sistema hidraulico

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INTERACTIVE SCHEMATIC
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Bookmarks X
EC-C3
EC-C2 E-C60
EC-C1
E-C61
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FUNCTION
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KEYS
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Find “CTRL” / “F”
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
(Adjustable)
Variability
Fluid
Conditioner
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
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2. SCHEMATIC SYMBOLS AND DEFINITIONS
HYDRAULIC SYMBOLS - ELECTRICAL
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator Electrical
Wire
Pressure
Switch
M
Electric
Motor
Pressure Switch
(Adjustable)
Temperature
Switch
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
Control
Valves
Restriction Line Restriction
(Fixed)
2-Section
Pump
MAIN AUX.
Spring
(Adjustable)
Variability
Line Restriction
(Variable)
Pressure
Compensation
Pump: Variable and
Pressure Compensated
Hydraulic Pneumatic
Energy Triangles
Fluid
Conditioner
Attachment
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
Line Restriction
Variable and Pressure
Compensated
Vented Pressurized Return Above Fluid Level Return Below Fluid Level
FLUID STORAGE RESERVOIRS
Pressure Temperature Flow
MEASUREMENT
Unidirectional Bidirectional
ROTATING SHAFTS
One Position Two Position Three Position
Two-way Three-Way Four-Way
ENVELOPES
PORTS
CONTROL
Basic
Symbol
Spring
Loaded
Normal Position
A B
P T
A B
P T
Shifted Position Infinite Position
Shuttle Pilot
Controlled
VALVES
CHECK
Solenoid
or Manual
Solenoid
and Pilot
Solenoid and
Pilot or Manual
Solenoid Servo Thermal Detent
COMBINATION CONTROLS
T
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.
Ground (Wired): This indicates that the component is connected to a grounded wire.
The grounded wire is fastened to the machine.
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
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.
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.
BASIC ELECTRICAL COMPONENT SYMBOLS
Push-pull Lever PedalGeneral Manual Push Button SpringManual Shutoff
MANUAL CONTROL
External Return Internal Return
Simplified Complete
Internal
Supply Pressure
RELEASED PRESSURE
REMOTE SUPPLY PRESSURE
PILOT CONTROL
Spring Loaded Gas Charged
ACCUMULATORS
Crossing Joining
LINES
Double ActingSingle Acting
CYLINDERS
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
PUMPS
Unidirectional
Bidirectional
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
MOTORS
Unidirectional
Bidirectional
Two
Position
Infinite
Positioning
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
Three
Position
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
1
2
AG-C4
111-7898
L-C12
3E-5179
9X-1123
Component
Part Number
Pin or Socket Number
Part Number: for
Connector Plug
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)
Plug
325-AG135 PK-14
Wire Color
Wire Gauge
Receptacle
1
1
2
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the receptacle contains all pins.
Fuse (5 Amps)
5A
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
L-C12
3E-5179
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Harness Connector Serialization Code: The "C" stands for
"Connector" and the number indicates which connector in the
harness (C1, C2, C3, ...)
HARNESS AND WIRE SYMBOLS

3. UENR4731
June 2013
Printed in U.S.A.© 2013 Caterpillar, All Rights Reserved
242D:
A9W1-UP
262D:
KTS1-UP
279D:
PPT1-UP
246D:
HMR1-UP
257D:
EML1-UP
287D:
STK1-UP
289D:
WCT1-UP
236D:
MPW1-UP
259D:
GTK1-UP
277D:
MLT1-UP
236D, 242D, 246D, and 262D
Skid Steer Loader
257D, 277D, and 287D
Multi-Terrain Loader
259D, 279D, and 289D
Compact Track Loader
Hydraulic System

