CASE CX800 Tier 3 Crawler Excavator Service Repair Manual.pdf
- 1. Copyright © 2006 CNH France S.A. Printed in France CNH Lep 9-42691EN September 2006 CX800 Tier 3 Crawler Excavators Table of Contents DIVISION/SECTION SECTION N° REFERENCE N° 1 GENERAL INFORMATION Safety, general information and standard torque data .....................................1001 7-27691EN General specifications and special torque setting............................................1002 9-94710EN 2 ENGINE Radiator and engine, removal and installation.................................................2001 9-94910EN Engine specifications ............................................................................................. * Disassembly and assembly of the engine.............................................................. * 3 FUEL SYSTEM Fuel tank ..........................................................................................................3001 9-36821EN Fuel engine system................................................................................................ * 4 ELECTRICAL SYSTEM Electrical system, electrical and electronic troubleshooting.............................4001 9-94700EN Inspection and maintenance of batteries and connecting a booster battery....4002 9-36830EN Main and engine electronic control boxes........................................................4003 9-94510EN 5 UNDERCARRIAGE Removal and installation of tracks ...................................................................5001 9-36860EN Rollers..............................................................................................................5003 9-36881EN Sprocket...........................................................................................................5004 9-36890EN Idler wheel and tension shock absorber ..........................................................5005 9-94350EN 6 DRIVE TRAIN Drive motor and final drive transmission removal and installation ...................6001 9-36980EN Drive motor and final drive transmission disassembly and assembly ..............6002 9-40351EN Swing reduction gear, removal and installation................................................6003 9-36991EN Swing reduction gear, disassembly and assembly...........................................6004 9-42631EN 7 UNDERCARRIAGE HYDRAULICS 8 UPPERSTRUCTURE HYDRAULICS Depressurising and decontaminating the hydraulic system, use of the vacuum pump and bleeding the components ..............................................8000 9-94430EN Specifications, troubleshooting, checks and hydraulic pressure settings.........8001 9-94740EN Hydraulic reservoir removal and installation ....................................................8002 9-94490EN Main and pilot pumps, removal and installation ...............................................8003 9-40771EN Main hydraulic control valve, removal and installation .....................................8004 9-94501EN Attachment cylinders, removal and installation................................................8005 7-27792EN Hydraulic swivel, removal and installation........................................................8006 9-94600EN Pilot blocs, removal and installation .................................................................8007 9-94520EN Swing motor, removal and installation..............................................................8008 9-94420EN Main hydraulic pump, disassembly and assembly ...........................................8010 9-94590EN Main hydraulic control valve, disassembly and assembly ................................8011 9-94781EN Attachment cylinders, disassembly and assembly...........................................8012 9-40941EN Hand control levers, disassembly and assembly .............................................8013 9-94630EN Foot control levers, disassembly and assembly...............................................8014 9-40992EN Six-solenoid valves, disassembly and assembly..............................................8015 9-42521EN Caution valve, disassembly and assembly.......................................................8016 9-94531EN Safety valve......................................................................................................8017 9-42770EN Hydraulic swivel, disassembly and assembly...................................................8018 9-42511EN Swing motor, disassembly and assembly ........................................................8019 9-42530EN Hydraulic functions...........................................................................................8020 9-94720EN
- 2. Lep 9-42691EN Edition 09-06 DIVISION/SECTION SECTION N° REFERENCE N° Fan motor, removal and installation .................................................................8022 9-94660EN Fan motor, disassembly and assembly ............................................................8023 9-94670EN Fan pump, removal, disassembly, assembly and installation...........................8024 9-94680EN Hydraulic component functions........................................................................8030 9-94130EN 9 UPPERSTRUCTURE Upperstructure, turntable and counterweight...................................................9002 9-42551EN Boom, dipper and bucket .................................................................................9003 9-42621EN Seat and seat belt............................................................................................9004 9-40960EN Cab and cab equipment...................................................................................9005 9-94650EN Air conditioning troubleshooting.......................................................................9006 7-xxxxxFR Air conditioning unit disassembly and assembly..............................................9007 9-94640EN Air conditioning servicing .................................................................................9008 7-xxxxxFR Air conditioning components............................................................................9009 7-xxxxxFR Removal and installation attachment, counterweight and side fram ................9010 9-94730EN Large format hydraulic schematic .................................................................Pocket 87520431 Large format electrical schematic .................................................................Pocket 9-93930 * Consult the Engine Service Manual Sections to be distributed at a later date NOTE: CNH Company reserves the right to make changes in the specifi- cation and design of the machine without prior notice and without incur- ring any obligation to modify units previously sold. The description of the models shown in this manual has been made in accordance with the technical specifications known as of the date of design of this document.
