Componentes Hidráulicos (SK210 Y SK330)

Dynamic Acera 01/04-MC Page 5-1

KobelcoDynamicAcera

Kobelco Construction Machinery America LLCHydraulic Components

Kobelco ConstructionMachinery America LLC

Dynamic Acera 01/04-MCPage 5-2

4. COMPONENTS AND CIRCUIT DIAGRAM4-1 Layout of Hydraulic components (SK210)

A/CCompressor

Radiator &Oil cooler

HYDRAULIC COMPONENTS

(Battery relay) Fuel tank Hydraulic tank Controlvalve

Pump

Engine

(Receiver tank)Sub tank

(A/C Condenser)

(Solenoid proportional valve block)

(Sensor block)

Air cleaner

Washer tank

(A/C Unit)Pilot valve (LH)(Arm, Swing)

Pilot valve (RH)(Boom, Bucket)

Travel pilot valve

Swivel joint

Slewing motor

(Battery)


Typical of SK210 SK250

HYDRAULIC TANK

Sight Gauge

Suction inlet port

Tank return tomain Filters

Main FilterCompartmentAir Breather

Pilot Filter Manifold

Filter(Remove,

Replace every500 Hours)

Cover(Remove,

Replace filter& Reinstall)

Base(with one

way checks)

Cap

Filter(Remove,Clean &

Reinstall)

O-ring(Replace &Lubricate)



MINOR CHANGE HYDRAULIC TANK

Sight Gauge

Suction inlet port

Tank return tomain Filters

Main FilterCompartmentAir Breather

Pilot Filter Manifold

Filter(Remove,

Replace every500 Hours)

Cover(Remove,

Replace filter& Reinstall)

Base(with one

way checks)

Cap

Filter(Remove,Clean &

Reinstall)

O-ring(Replace &Lubricate)



NOTEAlways consult you operation manual for propermaintenance intervals.

Service Interval : 2000 hrs - Normal Conditions

O-Ring

Sucton Strainer

Service Interval : 500 hrs - Normal ConditionsOption/Breaker Filter : 250 hrs.


HYDRAULIC TANK

Main Return Filter

Service Interval : 500 hrs - Normal ConditionsOption/Breaker Filter : 250 hrs.Note: Always consult you operation manual forproper maintenance intervals.Main Return Filter Bypass Check Valve

If the main return filter plugs due to excessivecontamination then unfiltered oil will bypass thefilter thru this check valve and continue to supplythe main pump with lubrication oil


Typical Location of SK290 SK330

Bypass CheckValve

HYDRAULIC TANK

BypassCheck Valve

Typical Location of SK210 SK250


HYDRAULIC PUMP

Typical of SK160

Proportional Valve Non AdjustablePositive Control


HYDRAULIC PUMP

Typical of ED190

Dozer Gear pump


OLD Style Pump SK210 ~330

Port a2 Port a1

High PressureSensors

Port a3

Back-upMode Spool

Pump Casing Fill& air bleeder Plug

Auxarily Pump mount

HYDRAULIC PUMP

Back-upMode Spool


Minor Change Style Pump SK210 ~290

Port a2 Port a1

High PressureSensors

Port a3

IndependantTravel BypassBlock

Pump Casing Fill& air bleeder Plug

Auxarily Pump mount

MINOR CHANGE HYDRAULIC PUMP

Back-upMode Spool


Pilot Pump - Specified as P33) Gear pump (For pilot control)

Hydraulic circuit

Note:1. After assembly of gear pump, check that the drive gear rotates smoothly at 0.1 Nm {1.0

kgfm} or less.2. After assembly of gear pump, apply sufficient oil in the gear section.3. Bring the opposite side of caulking of the filter shown in the left figure into contact with the

insert end face, paying attention to the installing direction.