4. COMPONENT TABLE
Description Models
Part
Number
Machine
Location
Schematic
Location
Accumulator GP All Models 227-8807 1 A-4
Accumulator GP - Ride Control All Models 310-8460 2 F-7
Breather - Hydraulic Tank All Models 258-2829 3 C-7
236D 378-0891
242D/257D/259D 380-5668
246D/277D/279D 375-7845
262D/287D/289D 377-9483
236D/242D/257D/259D 378-7964
246D/262D 358-5007
246D/262D/277D/279D/287D/289D 293-5712
236D/242D/257D/259D 378-7963
246D/262D 358-5007
246D/262D/277D/279D/287D/289D 293-5711
Filter AS - Hydraulic and Transmission Oil All Models 346-5576 7 F-11
388-7960
345-5165
Manifold GP - Pilot Shutoff (Two Speed) All Models 359-7222 B-4
Manifold GP - Ride Control All Models 345-4755 10 F-7
Motor GP - Hydraulic Man (Demand) All Models 258-2577 11 F-10
Motor GP - Hydraulic Fan (Standard) 236D/242D/257D/259D 307-3036 12 G-10
358-5009
358-5003
Motor GP - Hydrostat (Two Speed) (LH) 236D/242D 358-5011 14 E-15
Motor GP - Hydrostat (Two Speed) (RH) 236D/242D 358-5013 15 E-13
257D Only 373-8424
259D Only 373-8470
277D/279D/287D/289D 373-8422
279D/289D 373-8423
236D/242D/257D/259D 258-2405
All Other Models 341-7625
373-8426
358-5002
246D/262D/277D/279D/287D/289D 423-0086
236D/242D/257D/259D 358-5002
246D/262D/277D/279D/287D/289D 423-0086
299D XHP 341-7635
236D/242D/257D/259D 258-2555
All Other Models 358-5010
236D/242D/257D/259D 345-3609
All Other Models 345-3473
Strainer AS - Hydraulic Tank All Models 262-5689 21 C-8
Tank GP - Hydraulic All Models 345-4581 22 C-8
Valve GP - Check (Cooler Bypass) All Models 373-7039 23 A-15
Valve GP - Check (Ride Control) All Models 304-6756 24 E-7
All Models 373-6954
246D/262D/277D/279D/287D/289D 373-6956
Valve GP - Implement Control (High Flow) All Models 373-6959 26 H-6
Valve GP - Loader Arms Manual Lower All Models 112-1817 27 F-3
*If model is not listed that component will not be found on that machine
Radiator and Hydraulic Oil Cooler GP 20 A-10
236D/242D/257D/259D
All Models
Motor GP - Hydrostat (One Speed) 13 I-14236D/242D
Cylinder GP - Lift 4 F-3
Cylinder GP - Tilt (LH) 5 F-4
Fitting GP - Quick Coupler
G-12
19
19
Pump GP - Hydrostat 17 A-13
Pump GP - Implement and Charge (Standard Flow) 18
Cylinder GP - Tilt (RH) 6 F-4
Valve GP - Implement Control (Standard Flow) 25 E-4
Component Locations
Pump GP - Implement and Charge (High Flow) E-10
C-10Pump GP - Work Tool
E-2
Motor GP - Hydrostat (Two Speed)
B-10
8
9
16

5. TAP TABLE
Tap
Number
Description
Schematic
Location
AA Implement Pump Pressure D-5
AA Implement Pump Pressure G-3
EE Charge Pressure A-14
MA Main System Pressure (Pump 2 Reverse) A-13
MB Main System Pressure (Pump 2 Forward) C-13
MC Main System Pressure (Pump 1 Forward) C-14
MD Main System Pressure (Pump 1 Reverse) A-14
SOS Oil Sampling F-11
Tap Locations
Pressure and Sampling