- 3. CNH Copyright © 2006 CNH France S.A. Printed in France February 2006 Lep 7-27691EN 1001 SAFETY, GENERAL INFORMATION AND TORQUE SPECIFICATIONS Section 1001
- 4. 1001-3 Lep 7-27691EN Issued 02-06 GENERAL INFORMATION Cleanning Clean all metal parts except bearings, in a suitable cleaning solvent or by steam cleaning. Do not use caustic soda for steam cleaning. After cleaning, dry and put oil on all parts. Clean oil passages with compressed air. Clean bearings in a suitable cleaning solvent, dry the bearings completely and put oil on the bearings. Inspection Check all parts when the parts are disassembled. Replace all parts that have wear or damage. Small scoring or grooves can be removed with a hone or crocus cloth. Complete a visual inspection for indications of wear, pitting and the replacement of parts necessary to prevent early failures. Bearings Check bearings for easy action. If bearings have a loose fit or rough action replace the bearing. Wash bearings with a suitable cleaning solvent and permit to air dry. DO NOT DRY BEARINGS WITH COMPRESSED AIR. Needle bearings Before you press needle bearings in a bore always remove any metal protrusions in the bore or edge of the bore. Before you press bearings into position put petroleum jelly on the inside and outside diameter of the bearings. Gears Check all gears for wear and damage. Replace gears that have wear or damage. Oil seals, O-rings and gaskets Always install new oil seals, O-rings and gaskets. Put petroleum jelly on seals and O-rings. Shafts Check all shafts that have wear or damage. Check the bearing and oil seal surfaces of the shafts for damage. Service parts Always install genuine Case service parts. When ordering refer to the Parts Catalog for the correct part number of the genuine Case replacement items. Failures due to the use of other than genuine Case replacement parts are not covered by warranty. Lubrication Only use the oils and lubricants specified in the Operator’s or Service Manuals. Failures due to the use of non-specified oils and lubricants are not covered by warranty.
- 5. 1001-4 Lep 7-27691EN Issued 02-06 SAFETY This symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED. The message that follows the symbol contains important information about safety. Carefully read the message. Make sure you fully understand the causes of possible injury or death. ! To prevent injury always follow the Warning, Caution and Danger notes in this section and throughout the manual. Put the warning tag shown below on the key for the keyswitch when servicing or repairing the machine. One warning tag is supplied with each machine. Additional tags Part Number 331-4614 are available from your service parts supplier . WARNING: Read the operator’s manual to familiarize yourself with the correct control functions. ! WARNING: Operate the machine and equipment controls from the seat position only. Any other method could result in serious injury. ! WARNING: This is a one man machine, no riders allowed. ! WARNING: Before starting engine, study Operator’s Manual safety messages. Read all safety signs on machine. Clear the area of other persons. Learn and practice safe use of controls before operating. It is your responsibility to understand and follow manufacturers instructions on machine operation, service and to observe pertinent laws and regulations. Operator’s and Service Manuals may be obtained from your Case dealer. ! WARNING: If you wear clothing that is too loose or do not use the correct safety equipment for your job, you can be injured. Always wear clothing that will not catch on objects. Extra safety equipment that can be required includes hard hat, safety shoes, ear protection, eye or face protection, heavy gloves and reflector clothing. ! WARNING: When working in the area of the fan belt with the engine running, avoid loose clothing if possible, and use extreme caution. ! WARNING: When doing checks and tests on the equipment hydraulics, follow the procedures as they are written. DO NOT change the procedure. ! WARNING: When putting the hydraulic cylinders on this machine through the necessary cycles to check operation or to remove air from a circuit, make sure all people are out of the way. !
