Document(2).pdf

INTERACTIVE SCHEMATIC Bookmarks

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Cover Page Tables Component Connector

Schematic Machine Views Chassis View Cab View Engine View

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EC-C2 EC-C3

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E-C60 E-C61

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VIEW ALL CALLOUTS EC-C1

Click on any text that is BLUE and underlined. These are hyperlinks that can be used to navigate the schematic and machine views.

When only one callout is showing on a machine view, clicking on this button will make all of the callouts visible. This button is located in the top right corner of every machine view page.

ELECTRICAL SYMBOLS

HOTKEYS (Keyboard Shortcuts)

BASIC HYDRAULIC COMPONENT SYMBOLS

T

FUNCTION Zoom In Zoom Out Fit to Page Hand Tool Find

KEYS “CTRL” / “+” “CTRL” / “-” “CTRL” / “0” (zero) “SPACEBAR” (hold down) “CTRL” / “F”

Pressure Switch

Temperature Switch

Level Switch

Flow Switch

Circuit Breaker

Click here to view the Schematic Symbols and Definitions page

Pump or Motor

Variability

Fluid Conditioner

Spring (Adjustable)

SCHEMATIC SYMBOLS AND DEFINITIONS INTERNAL PASSAGEWAYS

VALVES

ENVELOPES

Two Position

One Position

Three Position

PORTS

Two-way

Three-Way

FLOW IN ONE DIRECTION

FLOW ALLOWED IN EITHER DIRECTION

Infinite Positioning

Two Position

PARALLEL FLOW

PUMPS

Unidirectional

Three Position

Unidirectional

CONTROL AB

AB

P T

P T

Single Acting

Spring Loaded

Fluid Conditioner

Spring (Adjustable)

Spring

Pressure Compensation

Control Valves

Line Restriction (Variable)

Restriction

Line Restriction (Fixed)

Line Restriction Variable and Pressure Compensated

2-Section Pump

Attachment

Pump: Variable and Pressure Compensated

Bidirectional

MOTORS

Double Acting

Infinite Position

CHECK

Basic Symbol

Variability

FIXED DISPLACEMENT

Shifted Position

Normal Position

Pump or Motor

Bidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

CYLINDERS

Four-Way

BASIC HYDRAULIC COMPONENT SYMBOLS

FIXED DISPLACEMENT

CROSS FLOW

ACCUMULATORS

Shuttle

Unidirectional

VARIABLE DISPLACEMENT NON- COMPENSATED

Pilot Controlled

Spring Loaded Gas Charged

Unidirectional

PILOT CONTROL

Bidirectional

ROTATING SHAFTS

RELEASED PRESSURE

External Return

Bidirectional

Unidirectional

Internal Return

Bidirectional

REMOTE SUPPLY PRESSURE

Simplified

Complete

Internal Supply Pressure

Hydraulic Pneumatic Energy Triangles

COMBINATION CONTROLS

Solenoid

Solenoid or Manual

Solenoid and Pilot

Solenoid and Pilot or Manual

MEASUREMENT

LINES

Servo

Thermal

Detent

Crossing

Joining

Manual Shutoff

General Manual

Push Button

Pedal

Spring

Vented

Pressurized

Transducer (Fluid)

Transducer (Gas / Air)

M

Generator

Electric Motor

Flow

Return Above Fluid Level

Return Below Fluid Level

ELECTRICAL SYMBOLS

HYDRAULIC SYMBOLS - ELECTRICAL G

Temperature

Pressure

FLUID STORAGE RESERVOIRS

MANUAL CONTROL

Push-pull Lever

MAIN AUX.

T

Pressure Switch

Pressure Switch (Adjustable)

Temperature Switch

Electrical Wire

Pressure Switch

Temperature Switch

BASIC ELECTRICAL COMPONENT SYMBOLS

Level Switch

Flow Switch

Circuit Breaker

HARNESS AND WIRE SYMBOLS Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).

Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it. Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component.

AG-C4 111-7898 Part Number: for Connector Plug

1

L-C12 3E-5179

2

Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine.

Receptacle Pin or Socket Number

Plug

Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.

Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...) Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...)

Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.

T

Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure. Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay. Solenoid: A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work. Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a permanent magnet. It has two coils (latch and unlatch) that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.

L-C12 3E-5179 5A Fuse (5 Amps)

Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".

9X-1123

Component Part Number

325-AG135 PK-14 Wire Gauge Wire Color

1 2

Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.

1 2

Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.

UENR5188-01 August 2014

303.5E2 CR, 304E2 CR, 305E2 CR, and 305.5E2 CR Mini Excavator Hydraulic System 303.5E2: BG81-UP

304E2: CJ21-UP

305E2: DJX1-UP

305.5E2: EJX1-UP

Volume 1 of 2: Main Hydraulics Volume 2 of 2: Attachments © 2014 Caterpillar, All Rights Reserved

Printed in U.S.A.

COMPONENT TABLE - MAIN HYDRAULICS Component Locations Part Number

Machine Location

Schematic Location

Accumulator Gp - Hydraulic

397-6929

1

D-3

Control Gp - Joystick (LH)

394-9996

2

F-3

Control Gp - Joystick (RH)

394-9996

3

F-1

Core As - Oil Cooler (303.5E2 & 304E2)

380-3496

Core As - Oil Cooler (305E2 & 305.5E2)

378-1259

4

A-6

5

E-4

6

E-5

7

E-7

8

D-4

9

D-5

10

E-4

11

F-5

12

F-7

Description

Cylinder Gp - Angle Blade (303.5E2 & 304E2)

397-6961

Cylinder Gp - Angle Blade (305E2 & 305.5E2)

397-6962

Cylinder Gp - Blade (303.5E2 & 304E2)

397-6963

Cylinder Gp - Blade (305.5E2)

397-6965

Cylinder Gp - Blade (305E2)

397-6964

Cylinder Gp - Boom (303.5E2)

397-6967

Cylinder Gp - Boom (304E2)

397-6968

Cylinder Gp - Boom (305E2 & 305.5E2)

397-6970

Cylinder Gp - Bucket (303.5E2)

397-6978

Cylinder Gp - Bucket (304E2)

397-6979

Cylinder Gp - Bucket (305.5E2)

397-6981

Cylinder Gp - Bucket (305E2)

397-6980

Cylinder Gp - Stick (303.5E2)

397-6983

Cylinder Gp - Stick (304E2)

397-6984

Cylinder Gp - Stick (305.5E2)

397-6986

Cylinder Gp - Stick (305E2)

397-6985

Cylinder Gp - Swing (Boom) (303.5E2 & 304E2)

397-6975

Cylinder Gp - Swing (Boom) (305.5E2 & 305E2)

397-6976

Drive Gp - Travel (LH) (303.5E2 & 304E2)

417-1113

Drive Gp - Travel (LH) (305.5E2)

417-1115

Drive Gp - Travel (LH) (305E2)

417-1114

Drive Gp - Travel (RH) (303.5E2 & 304E2)

417-1113

Drive Gp - Travel (RH) (305.5E2)

417-1115

Drive Gp - Travel (RH) (305E2)

417-1114

Filter Gp - Oil (Return)

421-5424

13

B-6

Fitting Orifice - Travel (LH)

9X-6639

14

A-4

Fitting Orifice - Travel (RH)

9X-6639

15

A-5

Manifold - Drain

293-9743

16

C-1

Manifold - Pilot Pressure

293-9743

17

C-1

Motor Gp - Swing (303.5E2 & 304E2)

266-6396

Motor Gp - Swing (305E2 & 305.5E2)

456-7221

18

F-8

19

B-8

Pump Gp - Main Hydraulic (303.5E2)

442-5649

Pump Gp - Main Hydraulic (304E2)

398-7478

Pump Gp - Main Hydraulic (305E2 & 305.5E2)

423-0089

Sensor Gp - Pressure Switch (Pump) (303.5E2 Only)

344-7391

20

B-8

Strainer As - Hydraulic Tank

262-5689

21

A-8

Swivel Gp - Angle Blade

266-6836

22

E-7

Swivel Gp - Straight Blade (303.5E2 & 304E2)

