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JCB 3CX, 4CX, 214e, 214, 215, 217 & VARIANTS Backhoe Loader. Service Manual - page 3

Section 3

Routine Maintenance

Section 3

26 - 1

Air Conditioning (if fitted)

26 - 1

! WARNING

The air conditioning system is a closed loop system and

contains pressurised refrigerant. No part of the system

should be disconnected until the system has been

X

discharged by a refrigeration engineer or a suitably

trained person. You can be severely frostbitten or injured

by escaping refrigerant.

A

B

4-3-4-1/2

Adjusting the Compressor Drive Belt

! WARNING

Make sure the engine cannot be started. Disconnect the

battery before doing this job.

2-3-3-5

1

Park the machine on firm level ground, engage the

parking brake and set the transmission to neutral. Raise

and block the loader arms. Lower the backhoe to the

C

ground and stop the engine.

S209393

2

Loosen bolts A, B and C. Position the compressor so

that there is 10 mm (3/8 in) slack at point X.

3

Tighten bolt A, then bolts B and C.

9803/3280

Issue 1

Section 3

Routine Maintenance

Section 3

27 - 1

Hose Burst Protection Valve (if fitted)

27 - 1

The hose burst protection valves (if fitted) prevent the loader

Lowering a Load

or backhoe falling in the event of a hose burst. These valves

may be fitted on rams which raise or lower the loader arms,

During normal operation, the engine must be running before

the boom or the dipper.

a load can be lowered. The following paragraphs describe

how to safely and correctly lower a load in the event of

Checking Hose Burst Protection Valve

engine failure or a hose burst; we recommend that only a

competent maintenance engineer perform the procedures.

1

Raise the loader arms fully. Raise the boom to about

45°. Raise the dipper to the horizontal.

After lowering a load do not use the machine until the

manual over-ride screw has been reset (Loader HBPV) or a

new end cap and valve assembly fitted (Boom HBPV) by a

2

Stop the engine.

qualified engineer, otherwise the valve will not operate as

intended.

3

Using the control levers, try to lower the loader, boom

and dipper. Push the levers fully to the 'lower' position.

! DANGER

If there is any movement, get the hydraulic system

Do not stand underneath the raised load during the

checked by your JCB distributor.

lowering procedure. Stand clear and to one side until the

load has been safely lowered. Make sure that the area is

clear of other people before lowering the load. If you do

not follow these precautions you or others could be

killed or seriously injured.

2-3-5-3

Boom and Dipper Hose Burst Protection Valve (HBPV)

S320930

1

Remove cap A and pierce the warning label.

2

If a hose has burst, position a suitable container to

catch the oil.

A

3

Insert a 6mm allen key into the socket head of screw B.

Slowly turn the allen key in a clockwise direction until

the load just begins move.

C

Burst hose - Lower the boom using screw B, turn the

screw counter-clockwise to slow or stop the load from

lowering.

D

Dead engine - Operate the control lever in the cab to

lower the load.

S170582

Loader Hose Burst Protection Valve (HBPV)

1

Remove cap C from both HBPV check valves on the

loader lift arms.

2

If a hose has burst, position a suitable container to

catch the oil.

B

3

On the burst hose HBPV, insert a 5mm allen key into

the socket head of screw D. Turn the allen key in a

clockwise direction so that the screw winds fully in.

Repeat slowly for the opposite side as the load is now

supported on this HBPV.

Note: Count the number of full turns on each screw for

resetting purposes.

A171340

4

Operate the control lever in the cab to lower the load.

9803/3280

Issue 1

www.WorkshopManuals.co.uk_{Section B}

Section B

Body & Framework

1 - 1

Service Tools

1 - 1

Cartridge Gun - hand operated - essential for the

application of sealants, polyurethane materials etc.

JCB part number

-

892/00845

Hand Cleaner - special blend for the removal of

polyurethane adhesives.

JCB part number - 4104/1310

(454g; 1 lb tub)

S186240

S186270

Folding Stand for

Holding

Glass

-

essential for preparing

new glass prior to

installation.

12V Mobile Oven - 1 cartridge capacity - required to

JCB part number

-

pre-heat adhesive prior to use. It is fitted with a male

892/00843

plug (703/23201) which fits into a female socket

(715/04300).

