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New Holland CX720 Repair Manual
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New Holland CX720 Repair Manual

New Holland CX720 Repair Manual

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REPAIR MANUAL
NEW HOLLAND
CX720
CX740
CX760
CX780
CX820
CX840
CX860
CX880

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Summary of Contents for New Holland CX720

  • Page 1 REPAIR MANUAL NEW HOLLAND CX720 CX740 CX760 CX780 CX820 CX840 CX860 CX880...
  • Page 2 Find manuals at https://best-manuals.com...
  • Page 3 REPAIR MANUAL CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 2 4/7/2006 Find manuals at https://best-manuals.com...
  • Page 4 Contents INTRODUCTION DISTRIBUTION SYSTEMS PRIMARY HYDRAULIC POWER SYSTEM A.10.A SECONDARY HYDRAULIC POWER SYSTEM A.12.A HYDRAULIC COMMAND SYSTEM A.14.A PNEUMATIC SYSTEM A.20.A ELECTRICAL POWER SYSTEM A.30.A LIGHTING SYSTEM A.40.A ELECTRONIC SYSTEM A.50.A POWER PRODUCTION ENGINE B.10.A FUEL AND INJECTION SYSTEM B.20.A AIR INTAKE SYSTEM B.30.A EXHAUST SYSTEM...
  • Page 5 PARKING BRAKE Hydraulic D.32.C BODY AND STRUCTURE SHIELD E.20.A OPERATOR AND SERVICE PLATFORM E.30.A USER CONTROLS AND SEAT E.32.A USER CONTROLS AND SEAT Operator seat E.32.C USER PLATFORM E.34.A ENVIRONMENT CONTROL Heating system E.40.B ENVIRONMENT CONTROL Air-conditioning system E.40.C ENVIRONMENT CONTROL Heating, ventilation and air-conditioning E.40.D SAFETY SECURITY ACCESSORIES Safety E.50.B...
  • Page 6 UNLOADING Grain unloading K.72.B 2 4/7/2006 Find manuals at https://best-manuals.com...
  • Page 7 INTRODUCTION 604_34_001_06 2 4/7/2006 Find manuals at https://best-manuals.com...

  • Page 8: Table Of Contents

    Contents INTRODUCTION Foreword ( - A.10.A.40) Basic instructions ( - A.90.A.05) Torque ( - A.90.A.10) Conversion factors ( - A.92.A.21) Product identification ( - A.80.A.10) 604_34_001_06 2 4/7/2006 Find manuals at https://best-manuals.com...

  • Page 9: Introduction

    INTRODUCTION Foreword ( - A.10.A.40) IMPORTANT INFORMATION All repair and maintenance works listed in this manual must be carried out only by staff belonging to the NEW HOL- LAND Service network, strictly complying with the instructions given and using, whenever required, the special tools. Anyone who carries out the above operations without complying with the prescriptions shall be responsible for the subsequent damages.

  • Page 10: Basic Instructions ( - A.90.A.05)

    INTRODUCTION Basic instructions ( - A.90.A.05) SHIMMING For each adjustment operation, select adjusting shims and measure individually using a micrometer, then add up the recorded values. Do not rely on measuring the entire shimming set, which may be incorrect, or the rated value indicated on each shim.
  • Page 11 INTRODUCTION PROTECTING THE ELECTRONIC/ ELECTRICAL SYSTEMS DURING CHARGING OR WELD- To avoid damage to the electronic/electrical systems, always observe the following: Never make or break any of the charging circuit connections, including the battery connections, when the engine is running. Never short any of the charging components to ground.
  • Page 12 Only genuine spare parts guarantee the same quality, duration and safety as original parts, as they are the same parts that are assembled during standard production. Only NEW HOLLAND genuine spare parts can offer this guarantee. When ordering spare parts, always provide the following information: Machine model (commercial name) and serial number •...

  • Page 13: Torque ( - A.90.A.10)

    INTRODUCTION Torque ( - A.90.A.10) Minimum hardware tightening torques Nm lb ft lb in for normal assembly applications un- less otherwise stated IMPORTANT: Shown below is the suggested initial torque tightening sequences for general applications, tighten in sequence from item 1 through to the last item of the hardware. df5019-1 Imperial hardware Nominal...
  • Page 14 INTRODUCTION Metric hardware Nominal CLASS 5.8 CLASS 5.8 CLASS 8.8 CLASS 8.8 CLASS 10.9 CLASS 10.9 LOCKNUT Size UNPLATED UNPLATED UNPLATED UNPLATED UNPLATED UNPLATED CL.8 w/CL8.8 BOLT 1.7 Nm 2.2 Nm 2.6 Nm 3.4 Nm 3.7 Nm 4.8 Nm 1.8 Nm 15 lb in 19 lb in 23 lb in...
  • Page 15 INTRODUCTION dave5019 604_34_001_06 2 4/7/2006...