C ode N am e Q ty.307 P oppe t 1 308 S eat 1 309 S pring seat 1 310 S pring 1 311 A d just screw 1 312 Lock nu t 1 351 G ear case 1 353 D rive gear 1 354 D riven gear 1 355 F ilte r 1 361 F ront case 1 433 S ocket bo lt (M 8 x 40) 2 434 S ocket bo lt (M 8 x 55) 2 435 S ocket bo lt (M 8 x 20) 4 466 P lug (P F 1 /4 ) 1 467 A dapter (PF 1 /2P F 3/8) 1 700 S quare ring 1 710 O -ring (J IS B 2401-G 95) 1 725 O -ring (J IS B 2401-P 11) 1 728 O -ring (J IS B 2401-P 18) 1 732 O -ring (J IS B 2401-P 16) 1 850 Locking ring (J IS B 2804-R R -18) 1

Code Thread size 312 M 14 x 1.5 29.4 {3.0} 433, 434 435 466 PF 1/4 15.7 {1.6}

T ightening torque

M 8

Torque Nm {kgfm }

16.7 {1.7}

HYDRAULIC PUMP


HYDRAULIC PUMP

Negative Control Typical of SK210 ~330 ( Old Style Pump)

Negative Control Typical of SK210 ~330 ( Old Style Pump)


Positive Control Typical of SK210

Positive Control Typical of SK210

MINOR CHANGE HYDRAULIC PUMP


HYDRAULIC PUMP

Note: GPM given are ApproximateGPM = RPM X C.C. X .000261 Ounce U.S. = 29.5 C.C.

PUMP FLOW:SK160/ED190:MAX GPM: 37.9 X 2 PUMPSSK 210:MAX GPM: 55.5 X 2 PUMPSSK250:MAX GPM: 63.4 X 2 PUMPSSK290:MAX GPM: 63.4 X 2 PUMPSSK330:MAX GPM: 66.8 X 2 PumpsSK480:MAX GPM: 97.7 X 2 Pumps

Typical of SK210 ~330


3. Structure1) Main pump

HYDRAULIC PUMP

Typical of SK210 ~330

Code Name Qty. Code Name Qty. Code Name Qty.111 Shaft (Front) 1 313 Valve plate (R) 1 725 O-ring (JIS B2401-P11) 7 113 Shaft (Rear) 1 314 Valve plate (L) 1 728 O-ring (JIS B2401-P24) 4 114 Spline joint 1 325 Cover 1 732 O-ring 2 123 Roller bearing 2 401 Socket bolt (M20 x 210) 8 774 Oil seal 1 124 Needle bearing 2 406 Socket bolt (M8 x 20) 4 127 Bearing spacer 4 407 Socket bolt (M6 x 30) 3 141 Cylinder block 2 466 VP plug (PF 1/4) 2 151 Piston 18 468 VP plug (PF 3/4) 4 152 Shoe 18 490 Plug (Meck) 20 806 Nut (M16) 2 153 Retainer 2 531 Tilting pin 2 808 Nut (M20) 2 156 Spherical bushing 2 532 Servo piston 2 824 Snap ring 2

157 Cylinder spring 18 534 Stopper (L) 2 885 Pin ( 8 x 12L) 2 211 Shoe plate 2 535 Stopper (S) 2 886 Spring pin 4 212 Swash plate 2 546 Spacer 2 901 Eye bolt (M10) 2 214 Tilting bushing 2 548 Feed back pin 2 953 Set screw 2 251 Support 2 702 O-ring 2 954 Set screw 2 261 Seal cover 1 710 O-ring (JIS B2401-G95) 1 981 Name plate 1 271 Pump casing 2 717 O-ring (JIS B2401-G145) 4 983 Rivet 2 312 Valve block 1 724 O-ring (JIS B2401-P8) 16

2

792 Back-up ring (JIS B2407-G35)

2

789 Back-up ring (JIS B2407-P18)


Internal Pump Control:Internal pressure is applied on the small side of the Servo piston to maintain positon whenthe pump flow rate is increased this is accomplished by two things.1. PSV pressure enters the requlator on the large side of the servo piston to position thepump swash plate angle to minumn.2. The PSV pressure is reduced on the large side of the servo piston which allowspressure on the large piston side of the servo piston to be redirected to tank allowing thepump to come on stroke and increase the pump flow.