JCB part number - 992/12300

S186250

S186280

240V Static Oven - available with 2 or 6 cartridge

Glass Lifter - minimum 2 off - essential for glass

capacity - required to pre-heat adhesive prior to use.

installation, 2 required to handle large panes of glass.

No plug supplied. Note: 110V models available upon

Ensure suction cups are protected from damage

request - contact JCB Technical Service.

during storage.

JCB part number:

JCB part number - 892/00842

992/12400 - 2 Cartridge x 240V

992/12600 - 6 Cartridge x 240V

S186300

S186260

9803/3280

Issue 1

www.WorkshopManuals.co.uk_{Section B}

Section B

Body & Framework

1 - 2

Service Tools

1 - 2

Wire Starter - used to access

braided cutting wire (below)

through original polyurethane

seal.

Cut-Out Knife - used to remove

broken glass.

JCB part number - 992/12800

JCB part number - 892/00848

S186340

S186310

'L' Blades - 25 mm (1 in) cut - replacement blades for

cut-out knife (above).

JCB part number - 992/12801 (unit quantity = 5 off)

Glass Extractor (Handles) - used with braided cutting

wire (below) to cut out broken glass.

JCB part number - 892/00846

S186320

S186350

Long Knife - used to give extended reach for normally

Braided Cutting Wire - consumable heavy duty cut-out

inaccessible areas.

wire used with the glass extraction tool (above).

JCB part number - 892/00844

JCB part number - 892/00849

(approx 25 m length)

S186330

S186360

9803/3280

Issue 1

www.WorkshopManuals.co.uk_{Section B}

Section B

Body & Framework

1 - 3

Service Tools

1 - 3

Rubber Spacer Blocks - used to provide the correct

set clearance between glass edge

and cab frame.

JCB part number - 926/15500

Nylon Spatula

-

(unit quantity = 500 off)

general tool used for

smoothing sealants

- also

used to re-install glass in rubber

glazing because metal tools will chip

the glass edge.

JCB part number - 892/00847

S186470

S186550

Slide Hammer Kit - 993/68100

1

:993/68101 Slide Hammer

6

:993/68106 Adaptor - M20 x M24

2

:993/68102 End Stops

7

:993/68107 Bar - M20 x M20 X 800MM

3

:993/68103 Adaptor - M20 x 5/8" UNF

8

:993/68108 Adaptor - M20 x 7/8" UNF

4

:993/68104 Adaptor - M20 x 1" UNF

9

:993/68109 Adaptor - M20 x M12

5

:993/68105 Adaptor - M20 x M20

10

:993/68110 Adaptor - M20 x 5/8" UNF (Shoulder)

11

:993/68111 Adaptor - M20 x 1/2" UNF

2

2

11

5

1

3

6

2

4

9

10

8

7

S196910

826/01099

M6 x 16mm Rivet Nut

826/01101

M6 x 19mm Rivet Nut

826/01103

M8 x 18mm Rivet Nut

826/01102

M8 x 21mm Rivet Nut

826/01104

M10 x 23mm Rivet Nut

826/01105

M10 x 26mm Rivet Nut

Installation Tool Available from:

Bollhoff Fastenings Ltd.

Midacre

The Willenhall Estate

Rose Hill

Willenhall

West Midlands, WV13 2JW

S261210

9803/3280

Issue 1

Section B

Body & Framework

Section B

1 - 4

Service Tools

1 - 4

Slide Hammer Kit Procedure

The slide hammer kit is used to remove pivot pins that must

be extracted, i.e. cannot be 'knocked through'. The purpose

of this description is to explain how the kit and the various

components are used to remove the pivot pins.

The adaptors A that form part of the kit have a screwed

thread at each end. One of the threads will always be M20

size, this is to accommodate the end stops, items B and C.

The other end of the adaptor will have varying thread sizes

to suit the different size of threads in the pivot pins.

5

Fit the 'slide hammer', item F, onto the slide bar as

1

Prepare the pivot pin, for instance, if fitted, remove the

shown.

pivot pin retaining bolt.

6

Finally, fit another end stop, item C, at the end of the

2

Determine the thread size of the pivot pin and then fit the

slide bar, as shown. The slide hammer kit is now ready

appropriate adaptor A as shown. Use the spanner flats D

to use.

to securely fit the adaptor.

7

To extract the pivot pin, slide the hammer along the bar

3

Fit an end stop B onto the other end of the adaptor (M20

until it contacts end stop C. Repeat this step until the

thread size), make sure that the adaptor threads are fully

pivot pin is released.

engaged.

