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

Electrical systems - Harnesses and connectors

Wire connectors - Component diagram 10 - Connectors X-9101 to

X-9109

Connector X-9102 - Engine Control Unit (ECU) connector K

84474047

CONNECTOR X-9102 - ECU connector K

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

K01

VE-9083

Main relay switched fused supply,

SHEET

independent source

K02

VE-9210

Ground, Battery minus (negative)

terminal

K03

VE-9079

Main relay switched fused supply,

shared source (K05)

K04

VE-9211

Ground, Battery minus (negative)

terminal

K05

VE-9076

Main relay switched fused supply,

shared source (K03)

K06

VE-9212

Ground, Battery minus (negative)

terminal

K07

VE-9200

Low Side Driver (LSD), DEF/AdBlue®

tank heating valve

K08

VE-9048

Input signal, Key switch start position

K09

K10

K11

K12

K13

K14

K15

K16

K17

K18

K19

K20

K21

K22

VE-9073

Input signal, Glow-plug Control Unit

SHEET

(GCU) feedback

K23

K24

VE-####

CAN 1 High, Diagnostic and

SHEET

maintenance connector

K25

VE-####

CAN 1 Low, Diagnostic and

maintenance connector

K26

55.4 [55.100] / 81

Electrical systems - Harnesses and connectors

CONNECTOR X-9102 - ECU connector K

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

K27

VE-9174

LSD, Starter control relay

SHEET

K28

VE-9084

LSD, Main relay

K29

K30

K31

k32

K33

K34

K35

K36

K37

K38

K39

K40

K41

VE-9074

Reference ground, GCU

SHEET

K42

K43

K44

K45

K46

K47

K48

K49

K50

K51

K52

VE-9072

LSD, GCU

SHEET

K53

VE-9173

HSD, Starter control relay

K54

VE-9053

Input signal, Key switch ON/ACC

position

K55

K56

K57

K58

K59

K60

K61

K62

K63

VE-9156

Input signal, Lambda sensor voltage

SHEET

nernst

K64

VE-9154

Input signal, Lambda sensor current

pump

K65

K66

K67

K68

ISO-K Interface, Diagnostic and

SHEET

monitoring connector K-line

K69

K70

K71

K72

K73

K74

K75

K76

K77

55.4 [55.100] / 82

Electrical systems - Harnesses and connectors

CONNECTOR X-9102 - ECU connector K

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

K78

K79

VE-9188

Reference ground, Exhaust gas

SHEET 02

temperature DOC sensor

K80

VE-9147

Input signal, Exhaust gas temperature

DOC sensor

K81

K82

K83

VE-9153

Reference ground, Exhaust gas

SHEET 02

temperature POC sensor

K84

VE-9152

Input signal, Exhaust gas temperature

POC sensor

K85

VE-9155

Reference ground, Lambda sensor

K86

VE-9157

Input signal, Lambda sensor current

adjust

K87

K88

VE-9077

Input signal, Water in fuel switch

SHEET 02

K89

K90

K91

K92

K93

K94

55.4 [55.100] / 83

Electrical systems - Harnesses and connectors

Wire connectors - Component diagram 11 - Connectors X-9110 to

X-9119

Connector X-9113 - Glow-plugs control unit

84356962

CONNECTOR X-9113 - Glow-plugs control unit

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9060

High Side Driver (HSD), Glow-plug 3

SHEET 01

VE-9058

High Side Driver (HSD), Glow-plug 1

VE-9073

Feedback signal, Engine Control Unit

(ECU)

VE-9062

12 V Supply, Battery positive

VE-9074

Reference ground, ECU

VE-9059

High Side Driver (HSD), Glow-plug 2

SHEET 01

VE-9072

Control signal, ECU

Connector X-9116 - Engine shut-off relay

NOTE: Relays are in product relay panels. See product service manual for pinout image of this connector.