This internal differential pressureization allow variable control and also a more smoothcontrol on the pump flow output.

HYDRAULIC PUMP REGULATOR

Minumn Stroke Angle Maxumn Stroke Angle

Minimum Angle Maximum Angle


2) Regulator Structure of regulator

HYDRAULIC PUMP REGULATOR (NEGATIVE CONTROL)

P

P

a1 PSV

PN

a3

a2

PH

B1


Pi1 Pi2

T2

P1' P2'

a1 a2

SE23SE22

A3D3

PH1

a2A1 A2a1PH2

M

PSVP2

PN2

a4

PN1

a5

B3

B1

a3

Dr

PSVP1 PP

~85

psi

~85

psi

MINOR CHANGE REGULATOR (POSITIVE CONTROL)


Code Name Qty. Code Name Qty.412 Socket bolt (M8 x 50) 2 730 O-ring (JIS B2401-P22) 1 413 Socket bolt (M8 x 70) 2 732 O-ring (JIS B2401-P16) 2 418 Socket bolt (M5 x 12) 2 733 O-ring (JIS B2401-P20) 2 436 Socket bolt (M6 x 50) 5 734 O-ring (JIS B2401-G25) 1 438 Socket bolt (M6 x 20) 4 753 O-ring (JIS B2401-P9) 1 439 Socket bolt (M6 x 40) 4 755 O-ring (JIS B2401-P11) 6 466 VP plug (PF 1/4) 3 756 O-ring (JIS B2401-P26) 2 467 Plug (PF 3/8 x M8) 1 763 O-ring (JIS B2401-G35) 1 496 Plug 18 801 Lock nut (M8) 3 541 Seat 2 814 Snap ring (JIS B2804 SR-15) 1 543 Stopper 1 2 836 Snap ring 1 545 Ball 2 858 Locking ring (JIS B2804 RR-15) 2

601 Casing 1 874 Pin ( 4 x 11.7L) 1 611 Feed back lever 1 875 Pin ( 4 x 8L) 4 612 Lever (1) 1 887 Pin 1

613 Lever (2) 1 897 Pin ( 4 x 19L) 1 614 Fulcram plug 1 898 Pin ( 6.5 x 9L) 1 615 Adjust plug 1 924 Set screw 1 621 Compensating piston 1 925 Set screw (Q1) 1 622 Piston casing 1 623 Compensating rod 1 079 Solenoid valve 1 624 Spring seat (C) 1 625 Outer spring 1 626 Inner spring 1 627 Plunger (C) 1 628 Adjust screw (C) 1 629 Cover (C) 1 630 Lock nut 1 631 Pf sleeve 1 641 Pilot cover 1 642 rod 1 643 Pilot piston 1 644 Spring seat (Q) 1 645 Plunger (Q) 1 646 Pilot spring 1 651 sleeve 1 652 spool 1 653 spring seat 1 Code Size654 Return spring 1 412, 413 M8 29.4 {3}655 Set spring 1 436, 438, 439 M6 11.8 {1.2}656 Port plate 1 466 PF 1/4 36.3 {3.7}708 O-ring (JIS B2401-G75) 1 467 PF 3/8 73.5 {7.5}722 O-ring (JIS B2401-P6) 2 496 PTF 1/ 8.8 {0.9}724 O-ring (JIS B2401-P8) 12 630 30 X 1 156.8 {16}725 O-ring (JIS B2401-P10) 1 801 M8 15.7 {1.6}727 O-ring (JIS B2401-P14) 1 728 O-ring (JIS B2401-P18) 1

Tightening torqueTorque



HYDRAULIC MAIN CONTROL VALVE


Travel Straight

Boom

Swing

Bucket

Travel Left

Travel Right

Boom Conflux

P1 by-pass cut (Top) &Arm Conflux (bottom)

