New Holland 70 Series Operating instructions

REPAIR
MANUAL
8701272 6/02
70 Series
70A Series
New Holland North America, Inc., New Holland, PA
Printed in U.S.A.

87018730 6/02
2002 NEW HOLLAND NORTH AMERICA, INC.
Printed In U.S.A.
70/70A SERIES REPAIR MANUAL
COMPLETE CONTENTS
SECTION 00 - GENERAL INFORMATION 2.............................
SECTION 10 - ENGINE 2..............................................
SECTION 21 - TRANSMISSION 7.......................................
SECTION 23 - DRIVE LINES 12..........................................
SECTION 25 - FRONT MECHANICAL DRIVE 12...........................
SECTION 27 - REAR DRIVE AXLE 15....................................
SECTION 31 - POWER TAKE-OFF 16....................................
SECTION 33 - BRAKES AND CONTROLS 17.............................
SECTION 35 - HYDRAULIC SYSTEMS 20................................
SECTION 41 - STEERING 29............................................
SECTION 44 - TWO-WHEEL DRIVE AXLE AND WHEELS 30...............
SECTION 50 - CLIMATE CONTROL 32...................................
SECTION 55 - ELECTRICAL SYSTEMS 33...............................
SECTION 90 - PLATFORM, CAB, AND BODYWORK 40....................
The following pages are the collation of the contents pages from each section and
chapter of the 70/70A Series Repair manual.
The sections used through out all New Holland product Repair manuals may not be
used for each product. Each Repair manual will be made up of one or several books.
Each book will be labeled as to which sections are in the overall Repair manual and
which sections are in each book.
The sections listed above are the sections utilized for the 70/70A Series Tractors.
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2
SECTION 00 - GENERAL INFORMATION
BOOK 1 - 87018723
Chapter 1 - General Information
CONTENTS
Section Description Page
00 000 Forward 2......................................................................
Precautionary Statements 3.......................................................
Safety Precautions 4.............................................................
Health and Safety Precautions 7...................................................
Tractor Identification 14..........................................................
Service Techniques 21...........................................................
Sealer Specifications 23.........................................................
Hardware Torque Values 23......................................................
Lubrication 26..................................................................
Recommended Lubricants and Coolants 26.........................................
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 1 -- Engine and Lubrication System
CONTENTS
Section Description Page
10 000 Specifications 3..................................................................
Torque Values 12...............................................................
Grease and Sealants 14.........................................................
Special Tools 15................................................................
Description of Operation 16......................................................
Cylinder Head Assembly 22......................................................
Camshaft Assembly 22..........................................................
Crankshaft Assembly 22.........................................................
Connecting Rods 22.............................................................
Pistons 22.....................................................................
Manifolds 22...................................................................
Cylinder Block Assembly 22......................................................
Timing Gears 22................................................................
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3
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 1 -- Engine and Lubrication System (Continued)
CONTENTS
Section Description Page
Engine Lubrication 23...........................................................
Troubleshooting 27..............................................................
Disassembly and Repair 30......................................................
Cylinder Head 30...............................................................
Cylinder Head Reassembly 42....................................................
Additional Information 45.........................................................
Crankcase Front Cassette Seal 47................................................
Parts Affected 47...............................................................
Additional Information 47.........................................................
Removal of Old Style Seal and Installation of the New Cassette Seal 47................
Front Cassette Seal Removal 53..................................................
Engine Front Cover and Timing Gear 58...........................................
Oil Pan 60.....................................................................
Connecting Rods, Bearings, Pistons and Rings 61...................................
Cylinder Block Overhaul 64.......................................................
Piston Assembly Installation 69...................................................
Main Bearings, Flywheel and Crankshaft 70........................................
Rear Cover Plate 72.............................................................
Oil Pump 75....................................................................
Oil Filter Support Assembly 77....................................................
Crankshaft 78..................................................................
Camshaft 82...................................................................
Engine Timing Gears 84.........................................................
Engine Compression Test 85.....................................................
Test Procedure 85..............................................................
Test Reading 85................................................................
Test Conclusion 85..............................................................
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4
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 2 -- Cooling System
CONTENTS
Section Description Page
10 000 Specifications 2..................................................................
Description of Operation 4........................................................
Cooling System 4................................................................
Troubleshooting 6................................................................
Disassembly and Repair 7........................................................
Radiator 7......................................................................
Thermostat 9....................................................................
Temperature Warning Sender 10..................................................
Fan Blade 10...................................................................
Viscous Clutch Assembly 10......................................................
Fan Belt Tensioner 11............................................................
Idler Pulley 11...................................................................
Water Pump 12.................................................................
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 3 -- Induction System
CONTENTS
Section Description Page
10 000 Specifications 2..................................................................
Description of Operation 4........................................................
Air Cleaner 4....................................................................
Turbocharger 6..................................................................
Intercooler 9....................................................................
Troubleshooting 10..............................................................
Intercooler Leak Test 12.........................................................
Disassembly and Repair 13......................................................
Air Cleaner 13..................................................................
Turbocharger 15................................................................
Intercooler 21..................................................................
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5
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 4 -- Fuel System
CONTENTS
Section Description Page
10 000 Specifications 3..................................................................
Fuel System Torque Chart 4.......................................................
Special Tools 4..................................................................
Description of Operation 5........................................................
Testing and Diagnosis 19........................................................
Low Pressure Fuel System 20....................................................
Fuel Tank Valves 20.............................................................
Filter Inlet and Outlet Pressure Tests 20............................................
High Pressure Fuel System 25...................................................
Injection Timing Check 25........................................................
Fuel Injector Nozzle Check 28....................................................
Injector Assembly Bench Testing 28...............................................
Preliminary Setup Procedure 29...................................................
Perform Opening Pressure Test 29................................................
Perform Nozzle Seat Leakage Test 30.............................................
Perform Chatter and Spray Pattern Test 31.........................................
Surging 31.....................................................................
Fuel Shutoff Diagnosis 32........................................................
Shutoff Solenoid Specifications 32.................................................
Preliminary Checks 32...........................................................
Checking Electrical Feed 32......................................................
Adjustments 34.................................................................
Bleeding the Fuel System 34.....................................................
Adjustment of Foot and Hand Throttle Cables 35....................................
Adjustment of High Idle Speed 35.................................................
Adjustment of Low Idle and Antisurge 36...........................................
