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New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 17

Electrical systems - External lighting

Headlight - Replace

1. Remove the electrical connector (1)

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1

2. Remove the rubber boot (2)

3. Change a burned out bulb for another halogen bulb of

the same power

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Electrical systems - External lighting

Turn signal and/or hazard lights - Replace

Stop/Turn/Position lights, bulb replacement

The bulbs are accessible after removal of the plastic

lenses assembly. Remove the two screws (1) and take

out the lens assembly (2). The bulbs can be removed

by pressing in and turning approximately 20 degree

counterclockwise. Reassemble in reverse order.

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1

Tail light (3) and flasher/turn signal light (4)

NOTICE: When replacing the lenses, take care not to over-

tighten the retaining screws.

Bulb Size

• Tail Light - #1157

• Flasher/Turn Signal - #1156

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Electrical systems - External lighting

External lighting - Troubleshooting Lighting circuit

Problem

Possible Cause

Correction

Front road lamps will not

Insufficient battery charge.

Test battery. Charge, add water, or replace

illuminate or are dim

as necessary.

Road lamp bulb faulty.

Check and replace bulb as necessary.

Blown fusible link.

Inspect fusible link and replace as neces-

sary.

Blown fuse head/park, 20 A fuse.

Replace fuse as necessary.

Defective light switch.

Test light switch and replace as necessary.

Improper connection at work lamp termi-

Check connections and lamp socket. Re-

nals or headlight socket.

pair or replace as necessary.

Improper ground connection.

Check ground connections and repair as

necessary.

Rear taillights will not

Insufficient battery charge.

Test battery. Charge, add water, or replace

illuminate or are dim

as necessary.

Taillight bulb fault.

Check and replace bulb as necessary.

Blown fusible link.

Inspect fusible link and replace as neces-

sary.

Blown fuse head/park, 20 A fuse.

Replace fuse as necessary.

Defective light switch.

Test light switch and replace as necessary.

Improper connection at taillight lamp termi-

Check connections and lamp socket. Re-

nals or lamp socket.

pair or replace as necessary.

Improper ground connection.

Check ground connections and repair as

necessary.

Instrument panel

Insufficient battery charge.

Test battery. Charge, add water, or replace

illumination light not

as necessary.

illuminated or is dim

Instrument panel illumination bulb burnt

Check and replace bulb as necessary.

out.

Blown fuse head/park, 20 A fuse.

Replace fuse as necessary.

Defective light switch.

Test light switch and replace as necessary.

Improper connection at instrument panel

Check connections and socket. Repair or

terminals or light socket

replace as necessary.

Improper ground connection

Check ground connections and repair as

necessary.

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Electrical systems - External lighting

Turn signal and/or hazard lights - Troubleshooting Hazard lighting

circuit

Problem

Possible Cause

Correction

Hazard Signal Lights will

Blown fuse hazard,

15 A hazard signal

Inspect fuse and replace as necessary.

not illuminate or flash

fuse.

Hazard signal bulb(s) burnt out.

Inspect bulb(s) and replace as necessary.

Defective hazard switch.

Test switch and replace as necessary.

Defective flasher cutoff relay.

Test flasher relay by using a known func-

tioning flasher relay and replace as neces-

sary.

Defective hazard/turn flasher module.

Test module and replace as necessary.

Faulty wiring or ground connection.

Inspect the tractor's wiring harness and

ground terminals for damage, corrosion,

and short circuits. Repair or replace as

needed.

Instrument panel hazard

Indicator bulb(s) burnt out

Inspect bulb and replace as necessary

indicator( s) does not

illuminate

Faulty wiring or ground connection

Inspect the tractor s wiring harness and

ground terminals for damage, corrosion,

and short circuits. Repair or replace as

needed

Turn signal and/or hazard lights - Troubleshooting Right turn signal

circuit

Problem

Possible Cause

Correction

Directional signal will not

Blown fuse turn/horn, 15 A hazard or direc-

Inspect fuse and replace as necessary.

illuminate or flash

tional signal fuse.

Blown fuse hazard, 15 A fuse.

Inspect fuse and replace as necessary.

Directional signal bulb burnt out.

Inspect bulb and replace as necessary.

Defective directional signal switch.

Test switch and replace as necessary.

Defective hazard/turn flasher module.

Test module and replace as necessary.

Faulty wiring or ground connection.

Inspect the tractor's wiring harness and

ground terminals for damage, corrosion,

and short circuits. Repair or replace as

needed.