CONNECTOR X-9116 - Engine shut-off relay

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9089

Switched battery voltage, Power relay

SHEET 02

VE-####

Low side control, Operator safety

module

VE-9053

Key switch signal (T50), Engine

Control Unit (ECU)

87A

VE-9088, VE-9089

Switched battery voltage, Power relay

SHEET 02

55.4 [55.100] / 84

Electrical systems - Harnesses and connectors

Wire connectors - Component diagram 12 - Connectors X-9120 to

X-9129

Connector X-9120 - ECU start relay

NOTE: Relays are in product relay panels. See product service manual for pinout image of this connector.

CONNECTOR X-9120 - ECU start relay

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-####

Switched 12 V source, Neutral switch

SHEET 01

VE-9174

Low side switched control, Engine

Control Unit (ECU)

VE-9173

High side switched control, ECU

VE-####

High side control, Crank relay

87A

Connector X-9123 - Lambda sensor

84301132

CONNECTOR X-9123 - Lambda sensor

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9154

Current pump input, Engine Control

SHEET 02

Unit (ECU)

VE-9155

Reference ground, ECU

VE-9200

Low side switched control, ECU

VE-9081

Switched 12 V source, Main ECU

power relay

VE-9157

Current adjust input, ECU

VE-9156

Nernst voltage input, ECU

55.4 [55.100] / 85

Electrical systems - Harnesses and connectors

Connector X-9125 - Water in fuel sensor

84806091

CONNECTOR X-9125 - Water in fuel sensor

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9077

Input signal, Engine Control Unit

SHEET 02

(ECU)

VE-9085

Switched source voltage, Main ECU

power relay

VE-9078

Frame ground

Connector X-9126 - Exhaust gas temperature Diesel Oxidation Catalyst (DOC) sensor

87709793

CONNECTOR X-9126 - Exhaust gas temperature DOC sensor

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9147

Input signal, Engine Control Unit

SHEET 02

(ECU)

VE-9188

Reference ground, ECU

55.4 [55.100] / 86

Electrical systems - Harnesses and connectors

Connector X-9127 - Exhaust gas temperature Pre-Oxidation Catalyst (POC) sensor

87709793

CONNECTOR X-9127 - Exhaust gas temperature POC sensor

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9152

Input signal, Engine Control Unit

SHEET 02

(ECU)

VE-9153

Reference ground, ECU

Connector X-9129 - Main ECU power relay

NOTE: Relays are in product relay panels. See product service manual for pinout image of this connector.

CONNECTOR X-9129 - Main ECU power relay

WIRE NUMBER

CIRCUIT REFERENCE

ELECTRICAL SCHEMATIC FRAME

NUMBER

VE-9087, VE-9086

12 V source, Battery positive

SHEET 02

VE-9086

12 V source, battery positive

VE-9084

Low side switched control, Engine

Control Unit (ECU)

VE-9082

Controlled source, fuse panel

87A

55.4 [55.100] / 87

Electrical systems - Harnesses and connectors

Electrical components - Fuse description

F-001 - MEGA FUSE (Fuse)

Component Type

Fuse

Wiring frames

SHEET 03

Connectors

X-015 (Male)

X-017 (Male)

F-002 - GEP - FUSE BOX (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-003 - FUSE ECU 01 (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-004 - FUSE ECU 02 (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-005 - LAMBDA PROBES (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-006 - CLUSTER HOT (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-007 - WORK LAMP (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-008 - HIGH/LOW BEAM (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-009 - STARTER SWITCH (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-010 - HEATER (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-011 - LOADER (Fuse)

Component Type

Fuse

Wiring frames

SHEET

47866583_

02/12/2015

55.4 [55.100] / 88

Electrical systems - Harnesses and connectors

F-012 - ECU/SAFETY START (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-013 - DUMMY1 (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-014 - DUMMY2 (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-015 - FLASHER (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-016 - CLUSTER / FT (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-017 - HAZARD HOT (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-018 - HORN/ LIGHT SW (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-019 - SAFETY LOGIC (Fuse)