  • Page 16: Conversion Factors ( - A.92.A.21)

    INTRODUCTION Conversion factors ( - A.92.A.21) Linear 1 mm 0.03937 in 1 in 25.4 mm 1 Km 0.6214 miles 1 mile 1.6093 km 0.3048 m 3.281 ft 1 ft Area 1 ha 2.471 acre 1 acre 0.4047 ha Volume 1 litre 0.0063 barrel 1 barrel 158.987 litre...

  • Page 17: Product Identification ( - A.80.A.10)

    Product identification ( - A.80.A.10) EXPLANATION OF MACHINE SERIAL NUMBERS Example : n° 221226001 221226001: The first two digits identify the model within a product line: CX720 = 20 CX740 = 21 CX760 = 22 CX780 = 23 CX820 = 33...
  • Page 18 INTRODUCTION 604_34_001_06 2 4/7/2006...
  • Page 19 REPAIR MANUAL DISTRIBUTION SYSTEMS CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 2 4/7/2006...
  • Page 20 DISTRIBUTION SYSTEMS - A PRIMARY HYDRAULIC POWER SYSTEM A.10.A CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 SECONDARY HYDRAULIC POWER SYSTEM A.12.A CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 HYDRAULIC COMMAND SYSTEM A.14.A...
  • Page 21 DISTRIBUTION SYSTEMS - A PRIMARY HYDRAULIC POWER SYSTEM - 10.A CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 2 4/7/2006 A.10.A / 1...
  • Page 22 Contents DISTRIBUTION SYSTEMS - A PRIMARY HYDRAULIC POWER SYSTEM - 10.A TECHNICAL DATA PRIMARY HYDRAULIC POWER SYSTEM Special tools (A.10.A - D.20.A.40) Hydraulic pump General specification (A.10.A.20 - D.40.A.10) FUNCTIONAL DATA PRIMARY HYDRAULIC POWER SYSTEM Static description (A.10.A - C.30.A.20) Overview (A.10.A - C.40.B.10) Component localisation (A.10.A - C.40.B.20) Hydraulic symbol (A.10.A - C.20.C.20)
  • Page 23 E0024-05-Hydraulic Reservoir Temp Line Disconnected (A.10.A.95.90 - G.30.B.50) CX720 Series 1206 - 1237, CX740 Series 1206 - 1237, CX760 Series 1206 - 1237, CX780 Series 1206 - 1237, CX820 Series 1206 - 1237, CX840 Series 1206 - 1237, CX860 Series 1206 - 1237, CX880 Series 1206 - 1237 E0024-05-Hydraulic Reservoir Temp Line Disconnected (A.10.A.95.90 - G.30.B.50)
  • Page 24 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Special tools (A.10.A - D.20.A.40) DESCRIPTION NEW HOLLAND PART NUMBER (All Markets Except North America) Blanking Cap 11/16 ORFS 297671 Pressure Gauge 0 - 10 bar (0 - 150 psi)
  • Page 25 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM Hydraulic pump - General specification (A.10.A.20 - D.40.A.10) MAIN HYDRAULIC PUMP Type Variable Flow Closed Centre Load Sensing Piston Pump Minimum Output @ engine rated speed 114 Ltr/min 30 US gal/min Standby Pressure 21 bar (305 psi) Maximum System Pressure 207 bar (3000 psi)
  • Page 26 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Static description (A.10.A - C.30.A.20) The high pressure circuit operates all of the work hydraulics and steering. The circuit is fed by a closed centre load sensing variable displacement pump (4). Oil is drawn by the pump, from the main reservoir, shared with the hydro- static system, through the inline pressure filter to the mainframe valve block.
  • Page 27 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM The CCLS pump uses the return oil from the hydrostatic system as its charge pressure oil and therefore does not incorporate a charge pump. The hydrostatic return oil comes into the pump via the oil cooler at the rate of 60 l/min (63 qts/min).
  • Page 28 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Overview (A.10.A - C.40.B.10) HIGH PRESSURE SYSTEM - COMPONENT LOCATION Engine Gearbox Hydrostatic pump CCLS pump Low pressure gear pump Load sensing valve High pressure relief valve In-line high pressure filter (197 bar (2856 psi) Priority valve Load sensing lock out valve...
  • Page 29 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1362B HIGH PRESSURE SYSTEM - COMPONENT LOCATION 2 4/7/2006 A.10.A / 9...
  • Page 30 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1361A HIGH PRESSURE SYSTEM - COMPONENT LOCATION 2 4/7/2006 A.10.A / 10...
  • Page 31 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Component localisation (A.10.A - C.40.B.20) NOTE: The reference numbers used in the illustrations and text relate to the identification numbers used on the High Pressure Circuit Diagram, PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic schema (A.10.A-C.20.B.20). (3) Hydrostatic Pump Although not part of the high pressure system, the return oil from the hydrostatic motors is used as charge pressure oil for the high pressure CCLS pump.
  • Page 32 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM bar (2857 psi) the high pressure relief valve over rides the load sensing valve and adjusts the swash plate angle to limit maximum system pressure. BSC1266A (8) In Line High Pressure Filter A replaceable filter located between the CCLS pump output and the high pressure system priority valve. BSC1265A (12) Steering Motor Supplied oil via the priority valve in the main frame stack.
  • Page 33 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1263A (23) Header Lift Cylinder BSC1269A 2 4/7/2006 A.10.A / 13...
