Yuchai YC25-8 User manual

Hydraulic Digger
USER MANUAL

Not correct operation could cause the damage. Before the
machine can be used, it should be done as follow:
● Remember the operation manual and the use criterion
● Read &understand the content of the user manual about the
safety operation
● Understand & know the safety sign of the machine
● Let the person leave the workplace who not the operator
● It should have a safety operation training before you operates
the machine
You have the duty to observance the ordinance & laws, follow the
relevant direction about machine operation & maintain from
YUCHAI.

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Contents
Ⅰ、Prolegomena
To user------------------------------------------------------------------------1-2
Product Information -------------------------------------------------------------1-3
Direction of The Machine ------------------------------------------------------1-5
Machine Form---------------------------------------------------------------------1-6
Technical Parameters ----------------------------------------------------------1-7
Ⅱ、Safety Rule
General rules----------------------------------------------------------------------2-2
Safety Prompt --------------------------------------------------------------------2-3
Safety Equipment ---------------------------------------------------------------2-4
Safety Sign ------------------------------------------------------------------------2-5
Safety of The Workplace -----------------------------------------------------2-13
Safety Operation ---------------------------------------------------------------2-14
Transport &Load and Unload -----------------------------------------------2-24
Maintain --------------------------------------------------------------------------2-25
Fire-proof、Explosion-proof& Antigas -------------------------------------2-26
Accumulator ---------------------------------------------------------------------2-27
Hydraulic System --------------------------------------------------------------2-28
Ⅲ、Parts Introduction
Pandect for Operation Device(Cab Type) ---------------------------------3-2
Pandect for Operation Device(Canopy Type) ----------------------------3-3
Panel Switch of Left Controlling Box(Switch group)---------------------3-4
Panel Switch of Right Controlling Box(Panel meter and Switch)-----3-5
Safety Lock Part ----------------------------------------------------------------3-7
Operate The Operation Device& Rotating Device ---------------------3-8
Driving Operation --------------------------------------------------------------3-10

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throttle grip ----------------------------------------------------------------------3-11
driver's chair --------------------------------------------------------------------3-12
safety belt -----------------------------------------------------------------------3-13
Air-condition Control ----------------------------------------------------------3-14
Radio ------------------------------------------------------------------------------3-18
Door and Window --------------------------------------------------------------3-20
Ⅳ、Operation Manual
Prepare for Running Machine ------------------------------------------------4-2
Engine Operation ----------------------------------------------------------------4-3
In&Out Machine ------------------------------------------------------------------4-7
Moving The Machine -----------------------------------------------------------4-8
Turning The machine ---------------------------------------------------------4-10
Rotating The Machine --------------------------------------------------------4-11
Operate The Operating Device ---------------------------------------------4-12
Working On The Slope or In The Water ----------------------------------4-14
Out of The Muddy Condition ------------------------------------------------4-15
Operating Manual --------------------------------------------------------------4-16
Take-down & Installing The Bucket ----------------------------------------4-19
Place The Machine ------------------------------------------------------------4-20
After The Operation -----------------------------------------------------------4-22
Takedown &Transport The Machine --------------------------------------4-23
Operate The Machine Under The Cold/Hot Weather -----------------4-28
Deposit The Machine ---------------------------------------------------------4-29
Reason for the Technical Trouble& Resolve ----------------------------4-31
Ⅴ、Maintenance
General Knowledge of Maintenance ----------------------------------------5-2
Maintenance Summary --------------------------------------------------------5-4
Easy Broken Part ----------------------------------------------------------------5-6

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Forced Changing Part ----------------------------------------------------------5-7
Choose List of the Oil Plants--------------------------------------------------5-8
The Tighten Moment ------------------------------------------------------------5-9
Maintenance List of Time-check -------------------------------------------5-12
Routine Check ------------------------------------------------------------------5-14
Fuel System of the Engine ---------------------------------------------------5-15
Cooling System of the Engine ----------------------------------------------5-19
Lubricating System of the Engine ------------------------------------------5-22
Air Intake System of The Engine -------------------------------------------5-24
Other Maintenances of The Engine ---------------------------------------5-26
Hydraulic System --------------------------------------------------------------5-27
Accumulator ---------------------------------------------------------------------5-33
The Reducer --------------------------------------------------------------------5-35
Pedrail-----------------------------------------------------------------------------5-37
Support Roller,Carrier Roller& Leading Roller -------------------------5-38
Lubricating -----------------------------------------------------------------------5-39
Air-condition(If the machine have) -----------------------------------------5-40
Replace The Gear of The Bucket ------------------------------------------5-43
Washing The Plastic Cushion of the floor --------------------------------5-44
Fuse -------------------------------------------------------------------------------5-45
Ⅵ、Attachment Manual
Safety Item-------------------------------------------------------------------------6-2
Installing & take-down step of the attachment ----------------------------6-3
Operation Manual of the attachment ----------------------------------------6-4
Daily Check of Hydraulic Crush Hammer ----------------------------------6-9
Attachment:
Black Manual of TheCertification

Guangxi Yuchai Heavy Industry Company Limited

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1
Prolegomena

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Product Information
When you want to know the informations of the machine, please
view the picture as follow:
● Overall Information(The nameplate is on the nearside of the
platform)
● Engine Information(The nameplate is in the top of the cylinder
cover)