Removal and Installation 37......................................................
Fuel Lift Pump 37...............................................................
Fuel Shutoff Solenoid 38.........................................................
Fuel Injection Pump 39..........................................................
Fuel Injection Lines 47...........................................................
Low-pressure Fuel Injection Lines 47..............................................
High-pressure Fuel Lines 48......................................................
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6
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 4 -- Fuel System (Continued)
CONTENTS
Injector Leak-off Line 50.........................................................
Fuel Filter 51...................................................................
Fuel Filter Manifold 52...........................................................
Injection Nozzles 53.............................................................
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 5 -- Engine Removal
CONTENTS
Section Description Page
10 000 Specifications 2..................................................................
Description of Operation 3........................................................
Disassembly and Repair 4........................................................
Engine Removal 4...............................................................
Engine Installation 8..............................................................
SECTION 10 -- ENGINE
BOOK 1 - 87018723
Chapter 6 -- Fuel Tank Removal
CONTENTS
Section Description Page
10 000 Specifications 2..................................................................
Description of Operation 3........................................................
Disassembly and Repair 4........................................................
Lower Tank Removal 4...........................................................
Lower Tank Installation 5..........................................................
Top Tank Removal 6.............................................................
Top Tank Installation 6............................................................
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7
SECTION 21 -- TRANSMISSION
BOOK 1 - 87018723
Chapter 1 -- Operation and Overview
CONTENTS
Section Description Page
21 000 Specifications 2..................................................................
Powershift Transmission 2........................................................
Gear Ratios 2...................................................................
Ground Speed 3.................................................................
Electrical System 5...............................................................
Description of Operation 6........................................................
Transmission Housing 7..........................................................
Powershift Transmission Controls 8................................................
Digital Display 8.................................................................
Inching Pedal 9..................................................................
Starting the Engine and Moving Forward 10........................................
Starting the Engine and Moving in Reverse 11.......................................
Shuttle Operations 12...........................................................
Speed Matching 13.............................................................
Auto Shift 14...................................................................
Creeper Gears (optional) 15......................................................
Programmable Upshift - Downshift 15..............................................
Transmission Components 17....................................................
Clutches 17....................................................................
Speed Clutches 17..............................................................
Directional Clutches 21..........................................................
Clutch Engagement 22..........................................................
Troubleshooting and Diagnosis 33.................................................
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8
SECTION 21 -- TRANSMISSION
BOOK 1 - 87018723
Chapter 2 -- Separating the Engine and Front Axle from the
Transmission
CONTENTS
Section Description Page
21 000 Specifications 2..........................................................
Special Tools 2..................................................................
Description of Operation 3........................................................
Disassembly and Repair 4........................................................
Engine and Side Rail Separation from the Transmission 4.............................
Four-wheel Drive Shaft Removal (if equipped) 8......................................
Engine and Side Rail Reassembly 10..............................................
SECTION 21 -- TRANSMISSION
BOOK 1 - 87018723
Chapter 3 -- Separating the Rear Axle from the Transmission
CONTENTS
Section Description Page
21 000 Specifications 2..................................................................
Special Tools 2..................................................................
Description of Operation 3........................................................
Disassembly and Repair 4........................................................
Rear Axle to Transmission Separation 4.............................................
Reassembly 8...................................................................
MInimum Hardware Tightening Torques 9...........................................
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9
SECTION 21 -- TRANSMISSION
BOOK 1 - 87018723
Chapter 4 -- Mechanical System
CONTENTS
Section Description Page
21 000 Specifications 2..................................................................
Torque Specifications 3...........................................................
Special Tools 4..................................................................
Description of Operation 5........................................................
Troubleshooting and Diagnosis 6...................................................
Disassembly and Repair 7........................................................
Removal and Disassembly 7......................................................
Rear Housing and Directional Clutches - Removal 8..................................
Front Housing and Speed Clutches - Removal 12...................................
Main Input Gear Assembly - Removal 14...........................................
Speed Clutches - Disassembly 16.................................................
Speed Clutches - Inspection 21...................................................
Directional Clutches - Disassembly 23.............................................
Directional Clutches - Inspection and Overhaul 26...................................
Speed/Directional Clutch - Reassembly 27.........................................
Main Input Gear and Oil Seal - Disassembly Inspection, Overhaul
and Reassemble 29..........................................................
Two Gear Clusters in Front and Rear Housing - Disassembly,
Inspection and Reassembly 30................................................
Front and Rear Housings and Center Section - Inspection and Overhaul 30.............
Torque Limiting Clutch and Sprung Damper Hub Drive Assembly -
Removal, Inspection and Replacement 32......................................
Reassembly 33.................................................................
Speed Clutches and Front Housing 33.............................................
Directional Clutches and Rear Housing 34..........................................
Transmission Shimming 36.......................................................
Front Housing Shimming 36......................................................
Rear Housing Shimming 37......................................................
Shimming the Output Shaft 38....................................................
Creeper Gear 39................................................................
Creeper Gear Repair 41.........................................................
Installation 44..................................................................
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10
SECTION 21 -- TRANSMISSION
BOOK 1 - 87018723
Chapter 5 -- Hydraulic System
CONTENTS
Section Description Page
21 000 Specifications 3..................................................................
Low-pressure Hydraulic System 3..................................................
Special Tools 4..................................................................
Description of Operation 5........................................................
Regulator Valve Operation 7.......................................................
Clutch Valve Operation 7..........................................................
Modulator Valve Operation 8......................................................
Electro-hydraulic Pilot Line 9......................................................
Troubleshooting and Diagnosis 10.................................................
70/70A Series Transmission Test Sheet 11..........................................
Electrical/Electronic System Checks 11.............................................
Hydraulic System Checks 13.....................................................
Clutch Apply Pressure Chart 14...................................................
Pressure Testing and Adjustments 15.............................................
Clutch Apply Circuit Pressure Testing 17...........................................
Transmission Pressure Checklist 19...............................................
Transmission Programming 21....................................................
Programming the Programmable Upshift, Downshift 21...............................
Programming Reverse Gear Ratios 23.............................................
Transmission Calibration 25......................................................
Check Powershift Transmission Clutch Calibration 25................................
Calibration Review 26...........................................................
Calibrate F1 Directional Clutch 26.................................................
Calibrate F2 Directional Clutch 27.................................................
Calibrate Reverse Directional Clutch 27............................................
Exit Calibration Mode 28.........................................................