6. UENR4731
42Page,(Dimensions:56inchesx35inches)
Components are shown installed on a fully operable machine with the key and engine off and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
SCHEMATIC PART NUMBER: 345-5170, CHANGE: 01, VERSION: -
259D, 279D, AND 289D COMPACT TRACK LOADER HYDRAULIC SYSTEM
MEDIA NUMBER: UENR4731
Note: Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.
257D, 277D, AND 287D MULTI-TERRAIN LOADER
THIS SCHEMATIC IS FOR THE 236D, 242D, 246D, AND 262D SKID STEER LOADER
A
B
C
D
E
F
1234567891011121314
G
H
I
J
A
B
C
D
E
F
G
H
I
J
1516
12345678910111213141516
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
MAIN PUMP OUTPUT
TILT CYLINDER CIRCUIT
CHARGE PUMP OUTPUT
HYDRAULIC FAN CIRCUIT
LOAD SENSE CIRCUIT
SUPPLY LINE
QUICK COUPLER CIRCUIT
DRAIN / RETURN LINE
STEERING CIRCUIT
TRAVEL CONTROL CIRCUIT
LIFT CYLINDER CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
Air Line
Tap
Number
Description
Schematic
Location
AA Implement Pump Pressure D-5
AA Implement Pump Pressure G-3
EE Charge Pressure A-14
MA Main System Pressure (Pump 2 Reverse) A-13
MB Main System Pressure (Pump 2 Forward) C-13
MC Main System Pressure (Pump 1 Forward) C-14
MD Main System Pressure (Pump 1 Reverse) A-14
SOS Oil Sampling F-11
Tap Locations
Pressure and Sampling
STANDARD FAN
DEMAND FAN
RIDE CONTROL
TWO SPEED HYDROSTAT MOTORS 236D/242D
STANDARD FLOW
HIGH FLOW
TWO SPEED
PILOT SHUTOFF
STANDARD FLOW IMPLEMENT PUMP
WORK TOOL PUMP
TWO SPEED HYDROSTAT MOTORS 257D/259D/277D/287D/279D/289D/299D XHP
ONE SPEED HYDROSTAT MOTORS 236D AND 242D
AA
AA
EE MAMD
MC MB
SOS
(17) PUMP GP
HYDROSTAT
(23) VALVE GP
CHECK (COOLER BYPASS)
(18) PUMP GP
IMPLEMENT AND CHARGE (STANDARD FLOW)
(19) PUMP GP
WORK TOOL
(20) RADIATOR AND HYDRAULIC OIL COOLER GP
(21) STRAINER AS
HYDRAULIC TANK
(22) TANK GP
HYDRAULIC
(3) BREATHER
HYDRAULIC TANK
(1) ACCUMULATOR GP
(7) FILTER AS
HYDRAULIC AND TRANSMISSION OIL
(12) MOTOR GP
HYDRAULIC FAN (STANDARD)
(11) MOTOR GP
HYDRAULIC FAN (DEMAND)
(10) MANIFOLD GP
RIDE CONTROL
(24) VALVE GP
CHECK (RIDE CONTROL)
(2) ACCUMULATOR GP
RIDE CONTROL
(27) VALVE GP
LOADER ARMS MANUAL LOWER(5) CYLINDER GP
TILT (LH)
(6) CYLINDER GP
TILT (RH)
(4) CYLINDER GP
LIFT
(25) VALVE GP
IMPLEMENT CONTROL (STANDARD FLOW)
(14) MOTOR GP
HYDROSTAT (TWO SPEED) LH
(15) MOTOR GP
HYDROSTAT (TWO SPEED) RH
(9) MANIFOLD GP
PILOT SHUTOFF (TWO SPEED)
(16) MOTOR GP
HYDROSTAT (TWO SPEED)
(26) VALVE GP
IMPLEMENT CONTROL (HIGH FLOW)
QUICK COUPLER
(8) FITTING GP
QUICK COUPLER
(13) MOTOR GP
HYDROSTAT (ONE SPEED)
258-2405 (236D/242D/257D/259D)
341-7625 (ALL OTHER MODELS)