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●Running Information(The timer of the engine is in the digital
combination instrument which in the cab)
Machine File
Please fill the machine and engine’s series No. in the table.When
you need to buy the spare parts or the relational informations,you
can tell us the No..
Direction of The Machine

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Front、back、left、right、top、underside in the manual same as
the direction as follow:

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Machine Form (The Moving–arm Un-deflecting Type)
1. Bulldozer 2.Bucket 3. Bucket oil cylinder
4. Lever 5.Lever oil cylinder 6.Moving-arm
7. Moving-arm oil cylinder 8. Rotating platform
9. Rotating platform oil cylinder 10.Driving wheel
11.Pedrail 12.guide deflection sheave
13.Bulldozer oil cylinder
Note:The lookum is optional equipment.It only used in the better condition.
Technical Parameters

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1.Frame dimension parameter
YC25-8
Code Item Unit 825E
Operating Weight Kg 3080
Standard bucket capacity M30.07
Name of engine Kubota D1803 Cummins A1700
Power of engine Kw/rpm 22.8/2200 24/2200
A Length Mm 4508
B Height Mm 2400
C Overall width Mm 1450
D Width of pedrail Mm 300(steel/rubber)
E Rotating radii of platform Mm 1351
F Length of pedrail Mm 1935
G Distance of roller Mm 1455
H Height from floor Mm 320
I Height of Boom end Mm 1409
J Width of the platform Mm 1420
K Height of engine cover Mm 1384
L Height from floor of platform Mm 563
Width of bucket Mm 517
Driving speed(low/hight) Km/h 2.4/4.2
Rotating speed of platform Rpm 10~12
Cab ●
Canopy ●
Deflection angle(left/right) ° 80/50
Note:Technical paremetes are subject to replace without prior notice!

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2.Operating parameters
YC25-8
Code Item Unit 825E
A Max. digging height Mm 4205
B Max.height of load&unload Mm 2840
C Max. digging depth Mm 2610
D Max. digging radii Mm 4610
D1 Max.digging distance of level floor Mm 4487
E Digging radii of Max.digging height Mm 2957
F Min. rotating radii Mm 1856
G Max. bucket depth of Bulldozer Mm 372
H Max. uplift height of Bulldozer Mm 262
Max.dig power KN 17.4
Note:Technical paremetes are subject to replace without prior notice!

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3. Bucket series (black area is standard collocate)

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4.Driving machine
It adopts the hydraulic motor thought the multilevel epicycle reducer
to become independent drive.The reducer inside of the padrail.
Driving speed(km/h) Max.pull(kN) Power of make the grade
High speed 4.3 12.36
Low speed 2.4 22.94 58%(300)
5.Hydraulic system
First enter to the throttle hydraulic system
Main valve:Intake multiple valve
Variable plunger pump:Flux of 2 plunger pump(L/min) 52.8
Pressure(Mpa) 21
Flux of 1 gear pump(L/min) 15.4
Pressure(Mpa) 21
Flux of lead gear pump(L/min) 7.7
Pressure(Mpa) 3.9
Return oil filter:paper material with 10micron
Oil absorbent filter: gridding filter
7.Electric system
Voltage: 12V
Accumulator:60 x 2AH

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SafetyRules

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Safety Prompt
1. Warning sign
In the user manual, the sign shows the
import information about the safety. When
you see the sing, you need to read the
information behind the sign careful
2. Safety prompting word
The machine includes ”Danger”、”Warning”、”Notice” etc. The safety
prompting word. Explain them as follow:
●Danger: If not elude, the result may be lead die or hurt. It only
use in the condition which have the most dangerous.
●Warning: If not elude, the potential danger may be lead die or
hurt.
●Notice: If not elude, the potential danger may be lead hurt. Or
it can prompt the operation which can hurt the body.

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Safety Equipment
1.The safeguard for the operator
1) The operator need put on theinterrelated safeguard: sheathy
work clothes、motorcycle safety helmet、work shoe and so
on(safety glass、safety earplug、glove、safe belt)
2) IF the operator has long hair, please tie it and wear the
motorcycle safety helmet. It can protect your hair not into the
machine.
3) The user need put some first-aid medicines in the machine, and
routine check them.
4) Before operating or examining, please check the function of the
safeguards are ok.
2.Flee hammer & fire extinguisher
Flee hammer & fire extinguisher installing on the wall of the cab.
When you couldn’t out or into the cab, need escape the cab, you
can use the flee hammer break the glass. But when you break the
glass, please protect you eye and face.
When the machine burning, please use the fire extinguisher.
Please read the user manual of the fire extinguisher carefully.
Routine check and maintenance the fire extinguisher.

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Safety Sign
Warning: if you don’t know the safety sign or the safety
sign loses, it may be make some casualty. Please
replace the lose or broken sign timely, and make the
safety sign cleanness and easy to see.
Please read the user manual and the safety sign carefully before
operation、maintenance、maintain the machine.
Check the sign before running the machine every day. If they not
see clear, please clean them.
When cleaning the sign, it only use the calico、water、soap. Don’t
use the organic solvent、gas, etc. They many are make the sign
lose.
1.Sort of safety sign
In the user manual, the safety sign adopts “Glossary safety sign”
and ”Graphic safety sign”.
A. Graphic safety sign
It use the picture to show the
Safety warning information.
Simple and easy to understand.
B. Glossary safety sign
It used the picture and word to
show the safety warning
information. It use for the way
which the picture couldn’t show
the infofrmtion,and need the
word to explain.