11
SECTION 21 -- TRANSMISSION
BOOK 1 - 87018723
Chapter 6 -- Electrical System
CONTENTS
Section Description Page
21 000 Specifications 2.................................................................
Electrical System 2...............................................................
Description of Operation 3........................................................
Clutch Apply Circuits 4............................................................
Modulation Solenoids 4...........................................................
Shift Control Lever 5.............................................................
Inching Pedal 6..................................................................
Speed Sensors 6, 10............................................................
Display Module 6................................................................
Troubleshooting and Diagnosis 7...................................................
Transmission Solenoid and Pressure Testing 8.......................................
Disassembly and Repair 9........................................................
Control Valve Solenoids 9.........................................................
Chassis Control Module 11........................................................
Inching Pedal Switches 12.......................................................
Transmission Shift Control 14.....................................................
Calibration of Shift Constant 28...................................................
Disassembly and Repair 31......................................................
Removal and Disassembly 31....................................................
Removal of the Complete Valve Assembly from the Tractor 31........................
Disassembly 33.................................................................
Solenoid and Valve Assembly 34..................................................
Speed and Directional Clutch Circuit Valves 34......................................
Modulator Valves 35.............................................................
Regulator Valve 37..............................................................
Lubrication and Cooling Circuit Relief Valve 39......................................
Removal 39....................................................................
Installation 39..................................................................
Inspection 40...................................................................
Reassembly 40.................................................................
Installation 41..................................................................