373-7039 (ALL MODELS)
373-8426 OR 358-5002 (236D/242D/257D/259D)
423-0086 (246D/262D/277D/279D/287D/289D)
258-2555 (236D/242D/257D/259D)
358-5010 (ALL OTHER MODELS)
345-3609 (236D/242D/257D/259D)
345-3473 (ALL OTHER MODELS)
262-5689 (ALL MODELS)
345-4581(ALL MODELS)
258-2829 (ALL MODELS)
227-8807 (ALL MODELS)
346-5576 (ALL MODELS)
307-3036 (236D/242D/257D/259D)
258-2577 (ALL MODELS)
345-4755 (ALL MODELS)
304-6756 (ALL MODELS)
310-8460 (ALL MODELS)
112-1817 (ALL MODELS)
378-7964 (236D/242D/257D/259D)
358-5007 (246D/262D)
293-5712 (ALL OTHER MODELS)
378-7963 (236D/242D/257D/259D)
358-5007 (246D/262D)
293-5711 (ALL OTHER MODELS)
378-0891 (236D)
380-5668 (242D/257D/259D)
375-7845 (246D/277D/279D)
377-9483 (262D/287D/289D)
373-6954 (ALL MODELS) OR
373-6956 (245D/262D/277D/279D/287D/289D)
358-5011 (236D/242D)
358-5013 (236D/242D)
359-7222 (ALL MODELS)
373-8424 (257D ONLY)
373-8470 (259D ONLY)
373-8422 (277D/297D/287D/289D)
373-8423 (279D/289D)
373-6959 (ALL MODELS)
LIFT CYLINDERS
LOADER ARMS MANUAL LOWER VALVE
LH TILT CYLINDER RH TILT CYLINDER
MBBAX7DCMC
MAEMD L1 L3
I
A
Y
R
X
CI CO
L2
FO FI
FmIFmO
FmIFmO
Pg
T
RT
P
H
1A 1B 2A 2B 3A 3B
LS
M
P
T
B1
A1
L1L2
PPg T
T0 Ls Pp A BA BA B
XB
B1
B1B
M3
C
D
X7
A
B
I
A
Y
R
X
C
LOC C-14
D
LOC C-14
X7
LOC C-13
A
LOC C-13
B
LOC C-13
STANDARD FAN
DEMAND FAN
STANDARD
FAN
DEMAND FAN
WORK TOOL PUMP
STANDARD FLOW IMPLEMENT PUMP
WORK TOOL PUMP
STANDARD FLOW IMPLEMENT PUMP
WORK TOOL PUMP
STANDARD FLOW IMPLEMENT PUMP
TWOSPEEDHYDROSTATMOTOR(236D/242D)
TWOSPEEDHYDROSTATMOTOR(OTHERMODELS)
TWOSPEEDHYDROSTATMOTOR(236D/242D)
TWOSPEEDHYDROSTATMOTOR(OTHERMODELS)
STANDARDFAN
DEMANDFAN
XHP HIGH FLOW
IMPLEMENT CONTROL VALVE
STANDARD FLOW
IMPLEMENT CONTROL VALVE
XHP HIGH FLOW
IMPLEMENT CONTROL VALVE
STANDARD FLOW
IMPLEMENT CONTROL VALVE
XHPHIGHFLOW
IMPLEMENTCONTROLVALVE
STANDARDFLOW
IMPLEMENTCONTROLVALVE
XHPHIGHFLOWIMPLEMENTCONTROLVALVE
STANDARD FLOW
IMPLEMENT CONTROL VALVE
STANDARD FLOW IMPLEMENT CONTROL VALVE
XHP HIGH FLOW IMPLEMENT CONTROL VALVE
STANDARD FLOW IMPLEMENT CONTROL VALVE
XHP HIGH FLOW IMPLEMENT CONTROL VALVE
XHPHIGHFLOW
IMPLEMENTCONTROLVALVE
STANDARDFLOW
IMPLEMENTCONTROLVALVE
XHP HIGH FLOW IMPLEMENT CONTROL VALVE
STANDARD FLOW IMPLEMENT CONTROL VALVE
388-7960 (ALL MODELS)
345-5165 (ALL MODELS)
358-5003 OR 358-5009 (236D/242)
L
R
X
I
2
L
R
X
I
2
C
LOC C-14
D
LOC C-14
X7
LOC C-13
A
LOC C-13
B
LOC C-13

7. RIGHT SIDE VIEW
MCMB
AA
27
2625
24
22
21
15
14
10
9
4
4
3
2
1
VIEW ALL CALLOUTS

8. REAR VIEW
SOS
MDMAEE 23
20
17
16 16
1211
7
VIEW ALL CALLOUTS

9. FRONT VIEW
19
18
13
8
6 5
VIEW ALL CALLOUTS