191-7516

Swivel Gp - Straight Blade (305E2 & 305.5E2)

373-4693

23

E-5

24

A-8

25

C-7

26

D-8

27

C-3

Tank Gp - Hydraulic (303.5E2 & 304E2)

425-5618

Tank Gp - Hydraulic (305E2 & 305.5E2)

425-5615

Valve Gp - Check (Load Sensing) (303.5E2 Only)

359-6658

Valve Gp - Main Control (W/ Angle Blade) (305.5E2 & 305E2)

397-6923

Valve Gp - Main Control (W/ Angle Blade) (303.5E2 & 304E2)

397-6915

Valve Gp - Main Control (W/O Angle Blade) (303.5E2 & 304E2)

397-6913

Valve Gp - Main Control (W/O Angle Blade) (305.5E2 & 305E2)

397-6921

Valve Gp - Pilot (Blade)

438-8361

28

A-3

Valve Gp - Pilot (Travel)

417-1100

29

A-4

Note: Check Part Number In The Part Manual For Your Specific Machine.

COMPONENT TABLE - ATTACHMENTS Component Locations Part Number

Machine Location

Schematic Location

Cylinder Gp - Angle Blade

397-6962

35

E-3

Cylinder Gp - Boom (BLCV) (305E2)

397-6973

Cylinder Gp - Boom (BLCV) (304E2)

397-6972

Cylinder Gp - Boom (BLCV) (305.5E2)

397-6974

Cylinder Gp - Boom (BLCV) (303.5E2)

397-6971

Fitting As - Quick Disconnect (Female)

153-2997

37

E-4

Fitting As - Quick Disconnect (Male)

153-2996

38

E-4

Manifold - Quick Coupler

358-2091

39

B-3

Sensor Gp - Pressure (BLCV)

344-7391

40

B-5

Swivel Gp - Angle Blade

266-6836

41

E-2

Valve As - Ball (1-Way, 2-Way Flow)

362-1008

42

E-6

Valve Gp - Check (BLCV)

437-2876

43

B-4

Valve Gp - Check (SLCV)

417-1105

44

B-6

Valve Gp - Control (Swing Boom, Work Tool)

372-9897

45

D-4

Valve Gp - Main Control (W/ Angle Blade) (305.5E2 & 305E2)

397-6923

Valve Gp - Main Control (W/ Angle Blade) (303.5E2 & 304E2)

397-6915

46

D-8

Valve Gp - Relief (Aux)

421-5455

47

E-7

Valve Gp - Selector (2-Way)

372-9898

48

B-1

Description

Note: Check Part Number In The Part Manual For Your Specific Machine.

B-5 36

B-5 B-5 B-5

TAP TABLE - MAIN HYDRAULICS Tap Locations Pressure, Sampling, and Sensor Tap Number

Description

Schematic Location

AA

Main Pump Pressure

B-8

BB

Load Sensing Pressure (303.5E2 Only)

B-6

PP

Pilot Pressure

D-3

SOS

Oil Sampling Pressure

B-6

8

7 (12) DRIVE GP - TRAVEL (RH) 417-1115 (305.5E2) DR1 417-1114 (305E2) 417-1113 (303.5E2) (304E2)

SWING (18) MOTOR GP SWING 456-7221 (305.5E2) (305E2) 266-6396 (303.5E2) (304E2)

6

5

DR2

DR1

DR2

RED.

3

L2 (SWING LEFT)

F

2

R2 (BUCKET CURL IN)

L4 (SWING RIGHT)

R4 (BUCKET DUMP) (2) CONTROL GP - JOYSTICK (LH) 394-9996

IDENT

PB

PP

DR A

(6) CYLINDER GP - BLADE 397-6965 (305.5E2) 397-6964 (305E2) 397-6963 (303.5E2)(304E2)

A

B

PP

PP

(22) SWIVEL GP - ANGLE BLADE 266-6836

B

T

B

B

D

G

A

C

P

F

E

B

D

G

A

C

P

F

E

P

P

T

(3) CONTROL GP - JOYSTICK (RH) 394-9996

T

RIGHT JOYSTICK

F

R1 (BOOM RAISE) R/H

L1 (STICK IN) L/H

A

1

R3 (BOOM LOWER)