12
SECTION 23 -- DRIVE LINES
BOOK 2 - 87018724
Chapter 1 -- Four-wheel Drive Clutch
CONTENTS
Section Description Page
23 202 Description of Operation 2........................................................
70 Series FWD Electronic Control Operation 4.......................................
70A Series FWD Electronic Control Operation 5......................................
Engaging and Disengaging Four Wheel Drive 5......................................
FWD Operating Precautions 5.....................................................
Disassembly and Repair 8........................................................
Removal 8...................................................................
Disassembly 12.............................................................
Inspection 13...............................................................
Reassembly 15.............................................................
Installation 18...............................................................
Pressure Testing 23..........................................................
SECTION 25 -- FRONT MECHANICAL DRIVE
BOOK 2 - 87018724
Chapter 1 -- Four-Wheel Drive Dana Axle
CONTENTS
Section Description Page
25 000 Specifications 2.................................................................
Special Tools 4..................................................................
25 100 Description of Operation 6........................................................
Troubleshooting 15..............................................................
41 106 Adjustments 16................................................................
41 106 Wheel Toe-in 16.............................................................
25 108 FWD Steering Stop 17.......................................................
25 108 Hub Bearing Preload Adjustment 18............................................
25 102 Check for Correct Pinion to Ring Gear Tooth Contact 21..........................
25 102 Wrong Tooth Contact Pattern 21...............................................
25 108 Swivel Pin Bearing Adjustment 23..............................................
25 104 FWD Ratios 23..............................................................

13
SECTION 25 -- FRONT MECHANICAL DRIVE
BOOK 2 - 87018724
Chapter 1 -- Four-Wheel Drive Dana Axle (Continued)
CONTENTS
Section Description Page
25 104 FWD Tire vs Gear Ratios 24..................................................
Four Wheel Drive Lead Factor 28..............................................
Front Axle Serviceability 30.......................................................
00 400 Lubrication 30...............................................................
Disassembly and Repair 35......................................................
25 100 Front Axle 35...............................................................
41 216 Steering Cylinders 38........................................................
25 108 Planetary Reduction 40.......................................................
25 108 Hub 44....................................................................
25 108 Swivel Housing 47..........................................................
25 108 Center Housing Swivel Bearing 50.............................................
25 108 Drive Shaft 51..............................................................
25 108 Outer Yoke 54...............................................................
25 102 Differential 56..............................................................
25 102 Crown Wheel to Backlash Adjustment 69.......................................
SECTION 25 -- FRONT MECHANICAL DRIVE
BOOK 2 - 87018724
Chapter 2 -- Dana SupersteerLinkage
CONTENTS
Section Description Page
25 100 Description of Operation 2........................................................
25 100 Supersteer Linkage Removal 3....................................................
25 100 Removal of Rear Support Assembly and Spherical Ball Bushing 5......................
41 106 Supersteer Linkage Adjustment 9..................................................