Component Type

Fuse

Wiring frames

SHEET

F-020 - BECON LAMP (Fuse)

Component Type

Fuse

Wiring frames

SHEET

Electrical systems - Harnesses and connectors

Electrical components - Relay description

K-001 - ECU POWER (Relay)

Component Type

Relay

Wiring frames

SHEET

K-002 - CRANKING RELAY (Relay)

Component Type

Relay

Wiring frames

SHEET

K-003 - ING RELAY 01 (Relay)

Component Type

Relay

Wiring frames

SHEET

K-004 - ING RELAY 02 (Relay)

Component Type

Relay

Wiring frames

SHEET

K-005 - W LAMP (Relay)

Component Type

Relay

Wiring frames

SHEET

K-006 - HIGH BEAM (Relay)

Component Type

Relay

Wiring frames

SHEET

K-007 - LOW BEAM (Relay)

Component Type

Relay

Wiring frames

SHEET

K-008 - PTO SAFETY START (Relay)

Component Type

Relay

Wiring frames

SHEET 04

K-009 - STOP LIGHT (Relay)

Component Type

Relay

Wiring frames

SHEET 04

K-010 - ENGINE SHUT-OFF (Relay)

Component Type

Relay

Wiring frames

SHEET 04

K-011 - SAFETY RUN (Relay)

Component Type

Relay

Wiring frames

SHEET 04

K-012 - CRANK PROTECTION (Relay)

Component Type

Relay

Wiring frames

SHEET 04

55.4 [55.100] / 91

Electrical systems - Harnesses and connectors

Electrical components - Switch description

S-001 - IGNITION SWITCH (Switch)

Component Type

Switch

Wiring frames

SHEET 06

Connectors

X-003 (Female)

S-007 - HOME/ENTER (Switch)

Component Type

Switch

Wiring frames

SHEET 07

Connectors

X-018 (Female)

X-019 (Female)

S-008 - UP/DOWN (Switch)

Component Type

Switch

Wiring frames

SHEET 07

Connectors

X-020 (Female)

X-021 (Female)

S-009 - JOYSTICK LOADER (Switch)

Component Type

Switch

Wiring frames

SHEET 06

Connectors

X-520 (Female)

55.4 [55.100] / 94

Electrical systems - Harnesses and connectors

Wiring harnesses - Repair

Temporary wiring harness repair

The following method to repair wiring is a temporary

expedient only. Wiring should be replaced as soon as

possible. Replacement of temporary repaired cables

with new is particularly important if the tractor is to be

used for puddling, spraying etc, as water/chemicals can

enter the repaired area, travel up the cable and damage

electrical components. Do not attempt to repair the wire

on any system sensors as these are sealed and should

only be replaced with a new component.

NOTE: When conducting a cable repair it is important that

only resin cored solder is used. Use of other types of solder

may result in further cable damage.

To carry out a temporary repair, proceed as follows:-

1. Locate damaged portion of cable then cut away outer

protective cover on both sides of the damaged area.

GNIL14TR04711AA

2. Peel back the cable from both ends of the damaged

area and carefully cut away the inner cable cover at

the damaged area and strip about 13.00 mm (0.51 in)

of insulation from the wires. Do not cut away any wire

strands.

3. Using a suitable solvent, clean about

50.00 mm

(1.97 in) from each cover end. Clean the grey cable

cover and the individual leads.

4. Twist two bare leads together for each damaged lead,

being careful to match wire colors, then solder the leads

using resin cored solder. Tape each repaired lead with

vinyl insulation tape, figure 2.

GNIL14TR04712AA

5. Wind a layer of vinyl insulation tape up to the grey cable

cover at each end of the repair section. Make a paper

trough, figure 3, then apply silicon rubber compound

(non hardening sealant) over the repaired section up

to the cover ends. Sufficient sealant must be used to

fill the ends of the cut away area.