8

To remove the slide hammer kit, reverse the steps

4

Fit the 'slide bar' E into the end stop. Again make sure

described above.

that the threads are fully engaged.

C

F

C

B

A

E

D

S196900

9803/3280

Issue 1

Section B

Body & Framework

Section B

1 - 5

Service Tools

1 - 5

Rivet Nut Tool Procedure

A 'Rivet Nut' is a one piece fastener installed 'blind' from

one side of the machine body/framework. The rivet nut is

compressed so that a section of its shank forms an 'upset'

against the machine body/framework, leaving a durable

thread (see illustrations).

Rivet nuts are fitted to various parts of the machine body

and framework. They are used in a number of applications,

for instance, hose clamp and hydraulic valve retention etc.

Various sized rivet nuts are available, see the table below to

determine the size of rivet nut to be used for particular

applications.

If for any reason a new rivet nut requires fitting, then the

A

correct installation procedure must be followed:

1

Drill a hole in the machine body/framework where the

rivet nut is to be fitted. De-burr hole edges.

2

Screw the rivet nut onto the mandrel of the installation

tool. The bottom of the mandrel should be in line with

the bottom of the rivet nut, shown at A.

3

Wind the body of the installation tool down the

threaded mandrel until it touches the head of the rivet

nut, shown at B.

4

Insert the rivet nut (assembled to the tool) into the hole

B

drilled in step 1.

5

Hold handle C and at the same time draw the mandrel

into the installation tool by turning nut D. The rivet nut

will contract in length and form an 'upset' (smooth

bulge) seating itself against the body/framework (see

inset E).

C

Note: The thread of the rivet nut must not be stripped, take

care when 'upsetting' the rivet nut.

6

Remove the installation tool.

E

D

Specifications (all dimensions in mm)

Rivet Nut

Rivet Nut

Material

Rivet

Drill

Thread

Outside

Thickness

Length

Hole

Diameter

Diameter

(Total)

Dia.

M5

7

0.25 - 3.00

14.00

7.10

3.00 - 5.50

17.00

S150970

M6

9

0.50 - 3.00

16.00

9.10

3.00 - 5.50

19.00

M8

11

0.50 - 3.00

18.00

11.10

Note: In an emergency, and if no installation tool is

3.00 - 5.50

21.00

available, it is possible to fit a rivet nut by using a nut and

bolt the same thread diameter as the rivet nut being

M10

13

1.00 - 3.50

23.00

13.10

installed. However, this is not the recommended method.

3.50 - 6.00

26.00

9803/3280

Issue 1

Section B

Body & Framework

Section B

3 - 1

Basic Operation

3 - 1

H

J F

G

D

E

C

X

Y

A401370

B

A

9803/3280

Issue 1

Section B

Body & Framework

Section B

3 - 2

Basic Operation

3 - 2

Air Conditioning

To operate the air conditioning, press switch F to switch the

system on. Press switch G to operate the 3-speed heater

fan. Rotate H to select the desired temperature. Control J

R-134a Refrigerant

enables the operator to select either recirculating air or fresh

air from outside the machine. A combination of both is also

Due to environmental concerns, the use of ozone depleting

obtainable.

chlorofluorocarbons (CFCs) in air conditioning systems is

being gradually phased out.

Air conditioning system power is generated from the engine,

via an electromagnetic clutch to the compressor. Three

The R-12 refrigerant used in some systems contains CFCs

switches, connected in series, are included in the clutch

and is now being replaced by a hydrofluorocarbon (HFC)

supply line, all must be closed for the clutch and therefore

refrigerant R-134a, which does not cause ozone depletion.

the air conditioning system to operate.

The refrigerant used in the 3CX air conditioning system

is R-134a.

The compressor A draws in low pressure refrigerant gas

from the suction line (evaporator to compressor) and

Air conditioning systems using R-134a refrigerant are not

increases refrigerant pressure through compression. This

compatible with systems using R-12 refrigerant. No attempt

process also increases the refrigerant temperature.

should be made to charge R-134a systems with R-12

refrigerant.