14
SECTION 25 - FRONT MECHANICAL DRIVE
BOOK 2 - 87018724
Chapter 3 - Four Wheel Drive Carraro Axle
CONTENTS
Section Description Page
Specifications 2..................................................................
Special Tools 3..................................................................
General Information 7............................................................
Front Axle Differential Line 8.......................................................
Overall Dimensions 11............................................................
General Checks Prior to Disassembly 16...........................................
Disassembly Operations 17......................................................
25 100 Front Axle Removal/Installation 17................................................
41 216 Steering Cylinders Group Disassembly 17..........................................
41 216 Steering Cylinders Group Assembly 23............................................
25 310 Final Drive Removal 25..........................................................
25 108 Wheel Hub Disassembly 27......................................................
25 108 Wheel Hub Assembly 29.........................................................
25 108 Swivel Housing Removal 32......................................................
25 100 Swivel Housing Assembly 33.....................................................
25 100 Axle Housing Swivel Bearing 34...................................................
25 102 Differential Support Group Disassembly 36.........................................
25 102 Differential Support Group Assembly 38............................................
25 102 Input Flange End Play Adjustment 39..............................................
25 102 Limited Slip Differential Removal 40...............................................
25 102 Limited Slip Pinion Disassembly 41................................................
25 104 Limited Slip Differential Disassembly 43............................................
25 104 Limited Slip Differential Assembly 45...............................................
25 102 Lockable Differential Removal 48..................................................
25 102 Lockable Pinion Disassembly 50..................................................
25 104 Lockable Differential Disassembly 52..............................................
25 104 Lockable Differential Assembly 54.................................................
25 102 Adjustment - Pinion Shaft 57......................................................
25 104 Differential - Adjustments 61......................................................
25 102 Pinion to Ring Gear Tooth Contact Adjustment 64...................................
Wrong Tooth Contact Pattern 64..................................................
25 108 Swivel Housing Bearing Adjustment 66.............................................
41 106 Standard Steer/Toe-In Adjustment 67..............................................
41 106 Supersteer Linkage Adjustment 68................................................
25 108 Potentiometer Removal 70.......................................................
25 108 Potentiometer Installation 70......................................................
25 108 Potentiometer Calibration 72......................................................
Mode 12: Tractor Features Configuration 72........................................
Mode 13: Steering Angle Sensor Operation/Calibration 73............................
New Parameter Code 74.........................................................
New Fault Codes 77.............................................................
Testing After Assembly 78........................................................
Troubleshooting 79..............................................................

15
SECTION 27 -- REAR DRIVE AXLE
BOOK 2 - 87018724
Chapter 1 -- Rear Axle Assembly
CONTENTS
Section Description Page
27 000 Specifications 2..................................................................
Special Tools 3..................................................................
Description of Operation 10......................................................
Differential Carrier 12............................................................
Final Reduction Drive 13.........................................................
Differential Lock Mechanical Operation 14..........................................
70 Series Differential Lock Control System Operation 15.............................
70A Series Differential Lock Control System Operation 16............................
Differential Lock Electrical Circuit Operation 17......................................
Differential Lock Hydraulic Circuit Operation 19.....................................
Front Axle Differential Line 19.....................................................
Troubleshooting 21..............................................................
Adjustments 30.................................................................
Disassembly and Repair 51......................................................
27 100 Axle Assembly 51...........................................................
27 120 Axle Housing 64.............................................................
27 120 Planetary Overhaul 85.......................................................
Axle Seal 91................................................................
Top Cover 93...............................................................
27 106 Differential Assembly 95......................................................
27 106 Pinion Assembly 112.........................................................
27 110 Differential Lock Solenoid 125.................................................
Pressure Testing 127.........................................................
Circuit Pressure Test 129.....................................................

16
SECTION 31 -- POWER TAKE-OFF
BOOK 3 - 87018725
Chapter 1 -- Mechanical System
CONTENTS
Section Description Page
31 000 Specifications 2..................................................................
Special Tools 3..................................................................
Description of Operation 4........................................................
Introduction 4...................................................................
Power Flow - All Models 5.........................................................
Engaging and Disengaging the PTO 7..............................................
Troubleshooting and Diagnosis 8...................................................
Disassembly and Repair 9........................................................
PTO Assembly - Removal and Installation 9.........................................
Upper PTO Input Shaft - Removal and Installation 15................................
PTO Output Shaft and Driven Gear - Overhaul 30...................................
PTO Clutch Assembly - Overhaul 39...............................................
SECTION 31 -- POWER TAKE-OFF
BOOK 3 - 87018725
Chapter 2 -- Electro-hydraulic System
CONTENTS
Section Description Page
31 000 Specifications 2..................................................................
Special Tools 3..................................................................
Description of Operation 4........................................................
Introduction 4...................................................................
Engaging and Disengaging the PTO 5..............................................
PTO Hydraulic System Operation 6.................................................
PTO Control Valve Operation 8....................................................
Lubrication Oil 12...............................................................
PTO Electrical System Operation 14...............................................
Troubleshooting 22..............................................................