GNIL14TR04713AA

55.4 [55.100] / 95

Electrical systems - Harnesses and connectors

6. Allow the compound to cure, then cover the area with

insulating tape taking the tape well over each end of

the repair. An overlap of at least 50.00 mm (1.97 in) of

tape at each end is necessary, figure 4.

7. Check to ensure the repair is satisfactory and secure

the repaired cable so that repeat damage is avoided.

NOTE: This is a temporary repair only. Ensure the dam-

aged cable is replaced as soon as possible to prevent

ingress of water or chemicals.

GNIL14TR04714AA

55.4 [55.100] / 96

Electrical systems - Harnesses and connectors

Wiring harnesses - Troubleshooting Safety start circuit - Operator

present

Problem

Possible Cause

Correction

Starter motor will not

Insufficient battery charge.

Test battery. Charge, add water, or replace

energize

as necessary.

Blown fusible link.

Inspect and replace fusible link as neces-

sary.

Defective key switch.

Test key switch and replace as necessary.

Defective PTO safety or safety start relay.

Test relays and replace as necessary.

Malfunctioning safety start switch.

Test neutral range, main PTO transmission

clutch, and seat safety start switches for

adjustment, proper operation, and faulty

ground circuits.

Malfunctioning starter motor.

Test starter motor and repair or replace as

necessary.

Starter motor energizes,

Blown fuse ignition, 15 A fuse.

Replace fuse.

but fails to start engine

(lacks exhaust smoke)

Defective operator safety module.

Test module and replace as necessary.

Defective fuel shutoff relay.

Test fuel shutoff relay and replace as nec-

essary.

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

Wiring harnesses - Troubleshooting Safety start circuit - Operator

not present

Problem

Possible Cause

Correction

Starter motor will not

Insufficient battery charge.

Test battery. Charge, add water, or replace

energize

as necessary.

Blown fusible link.

Inspect and replace fusible link as neces-

sary.

Defective key switch.

Test key switch and replace as necessary.

Defective PTO safety or safety start relay.

Test relays and replace as necessary.

Malfunctioning safety start switch.

Test neutral range, main PTO transmission

clutch, and seat safety start switches for

adjustment, proper operation, and faulty

ground circuits.

Defective start circuit diode.

Test start circuit diode and replace as nec-

essary. Operator must be out of seat for

test.

Malfunctioning starter motor.

Test starter motor and repair or replace as

necessary.

Starter motor energizes,

Blown fuse ignition, 15 A fuse.

Replace fuse.

but fails to start engine

(lacks exhaust smoke)

Defective operator safety module.

Test module and replace as necessary.

Defective fuel shutoff relay.

Test fuel shutoff relay and replace as nec-

essary.

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

55.4 [55.100] / 97

Electrical systems - Harnesses and connectors

Wiring harnesses - Troubleshooting Safe Operation - Operator

Present

Problem

Possible Cause

Correction

Engine does not continue

Defective seat safety switch.

Test seat safety switch and replace as nec-

to run while operator is

essary.

seated

Defective Fuel shutoff relay.

Test relay and replace as necessary.

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

Defective operator safety module.

Test module and replace as necessary.

Open wiring in safe operation circuit.

Check for loose connectors, grounds, and

wiring damage.

Engine continues to run

Defective seat safety switch.

Test seat safety switch and replace as nec-

after operator has left

essary.

seat for more than two

seconds and mid PTO and

park brake is not engaged

Defective operator safety module.

Test operator safety module and replace as

necessary.

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

Short-circuit in wiring or faulty ground cir-

Check for loose safety switch connectors,

cuit.

grounds, and wiring harness for damage.

Wiring harnesses - Troubleshooting Safe operation - Operator not

present, PTO "OFF"

Problem

Possible Cause

Correction

Engine does not continue

Defective neutral safety switch.