- 6. 1001-5 Lep 7-27691EN Issued 02-06 WARNING: Use insulated gloves or mittens when working with hot parts. ! WARNING: Lower all attachments to the ground or use stands to safely support the attachments before you do any maintenance or service. ! WARNING: Pin sized and smaller streams of hydraulic oil under pressure can penetrate the skin and result in serious infection. If hydraulic oil under pressure does penetrate the skin, seek medical treatment immediately. Maintain all hoses and tubes in good condition. Make sure all connections are tight. Make a replacement of any tube or hose that is damaged or thought to be damaged. DO NOT use your hand to check for leaks, use a piece of cardboard or wood. ! WARNING: When removing hardened pins such as a pivot pin, or a hardened shaft, use a soft head (brass or bronze) hammer or use a driver made from brass or bronze and a steel head hammer. ! WARNING: When using a hammer to remove and install pivot pins or separate parts using compressed air or using a grinder, wear eye protection that completely encloses the eyes (approved goggles or other approved eye protectors). ! WARNING: Use suitable floor (service) jacks or chain hoist to raise wheels or tracks off the floor. Always block machine in place with suitable safety stands. ! WARNING: When servicing or repairing the machine, keep the shop floor and operator’s compartment and steps free of oil, water, grease, tools, etc. Use an oil absorbing material and/or shop cloths as required. Use safe practices at all times. ! WARNING: Some components of this machine are very heavy. Use suitable lifting equipment or additional help as instructed in this Service Manual. ! WARNING: Engine exhaust fumes can cause death. If it is necessary to start the engine in a closed place, remove the exhaust fumes from the area with an exhaust pipe extension. Open the doors and get outside air into the area. ! WARNING: When the battery electrolyte is frozen, the battery can explode if (1), you try to charge the battery, or (2), you try to jump start and run the engine. To prevent the battery electrolyte from freezing, try to keep the battery at full charge. If you do not follow these instructions, you or others in the area can be injured. !
- 7. 1002-30 Lep 9-94710EN Issued 06-06 700-2-01-00-15A 700-2-01-01-44AA 16 12 13 14 8 3 20 10 9 19 17 15 7 1 2 5 6 4 11 18 21 23 24 22 4 3 22 1 23 2 6 5 7 19
- 8. CNH Copyright © 2006 CNH France S.A. Printed in France September 2006 Lep 9-94910EN 2001 RADIATOR, OIL-COOLER, INTER COOLER, FUEL COOLER AND ENGINE REMOVAL AND INSTALLATION Section 2001
- 9. 2001-3 Lep 9-94910EN Issued 09-06 RADIATOR, OIL-COOLER, INTER COOLER AND FUEL COOLER Before carrying out any operation on the machine, perform the following operations in the order shown: - Park the machine on hard, flat ground. - Lower the attachment to the ground. - Shut down the engine. - Remove the starter switch key. - Make sure that pressure in the hydraulic system has been completely released (see Operator’s Manual). NOTE: For the removal and the installation of the radiator, oil cooler, inter cooler and fuel cooler refer to the figure 1, page 10. Removal STEP 1 Drain the cooling system (see Operator’s Manual). STEP 2 Release pressure in the hydraulic reservoir to allow the vacuum pump to be mounted (see Section 8000). Installation When installing, proceed in the reverse order from that of removal. Before operating the machine: - Check the oil level in the hydraulic reservoir. Top up if necessary. - Check the hydraulic fluid cooling circuit for leaks. - Fill and bleed the engine cooling system (see Oper- ator’s Manual). - Check the engine cooling system for leaks. WARNING: When the machine is working, the engine components and the hydraulic pump reach a high temperature. To avoid being burnt by hot metal or scalded by high temperature water or oil, allow the machine to cool down before starting any servicing operation. !