17
SECTION 31 -- POWER TAKE-OFF
BOOK 3 - 87018725
Chapter 2 -- Electro-hydraulic System (Continued)
CONTENTS
Section Description Page
PTO will not Engage 23..........................................................
PTO will not Disengage 25.......................................................
PTO Clutch Slips Under Load 30..................................................
PTO Shaft Continually Turns Slowly with Engine Running
when PTO is Turned Off 32.......................................................
PTO Retaining Ring is Difficult to Replace 33.......................................
Adjustments 34.................................................................
PTO Clutch Brake Band 34.......................................................
Disassembly and Repair 35......................................................
PTO Solenoid 35...............................................................
PTO Control Valve Assembly 38..................................................
PTO System Pressure Testing 44.................................................
Introduction 44.................................................................
Pre-test Preparation 44..........................................................
Pilot Oil Circuit Pressure Test 45..................................................
Clutch Apply Circuit Pressure Test 46..............................................
PTO Lubrication Circuit Pressure Test 47...........................................
SECTION 33 -- BRAKES AND CONTROLS
BOOK 3 - 87018725
Chapter 1 -- Power Brakes
CONTENTS
Section Description Page
33 202 Specifications 2..................................................................
Description of Operation 4........................................................
Boosters 7......................................................................
Master Cylinders 11..............................................................
Rear Axle Brake Assemblies 15...................................................
Four Wheel Braking 17..........................................................
Troubleshooting 18..............................................................

18
SECTION 33 -- BRAKES AND CONTROLS
BOOK 3 - 87018725
Chapter 1 -- Power Brakes (Continued)
CONTENTS
Section Description Page
Adjustments 21.................................................................
Bleeding the Brakes 21..........................................................
Brake Pedal Adjustment 25.......................................................
Brake Switch Adjustment 25......................................................
Disassembly and Repair 26......................................................
Power Brake Valve - Overhaul 26.................................................
Inspection 33...................................................................
Reassembly 34.................................................................
Installation of the Brake Lube Kit 39...............................................
Rear Axle Brakes - Overhaul 44...................................................
Hydraulic Trailer Brake SEE SECTION 35...........................................
SECTION 33 -- BRAKES AND CONTROLS
BOOK 3 - 87018725
Chapter 2 -- Parking Brake
CONTENTS
Section Description Page
33 110 Specifications 2..................................................................
Special Tools 2..................................................................
Description of Operation 3........................................................
Adjustments 4...................................................................
Adjust the Park Brake 4...........................................................
Troubleshooting 5................................................................
Disassembly and Repair 6........................................................
Parking Brake - Overhaul 6........................................................

19
SECTION 33 -- BRAKES AND CONTROLS
BOOK 3 - 87018725
Chapter 3 -- Trailer Air Brakes
(Not Used in North America)
CONTENTS
Section Description Page
33 000 Specifications 2..................................................................
Torque Specifications 3...........................................................
Safety 7........................................................................
General Air Brake Safety 7........................................................
General Maintenance Instructions 7................................................
Description of Operation 8........................................................
System Operation 9..............................................................
Air Compressor 10..............................................................
Unloader Valve 10..............................................................
Reservoir Tank 14...............................................................
Right Hand Brake Lamp Switch 14................................................
Solenoid Valve 14...............................................................
Dual Control Valve 15...........................................................
Single Control Valve 20..........................................................
Air Pressure Switch 24..........................................................
Trailer Brake Solenoid Power 24..................................................
Disassembly and Repair 25......................................................
Air Compressor 25..............................................................
Air Compressor Lubrication Supply Line 29.........................................
Air Compressor Lubrication Return Line 29.........................................
Air Pressure Supply LIne 32......................................................
Unloader/Valve Silencer 33.......................................................
Reservoir 34...................................................................
Pressure Switch 34.............................................................
Single Control Valve 35..........................................................
Dual Control Valve 38...........................................................
Solenoid Control Valve 39........................................................
Coupler Connectors 41..........................................................
Adjustments 42.................................................................
Adjusting the Air Brake Parking Brake 42...........................................
System Testing 44..............................................................
Troubleshooting - Air Brake System 47.............................................
Towed Vehicle 51...............................................................
Troubleshooting - Towed Vehicle 52...............................................