High pressure refrigerant is forced from the compressor to

the condenser B, which is mounted at the front of the

System Operation

engine. Ambient air is drawn across the condenser by the

engine- driven cooling fan. In the condenser, the refrigerant

changes state to a high pressure, high temperature liquid

To maintain optimum operator comfort in warm climates or

but with a lower heat content.

during seasons of high ambient temperature, the air

conditioning system delivers cool, dehumidified air into the

The refrigerant passes through the receiver drier C, which

cab. Cooling is provided by passing the warm ambient air,

contains a desiccant to remove moisture from the system.

together with recirculated air, over an evaporator matrix in

The receiver drier serves as a reservoir for refrigerant and

the air conditioning unit.

also includes a filter to remove foreign particles from the

system.

The air conditioning system is a closed circuit through which

the refrigerant is circulated, its state changing from gas to

The high temperature, high pressure refrigerant is forced by

liquid and back to gas again, as it is forced through the

compressor action into the expansion valve D, which meters

system.

the amount of refrigerant entering the evaporator. In the

expansion valve the refrigerant instantaneously expands to

The major components of the system are the compressor A,

become a low pressure, low temperature liquid.

condenser matrix B, receiver drier C, expansion valve D and

evaporator matrix E.

G H

J

F

D

C

X

E

B

Y

A

A401390

9803/3280

Issue 1

Section B

Body & Framework

Section B

3 - 3

Basic Operation

3 - 3

Air Conditioning

System Operation (cont'd)

System Control

The refrigerant is drawn through the evaporator matrix E by

Control of the system is achieved by the cyclic action of the

the suction of the compressor. The temperature of

compressor's electromagnetic clutch. When current is fed to

refrigerant is now considerably below that of the air being

the field coil of the compressor's clutch, a magnetic field

drawn across the evaporator matrix by the blowers. Heat is

develops between the field coil and the armature which pulls

transferred from the ambient and recirculated air to the

the field coil, complete with clutch assembly, onto the

refrigerant, causing the low pressure liquid to vaporise and

compressor's rotor. Since the clutch assembly is turned

become a low pressure gas. Moisture in the air condenses

constantly by the crankshaft pulley drive belt, the

on the evaporator matrix and is drained away via

compressor armature turns, starting the refrigeration cycle.

condensate.

Current is fed to the field coil through three series switches

Cool de-humidified air is emitted through air vents into the

whose contacts are controlled by the following:

cab.

a The manual A/C ON/OFF switch F in the control

The low temperature, low pressure, high heat content

console.

refrigerant gas, is now drawn by suction back to the

compressor, where the cycle is completed.

b The freeze protection thermostat switch monitoring

the evaporator temperature.

Service connection points X and Y adjacent to the

compressor are provided for connecting the pressure gauge

c The high and low level binary pressure switch.

manifold, when charging/testing the refrigerant. Connection

X high pressure (red) and connection Y low pressure (blue).

The ON/OFF switch F will start the refrigeration cycle

provided that the ambient temperature in the cab is greater

than 0°C and the refrigerant pressure remains within the

specified limits.

The thermostat has its sensor inserted in the evaporator

matrix. It controls the refrigeration cycle by switching the

compressor clutch on and off to prevent freezing of the

condensate on the evaporator matrix.

The high and low level binary pressure switch assembly is

located adjacent to the expansion valve on the HVAC unit. If

the refrigerant pressure exceeds the upper pressure limit

specified or falls below the lower limit, the contacts will open

and the clutch will disengage, closing down the refrigeration

cycle.

Note: Switch settings are given in the technical data, refer to

Technical Data - Air Conditioning (Option).

G H J

F

F A/C ON/OFF Switch

G Turn to switch on the 3-speed heater fan. Turn further

clockwise for faster speeds. It functions only with the

starter switch ON.

H Temperature - Turn anti-clockwise to increase the heat.

J Air Recirculation - Turn clockwise to recirculate air in

the cab. Turn anti-clockwise for fresh air from outsde.

The control can be adjusted to give a combination of

A401550

recirculated air and fresh air.

9803/3280

Issue 1

Section B

Body & Framework

Section B

10 - 3

Fault Finding

10 - 3

Air Conditioning - System Diagnosis

This section gives an overview of the following conditions:

Note: Normal gauge readings will depend on system

components and ambient conditions, make sure that the

Normally Functioning A/C System

valves are closed and the readings are stable and that the

Low R-134a Charge

system has a full charge.