Test neutral safety switch and replace as

to run while operator is

necessary.

seated

Blown 3 A diode.

Check diode, replace if necessary.

Defective Fuel shutoff relay.

Test relay and replace as necessary

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

Defective operator safety module.

Test module and replace as necessary.

Open wiring in safe operation circuit.

Check for loose connectors, grounds, and

wiring damage.

Engine continues to

Defective neutral safety switch.

Test neutral safety switch and replace as

run after operator

necessary.

has left seat for more

than two seconds with

transmission range in

gear

Defective operator safety module.

Test operator safety module and replace as

necessary.

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

Short-circuit in wiring or faulty ground cir-

Check for loose safety switch connectors,

cuit.

grounds, and wiring harness for damage.

Wiring harnesses - Troubleshooting Safe operation - Operator not

present; PTO “ON”

Problem

Possible Cause

Correction

Engine does not continue

Defective fuel shutoff relay.

Test relay and replace as necessary.

to run while operator is

not seated

55.4 [55.100] / 98

Electrical systems - Harnesses and connectors

Problem

Possible Cause

Correction

Blown 3 A diode.

Check diode, replace if necessary.

Malfunctioning fuel shutoff solenoid.

Test fuel shutoff solenoid and replace as

necessary.

Defective operator safety module.

Test module and replace as necessary.

Open wiring in safe operation circuit.

Check for loose connectors, grounds, and

wiring damage.

Engine does not continue

Defective range neutral switch, PTO

Test components and replace as neces-

to run when operator is

switch, or 3 A diode.

sary.

not in seat, transmission

is in neutral, PTO is on,

and park brake is engaged

55.4 [55.100] / 99

Index

Electrical systems - 55

Harnesses and connectors - 100

Wiring harnesses - Electrical schematic sheet 03 SH03-STARTING/CHARGING SYSTEM

Wiring harnesses - Electrical schematic sheet 04 SH04-POWER DISTRIBUTION:GEP RELAY BOX

Wiring harnesses - Electrical schematic sheet 05 SH05-GROUNDING SYSTEM

Wiring harnesses - Electrical schematic sheet 06 SH06-IGNITION/CONTROL SWITCHES

Wiring harnesses - Electrical schematic sheet 07 SH07-INSTRUMENT CLUSTER: ADIC

Wiring harnesses - Electrical schematic sheet 08 SH08-ENGINE CONTROL UNIT: ECU

Wiring harnesses - Electrical schematic sheet 09 SH09-SAFETY LOGIC

Wiring harnesses - Electrical schematic sheet 10 SH10-FRONT HEAD LIGHTS

Wiring harnesses - Electrical schematic sheet 11 SH11-REAR LIGHTS

Wiring harnesses - Electrical schematic sheet 12 SH12-DIAGONESTIC/TRAILER SOCKET

Wiring harnesses - Electrical schematic sheet 01 - Power distribution and glow plugs (engine

schematics)

Wiring harnesses - Electrical schematic sheet 02 - Engine Control Unit (ECU) power and after treat-

ment system (engine schematics)

Wiring harnesses - Electrical schematic sheet 03 - Engine sensors and fuel injection (engine

schematics)