L3 (STICK OUT)

(11) DRIVE GP - TRAVEL (LH) 417-1115 (305.5E2) 417-1114 (305E2) 417-1113 (303.5E2) (304E2)

RED

RED

4

(23) SWIVEL GP - STRAIGHT BLADE 373-4963 (305.5E2)(305E2) 191-7516 (303.5E2)(304E2)

CONNECTOR

2

AUTO DECEL PRESS SW

4

HYD LOCK SOL

5

TRAVEL SPEED SOL

6

SWING BOOM SOL RIGHT

7

SWING BOOM SOL LEFT

8

AUX SOL A

9

AUX SOL B

L1

ARM

L3

L2 6b 1b

6a

SWING

L4

R3 1a

BOOM

2b

R1

R2

R4

BUCKET

2a 7b

7a

E

E

(10) CYLINDER GP - SWING (BOOM) 397-6976 (305.5E2) (305E2) 397-6975 (303.5E2) (304E2)

(7) CYLINDER GP - BOOM 397-6970 (305.5E2)(305E2) 397-6967 (303.5E2) 397-6968 (304E2)

(9) CYLINDER GP - STICK 397-6986 (305.5E2) 397-6985 (305E2) 397-6983 (303.5E2) 397-6984 (304E2)

(26) VALVE GP - MAIN CONTROL (W/ ANGLE BLADE) 397-6923 (305.5E2) (305E2) 397-6915 (303.5E2) (304E2) 1a

SUMP (TO2)

1B

3a

2a 2B 2A

1A

3B

7a

4a 4B

3A

4A

5a

5B 5A

6a

6B 6A

8B 8A

7B 7A

(8) CYLINDER GP BUCKET 397-6981 (305.5E2) 397-6980 (305E2) 397-6978 (303.5E2) 397-6979 (304E2)

(5) CYLINDER GP ANGLE BLADE 397-6962 (305.5E2)(305E2) 397-6961 (303.5E2)(304E2)

(1) ACCUMULATOR GP HYDRAULIC 397-6929

TANK (T) 9B 9A

PORT (ACCU)

10B 10A

TANK (T2)

SUMP (TO)

D

4

D

PILOT SUPPLY (Pp) TRAVEL SPEED (TS)

5

PP

SLEW BRAKE SUPPLY (SBS)

SLEW BRAKE UNLOCK SIGNAL (SBU)

2 (27) VALVE GP - MAIN CONTROL (W/O ANGLE BLADE) 397-6921 (305.5E2) (305E2) 397-6913 (303.5E2) (304E2)

C

8b

LS

END COVER

SWING

BOOM

1b

TRAVEL RIGHT

2b

TRAVEL LEFT

3b

BLADE

4b

5b

STICK

BUCKET

6b

8a

9b

AUX

7b

9a

10b

BOOM SWING

C

10a

ANGLE BLADE

(17) MANIFOLD - PILOT PRESSURE 293-9743

END COVER PILOT BLOCK

LS

BB

(20) SENSOR GP PRESSURE SWITCH (PUMP) 344-7391 (303.5E2 ONLY)

X

X

8

9

(25) VALVE GP - PRESSURE SWITCH (PUMP) 356-6658

7

6

11

10 T5

P5

SOS

X1

P4

P2

P3

P1

T2

T4

T1

T3

LINE PATTERNS

AA

B (19) PUMP GP - MAIN HYDRAULIC (305.5E2) 423-0089 (305E2) 442-5649 (303.5E2) 398-7478 (304E2)

Pressure Line

U1

D1

Pilot / Load Sensing Pressure

303.5E2 PUMP CONFIG.