ArmV/R (top)&P2 by-pass cut (bottom)

Negative Control Relief

Swing Priority

Arm

Back Pressure PortFront of Machine

CircuitRelief



Boom Holding Valve

Option ValveActivation Port

Travel Straight

Travel Right

Bucket

Travel LeftSwing

AVRArm Variable Regen(top)

Boom

P1 By-Pass Cut(Top)

Arm

BoomConflux


Main Relief

Front of Machine


MINOR CHANGE MAIN CONTROL VALVE (Positive Control)

Typical of MINOR CHANGE SK210 SK250

Travel Straight

Boom

Swing

BucketTravel Left

Travel Right

Boom Conflux

P1 by-pass cut (Top) &Arm Conflux (bottom)

ArmV/R (top)&P2 by-pass cut (bottom)Auxiliary Port

(STD. Blank)

Low Flow Port

Arm

Front of Machine

CircuitRelief

Auxiliary ValveActivation Port


MINOR CHANGE MAIN CONTROL VALVE (Positive Control)

Boom Holding Valve

Option ValveActivation Port

Travel Straight

Travel Right

Bucket

Travel Left

Swing

AVRArm Variable Regen(top)

Boom

P1 By-Pass Cut(Top)

Arm

BoomConflux

Typical of MINOR CHANGE SK210 SK250

Main Relief

Front of Machine



Front of Machine

Typical of SK480

Travel Straight

Travel Right

Bucket

Travel Left

Swing

Arm

Main Relief

ArmConflux

Boom BoomConflux

Option 1

Cover foroption -2 block


1. The material of casing has changed from casting iron to aluminum alloy to makelighter weight .

2. Shuttle block on lower part is canceled, and low pressure sensor is used to sendpilot secondary pressure signal to controller.

Note: 1. P port inlet has a filter of 40 mesh or more to protect spool from foreign matter.

2. Before tightening adjusting nut ofpilot valve, apply Locktite #277 onjoint thread section.

3. Apply grease on rotating and slidingsections of joint, and give attentionto the assembling direction.

4. Apply grease on push rod top end.5. Thickness of washer 2 (shim) for

regulating secondary pressure ist = 0.4.

6. Not allowed to use seal washer again.

Type PV48K1008 Max. primary pressure 50 kgf/cm, ( 711 PSI ) Max. back pressure 3 kgf/cm, ( 42 PSI ) Rated flow rate 20 L/min Weight 1.9 kg

HYDRAULIC COMPONENTS7-7 Pilot valve (for Attachment)


3. ConstructionCross sectional view


Code Name Qty.Torque

Nm {kgfm}Code Name Qty.

TorqueNm {kgfm}

101 Casing 1 216-1 Spring seat 1 2 111 Port plate 1 216-2 Spring seat 2 2 121 Seal washer 2 217 Washer 2 (shim) 4 122 O-ring 1 218-1 Spring seat 1 2 125 Socket bolt (M8 x 35) 2 20.6 {2.1} 218-2 Spring seat 2 2 126 Spring pin 1 221-1 Spring 2 131 Bushing 1 221-2 Spring 2 151 Plate 1 241-1 Spring 2 201-1 Spool 2 241-2 Spring 2 201-2 Spool 2 246 Spring 4 211 Plug 4 301 Joing (M14) 1 47 {4.8} 212 Push rod 4 302 Plate 1 213 Seal 4 312 Adjusting nut (M14) 1 69 {7} 214 O-ring (1B P20) 4 501 Boot 1


7-8 Pilot valve (for traveling)1. Appearance

2. Specifications

3. Hydraulic diagram

4. Control curve

Code Port name Size TorqueNm {kgfm}1 Left travel forward port2 Left travel reverse port3 Right travel forward port4 Right travel reverse portT Tank port5 Travel pressure sensor port 6 Travel pressure sensor port P Pilot primary pressure port

PF 3/8

PF 1/4

73.5 5{7.5 0.5}

36.3 2{3.7 0.2}

Model 07291-0000 Primary pressure 50kgf/cm, ( 711 PSI)

Secondary pressure 5.5 ~ 24 kgf/cm, ( 78 ~ 341 PSI ) Rated flow 10 L/min Weight Approx. 11 kg



5. ConstructionHYDRAULIC COMPONENTS

Code Name Qty.Torque

Nm {kgfm}Code Name Qty.