- 10. 2001-4 Lep 9-94910EN Issued 09-06 ENGINE Description B1 Coolant temperature sensor B3 Fuel temperature sensor B21 Engine oil pressure switch B47 Boost pressure sensor B49 Crankshaft position sensor (or engine speed sensor (flywheel mounted)) B50 Camshaft position sensor (or G sensor: cylinder recognition sensor (detects rotation of cam shaft)) B51 Boost temperature sensor B52 Common rail pressure sensor B49 B21 B51 B47 B1 B50 B3 B52
- 11. 2001-5 Lep 9-94910EN Issued 09-06 Removal and installation NOTE: For the removal and the installation of the engine refer to the figure 1, page 10. STEP 1 JS00163A Park the machine on hard, flat ground. Lower the attachment to the ground. STEP 2 Release pressure in the hydraulic system and in the hydraulic reservoir (see Section 8000). STEP 3 CT05L063 Disconnect the earth cable (-) (1) from the battery. STEP 4 CD01D131 Remove the screws (1) from the compressor and put it away from the engine. STEP 5 CRPH06A031A Disconnect the exhaust gas recirculation valve posi- tion sensor (B53) from the exhaust gas recirculation motor (M15). STEP 6 CRPH06A033A Label and disconnect the boost temperature sensor (B51) and the boost pressure sensor (B47). 1 1 M15 B53 B51 B47
- 12. 2001-6 Lep 9-94910EN Issued 09-06 STEP 7 CRPH06A034A Label and disconnect the electrical connections from the injectors. STEP 8 CRPH06A035A Label and disconnect the electrical supply to the glow plug (R1). STEP 9 CRPH06A037A Label and disconnect the connections from the com- mon rail pressure sensor (B52). STEP 10 CRPH06A038A Label and disconnect the coolant temperature switch (B1). STEP 11 CD00J031 Label and disconnect the electrical connections to the starter motor (M1). Remove the earth cable at the engine end. STEP 12 CRPH06A039A Label and disconnect the electrical connections of the fuel temperature sensor (B3). R1 B52 B1 M1 B3
- 13. 2001-7 Lep 9-94910EN Issued 09-06 STEP 13 CRPH06A040A Label and disconnect the supply pump valve PCV1 (Y33) and the supply pump valve PCV2 (Y34). STEP 14 CRPH06A041A Label and disconnect the electrical connections to the alternator (G2). STEP 15 CRPH06A042A Label and disconnect the engine oil pressure sensor (B21). CRPH06A043A Label and disconnect the camshaft position sensor (B50). STEP 16 CRPH06A044A Label and disconnect the crankshaft position sensor (B49). STEP 17 Remove all the clips, etc. which attach the electrical harnesses to the engine and move out of the way. STEP 18 Install a suitable lifting device on the engine lifting rings (for the weight of the engine, see Section 1002). STEP 19 Remove the engine retaining hardware. NOTE: When installing, make a visual inspection of the condition of the rubber flexible mountings and change them if necessary. Tighten the engine retain- ing screws to the torque specified in Section 1002. STEP 20 When there is nothing interfering with the removal of the engine, raise the engine carefully and install it on a suitable repair bench. Y33 Y34 G2 B21 B50 B49
- 14. 2001-8 Lep 9-94910EN Issued 09-06 STEP 21 Refer to Section 8003 and remove the hydraulic pump. STEP 22 Remove the silencer assembly with his bracket from the engine. NOTE: When installing, tighten the screws to a torque of 109 to 127 Nm. NOTE: When installing the engine in the machine, proceed in the reverse order from removal. Before operating the machine, carry out the following operations: - Bleed and prime the fuel system (see Operator’s Manual). - Fill and bleed the engine cooling system (see Oper- ator’s Manual). - Check the hydraulic, fuel and cooling systems for leaks. - Check the oil level in the hydraulic reservoir. Top up if necessary.
- 15. 3001-3 Lep 9-36821EN Issued 09-06 FUEL TANK Removal STEP 1 JS00163A Park the machine on hard, flat ground. Lower the attachment to the ground. STEP 2 Reduce the engine speed to idle for 30 seconds, then shut down the engine. STEP 3 Turn the ignition key to «ON» without starting the engine. STEP 4 Attach a «DO NOT OPERATE» tag to the ignition key in the cab. STEP 5 NOTE: The numbers within brackets refer to the fig- ures on pages 5 and 6. Remove the access panel (A) under the fuel tank (1). STEP 6 Open the filling plug (2) of the tank (1). Bleed the remaining fuel using the valve (3) then remove the latter. Remove the filter (19) and the fuel gauge (20). STEP 7 Remove the retaining screw (4) of the access ramp (5) then remove the access ramp (5). Remove the retaining screw (6) of the access ramp (12) then remove the access ramp (12). Remove the retaining screw (20) of the access ramp (21) then remove the access ramp (21). STEP 8 Attach identification tags on the electrical connec- tions of the fuel tank filler pump and disconnect them. STEP 9 Remove and seal all hoses of the fuel tank filler pump and remove the fuel tank filler pump. STEP 10 Remove the screws (8) and the protective plate (D) from on top of the fuel tank (1). Remove the screws (11) and the protective plate (C) from on top of the fuel tank (1). Remove the screws (10) and the protective plate (B) from on top of the fuel tank (1). STEP 11 Remove the front storage box (7). STEP 12 Attach labels on the hoses of the fuel tank and remove them. STEP 13 Shift the plastic protection (13) from the fuel sensor (14). Remove the retaining screws (15) then the fuel sensor (14) as well as the seal. STEP 14 Remove the screws (17) from the fuel tank (1), and the spacer (18). STEP 15 Remove the fuel tank (1) using a hoist. Remove the shims (22). STEP 16 See the operator's manual for removing the fuel filter.
