User Manual

ManualsBrandsCaterpillar ManualsOtherCaterpillar 444E Blackhoe Loader Hydraulic system

KENR8230-01

30 Page, (Dimensions: 39 inches x 28 inches)

ONE POSITION

TWO POSITION

THREE POSITION

VENTED

PRESSURIZED

RETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

LINES CROSSING

LINES JOINING

TWO-WAY

THREE-WAY

FOUR-WAY

SPRING

CONTROL VALVES

RESTRICTION

LINE RESTRICTION

(FIXED)

2-SECTION PUMP

MAIN

AUX.

SPRING

(ADJUSTABLE)

VARIABILITY

LINE RESTRICTION

(VARIABLE)

LINE RESTRICTION

VARIABLE and PRESSURE

COMPENSATED

PRESSURE

COMPENSATION

PUMP: VARIABLE and

PRESSURE COMPENSATED

ENERGY TRIANGLES

HYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE

TEMPERATURE

FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES

VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONER

PUMP or MOTOR

FLUID POWER SYMBOLS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

EXTERNAL RETURN

INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED

COMPLETE

INTERNAL

SUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED

GAS CHARGED

SOLENOID

or MANUAL

SOLENOID

and PILOT

SOLENOID and

PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID

SERVO

THERMAL

DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTING

SINGLE ACTING

BASIC

SYMBOL

SPRING

LOADED

CHECK VALVES

TWO

POSITION

INFINITE

POSITIONING

FLOW IN ONE

DIRECTION

FLOW ALLOWED IN

EITHER DIRECTION

THREE

POSITION

CROSS

FLOW

PARALLEL

FLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

SHIFTED POSITION

INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOT

CONTROLLED

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit Identification

Number

Wire Color

Wire Gauge

Harness identification code

This example indicates

wire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit Number

Identification

Wire Number Identification Codes

Current Standard

Previous Standard

Electrical Schematic Example

Hydraulic Schematic Example

325-PK

Wire Color

Circuit Number

Identification

Wire

(EXAMPLE VALVE)

Current Standard

Transducer

(Fluid)

Transducer

(Gas / Air)

Generator

Electrical Wire

Pressure Switch

Electric Motor

Pressure Switch

(Adjustable)

Temperature Switch

Pressure

Symbol

Temperature

Symbol

Level

Symbol

Flow

Symbol

Electrical Symbols (Electrical)

2008 Caterpillar

Printed in U.S.A.

KENR8230-01

December 2008

432E, 434E, 442E, and 444E

Hydraulic System

432E:

BXE2200-UP

434E:

FSH900-UP

442E:

GKZ600-UP

444E:

LBE600-UP

Backhoe Loaders

COMPONENT LOCATIONS

192021

202127

Tap Description

T1 Pump Discharge

T2 Load Sense

SOS Oil Sampling

TAP LOCATIONS

BACKHOE VALVE

The “E” series machines are equipped with a pilot controlled backhoe valve that is

visible with the floor plate at the rear of the cab removed.

This illustration shows a seven bank backhoe valve in a 432E Backhoe Loader.

SOS

Implement and

Steering Pump

HYDRAULIC OIL FILTER

SOS

Filter Bypass Switch

The 432E/434E/442E and 444E machines are all

equipped with the pilot controlled loader valve as

shown in this illustration.

The loader valve is accessed from below the floor

plate. The loader control valve group contains:

LOADER VALVE

27 28

Travel at high speeds over rough terrain causes bucket movement. The

optional Ride Control System acts as a shock absorber by absorbing

bucket forces, which stabilize the machine.

The Ride Control System components include; ride control relay (A), ride

control solenoids (B), ride control accumulator (C), and ride control

pressure switch (D).

Two solenoids are now used on the "E" Series machines Ride Control

System.

The Ride Control System, on machines with the optional autoshift

transmission, is controlled by the Machine ECM. The Machine ECM

monitors the position of the ride control switch and determines when to

operate the ride control system.

RIDE CONTROL

IMPLEMENT / STEERING PUMP

The implement and steering pump on the

432E, 434E, 442E and 444E machines is

similar to the "D" Series machines, but now

includes a torque control solenoid (not

visible). The torque control solenoid provides

an additional pump setting.