Electrical components - Fuse description

Electrical components - Motor description

Electrical components - Relay description

Electrical components - Switch description

Electrical components - Voltage source description

Wire connectors - Component diagram 00 - Connectors X-9001 to X-9009

Wire connectors - Component diagram 00

Wire connectors - Component diagram 01 - Connectors X-9010 to X-9019

Wire connectors - Component diagram 01

Wire connectors - Component diagram 02 - Connectors X-9020 to X-9029

Wire connectors - Component diagram 02

Wire connectors - Component diagram 03 - Connectors X-9030 to X-9039

Wire connectors - Component diagram 05

Wire connectors - Component diagram 10 - Connectors X-9101 to X-9109

Wire connectors - Component diagram 10

Wire connectors - Component diagram 11 - Connectors X-9110 to X-9119

Wire connectors - Component diagram 12 - Connectors X-9120 to X-9129

Wire connectors - Component diagram 20

55.4 [55.100] / 100

Wire connectors - Component diagram 21

Wire connectors - Component diagram 30

Wire connectors - Component diagram 40

Wire connectors - Component diagram 50

Wire connectors - Component diagram 51

Wire connectors - Component diagram 52

Wire connectors - Component diagram 60

Wire connectors - Component diagram 61

Wire connectors - Component diagram 70

Wire connectors - Component diagram 71

Wire connectors - Component diagram 90

Wiring harnesses - Electrical schematic sheet 02 SH02-POWER DISTRIBUTION:GEP FUSE BOX

Wiring harnesses - Repair

Wiring harnesses - Troubleshooting Safe Operation - Operator Present

Wiring harnesses - Troubleshooting Safe operation - Operator not present, PTO "OFF"

Wiring harnesses - Troubleshooting Safe operation - Operator not present; PTO “ON”

Wiring harnesses - Troubleshooting Safety start circuit - Operator not present

Wiring harnesses - Troubleshooting Safety start circuit - Operator present

55.4 [55.100] / 101

Electrical systems - Engine starting system

Engine starting system - Dynamic description

Description of operation

The starting system consists of a starter motor equipped with an electromagnetic starter solenoid, a key switch, a

start relay, several safety switches, and heavy-duty wiring.

Starter components

SEC55CH4PG28

(1) Reduction Uni Cover

(9) Plunger

(2) Armature Drive Gear

(10) Solenoid

(3) Motor/Field Coil Housing (Yoke)

(11) Return Spring

(4) Permanent Magnet

(12) Pinion Clutch

(5) Field Coil

(13) Pinion

(6) Armature

(14) Idler Gear

(7) Brush Spring

(15) Idler Gear Roller Bearing

(8) Brush

Starter motor assembly

The starter motor features a high-speed motor that utilizes a gear reduction unit, an overrunning pinion clutch, (12),

and permanent magnets, (4), in a field coil, (5), for magnetic field induction. The reduction unit consists of a small

drive gear, (2), on the motor armature, (6), which drives an idler gear, (14), in the reduction unit. The idler gear is

splined to the gear on the pinion clutch housing, (12). When the starter solenoid, (10), is energized, the solenoid

plunger, (9), pushes the pinion gear, (13), out, engaging with the engine flywheel. The starter motor then is turning

the flywheel, which rotates the engine. The use of the gear reduction unit allows use of the compact, high-speed

motor and provides more torque and power to turn the engine flywheel. The sliding pinion mechanism is enclosed,

resulting in a more durable mechanism.

55.5 [55.201] / 3

Electrical systems - Engine starting system

Starter solenoid

The starter solenoid is an electromagnetic type solenoid

that is located on the bottom of the starter motor assem-

bly. The solenoid contains two coils, a pull-in coil, (1)

and a hold-in coil (2) When the key switch is turned to

the "START" position and the safety start relay is closed

(safety switches closed), current from the battery will en-

ergize the solenoid's two coils. With the coils energized,

the solenoid plunger, (3) pushes a spring (4) which will

then push the pinion gear out to engage the flywheel. At

the same time, a set of contacts (5), on the solenoid be-

come closed, allowing current to flow to the starter motor.

Closing the contacts also supplies current to both ends

of the solenoid pull in coil which makes the coil become

non-energized. The hold-in coil continues to engage the

pinion gear with the flywheel.