- 16. 3001-4 Lep 9-36821EN Issued 09-06 Installation NOTE: The numbers within brackets refer to the fig- ures on pages 5 and 6. STEP 1 Using a hoist, position the fuel tank (1) on the machine. STEP 2 Install the shims (22) as well as the spacer (18) and the screws (17), tighten the screws to the torque specified on the section 1002. Install and tighten the valve (3). STEP 3 Install a new seal, then the fuel probe (14) using the five screws (15), reposition the plastic protection cor- rectly (13). STEP 4 Install the hoses by taking help of the labels attached during removal. Tighten using retaining clips. STEP 5 Install the front storage box. STEP 6 Install the fuel tank filler pump and connect al hoses. STEP 7 Install the protective plate (B) on top of the fuel tank (1). Tighten the screws (10). Install the protective plate (C) on top of the fuel tank (1). Tighten the screws (11). Install the protective plate (D) on top of the fuel tank (1). Tighten the screws (10). STEP 8 Install the access ramp (21) using the retaining screws (20). Install the access ramp (12) using the retaining screws (6). Install the access ramp (5) using the retaining screws (4). STEP 9 Fill the fuel tank (see the operator's manual) and make sure that there are no leaks. STEP 10 Reinstall the protective plate (A) under the fuel tank (1).
- 17. 3001-5 Lep 9-36821EN Issued 09-06 Description Location CRPH06A013G02 4 SCREW 5 ACCESS RAMP 6 SCREW 7 BOX 8 SCREW 10 SCREW 11 SCREW 12 ACCESS RAMP 20 SCREW 21 ACCESS RAMP 4 5 6 6 12 6 20 21 B C 7 1 D 8 11 10
- 18. 3001-6 Lep 9-36821EN Issued 09-06 Fuel tank CRPH06F010F 1 FUEL TANK 2 PLUG 3 VALVE 13 PLASTIC PROTECTION 14 FUEL PROBE 15 SCREW 17 SCREW 18 SPACER 19 FILTER 22 SHIM 1 3 13 14 15 18 17 20 19 2 A 22
- 19. 4001-7 Lep 9-94700EN Issued 06-06 ENGINE CONTROL Fuel Injection Control (Common rail type) 1. Process to determine quantity of fuel injection 1) System diagram Shovel Controller Basic fuel injection amount CAN communication Correction Engine coolant temperature correction Barometric Pressure Fuel temperature boost pressure correction Correction between cylinders Q-key correction QR correction Boost pressure sensor input CKP sensor input CMP or G sensor input Correction ECT Sensor input Engine control module (ECM) SCV or PCV opening time determination Injector coil energizing time Timing determination Common rail pressure sensor Common rail Fuel tank Supply pump SCV or PCV Injector coil Injector
- 20. 4001-8 Lep 9-94700EN Issued 06-06 2) Operation Engine controller (ECM) gets information (signal from mounted sensors) such as engine speed and engine load. Based on the information, ECM sends electric signals to supply pump and to injector to make a proper control of fuel injection quantity and injection timing for each cylinder. 1) Injection quantity control Based mainly on engine speed and load given to actual machine, Injection rate control is carried out for optimum injection by controlling fuel injector. 2) Injection pressure control Injection pressure is controlled by control of fuel pressure in the common-rail. The right pressure in the common-rail is calculated by using engine speed and fuel injection quantity. The supply pump and the pressure control valve are controlled according to the calculated pressure so that it can discharge proper quantity of fuel to pressure-feed into the common-rail for control. 3) Injection timing control The control substitutes timer function and an appropriate fuel injection timing is calculated by mainly using engine speed and fuel injection quantity to control the injector. 4) Injection rate control In order to improve fuel consumption in the cylinder, a small amount of fuel is injected (pre injection) for ignition at first, then 2nd time injection (main injection) into the ignited cylinder is carried out. In this control, the injection quantity control in section 1) and the injection timing control in section 3) are carried out by controlling injector.
