New holland cx740 combine harvesters service repair manual

Information about New holland cx740 combine harvesters service repair manual

Published on January 24, 2020

Author: ujdjfjjskekmm



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

2. REPAIR MANUAL CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 2 4/7/2006


4. PARKING BRAKE Hydraulic D.32.C BODY AND STRUCTURE E 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 TOOL POSITIONING G LIFTING G.10.A LEVELLING G.30.A CROP PROCESSING K FEEDING Reel feeding K.25.B FEEDING Header feeding K.25.D FEEDING Feeder housing K.25.E THRESHING Conventional threshing K.40.B SEPARATING Beating K.42.B SEPARATING Rotary separator K.42.C SEPARATING Straw walker K.42.E SEPARATING Straw flow beater K.42.F STORING AND HANDLING Grain storing K.60.B CLEANING Primary cleaning K.62.B CLEANING Tailings return system K.62.C RESIDUE HANDLING Straw chopper K.64.C RESIDUE HANDLING Spreader K.64.D RESIDUE HANDLING Chaff blower K.64.F 2 4/7/2006

5. UNLOADING Grain unloading K.72.B 2 4/7/2006

6. INTRODUCTION 604_34_001_06 2 4/7/2006 1

7. 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. The manufacturer and all the organizations of its distribution chain, including - without limitation - national, regional or local dealers, reject any responsibility for damages due to the anomalous behavior of parts and/or components not approved by the manufacturer himself, including those used for the servicing or repair of the product manufactured or marketed by the Manufacturer. In any case, no warranty is given or attributed on the product manufactured or marketed by the Manufacturer in case of damages due to an anomalous behavior of parts and/or components not approved by the Manufacturer. No reproduction, though partial of text and illustrations allowed 604_34_001_06 2 4/7/2006 3

8. 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. ROTATING SHAFT SEALS For correct rotating shaft seal installation, proceed as follows: • before assembly, allow the seal to soak in the oil it will be sealing for at least thirty minutes • thoroughly clean the shaft and check that the working surface on the shaft is not damaged • position the sealing lip facing the fluid; with hydrodynamic lips, take into consideration the shaft rotation direction and position the grooves so that they will deviate the fluid towards the inner side of the seal • coat the sealing lip with a thin layer of lubricant (use oil rather than grease) and fill the gap between the sealing lip and the dust lip on double lip seals with grease • insert the seal in its seat and press down using a flat punch, do not tap the seal with a hammer or mallet • whilst inserting the seal, check that it is perpendicular to the seat; once settled, make sure that it makes contact with the thrust element, if required • to prevent damaging the seal lip on the shaft, position a protective guard during installation operations O-RING SEALS Lubricate the O-RING seals before inserting them in the seats, this will prevent them from overturning and twisting, which would jeopardise sealing efficiency. SEALING COMPOUNDS Apply one of the following sealing compounds on the mating surfaces marked with an X: RTV SILMATE, RHODORSIL CAF 1 or LOCTITE PLASTIC GASKET. Before applying the sealing compound, prepare the surfaces as follows: • remove any incrustations using a metal brush; • thoroughly de-grease the surfaces using one of the following cleaning agents: trichlorethylene, petrol or a water and soda solution. COTTER PINS When fitting split cotter pins, ensure that the pin notch is positioned in the direction of the force required to stress the pin. Spiral cotter pins do not require special positioning. 604_34_001_06 2 4/7/2006 4

9. INTRODUCTION PROTECTING THE ELECTRONIC/ ELECTRICAL SYSTEMS DURING CHARGING OR WELD- ING To avoid damage to the electronic/electrical systems, always observe the following: 1. Never make or break any of the charging circuit connections, including the battery connections, when the engine is running. 2. Never short any of the charging components to ground. 3. Always disconnect the ground cable from the battery before arc welding on the combine or on any header at- tached to the combine. • Position the welder ground clamp as close to the welding area as possible. • If welding in close proximity to a computer module, then the module should be removed from the combine. • Never allow welding cables to lay on, near or across any electrical wiring or electronic component while welding is in progress. 4. Always disconnect the negative cable from the battery when charging the battery in the combine with a battery charger. IMPORTANT: If welding must be performed on the unit, either the combine or the header (if it is attached), the battery ground cable must be disconnected from the combine battery. The electronic monitoring system and charging system will be damaged if this is not done. Remove the battery ground cable. Reconnect the cable when welding is completed. WARNING Battery acid causes severe burns. Batteries contain sulfuric acid. Avoid contact with skin, eyes or clothing. Antidote - EXTERNAL: flush with water. INTERNAL: drink large quantities of water or milk. Follow with milk of magnesia, beaten egg or vegetables oil. Call physician immediately. EYES: flush with water for 15 minutes and get prompt medical attention. 84-110 604_34_001_06 2 4/7/2006 5