Poor Refrigerant Circulation

No Refrigerant Circulation

The pressures on the manifold at 25 °C with the engine at

Insufficient Cooling of Condenser

1500 RPM, the blower on maximum and the thermostat set

Air in System

to maximum, should be approximately:

Expansion Valve Improperly Mounted

Compressor Malfunction

Typically, the high pressure is 6 - 8 times the low pressure.

Moisture in the System

LOW SIDE (Blue)

HIGH SIDE (Red)

Normal

Normal

Normally Functioning A/C System

LOW SIDE - 2.0 bar (2.0 kgf/cm²)(29 lbf/in²)

Gauge Readings:

HIGH SIDE - 14.8 bar (15.1 kgf/cm²)(215 lbf/in²)

Low Side Gauge - Normal.

High Side Gauge - Normal.

Other Indications:

Sight Glass - Clear.

Discharge Air - Cold.

B

C

A

Component Key:

A High Pressure/Temperature Gas.

B Low Pressure/Temperature Gas.

C High Pressure Liquid.

A401380

9803/3280

Issue 1

Section B

Body & Framework

Section B

10 - 4

Fault Finding

10 - 4

Air Conditioning

- System Diagnosis (cont'd)

Low R-134a Charge

LOW SIDE (Blue)

HIGH SIDE (Red)

Gauge Readings:

Low

Low

Low Side Gauge - Low.

High Side Gauge - Low.

Other symptoms:

Sight Glass - Bubbles continuously visible.

Diagnosis:

System slightly low on R-134a, due to leak or

incorrect charge.

Correction:

1. Leak test system.

2. Evacuate A/C system.

3. Repair system leaks.

4. Charge system with R-134a.

5. Operate system and check performance.

A268030

LOW SIDE - 0.76 bar (0.77 kgf/cm²)(11 lbf/in²)

HIGH SIDE - 8.3 bar (8.5 kgf/cm²)(121 lbf/in²)

Poor Refrigerant Circulation

LOW SIDE (Blue)

HIGH SIDE (Red)

Zero to negative

Low

Gauge Readings:

Low Side Gauge - Zero to negative.

High Side Gauge - Low.

Other symptoms:

Receiver-Drier - Frost on tubes from receiver-drier

to evaporator unit.

Diagnosis:

Refrigerant flow obstructed by dirt, receiver-drier

clogged.

Correction:

1. Evacuate A/C system.

2. Replace receiver-drier.

3. Charge system with R-134a.

4. Operate system and check performance.

A268040

LOW SIDE - -1.0 bar (-1.1 kgf/cm²)(-15 lbf/in²)

HIGH SIDE - 5.4 bar (5.5 kgf/cm²)(78 lbf/in²)

9803/3280

Issue 1

Section B

Body & Framework

Section B

10 - 5

Fault Finding

10 - 5

Air Conditioning

- System Diagnosis (cont'd)

No Refrigerant Circulation

LOW SIDE (Blue)

HIGH SIDE (Red)

Gauge Readings:

Zero to negative

Low

Low Side Gauge - Zero to negative.

High Side Gauge - Low.

Other symptoms:

Receiver-Drier - Frost or moisture on tubes before

and after receiver-drier.

Diagnosis:

Refrigerant flow obstructed by dirt, moisture or

gas leakage from expansion valve heat sensing

tube.

Correction:

1. Evacuate A/C system.

2. Check heat sensing tube at expansion valve.

Replace expansion valve if necessary.

3. Remove expansion valve and attempt removal of

dirt. If dirt cannot be removed, replace expansion

valve.

4. Replace receiver-drier.

A268050

5. Charge system with R-134a.

6. Operate system and check performance.

LOW SIDE - -1.0 bar (-1.1 kgf/cm²)(-15 lbf/in²)

HIGH SIDE - 5.4 bar (5.5 kgf/cm²)(78 lbf/in²)

Insufficient Cooling of Condenser or Refrigerant

Overcharge

LOW SIDE (Blue)

HIGH SIDE (Red)

High

High

Gauge Readings:

Low Side Gauge - High.

High Side Gauge - High.

Other symptoms:

Sight Glass - No bubbles visible even at lower

engine RPM.

Diagnosis:

Refrigerant overcharge, condenser cooling fins

clogged with dirt or cooling fans malfunctioning.