SEC55CH4PG29_1

Pinion clutch

To prevent the engine from driving the starter motor once

the engine is running, the pinion gear is equipped with an

overrunning clutch. The clutch will disengage the pinion

gear from the rest of the starter components once the en-

gine has been started and the key switch is in the "START"

position. The clutch consists of an outer gear/shell, (1), a

cam with tapered notches, (2), rollers, (3), roller springs,

(4), a splined pinion collar/tube that acts as a clutch hub,

(5), and the pinion shaft, (6). As the starter motor engages

and rotates, the rollers are locked against the pinion collar

with the tension provided by the roller springs. While the

rollers are locked, the clutch assembly is locked, allowing

the pinion gear to rotate the flywheel. When the engine

starts, the flywheel moves faster than the starter motor

and this causes the rollers to become unlocked. With the

SEC55CH4P29_2

rollers unlocked, the clutch assembly is unlocked, allow-

A-

Engaged,

B-

Disengaged

ing the pinion gear and shaft to turn independently of the

starter motor.

(1) Clutch Gear

(2) Cam

(3) Roller

(4) Spline Tube - Inner (Pinion Collar)

(5) Pinion Shaft

(6) Roller Spring

The clutch is not serviceable and is replaced as a com-

plete assembly.

Once the engine is started and the key switch is released

from the "START" position, the solenoid's pull in coil be-

comes energized, pulling the solenoid plunger in, which

disengages the pinion from the flywheel.

SEC55CH4P29_3

55.5 [55.201] / 4

Electrical systems - Engine starting system

Engine starter - Troubleshooting

Problem

Possible Cause

Correction

Pinion shaft fails to

Wiring: Open circuit battery, and switch ter-

Repair or replace.

advance

minal connections.

Wiring: Open circuit, fuse.

Replace fuse.

Key switch: No contact.

Repair or replace.

Starter motor: Sleeve bearing burnt out.

Repair or replace.

Starter motor: Lever broken.

Replace.

Solenoid: Plunger movement defective or

Repair or replace.

coil open or shorted.

Pinion motor rotates but

Starting motor: Clutch defective.

Replace.

no rotation transmitted to

engine

Starting motor: Orbital gear or planetary

Replace.

gears damaged.

Motor rotates before

Starter motor: Shift lever damaged.

Replace.

pinion meshes with ring

gear

Starter motor: :Shift lever damaged

Replace.

Starter motor: Slip ring defective.

Replace.

Starter motor: Pinion teeth worn.

Replace.

Starter motor: Pinion push out position de-

Adjust.

fective.

Engine: Ring gear worn.

Replace.

Solenoid defective

Replace.

Pinion meshes with ring

Wiring: Line connecting solenoid to battery

Repair or replace.

gear but starting motor

broken or defective ground.

fails to turn

Wiring: Lead wire connecting solenoid to

Repair or replace.

motor tightened improperly.

Starting motor: Ball bearing locked.

Replace.

Starting motor: Brush worn.

Replace.

Starting motor: Improper installation.

Reinstall.

Starting motor: Brush spring defective.

Replace.

Starting motor: Commutator dirty.

Clean.

Starting motor: Armature of field coil defec-

Repair or replace.

tive.

Starting motor: Field coil-to-brush connec-

Replace.

tion defective.

Solenoid: Contact not touching properly.

Replace.

Solenoid: Contact contacting surface

Replace.

roughened.

Battery: In discharge state.

Recharge or replace.

Motor fails to stop after

Key switch: defective.

Replace.

engine starts and key

switch is turned off

Defective solenoid.

Replace.

55.5 [55.201] / 7

Electrical systems - Alternator

Alternator - Troubleshooting

Problem

Possible Cause

Correction

No charging

Wiring: Loose connection or short circuit.

Repair.

Alternator: Loose connection, no ground,

Repair or replace.

or short circuit.

Alternator: Defective rectifier.

Replace.

Regulator: Defective regulator.

Replace.

Regulator: Loose connection of alternator

Repair or replace.

or regulator.

Insufficient charging

Wiring: Loose connection or short circuit.

Repair.

Alternator: Loose drive belt.

Repair.

Alternator: Short in rotor coil.

Replace.

Alternator: Short in stator coil.

Replace.

Alternator: Defective rectifier.