1 Orifice (Shim) 4 22 Spring 4

2 Seat 2 15 {1.5} 24 Plug (PF 1/8) 3 9.8 {1.0}3 Orifice (Shim) 4 25 Plug (PF 1/4) 3 25 {2.5}4 Spool 4 26 Socket bolt (M10 x 60) 2 59 {60}5 Body 1 27 Flange bolt 4 5 {0.5}6 Stopper 4 28 Setscrew (M8) 4 15 {1.5}7 Spring 4 29 Washer 4 8 Spring 4 30 Washer 2 9 Name plate 1 31 Rivet 2

10 Shim (t = 0.2) 4 32 Pin ( 5) 4 11 Shim (t = 0.1) 4 33 Ball 6 12 Cam 2 34 Ball 4 13 Boot 2 35 Ball 4 14 Pin 2 36 Ball 6 15 Cover 2 37 U-packing 4 16 Piston 4 38 O-ring (1A P5) 4 17 Guide 4 39 O-ring (1A P24) 4 18 Sleeve 4 40 O-ring (1A P26) 4 19 Holder 4 41 O-ring (1B P8) 3 20 Ring 12 42 O-ring (1B P11) 3 21 Orifice (Shim) 4 44 Piston Assy 4

Apply Locktite #262 to

TorqueNm {kgfm}

Travel pilot valve


6. OperationsThe pilot valve is made up of the followingsections in the functions.A. Damper sectionB. Reducing valve sectionC. Shuttle section

A. Damper section The primary pressure is fed through the

P port, and flows into the damperchamber through passages (D) and(E).

In addition, the primary pressure isstored in the damper chamber throughthe orifice and check valve.

Then, the air stored in the damperchamber is discharged to T portthrough passages (F) and (G) toprevent the damper performance frominstability due to the entry of air.

If the cam actuates while travelingbecause the oil in the damper chamberis prevented from reversing with thecheck valve, the oil flows to passage(E) through only the orifice section.

The damping operation is performedby the resistance generated when theoil passes through the orifice.

The upper and lower bores of pistonare 12 and 11 respectively, causing thedifference of area, therefore the upwardmoving force always acts on the piston.

Consequently, the cam operation andthe piston on the other side rise due tothe pressure caused by the differenceof area, resulting in the condition whereit follows the cam operation.

Therefore, the damper operation isconstant even the cam is located onany position.



B. Reducing valve(1) At neutral position The primary pressure fed through P port

is blocked by the sealing function on theoutside of spool and the hole on the body.

And, since the secondary pressure port isconnected to the T port through vertical hole(H) at the center section and side hole (I),the pressure is zero.

(2) In operation If the cam inclines in the operating

direction, the piston lowers. Since the cutout (J) on the outside of spool

is connected with the secondary pressureport, the primary pressure fed through Pport flows to the secondary pressure port.

Then, the side hole (I) goes in the hole onthe body and is sealed, and the circuit fromthe secondary pressure port to the T portis blocked.

When the pressure at the secondarypressure port rises higher than the forceof spring for the secondary pressure, thespool is pushed up and the cutout (J) goesin the hole on the body and the passagebetween the primary pressure port and thesecondary pressure port is blocked.

And, side hole (I) is connected with the Tport to release the pressure at thesecondary pressure port to the T port.

By repeating the above procedures, it ispossible to obtain the pressure at thesecondary pressure port which is well-balanced against the load of spring for thesecondary pressure corresponding to thecam operation.

The return spring acts to maintain theproper operating reaction force and tosecurely return the pressure reducing valveto the neutral position.