Instrument panel turn

Indicator bulb burnt out.

Inspect bulb and replace as necessary.

indicator does not

illuminate

Faulty wiring or ground connection.

Inspect the tractor's wiring harness and

ground terminals for damage, corrosion,

and short circuits. Repair or replace as

needed.

Turn signal and/or hazard lights - Troubleshooting Left turn signal

circuit

Problem

Possible Cause

Correction

Directional signal will not

Blown fuse turn/horn, 15 A hazard or direc-

Inspect fuse and replace as necessary.

illuminate or flash

tional signal fuse.

Blown fuse hazard, 15 A fuse.

Inspect fuse and replace as necessary.

Directional signal bulb burnt out.

Inspect bulb and replace as necessary.

Defective directional signal switch.

Test switch and replace as necessary.

Defective hazard/turn flasher module.

Test module and replace as necessary.

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Electrical systems - External lighting

Problem

Possible Cause

Correction

Faulty wiring or ground connection.

Inspect the tractor's wiring harness and

ground terminals for damage, corrosion,

and short circuits. Repair or replace as

needed.

Instrument panel turn

Indicator bulb burnt out.

Inspect bulb and replace as necessary.

indicator does not

illuminate

Faulty wiring or ground connection.

Inspect the tractor's wiring harness and

ground terminals for damage, corrosion,

and short circuits. Repair or replace as

needed.

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Electrical systems - External lighting switches and relays

Brake light switch - Overview

The brake pedal switch (1) is located below the right foot

board near the foot brake. It is actuated while applying

brake and is indicated by the light provided on the fender.

GNIL14TR04724AB

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Electrical systems - Warning indicators, alarms, and instruments

Warning indicators, alarms, and instruments - Overview

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1

Turn signal switch

Turn signal switch (1) indicates turn signals and should be moved to the right to operate right turn indicator light and

left to operate left turn indicator light.

NOTE: The turn signal will operate only when the starter switch is turned on.

Shuttle shift lever

The shuttle shift lever (2) is used to change the direction of travel, between forward and reverse.

Hazard switch

The hazard switch (3) activates the hazard flasher lights. Use the hazard flasher lights when traveling on public roads,

day or night.

Head light switch

The head light switch (4) consists of four positions, (refer to Head Light Switch Positions).

Central display navigation buttons

The menus of the central liquid crystal display on the instrument panel are navigated through with the rocker switches

(5)

(A) and (B).

Hand throttle lever

The hand throttle lever (6) should be used during the field operation.

Push the lever up to increase the engine speed and down to reduce it.

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Electrical systems - Warning indicators, alarms, and instruments

Horn Button

Press the horn button (7) for warning arrival

Head Light Switch Positions

The head light switch (8) consists of four positions,

Position (1)

- Off

Position (2)

- Parking lights on.

Position (3)

- Head lamp low beam.

Position (4)

- Head lamp high beam.

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Key start/stop switch

The key start switch (9) activates electrical equipment, lights, gauges and starting motor.

Electronic service tool socket

The Electronic Service Tool (EST) socket (10) is used to connect the EST to the tractor.

Hazard warning light switch

The hazard warning lights switch (3) ( 1 ) activates the

hazard flashing warning lights (1) located on each side of

the ROPS (2).

The hazard flashing warning lights can be activated with

the key switch in any position. For your protection, use the

flasher warning lights and the SMV (Slow Moving Vehicle)

emblem (3) when travelling on public roads, day or night.

76099309N

3

Trailer electrical socket

A standard 7-pin trailer socket (1) is provided as standard

equipment and is mounted to the left side of ROPS cross

brace.

The socket pin connections (see insert) are as follows:

Pin No.

Circuit

1

Ground

2

Work Lights

3

Left Hazard Flasher Light

4

Current Input (not switched)

5

Right Hazard Flasher Light

6

Taillights

76099308N

4

7

Current Input (Switched)

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Electrical systems - Warning indicators, alarms, and instruments

Instrument cluster - Overview

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1

The indicator lights on the control panel inform you of the operational condition of the machine. Some of these indicate

faults arising during operation. An indicator light coming on may be followed by a continuous or intermittent buzzer.

Depending on the severity of the trouble, the alarm will sound.

Trailer direction indicator light (green)

1

This indicator light flashes together with the tractor/trailer direction indicators, if the first

trailer is connected

Full beam headlights (blue)

2

This indicator light will illuminate when the tractor lights are switched to high beam.

Side lights (green)

3

This indicator light is illuminated when the tractor lights are turned on.