Replace.

Alternator: Insufficient brush contact.

Repair or replace.

Regulator: Defective regulator.

Replace.

Regulator: Loose connection of alternator

Repair.

and regulator.

Battery: Defective Battery.

Replace.

Overcharge

Battery: Internal short.

Replace.

Regulator: Defective regulator.

Replace.

Unstable Charging Circuit

Wiring: Loose connection or open wire.

Repair or replace.

Alternator: Loose drive belt.

Repair.

Alternator: Short in rotor coil.

Replace.

Alternator: Short in stator coil.

Replace.

Alternator: Broken brush or spring.

Replace.

Alternator: Loose connection.

Repair.

Regulator: Defective Regulator.

Replace.

Regulator: Loose connection at alternator

Repair or replace.

and regulator.

Abnormal Noise from

Alternator: Loose mounting hardware.

Repair.

Alternator

Alternator: Defective bearings.

Repair or replace.

Alternator: Rotor core and stator in contact.

Replace.

Alternator: Defective diode.

Replace.

Alternator: Short in stator coil.

Replace.

55.6 [55.301] / 3

Electrical systems - Battery

Battery - Remove

WARNING

Improper operation or service of this machine can result in an accident.

Before working on any component(s) of the electrical circuit, put the starter switch key in the off (shut

down) position. When disconnecting batteries, always disconnect the negative (-) cable first. When

reconnecting batteries, always connect the negative (-) cable last.

Failure to comply could result in death or serious injury.

W0264A

1. Unlatch and raise the hood to gain access to the bat-

tery.

2. Remove the negative (-) cable, (1), from the negative

(-) terminal on the battery.

3. Remove the positive (+) cable, (2), from the positive (+)

terminal on the battery.

4. Remove the nut, washer and J-bolt, (3), which secures

the battery to the tractor frame.

5. Remove the battery from the tractor.

GNIL14TR00784AA

55.7 [55.302] / 3

Electrical systems - Battery

Battery - Check

DANGER

Hazardous chemicals!

Battery electrolyte contains sulfuric acid. Contact with skin and eyes could result in severe irritation

and burns. Always wear splash-proof goggles and protective clothing (gloves and aprons). Wash

hands after handling.

Failure to comply will result in death or serious injury.

D0105A

WARNING

Explosive gas!

Batteries emit explosive hydrogen gas and other fumes while charging. Ventilate the charging area.

Keep the battery away from sparks, open flames, and other ignition sources. Never charge a frozen

battery.

Failure to comply could result in death or serious injury.

W0005A

1. The battery is located in front of the radiator.

The battery electrolyte level should be between the

minimum and maximum lines provided on battery con-

tainer.

If necessary, top off with distilled or de-mineralized wa-

ter until the level is correct. Do not overfill. Never use

tap water or water from rain barrel or other source.

To prevent the formation of corrosion, the terminals

should be cleaned and smeared with petroleum jelly

only, no grease should be applied.

NOTE: Battery size - BCI group - 47 (CCA 600--850).

GNIL14TR00784AA

55.7 [55.302] / 4

Electrical systems - Battery

Battery - Install

1. Check the battery for cleanliness, especially around the

terminals. Clean the area where the battery mounts

to the tractor frame to prevent debris from piercing the

body of the battery.

2. Check the vent caps for proper installation and tight-

ness.

3. Ensure that no leakage occurs from the battery.

4. Install the battery squarely into position before securing

with strap, and J-bolt, (1).

5. Connect the negative (-) terminal, (2), then the positive

(+) terminal, (3).

NOTE: Coat the battery terminal clamps with petroleum

jelly or equivalent. Do not use conventional lubricants as

electrolyte corrosion may occur.

6. Check battery terminal connections for correct polarity

and tightness. Do not overtighten. Install dust covers

over terminals, (where installed).

GNIL14TR00784AA

55.7 [55.302] / 5

New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 16