C. Shuttle section If the pressure is produced on the ports 1

and 3, the ball is pressed against the seat. And, the pressure flows from the port 1 to

the port 5 or port 3 to port 6. Only a little pressure leaks from the ports



7-10 Solenoid/Proportional valve block1. Appearance

2. Specifications

Code Size Torque: Nm {kgfm} P1, P2, T A1 PF 3/8 74 5 { 7.5 0.5} A2 ~ A8 PF 1/4 36 2 {3.7 0.2}

Port


ProportionalSolenoidValves

On/

OFF

On/

OFF

On/

OFF

On/

OFF

Note : A1 ~ A8 are Non - Adjustable

Specifications8KWE5G30 / G24WR804 B

0 ~ 50 kgf/cm {0~711 psi}10 kgf/cm {142 psi} or lower

Sol. valve: 16 L/min,Propo. valve: 10 L/min (per one spool)

Rated voltage DC24V Range of allowable voltage 20.4 ~ 30V Rated power consumption 17W or less (at 24V, 20C) Duty 29V continuous (with surge killer) Coil resistance 34 ~ 40 Rated current 700mA Coil resistance 17.5 (at 20C) Range of secondary press 0 ~ 2.9 MPa {0 ~ 30 kgf/cm} Dither in use 100 Hz/300mAP-P {at 300mA}

Item

Proportional valve - Variable

Type Rated pressure (P port) Allowable back press. (T port)

Max. flow rate

Solenoid valve - ON/OFF


2. Structure

3. Hydraulic diagram


Code Name Qty. Code Name Qty.101 Casing 1 601 Propo. valve (KDRDE5K-31/30C40-101) 4 151 Plug BP1/16 (Meck) 8 701 Sol. valve (KWE5K-31/G24D40) 3 153 Plug BP1/8 (Meck) 1 702 Sol. valve (KWE5K-31/G24Y40) 1 171 Socket bolt (M5 x 12) 16 901 Name plate 1

A1 ~ A8 are Non - Adjustable


7-9 Swivel joint1. Appearance

2. Specifications

3. Construction

Code Name Qty.1 Body 12 Stem 13 Thrust plate 14 Cover 15 Seal assy 56 O-ring 27 O-ring 18 Socket bolt 29 Socket bolt 4

10 Blank plug 1



7-6 Cushioning Mechanism of Cylinder1) Cushioned cylinder

Cushion mechanism is provided so that earth and sand in the bucket does not fall down due toshock produced when extending and retracting piston rod strikes rod cover and cylinder tubewithout reducing the speed. Boom cylinder Rod side Arm cylinder Rod and head side Bucket cylinder Rod side

Operation of cushion mechanism onrod side.

When reaching close to cylinder strokeend, oil in A chamber passes throughpassage B, and flows into tank port (T)at constant speed.

In addition, after piston rod (4) isextended, cushion ring (13) gets into rodcover (14), oil in A chamber is restrictedand passes through passage B and flowsinto tank port (T) resulting in reduction ofpiston speed.

After piston rod (4) extends further,cushion ring (13) gets into rod cover (14)completely, piston speed is reducedwhen oil in a chamber passes throughand piston (5) strikes rod cover (14) thatis, stroke end.

Operation of cushion mechanism onhead side.

When reaching close to cylinder strokeend, oil in a chamber passes throughpassage B, and flows into tank port (T)at constant speed.

In addition, after piston rod (4) isretracted, plunger (4a) gets into cylindertube (1), oil in A chamber is restrictedand passes through passage B and flowsinto tank port (T) resulting in reduction ofspeed.

After piston rod (4) retracts further,plunger (4a) gets into cylinder tube (1)completely, piston speed is reducedwhen oil in A chamber passes through,then piston (5) strikes cylinder tube (1),that is, stroke end.



7-6 Cushioning Mechanism of Cylinder -Cont.


Date post:	01-Oct-2015
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Componentes Hidráulicos (SK210 Y SK330)

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