 Hydraulic Cylinder AS

Special tools

Tool Description

Sketches

Necessity

Quantity

For pulling out/

pushing in the

bushing

■

For press

tting the

dust ring

■

For O-ring seal cor-

rection

For insertion

For correction

■

For inserting the

cylinder head

■

For inserting the

piston

■

8-88

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZX335-1006162

Secure the cylinder

ZX335-1006163

Approx 1.5 m

8.27.1 Disassembly

1. Drain the oil and remove the tubing.

2. Fix the cylinder.

●

Fix the cylinder in a vertical or level
manner. A vertically fixed cylinder can
be disassembled and assembled eas-
ily.

●

The pin hole in the head end can be
used for fixing of the cylinder. The pin
roll can prevent the cylinder from turn-
ing.

●

Remove the tubing in case of tubing in-
terference while

xing the cylinder.

3. Removal of cylinder head

●

Unscrew the bolts with Allen Wrench.

●

Using an extension rod, as shown in
the illustration on the right, will make
the work easy.

Fig. 8-173

Fig. 8-174

8-89

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZX335-1006164

Sleeper

ZX335-1006165

Secure

ZX335-1006166

Drill bit

4. Pulling out the piston rod

●

Be sure to have removed the tubing
cover.

●

Prepare a suitable container to collect
oil coming out of the oil port.

●

After pulling out the piston rod (1) to its
limit, slowly loosen the cylinder head
and pull it out.

●

Remove piston rod (1) with cylinder
head (2) and place them on a wooden
sleeper.

5. Securing the piston rod

●

Pin hole on the rod end or the

at part

of the ear can be used to

x the piston

rod and prevent it from turning.

6. Remove of piston nut (5)

A. Remove the fixing screw (3) from the

piston nut (5).

●

Around the fixing screw there are two
points that have been punched against
loosening. After removing the riveted
part with a hand drill, loosen and re-
move the

xing screw (3).

B. Remove the steel ball (4) inside the

xing screw.

Fig. 8-175

Fig. 8-176

Fig. 8-177

8-90

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZX335-1006168

ZX335-1006169

Threads

Piston rod

With one opening

(two-piece type)

C. Remove the piston nut (5).

●

The piston nut (5) is very tight. To
loosen the piston nut (5), prepare a
hydraulic jack or a spanner powered
by hydraulic cylinder. An extension rod
should be ready when removing the
piston nut (5) manually.

ZX335-1006167

Hydraulic jack

Hydraulic cylinder

7. Removal of piston assembly

Remove in turn the piston (7), buffer sleeve
(6) and cylinder head (2).

8. Removal of the buffer sleeve (8) on the

head end

A. Remove

rst the piston nut (5).

B. Use a tool like rubber hammer to tap

the piston nut (5) slightly in order to
remove it. The piston rod and the
buffer sleeve (8) should be kept intact.
Remove the elastic retainer (9).

C. Slide the buffer sleeve (8) toward the

piston threads in order to remove the
two-piece stopper ring.

D. Remove the buffer sleeve (8).

E. There is an opening in the buffer seal

(10). Take advantage of this opening to
remove the buffer seal (10).

Fig. 8-178

Fig. 8-179

Fig. 8-180

8-91

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZX335-1006170

Screwdriver

Piston

Bench clamp

ZX335-1006171

ZX335-1006172

Press

Block

Support

9. Removal of piston seal

A. The slide ring (12) and the guard

ring (13) can be simply removed with
hands.

B. The seal (14) can be removed with a

hammer and a

at-head screwdriver.

C. Remove the O-ring seal (15) with a pry

bar.

●

The removed seals should not be re-
used.

10. Removal of buffer ring (16)

●

The buffer ring (16) is installed in the
inner groove in the cylinder head. Use
a tool with sharp end to pry it out and
remove it with a scraper.

11. Removal of the U-ring (17) and the dust

ring (18).

A. Remove the U-ring (17) with a tool such

as screwdriver.

B. Press a tool (such as a screwdriver)

against the dust ring (18) and hammer
the screwdriver to remove the dust ring
(18).

●

The removed seals should not be re-
used.

12. Removal of bushing (19)

A. Remove the elastic ring (20) from the

cylinder head (2) with a screwdriver.

B. Push the bushing (19) out with the help

of clamps and press.

13. Removal of pin bushing (21)

A. Remove the dust ring (22) on the side

of cylinder barrel and piston rod with a
tool such as screwdriver.

B. Remove the bushing (21) with the help

of a suitable cushion block.

Fig. 8-181

Fig. 8-182

Fig. 8-183

8-92

Disassembly and Assembly

SY365(B)H-9 Crawler Hydraulic Excavator

ZX335-1006173

Press

Installation tool

Piston rod

Block

ZX335-1006174

Hydraulic press

Too

Under pressure

8.27.2 Assembly

1. Installation of bushing (21)

A. Use an installation tool to press the

bushing (21) into the bushing (lubricated
with hydraulic oil) on the side of piston
rod and cylinder barrel.

B. Install the dust ring (22) with the help of

a suitable cushion block.

2. Assembly of cylinder head (2)

A. Use the press to push in the bushing

(19).

●

Apply hydraulic oil to the inside of
cylinder head in advance. Make sure
that the bushing (19) pushed in is
free from a raised shoulder.

Fig. 8-184

Fig. 8-185

Fig. 8-186

B. Use the press to push in the dust ring

(18).

C. Install the guard ring and the U-ring (17)

sequentially in the U-groove.

●

Install the U-ring (17) in correct direc-
tion. Make sure that the U-ring is in-
tact before installation.

●

Inverse installation will cause leak of
oil.

●

Make sure that the U-ring is free from
any corrugation or permanent defor-
mation after installation.

D. Installation of buffer ring (16)

●

Make sure that the seal is installed in
correct direction. Inverse installation
can cause high pressure between the
buffer ring (16) and the U-ring (17),
which may lead to deformation or
breakage of oil cylinder.

E. Install the elastic ring (20) to prevent

the fall of the bushing (19).

ZX335-1006175

U-groove

Press in

Tool

Content .. 32 33 34 35 ..