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- 22. 4001-9 Lep 9-94700EN Issued 06-06 2. Mounting position of accessories related to engine 700.1.04.01.23AE2 A2 Engine controller B1 Coolant temperature sensor B3 Fuel temperature sensor B6 Air intake temperature sensor B47 Boost pressure sensor B48 Atmospheric pressure sensor B49 Crankshaft position sensor (or engine speed sensor (flywheel mounted)) B50 Camshaft position sensor (or G sensor: cylinder recognition sensor (detects rotation of cam shaft)) B51 Boost temperature sensor M9 Air conditioner condenser fan motor R5 Fuel sensor S62 Air cleaner sensor B1 B6 R5 B49 M9 B48 S62 A2 Engine harness connector EST connector ECM memory clear B47 B51 B3 B50
- 23. 4001-10 Lep 9-94700EN Issued 06-06 3. Appearances of accessories related to the Tier 3 emission control regula- tion A2. Engine controller (ECM) 700-1-04-01-23AF Controller for the engine meeting Tier 3 emission control regulation (hardware is common to the vehicle). Quantity of pin is 121 as against 104 for the engine meeting Tier 2 emission control regulation. In area indicated by an arrow, ISUZU part number and TRANSTRON part number, and serial number are recorded. B1. Coolant temperature sensor 700.1.04.01.23AG 1 Power, positive (+) 2 Power, negative (-) 3 For water temperature indicator (not in use) B3. Fuel temperature sensor 700.1.04.01.23AI B6. Intake air temperature sensor 700.1.04.01.23AH
- 24. 4001-11 Lep 9-94700EN Issued 06-06 B47. Boost pressure sensor 700.1.04.01.23AK B48. Atmospheric pressure sensor 700.1.04.01.23AJ 1 Power, positive (+) 2 Power, negative (-) 3 Output B49. Crankshaft position sensor 700.1.04.01.23AL B50. Camshaft position sensor (or G sen- sor) 700.1.04.01.23AM B51. Boost temperature sensor 700.1.04.01.23AH R5. Fuel level sensor 700.1.04.01.23AO S62. Vacuum sensor Operating negative pressure: 6.27 ± 0.29kPa. 700.1.04.01.23AN
- 25. 4001-12 Lep 9-94700EN Issued 06-06 GENERAL LOCATION OF THE COMPONENTS (INSIDE THE CAB) CS01M598A A1 Computer A2 Engine controller A4 Wiper controller B61 Sunload sensor A1 F21 A2 E52 S64 S53 S14 S51 S15 X8 R3 S1 P6 E4 E51 B61 A4 M3 S54 S16 P1 K10 K11 K32 K6 K3 K2 U1 K33 K5 S17 S13 S63
- 26. 4001-13 Lep 9-94700EN Issued 06-06 E4 Cab light E51 Cigarette lighter E52 Air conditioner F21 Fuse box K2 Relay-glow plug K3 Relay-horn K5 Relay-rotary light K6 Relay-air conditioner condenser fan K10 Relay-working light (upperstructure/attachment) K11 Relay-working light (cab) K32 Relay, hydraulic fan K33 Main relay M3 Wiper motor P1 Instrument panel P6 Air conditioner control panel R3 Throttle volume S1 Key switch S13 Overload switch S14 Breaker/crusher switch S15 Horn switch S16 One touch idle S17 Boom raising priority switch S51 Hydraulic function cancellation lever switch S53 Door limit switch S54 Front window limit switch S64 Cooling hydraulic motor switch U1 DC-DC (24 V-12 V) converter X8 Radio connector RELAYS AND MAIN FUSES (BATTERY COMPARTMENT) 700.1.04.07.20A2 1 Battery cable F22 Fuse 20 A; main fuse for F11 and F12 circuits F23 Fuse 65 A; main fuse for F3 to F10 and F13 to F20 circuits F24 Fuse 20 A; main fuse for F2 circuit F25 Fuse 20 A; main fuse for F1 circuit K7 Relay battery K8 Relay safety F25 F24 F22 K7 K8 F23 1