The implement and steering pump is located

below the floor plate in the cab. The pump

control valve (H) contains a torque control

spool adjustment screw (B) and a flow com-

pensator adjustment screw (A). The adjust-

ment screws and the load sensing pressure

tap (T2) are accessible from the cab.

Implement and

Steering Pump

View of mechanically controlled loader valve with floor plate removed.

Loader Valve

These illustrations show the implement and steering pump out of the machine. The following components are visible:

Torque control adjustment (A), Flow compensator adjustment (B), Load sensing pressure tap (T2), Inlet port (C),

Case drain port (D), Torque control solenoid (E), Discharge pressure tap (T1), Torque limiter (F), Outlet port (G)

THREE BANK VALVE (PILOT OPERATED)

The 432E, 434E, 442E and 444E machines are equipped with hydraulically assisted master cylinders,

which decreases the amount of pedal effort when braking. This illustration shows the boosted brakes

valve group, which uses oil from the pilot accumulator to add boost to the master cylinder. The hydraulic

force multiplies the pedal effort so the operator can get more braking force with less effort.

The brake boost valves are connected to the master cylinder (A) at each brake pedal (B). Oil enters

the master cylinder through the supply hose (C) and exits the master cylinder through the return hose

(D). The oil flows to the service brakes through the hoses (E) at the bottom of the master cylinder.

The master cylinders can be removed from the machine from inside the operator's compartment.

This illustration shows a sectional view of the boosted brake valve group. When the brake pedal is

depressed, the boost brake valve moves to the left and inlet oil from the pilot manifold is directed

to the master cylinder.

BOOSTED BRAKES

Drain

SEVEN BANK VALVE

For other bank valve configurations see RENR6487 (Specifications Manual).

For other bank valve configurations

see RENR6487 (Specifications Manual).

SIDESHIFT

The pilot manifold can also be

accessed with the floor plate

removed. The pilot pressure tap

(T3) is located on the pilot mani-

fold. The pilot manifold routes pilot

oil to and from the loader and

backhoe pilot control valves.

Pilot Manifold

View of pilot controlled backhoe valve with floor plate removed.

The hydraulic oil filter is located below the

machine at the left frame rail. The hydraulic oil

filter bypass switch is mounted to the oil filter

base.

Outlet manifold (A) Solenoid for the A circuit (H)

Auxiliary control valve (B) Makeup and relief valve (J)

Tilt control valve (C) B pilot line port (K)

Lift control valve (D) A pilot line port (L)

Inlet manifold (E) Priority Valve (M)

Load sensing relief valve (F) Dead engine lower valve (N)

Solenoid for the B circuit (G) A ports

(P)

B ports (R)

SOS

ECM

Loader Valve

"E" Series sideshift machines have a new slide frame with new externally serviceable slide frame

lock cylinders and reversible/replaceable wear plates (C). The lock cylinders can be serviced in the

field with standard tools. The stabilizers (D) are now externally adjustable. A powered sideshift

(bottom right illustration) is available, which allows the operator to hydraulically shift the backhoe

across the slider.

This illustration shows the optional powered sideshift attachment. The powered sideshift moves the

backhoe across the slider using two hydraulic cylinders (A). Wear pads (B) on the slider and powered

sideshift assembly are serviceable.

To Wheel

Brake

Boost Brake

Valve

From Pilot

Accumulator

To Tank

Master

Cylinder

Slave

Cylinder

ABEDC

T3 Pilot Pressure

19 20 21

NOTE: Alpha numeric numbers are represented by the number only on the machine views.

22 25 26

25 26

Hydraulic Oil Filter

Temp Sensor

Filter Bypass

Switch

Temp Sensor

ITEM NAME 432E 434E

1 PUMP GP.

289-6370

2 HYDRAULIC TANK

246-5286

3 TANK GROUP

245-8777

4 COOLER

HYDRAULIC COOLER

5 FILTER

226-9747

6 HMU

210-6240

STEER CYLINDERS

7A FRONT

REAR

8 LIFT CYLINDERS 214-9373

9 TILT CYLINDERS 192-3884

MP BUCKET CYL.(OPT)