Correction:

1. Clean condenser cooling fins.

2. Check cooling fan operation.

3. Evacuate A/C system.

4. Charge system with R-134a.

5. Operate system and check performance.

A268060

LOW SIDE - 3.0 bar (3.0 kgf/cm²)(43 lbf/in²)

HIGH SIDE - 22.1 bar (22.5 kgf/cm²)(320 lbf/in²)

9803/3280

Issue 1

Section B

Body & Framework

Section B

10 - 6

Fault Finding

10 - 6

Air Conditioning

- System Diagnosis (cont'd)

Air in System

LOW SIDE (Blue)

HIGH SIDE (Red)

Gauge Readings:

High

High

Low Side Gauge - High.

High Side Gauge - High.

Other symptoms:

Sight Glass

- Bubbles visible during system

operation.

Pipes - Low pressure pipes are hot to the touch.

Diagnosis:

Air is present in the system, possibly from

inadequate evacuation procedure.

Correction:

1. Evacuate A/C system.

2. Check compressor oil for contamination. Check

compressor for proper oil amount. Correct if

necessary.

3. Charge system with R-134a.

4. Operate system and check performance.

A268070

LOW SIDE - 2.8 bar (2.8 kgf/cm²)(40 lbf/in²)

HIGH SIDE - 22.1 bar (22.5 kgf/cm²)(320 lbf/in²)

Expansion Valve Improperly Mounted or Heat

Sensing Tube Defective (Opening Too Wide)

LOW SIDE (Blue)

HIGH SIDE (Red)

High

High

Gauge Readings:

Low Side Gauge - High.

High Side Gauge - High.

Other symptoms:

Pipes - Large amount of frost or moisture on low side

pipes.

Diagnosis:

Excessive refrigerant in low side pipes possibly

from expansion valve being opened too wide.

Correction:

1. Leak test system.

2. Evacuate A/C system.

3. Repair system leaks.

4. Charge system with R-134a.

5. Operate system and check performance.

A268080

LOW SIDE - 3.5 bar (3.5 kgf/cm²)(50 lbf/in²)

HIGH SIDE - 22.1 bar (22.5 kgf/cm²)(320 lbf/in²)

9803/3280

Issue 1

Section B

Body & Framework

Section B

10 - 7

Fault Finding

10 - 7

Air Conditioning

- System Diagnosis (cont'd)

Compressor Malfunction

LOW SIDE (Blue)

HIGH SIDE (Red)

Gauge Readings:

High

Low

Low Side Gauge - High.

High Side Gauge - Low.

Diagnosis:

Internal compressor leak or compressor

mechanically broken.

Correction:

1. Evacuate A/C system.

2. Repair or replace compressor.

3. Charge system with R-134a.

4. Operate system and check performance.

A268090

LOW SIDE - 4.9 bar (5.0 kgf/cm²)(71 lbf/in²)

HIGH SIDE - 8.3 bar (8.5 kgf/cm²)(121 lbf/in²)

Some Moisture in the System

LOW SIDE (Blue)

HIGH SIDE (Red)

Gauge Readings:

Normal to low

Normal to high

Low Side Gauge - Normal, then sometimes drops to

below zero.

High Side Gauge - Normal, then sometimes goes

high.

Diagnosis:

Moisture in system freezes, temporarily stopping

cycle, normal system operation returns when ice

melts.

Correction:

1. Evacuate A/C system.

2. Replace receiver-drier.

3. Remove moisture by repeatedly evacuating

system.

4. Charge system with R-134a.

5. Operate system and check performance.

A268020

LOW SIDE - -2.1 bar (-2.1 kgf/cm²)(-30 lbf/in²)

HIGH SIDE - 14.8 bar (15.0 kgf/cm²)(214 lbf/in²)

9803/3280

Issue 1

www.WorkshopManuals.co.uk_{Section B}

Section B

Body & Framework

10 - 8

Fault Finding

10 - 8

Air Conditioning (cont'd)

Wiring Continuity Checks

Use the illustration below to complete continuity checks on the HVAC/air conditioning system and heater harness wires.The

harness connects to the main machine harness via connector 1. Refer also to the main machine circuit diagram in Section C

Electrics.

Component Key:

1

Main Machine Harness Connector

2

Air Conditioning ON/Off Switch

2A

Panel Illumination Bulb

2B

Switch Illumination Bulb

3

Blower Switch

4

Binary Pressure Switch

5

Freeze Protection Thermostat

6

Blower Speed Resistor

7

Blower Unit Motor

1

A

B

4

5

2

M

3

6

7

A401410

9803/3280

Issue 1

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