  • Page 34 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1270A Main Frame Stack Valve Assembly Priority Valve Located in the main frame stack valve, receives the output oil from the CCLS pump and will provide steering with the priority for oil. Actuated by pressure within the load sense lines. (10) Load Sense / Steering Relief Valve Located in the priority valve.
  • Page 35 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM (25) Drum Variator Control Valve Controls the plunger within the variator drum drive unit to provide adjustable variator speed. Solenoid operated valves either allow pressure oil to provide a speed increase or release oil pressure to decrease speed.
  • Page 36 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1255D (26) Drum Variator Adjustment Plunger Operated via the drum variator valve, the plunger is a hydraulic cylinder that operates a floating disc within the variator assembly to alter variator speed. BSC1267A (28) Unloading Tube Lockout Block Isolates the unload cylinder from the control valve and pipework.
  • Page 37 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM NOTE: The return line must always be correctly connected. The quick attach coupler of the return line incorporates check valves allowing flow back to the main frame stack valve. If the engine is started with the return line disconnected oil will escape from the valve block.
  • Page 38 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM (36) Lateral Float Pressure Compensation Valve Ensures that lateral float operation is consistent in all operating conditions, provides compensation to pressure spikes in the system. (40) Lateral Float Minimum Pressure Valve This is a resistant valve and prevents the header from jerky counterclockwise movement and jerky operation when the cylinder is retracted.
  • Page 39 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1261A (50) Return Filter with Bypass (51) Return Filter Element Differential Drop Indicator. Electrical switch to indicate pressure differential as the filter becomes clogged during service. BSC1262A (52) Thermostat Valve Cooler bypass valve, directs cold oil away from the cooler and back into the return circuit. As the oil progressively warms up the oil is then allowed, by the thermostat valve, through the cooler.
  • Page 40 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM (57) Hydraulic Oil Reservoir (high pressure system and hydrostatic system oil). (59) Temperature Sensor Measures hydraulic oil temperature, high oil temperature indicated at 85 °C (185 °F). BSC1264A (60) Header Hoses Quick Release Coupling. BSC1258A 2 4/7/2006 A.10.A / 20...
  • Page 41 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic symbol (A.10.A - C.20.C.20) Engine Reservoir Hydraulic pump, direction Hydraulic pump single with variable displacement direction fixed displacement Hydraulic pump, directional Steering motor with displacement (bi-directional) Motor, single direction fixed Motor bi-directional fixed displacement displacement...
  • Page 42 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM Filter Filter opening Shuttle valve Temperature sender Pressure sensor 2 4/7/2006 A.10.A / 22...
  • Page 43 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM 2 4/7/2006 A.10.A / 23...
  • Page 44 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic schema (A.10.A - C.20.B.20) High Pressure circuit diagram 1a series 1206 - 1479 Engine Quick attach couplers Gearbox Straw elevator stack valve top plate Hydrostatic pump Straw elevator and header reversing valve CCLS pump Straw elevator and header reversing motor Low pressure gear pump...
  • Page 45 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1244A 2 4/7/2006 A.10.A / 25...
  • Page 46 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM High pressure circuit diagram - Main stack valve 1b series 1480 and above Engine Gearbox Hydrostatic pump CCLS pump Low pressure gear pump Load sensing valve High pressure relief valve (197 bar (2856 psi) In-line high pressure filter Priority valve Load sensing lock out valve...
  • Page 47 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM ZEIL06CX0002H0B 2 4/7/2006 A.10.A / 27...
  • Page 48 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM High pressure circuit diagram - Straw elevator stack valve 2b series 1480 and above Quick attach couplers Straw elevator stack valve top plate Straw elevator and header reversing valve Straw elevator and header reversing motor Lateral flotation control valve Lateral float pressure compensation valve Lateral flotation cylinder...
  • Page 49 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM ZEIL06CX0001G0B 2 4/7/2006 A.10.A / 29...
  • Page 50 DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM Hydraulic pump Variable displacement pump - Overview (A.10.A.20.02 - C.40.B.10) BSC1338A High Pressure CCLS Hydraulic Pump and Low pressure Gear Pump Installation 1 Flow and pressure compensating valves 6 Low pressure pump output tube 2 Load sensing line 7 Low pressure gear pump 3 CCLS pump casing...
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