10. REPAIR MANUAL DISTRIBUTION SYSTEMS CX720 , CX740 , CX760 , CX780 , CX820 , CX840 , CX860 , CX880 2 4/7/2006 A

11. 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. The oil enters the main frame valve block at the priority valve slice and there the oil is split, dependant on demand, to the steering valve, which has priority, or to the other hydraulic functions. The unloading tube control, drum variator control and header height control are served by the main frame stack. BSC1256B 1 The straw elevator and header reverser, lateral flotation control, reel vertical and horizontal adjustment and reel speed control are served by the straw elevator stack valve. The straw elevator stack valve is an extension of the main frame stack valve and is connected with pressure (31a), return (31b), and load sensing lines (31c), via quick release couplings. BSC1254A 2 The last section of the straw elevator stack valve is a flush valve. This valve allows a very small oil flow through the stack valves, when no services are being operated, allowing warm oil to bring the stack valve assembly gradually up to temperature. The circuit return oil flows through to the return side filter back to the pump or to the reservoir. The high pressure circuit is linked with the hydrostatic circuit. The hydrostatic pump (3) feeds the hydrostatic circuit. The charge return and case drain oil flows through to the thermostat and cooler back to the reservoir or high pressure circuit. BSC1256C 3 2 4/7/2006 A.10.A / 6

12. 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). Only when working in high demand conditions does the CCLS pump create an under pressure in the suction line. 2 4/7/2006 A.10.A / 7

13. DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM PRIMARY HYDRAULIC POWER SYSTEM - Overview (A.10.A - C.40.B.10) HIGH PRESSURE SYSTEM - COMPONENT LOCATION 1 Engine 2 Gearbox 3 Hydrostatic pump 4 CCLS pump 5 Low pressure gear pump 6 Load sensing valve 7 High pressure relief valve (197 bar (2856 psi) 8 In-line high pressure filter 9 Priority valve 10 Load sensing lock out valve 11 Load sensing shuttle valve 12 Steering motor 13 Steering cylinders 14 Header height pressure valve 15 High pressure relief valve 220 bar (3190 psi) 16 Accumulator lock out valve 17 Header suspension accumulator (70 bar [1015 psi], 0.5 L [17 oz]) 18 Pressure sensor 19 Header height control valve 20 Header raise valve 21 Header lower valve 22 Header pressure compensation valve 23 Header lift cylinders 24 Electronic control unit 25 Drum variator valve 26 Drum variator adjustment plunger 27 Unloading tube control valve 28 Unloading tube cylinder lock out 29 Unloading tube cylinder 30 Top plate 31 Quick attach couplers 32 Straw elevator stack valve top plate 33 Straw elevator and header reversing valve 34 Straw elevator and header reversing motor 35 Lateral flotation control valve 36 Lateral float pressure compensation valve 37 Lateral flotation cylinder 38 Lateral float accumulator (80 bar [1160 psi], 0.5 L [17 oz]) 39 Lateral float accumulator (100 bar [1450 psi], 0.5 L [17 oz]) 40 Lateral float minimum pressure valve 41 Reel horizontal adjustment valve 42 Reel horizontal adjustment cylinders 43 Reel vertical adjustment valve 44 Reel vertical adjustment cylinders 45 Reel drive / speed adjustment valve 46 (Not used) 47 Reel pressure compensation valve 48 Reel drive motor 49 Flush valve 50 Return filter with by-pass 51 Blocked filter indicator switch 52 Thermostat valve 53 Cooler 54 Suction filter 55 Filler cap with breather 56 Hydraulic oil, minimum level indicator 57 Reservoir 58 Drain hose 59 Temperature sensor 60 Multi-line quick coupler 2 4/7/2006 A.10.A / 8



16. 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. BSC1256C 1 (4) Closed Centre Load Sensing (CCLS) Pump Provides the oil for the high pressure system. Will supply the pressure as demanded by the services in use due to its load sensing and variable displacement capability. Has the advantage over a fixed pump in that it reduces the engine power absorbed when maximum pump flow is not required. BSC1256B 2 (5) Low Pressure Gear Pump Totally separate from the high pressure system. Mounted on the CCLS pump from where it takes its drive. BSC1256A 3 (6) Load Sensing Valve (mounted on CCLS pump) (7) High Pressure Relief Valve (mounted on CCLS pump) Output from the CCLS pump is determined by adjusting the angle of the swash plate. The load sensing valve senses the circuit operating pressure and adjusts the swash plate angle to control pump output. If pump output rises to 197 2 4/7/2006 A.10.A / 11

17. 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 4 (8) In Line High Pressure Filter A replaceable filter located between the CCLS pump output and the high pressure system priority valve. BSC1265A 5 (12) Steering Motor Supplied oil via the priority valve in the main frame stack. The steering motor directs and controls oil to the steering cylinders, based on input via movement of the steering wheel. There are 2 different motors available. An OSPF 315 cc load sensing fixed capacity unit for North America only and an OSPQ 160/320 cc load sensing variable capacity unit for all other locations. BSC1257A 6 (13) Steering Cylinders 2 4/7/2006 A.10.A / 12

18. DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1263A 7 (23) Header Lift Cylinder BSC1269A 8 2 4/7/2006 A.10.A / 13

19. DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1270A 9 Main Frame Stack Valve Assembly (9) 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. When the pressure in the load sense circuit or steering circuit exceeds a preset value the relief valve will blow and then maintain a maximum pressure in the load sense or steering circuits. (11) Load Sensing Shuttle Valve Located in each valve slice. Allows the function with the highest pressure demand to send sensing pressure to the load sensing valve on the CCLS pump. (14) Header Height Pressure Valve Controls the pressure within the header height cylinders. Contains the high pressure relief valve (15), accumulator lock out valve (16) and pressure sensor (18). (16) Accumulator Lock Out Valve Solenoid controlled valve which isolates the accumulator from the raise and lower circuit. (19) Header Height Control Valve Controls the raising and lowering of the header. Contains the PWM raise and lower valves and compensation valve. (20) Header Raise Valve A PWM controlled valve, allows pressure oil to the raise cylinder. (21) Header Lower Valve A PWM controlled valve, allows oil to be released from the lift cylinders under control. (22) Header Pressure Compensation Valve Ensures that height raise speed is consistent in all operating conditions, provides compensation to pressure spikes in the system. 2 4/7/2006 A.10.A / 14

20. 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. (27) Unloading Tube Control Valve Controls the unloading tube cylinder. Consists of two electrically operated solenoid valves. (15) High Pressure Relief Valve This acts as a shock relief valve for the header. Sudden rises in pressure, as felt at the lift cylinders, are relieved through this valve. BSC1255A 10 (17) Header Suspension Accumulator Absorbs the slight movement to the header encountered during normal operating. The accumulator is rated at 70 bar pressure with a volume of 0.5 L. BSC1255B 11 (18) Pressure Sensor Measures the hydraulic pressure within the header circuit. Sends a signal to the header electronic control unit. BSC1255C 12 (24) Electronic Control Unit Controls the header height via the PWM controlled raise and lower solenoids, based on the signal sent by the operator cab controls. 2 4/7/2006 A.10.A / 15

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22. DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1255D 13 (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 14 (28) Unloading Tube Lockout Block Isolates the unload cylinder from the control valve and pipework. Ensures that the unload tube will remain in the required position until the control valve is activated. When pressure oil is applied to the lock out block, a bleed line is supplied to the opposite side which releases the lock valve and allows oil to escape. When the pressure oil is removed the lock out valves close and prevent cylinder movement. (29) Unload Tube Cylinder Operates the unload arm, controlled by the unload tube control valve and lock out block. BSC1260A 15 (31) Quick Attach Couplers Connects the main stack valve block to the header valve block assembly. (31a) = Pressure supply (31b) = Return line (31c) = Load sensing line 2 4/7/2006 A.10.A / 16

23. 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. BSC1254A 16 BSC1271A 17 Straw Elevator Valve Stack (33) Straw Elevator and Header Reversing Valve Controls the motor for the straw elevator and header reverser. Contains two electrically controlled solenoids which move a spool to obtain forward, reverse or a float position on the motor. (35) Lateral Flotation Control Valve Controls the lateral flotation cylinder. Consists of two electrically controlled solenoids, a pressure compensation valve and a lock out valve. 2 4/7/2006 A.10.A / 17

24. 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. This is necessary because of the non-North American header being heavier on the left hand side. The valve is set at approximately 60 bar (870 psi). (41) Reel Horizontal Adjustment Valve (42) Reel Horizontal Adjustment Cylinders Controls the horizontal position of the reel. The valve consists of two electrically operated solenoids and a lock out valve. (43) Reel Vertical Adjustment Valve Controls the vertical adjustment cylinders. Consists of two electrically operated solenoids and a lock out valve. (44) Reel Vertical Adjustment Cylinders Two cylinders, a master and a slave, supplied oil from the vertical adjustment valve (43). The slave is powered by the rod end oil of the master cylinder. (49) Flush Valve When there are no services in use, charge pressure oil is allowed to join the return circuit through the flush valve. This function allows a flow of oil through the header stack valve thereby circulating warm oil through the valves. (34) Straw Elevator and Header Reversing Motor BSC1268A 18 (37) Lateral Flotation Cylinder Adjusts header angle in relation to the combine. (38) Lateral Float Accumulator - Lowering side - 50 bar (725 psi) (39) Lateral Float Accumulator - Raise Side - 75 bar (1088 psi) 2 4/7/2006 A.10.A / 18

25. DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM BSC1261A 19 (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 20 (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. A relief valve is incorporated to allow direct routing to the return circuit when the pressure is too high for the system to cope with. (53) Cooler Hydraulic oil cooler, mounted with the engine cooler on the right hand side of the vehicle. BSC1259A 21 (54) Suction Filter Located in the base of the reservoir in the suction line supplying the hydrostatic pump. (55) Filler Cap With Breather (56) Minimum level electrical switch for hydraulic oil reservoir. (high pressure system and hydrostatic system oil). 2 4/7/2006 A.10.A / 19

26. 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 22 (60) Header Hoses Quick Release Coupling. BSC1258A 23 2 4/7/2006 A.10.A / 20

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