Stop warning light (red)

4

If the red “Stop” warning light comes on, switch off the tractor immediately and look for the

cause. A warning symbol will appear on the display (30) confirming the location of the fault.

Engine coolant temperature gauge

5

This instrument indicates the temperature of the engine coolant.

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Electrical systems - Warning indicators, alarms, and instruments

Indicator lamp (amber)

This indicator light comes on and the display shows a warning symbol (30). The light blinks

6

for 4 seconds, after which the symbol on the display disappears and the indicator light stays

on steady. To display the fault, you need to go to the menu. Stop the tractor and investigate

the cause of the trouble.

Parking brake warning light (red)

This lights up when the key start switch is turned ON with the parking brake applied. If the

7

key-start switch is turned OFF and the parking brake is not applied, or the operator leaves

the seat without applying the parking brake, a warning buzzer will sound for approximately 10

seconds or until the parking brake has been applied.

Engine oil pressure warning light (red)

Engine oil pressure indicator light (red) - This indicator light together with the red (5). ”Stop”

indicator light indicates the engine oil pressure is too low. Stop the engine and investigate

8

the cause.

NOTE: With low engine oil pressure, this warning light illuminates when the start switch is in

the contact position B (supply to accessories - ignition).

Cold start device (amber)

9

The indicator lights up when the glow plugs are turned on by the key start switch.

Right direction indicator (green)

This indicator light flashes at the same time as the tractor's right direction indicator. With the

10

tractor running, if the turn signal is not switched off within 20 seconds an intermittent alarm

comes on. This audible warning comes on if the direction indicator is not turned off within five

minutes with the tractor stationary.

Warning light of the Diesel Particulate Filter (DPF) (green)

11

For more details, see the chapter on regeneration of the particulate filter.

Alternator charging warning light (red)

12

A steady light indicates that the alternator is not charging the battery.

Fuel reserve (amber)

13

The light comes on when the tractor needs refuelling.

Fuel Level Gauge

14

This instrument shows the fuel level in the tank.

Revolution counter

15

Indicates the engine rpm. Each subdivision of the graduated scale represents 100 revs/minute.

Rear Power Take−Off (PTO) warning light (yellow)

Lights up when the engine is running and the rear power take-off is engaged.

16

The warning light, from being on steady, starts blinking when the power take−off exceeds

the maximum permissible number of revs.

Left direction indicator (green)

This indicator light flashes at the same time as the tractor's left direction indicator. With the

17

tractor running, if the turn signal is not switched off within 20 seconds an intermittent alarm

comes on. This audible warning comes on if the direction indicator is not turned off within five

minutes with the tractor stationary.

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Electrical systems - Warning indicators, alarms, and instruments

Work lights (amber)

18

This warning light illuminates when the work lights are switched on.

Information Display

19

The display shows information on the operational condition of the machine and highlights any

trouble in the form of symbols or error codes.

Rev counter/ Techometer

The rev counter (1) indicates the engine rpm. Each di-

vision on the scale represents 100 rev/min., therefore,

with the needle indicating 20 , the engine is running at

2000 RPM.

Engine speed

NOTICE: Never use the engine continuously for a long

time at speeds between 2500 - 3000 RPM (yellow area

on the speedometer) to avoid damage to the engine

and definitely never exceed

3000 RPM (red area on

the speedometer). For appropriate use, always operate

DCUTLBRNE003S3A

2

under the speed corresponding to 2300 RPM.

Engine coolant temperature gauge

The temperature display (1) indicates the temperature of

the engine coolant.

• blue area = normal temperature;

• red area = temperature too high.

In this case, slow the engine to idling speed (without stop-

ping the engine) and, if the light stays on, have the cooling

system checked.

DCUTLBRNE004S3A

3

Fuel level gauge

This instrument (1) indicates the level of diesel in the tank

and only works when the ignition key is turned onto ON.

DCUTLBRNE005S3A

4

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Electrical systems - Warning indicators, alarms, and instruments

Central display

The central liquid crystal display provides the operator

with a range of information

• Front or rear power take−off speed

Front or rear lift position

Slip

Data displayed by pressing and releasing the button

ENTER (A)

• Tractor direction.

• Speed of the vehicle in Km/h or MPH

DCAPLT5NE005S3F

5

• Tractor working hour meter

• Kilometers travelled

Area worked

Area worked per hour

Battery voltage

Data displayed by pressing the arrow buttons up or

down (B)

When necessary, warning and error messages

Programming menu (see specific chapter)

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Electrical systems - Warning indicators, alarms, and instruments

Instrument cluster - Remove

1. Lift the front hood.

2. Disconnect battery terminals.

NOTE: Always disconnect the negative cable (1) first.