STABILIZER CYLINDERS

11A LH

173-4565

11B RH

173-4565

12 BOOM CYLINDER

268-9049(S)

210-7076

268-9051(S)

246-9884

13 STICK CYLINDER

14 SWING CYLINDER

278-1971

15 BUCKET CYLINDER

210-7085(S)

210-7086

210-7095(S)

210-7096

16 E-STICK CYLINDER (OPT).

210-7097(S) / 210-7089

VALVE PILOT

17A VALVE PILOT (SWITCH)

297-4394

17B VALVE PILOT (SWITCH+DETENT)

297-4395

18 ACCUMULATOR

226-0420

19 RIDE CNTRL VALVE (OPT)

245-8780

20 RIDE CNTRL ACCMLTR (OPT)

162-3960

21 RIDE CNTR PRES. SWTCH(OPT)

131-9203

22 TEMP. SENSOR (OPT)

TEMP SENSOR

23 DIFF. PRES. SWITCH (OPT)

134-0404

25 COUPLER VALVE (See Volume 2)

231-2615

26 COUPLER CYLINDER (See Volume 2)

190-3085

LOADER VALVE (PL/IT) 3 BANK

LIFT SECTION

308-2157

TILT SECTION

308-2163

27C AUX SECTION

308-2159

27D INLET SECTION

PATTERN SWITCH VALVE

VALVE GP - CUSHION RELIEF (OPT)

32 VALVE GP - PILOT (BACKHOE)

VALVE GP - PILOT (LOADER)

267-2760

PRV MANIFOLD

300-4493

PO CHECK VALVE

308-3437

36 CHECK VALVE ADAPTER

165-7948

N/A

269-1083

COMPONENT LIST

24 ALL WHEEL STEER VALVE

442E 444E

249-6710 LH

249-6711 RH

249-6712 LH

249-6713 RH

210-7101 214-9372

268-9049(S)

210-7076

268-9051(S)

246-9884

210-7083(S)

210-7084

210-7093(S)

210-7094

210-7083(S)

210-7084

210-7093(S)

210-7094

256-3089 (OPT) 256-3089 (STD)

210-7085(S)

210-7086

210-7095(S)

210-7096

N/A

300-4491

206-3685

267-2758

N/A

MP BUCKET CYL.

LOADER VALVE (EST) 3 BANK

28 LOADER VALVE (3 BANK)

N/A

28A INLET SECTION

308-2156

293-8702

27A

27B

27 LOADER VALVE (3 BANK)

269-1081

N/A

28B TILT SECTION

308-2158

N/A

BACKHOE VALVE (SS) 7 BANK

29 BACKHOE VALVE (SS) 7 BANK

293-8701

29A BOOM SECTION

308-2149

29B STICK SECTION

308-2152

29C E-STICK SECTION

308-2153

29D OUTLET SECTION

308-2154

29E INLET MANIFOLD

308-2147

29F STABILIZER SECTION

308-2148

29G SWING SECTION

308-2150

29H BUCKET SECTION

308-2151

ITEM

VALVE

P1 LS RELIEF LOADER

P2 LS RELIEF BACKHOE

P3 HMU LS RELIEF

P4 TILT RE

P5 TILT HE

P6 LOADER AUX HE

P7 BUCKET RE & HE

P8 BOOM HE

P9 BOOM RE

P10a STICK HE

P10b STICK RE

P11 SWING RE + HE

P12 E-STICK RE + HE

P13 BACK PRESSURE CHECKVALVE

P14 FILTER BYPASS

P15 COOLER BYPASS

P16 STEERING CYL. RELIEF

P17 REAR WHEEL LINE RELIEF

P18 FLUSHING / MARGIN RELIEF

PR1 PILOT PRESSURE REDUCING

R1 LS DRAIN REGULATOR

LINE MAKE-UP/

RELIEF VALVE

STAB

BOOM

SWING

STAB

BUCKET

STICK

E-STICK

TANK (PLUGGED)

GAUGE

(PLUGGED)

SIDESHIFT CLAMP

SOLENOID VALVE

M14x2

SIDESHIFT CLAMP

M14x2

PUMP

(PLUGGED)

TANK

(LS DRAIN)

LOAD SENSE

RELIEF VALVE

LOAD

SENSE