Component Group

D2

Air Line

U2

CALLOUTS

DL

Callout Number

(Machine Location from Component LocationsTable)

(4) CORE AS - OIL COOLER 378-1259 (305.5E2)(305E2) 380-3496 (303.5E2)(304E2)

S

P

(29) VALVE GP - PILOT (TRAVEL) 417-1100

T

T6 T5 T4 T3

T

T2 T1

8

1

7

6

3a

(FWD)

(BKWD)

3b

2

(15) FITTING ORIFICE - TRAVEL (RH) 9X-6639

5

3

4a 1

(PSW)

(FWD)

4b

4

(14) FITTING ORIFICE - TRAVEL (LH) 9X-6639

4

(52) VALVE GP - CONTROL 138-1234 Part Number

Component Name

PILOT PUMP OUTPUT MAIN PUMP OUTPUT BLADE CONTROL AND BLADE CYLINDER CIRCUIT RIGHT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT ANGLE BLADE CONTROL AND ANGLE BLADE CYLINDER CIRCUIT BOOM SWING CONTROL AND BOOM SWING CYLINDER CIRCUIT SUPPLY LINE STICK CONTROL AND STICK CYLINDER CIRCUIT AUXILIARY LINE CONTROL AND QUICK COUPLER CONTROL CIRCUIT SWING CONTROL CIRCUIT DRAIN / RETURN LINE SWING BREAK CONTROL CIRCUIT SPEED CONTROL CIRCUIT BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT LEFT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT BOOM CONTROL AND BOOM CYLINDER CIRCUIT

P

(BKWD)

Connectors (By letter)

D

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

L2 L1 L

(24) TANK GP - HYDRAULIC 425-5615 (305E2)(305.5E2) 425-5618 (303.5E2)(304E2)

Taps (Pressure, Sampling, Sensor - by letter)

YY DL

(21) STRAINER AS HYDRAULIC TANK 262-5689

B

Drain / Return Lines

B

(13) FILTER GP - OIL (RETURN) 421-5424

A

(16) MANIFOLD - DRAIN 293-9743

(28) VALVE GP - PILOT (BLADE) 2 5b 438-8361

THIS SCHEMATIC IS FOR THE 303.5E2 CR, 304E2 CR, 305E2 CR, AND 305.5E2 CR MINI HYDRAULIC SYSTEM VOLUME 1 of 2: MAIN HYDRAULICS 1 MEDIA NUMBER: UENR5188-01 SCHEMATIC PART NUMBER: 397-6994, CHANGE: 01, VERSION: 5a

2

3

Components are shown installed on a fully operable machine with the key and engine off, with parking brake set. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations. Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.

2

1

A

7

6

4

3

(37) FITTING AS QUICK DISCONNECT (FEMALE) 153-2997

(42) VALVE AS BALL (1-WAY, 2-WAY FLOW) 362-1008

8B 8A

E

5

2

1

(35) CYLINDER GP ANGLE BLADE 397-6962

(38) FITTING AS QUICK DISCONNECT (MALE) 153-2996

I

H

F E

H

F

I

(41) SWIVEL GP - ANGLE BLADE 266-6836

E

E

LOC: VOL 1 (A-2)

5a

10B 10A 5B 5A

215 BAR

215 BAR

275 BAR

(47) VALVE GP - RELIEF (AUX) 421-5455

P C2 C1

T

C4 C3

2 P1

P2 (45) VALVE GP CONTROL (SWING BOOM, WORK TOOL) 372-9897

D 8

9

1

D

B9 A9 LOC: VOL 1 (D-4)

CONTROL VALVE SIDE 8b

8a

BOOM SWING FUNCTION SECOND AUXILIARY FUNCTION (OSJ)

AUX

SOS

D1

U1

LOC: VOL 1 (B-6)

IDENT

D2 C

T6

U2

T5

AUXILIARY LINE

T5

P5

ANGLE BLADE

CONNECTOR

10b

0a

P2

P3

P1

AUX SOL A

9

AUX SOL B

10

ANGLE BLADE RIGHT

11

ANGLE BLADE LEFT

LOC: VOL 1 (F-2) 2a

12

SAFETY SOL

LOC: VOL 1 (F-3) 6b

13

WEDGE SOL

14

OSJ PATTERN CHANGE SOL 1

15

OSJ PATTERN CHANGE SOL 2

10

T2 T1

T4 T3

LOC: VOL 1 (B-1)