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1

3. Remove the steering wheel cover (1).

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2

4. Loosen the steering wheel securing nut.

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3

5. Loosen the steering wheel securing nut and remove

the steering wheel using tool number 82834312 and

9971375.

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4

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Electrical systems - Warning indicators, alarms, and instruments

6. Disconnect the wiring connection (1) near the steering

column.

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5

7. Loosen the bolt (1) and remove the shuttle lever.

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6

8. Remove the hand throttle knob.

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7

9. Unscrew all the screws of instrument panel.

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8

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Electrical systems - Warning indicators, alarms, and instruments

10. Pull out the instrument panel from rear hood.

11. Disconnect all the electric connections of the switches

and hourmeter from the instrument cluster.

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Electrical systems - Warning indicators, alarms, and instruments

Instrument cluster - Install

1. Connect wiring coupler to horn switch.

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1

2. Connect wiring coupler to head light switch.

GNIL14TR00773AA

2

3. Connect wiring coupler to indicator switch.

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3

4. Connect wiring coupler to programming arrow switch.

GNIL14TR00775AA

4

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Electrical systems - Warning indicators, alarms, and instruments

5. Connect wiring coupler to home programming switch.

GNIL14TR00776AA

5

6. Connect wiring coupler to Hi-Lo beam switch.

GNIL14TR00777AA

6

7. Connect wiring coupler to hazard warning switch.

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7

8. Tighten all the screws (1) of instrument panel.

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Electrical systems - Warning indicators, alarms, and instruments

9. Fit the hand throttle knob.

GNIL14TR00706AA

9

10. Fit the shuttle lever and tighten the bolt (1).

GNIL14TR00705AA

10

11. Connect the wiring coupler (1) near the steering col-

umn.

GNIL14TR00711AA

11

12. Install the steering wheel and cover (1).

GNIL14TR00512AA

12

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Electrical systems - Warning indicators, alarms, and instruments

13. Connect the battery terminals (1) and (2).

GNIL14TR00784AA

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Electrical systems - Warning indicators, alarms, and instruments

Instrument cluster - Troubleshooting

Problem

Possible Cause

Correction

Warning lights and

Blown #6 15 A fuse.

Replace fuse.

gauges inoperative

Gauges erratic or

Faulty ground circuit.

Check ground connections for proper con-

inoperative

tact.

Faulty sender.

Check sender for proper operation.

Warning lights not

Bulb is burned out

Replace bulb

illuminating

Sender wire damaged

Check wiring harness for damage

Faulty sender

Check sender for proper operation

Gauges always show

Sender wire shorted to ground.

Check sender wire for damage.

maximum reading

Erratic tachometer

Fan belt slipping.

Tighten fan belt.

reading

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Electrical systems - Cab controls

Joystick and Electric Hydraulic (EH) control - Remove

1.

1. Loosen the locknut on joystick cable.

2. Loosen the set screws on the connectors of joystick

cable.

3. Slide the connector on the joystick cable.

GNIL14TR00764AA

1

2. Remove the roll pin (1) and remove the joystick cable.

GNIL14TR00821AA

2

3. Similarly remove the other joystick cable.

GNIL14TR00788AA

3

4. Loosen the screws (1) and remove the cover (2) of the

joystick.

GNIL14TR00786AA

4

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Electrical systems - Cab controls

5.

1. Disconnect the electrical coupling.

2. Loosen the bolts (1) and remove the joystick from

the mounting bracket.

GNIL14TR00787AA

5

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Electrical systems - Cab controls

Joystick and Electric Hydraulic (EH) control - Install

1. Install the joystick on the mounting bracket and tighten

the bolts (1).

Connect the electrical coupling.

GNIL14TR00787AA

1

2. Fit the cover (1) of the joystick and tighten the screws

(2).

GNIL14TR00786AA

2

3. Insert the roll-pin (1) and connect the joystick cable,

passing through the footboard, on the mid-mount valve.

NOTE: Connect the green colored cable on the upper port

of the mid-mount valve. Connect the yellow colored cable

on the lower port of the mid-mount valve.

GNIL14TR00821AA

3

4. Tighten the set screw (1) on the connector of the joy-

stick cable.

Tighten the locknut (2).

GNIL14TR00788AA

4

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