BLADE

(46) VALVE GP - MAIN CONTROL (W/ ANGLE BLADE) 397-6923 (305.5E2) (305E2) 397-6915 (303.5E2) (304E2)

8

11

P4

5b

ANGLE BLADE FUNCTION (OSJ)

C

CONTROL VALVE SIDE P1

P2

P4

P3

6a LOC: VOL 1 (F-3) 2b LOC: VOL 1 (F-2)

14

15

(48) VALVE GP SELECTOR (2-WAY) 372-9898

(36) CYLINDER GP BOOM (BLCV) 397-6973

B

B C2

(44) VALVE GP CHECK (SLCV) 417-1105

C2

(40) SENSOR GP PRESSURE (BLCV) 344-7391 M

M

C3

(39) MANIFOLD QUICK COUPLER 358-2091

(43) VALVE GP CHECK (BLCV) 437-2876

C2

P5

LOC: VOL 1 (F-3) L1

P6

R3 LOC: VOL 1 (F-2) L3 LOC: VOL 1 (F-3)

LOC: VOL 1 (F-2) R1

13

TWO WAY PATTERN CHANGE (OSJ) LINE PATTERNS

12

Pressure Line

C1

2

Pilot / Load Sensing Pressure Drain / Return Lines Component Group

T

Air Line

CALLOUTS

BL

A

P8

P7

V2 6B

V2

Pi1 6A

2A 2B 6a

BL

P P PORT

2A

STICK LOWERING CONTROL VALVE (OSJ) 6

BOOM LOWERING CONTROL VALVE (OSJ) 5

4

DL

Callout Number

(Machine Location from Component LocationsTable)

CONTROL VALVE SIDE

QUICK COUPLER (OSJ) 3

Taps (Pressure, Sampling, Sensor - by letter)

YY DL

LOC: VOL 1 (D-7) CONTROL VALVE SIDE

LOC: VOL 1 (D-5) CONTROL VALVE SIDE

7

Pi1

T2

D

Connectors (By letter) (52) VALVE GP - CONTROL 138-1234 Part Number

Component Name

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS PILOT PUMP OUTPUT MAIN PUMP OUTPUT BLADE CONTROL AND BLADE CYLINDER CIRCUIT RIGHT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT ANGLE BLADE CONTROL AND ANGLE BLADE CYLINDER CIRCUIT BOOM SWING CONTROL AND BOOM SWING CYLINDER CIRCUIT SUPPLY LINE STICK CONTROL AND STICK CYLINDER CIRCUIT AUXILIARY LINE CONTROL AND QUICK COUPLER CONTROL CIRCUIT SWING CONTROL CIRCUIT DRAIN / RETURN LINE SWING BREAK CONTROL CIRCUIT SPEED CONTROL CIRCUIT BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT LEFT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT BOOM CONTROL AND BOOM CYLINDER CIRCUIT

THIS SCHEMATIC IS FOR THE 303.5E2 CR, 304E2 CR, 305E2 CR, AND 305.5E2 CR MINI HYDRAULIC SYSTEM VOLUME 2 of 2: ATTACHMENTS MEDIA NUMBER: UENR5188-01 SCHEMATIC PART NUMBER: 397-6994, CHANGE: 01, VERSION: -

Components are shown installed on a fully operable machine with the key and engine off, with parking brake set. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations. Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.

2

1

A

MACHINE RIGHT SIDE VIEW VIEW ALL CALLOUTS

24 4

21 13 SOS PP

25 BB

26 27

1

10

MACHINE LEFT SIDE VIEW VIEW ALL CALLOUTS

9

8

7 5

6

12 11 AA

20

19

CAB TOP VIEW VIEW ALL CALLOUTS

2 3 16

28

29 17 22 23

15

14 18

RIGHT SIDE BOOM VIEW VIEW ALL CALLOUTS

40 37

44

MACHINE RIGHT SIDE VIEW VIEW ALL CALLOUTS

46 42

47

45

MACHINE LEFT SIDE VIEW VIEW ALL CALLOUTS

43

38

36 35

CAB TOP VIEW VIEW ALL CALLOUTS

48

41

39