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Part of the New Holland Repair Manuals.
This 638-page Cnh Baumaschinen Gmbh MH6.6 / MH8.6 Hydraulic Excavator Workshop Manual (OEM #604.13.562) covers both machines in the same 638 pages, no separate booklet needed. Open it and you get full electrical circuit diagrams with connector pin assignment tables, complete hydraulic circuit diagrams for the working, slewing, pilot-control, and travel circuits, plus a dedicated calibration section for the A8V main pump and A4V slewing pump. You also get fault code listings for the Esx, Pcs, and central control unit, laid out step by step instead of buried in a glossary. Fuse the ECU circuit correctly: the power supply runs through a 30A fuse, and the central electronic unit (A100) handles speed-changer motor M10 control. No more chasing a slewing fault with a test light and a guess. Search any keyword, jump straight to the bookmarked section, and get back under the machine.
What's Inside This Cnh Baumaschinen Gmbh MH6.6, MH8.6 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | 7-44 | Personal Safety, Before Starting Work, During Operation, Maintenance/servicing, Warning and Instruction Signs, Organizational Measures |
| Technical Data and Special Tools | 45-86 | Service Data General, Data Sheet for Cylinders, Conversion Tables, Calculation Examples, Tightening Torques, Special Tools for Cylinders and Gearboxes |
| Machine Structure | 87-126 | Description of Machine (Boom-Adjusting), Switches/keys, Control Elements, Multifunction Display, Superstructure Components, Undercarriage Components |
| Electrical System | 127-202 | Fundamental Notions, Fuses, Electrical Circuit Diagrams, Layout of Electrical Components, Connector Pin Assignment Tables |
| Electronics | 203-254 | Electronic Control Unit, Power Supply, Components at CAN Bus, Esx Coding, Pcs: Power Control System, Pcs Components |
| Hydraulics | 255-442 | Hydraulic System Overview, Working/slewing/pilot-control Circuits, Hydraulic Circuit Diagrams, Drive Unit, Control Block, Pilot-Control System, Travel Circuit |
| Calibration | 443-472 | Measures to Be Taken on Main Pump A8V, Measures to Be Taken on Slewing Pump A4V, Display/service/calibration (Engine on), Display/service/calibration (Engine Off) |
| Troubleshooting and Repair | 473-492 | General Information on Fault Codes, Fault Codes Esx, Fault Codes Pcs Unit, Fault Codes Central Unit |
| Repair Instructions | 493-636 | Generalities, Welding Operations, Depressurizing Hydraulic System, Superstructure Components, Undercarriage Components, Equipment Components, Wear Parts |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Central electronic unit | A100 | p. 208 |
| Hydraulic system described according to the power flow in the machine and the individual functions and combined functions | 3 parts | p. 207 |
| Engine control unit (ECU) power supply | 30A fuse | p. 215 |
| Central electronic unit, including for the control of the speed-changer motor M10 | CU | p. 235 |
| Hydraulic oil temperature sensor, hydraulic system | R14 | p. 235 |
| Proportional valve for output adjustment of main pumps A8V | Y10 | p. 235 |
| Max. coil current | 850 mA | p. 248 |
| Coil resistance at 20 °C | 18 Ω ± 0,2 Ω | p. 248 |
| Coil resistance at 20°C | 450 Ω+/-20 Ω | p. 244 |
Cnh Baumaschinen Gmbh MH6.6, MH8.6 Common Problems This Manual Covers
Cnh Baumaschinen MH6.6 hydraulic system pressure drops after 30 minutes with slow or no boom movement
Inspect the variable displacement twin pump 1 and 2 independently. If replacing components on the MH6.6, note the boom cylinder weight is exactly 215 kg for safe rigging on page 592. Torque the hydraulic oil temperature sensor to 20 Nm.
Manual Section: Repair Instructions p. 592Machine shuts down unexpectedly displaying central unit fault codes or ESX communication errors
Verify the engine control unit power supply on page 215 by testing the 30A fuse. Test the speed sensor coil resistance using a multimeter; it must read 450 Ω ± 20 Ω as specified on page 244. Inspect the 2 ESX controller CAN-Bus interfaces.
Manual Section: Electronics p. 215Engine overheats frequently during summer excavation jobs with loud cooling fan noise
Clean the combined radiator assembly covering the working hydraulics, diesel engine, and turbocharger charge air on page 351. Check the hydraulic oil temperature sensor on page 247 and torque it to exactly 20 Nm. Verify the speed-controlled gearwheel motor turns smoothly.
Manual Section: Hydraulics p. 351Excavator loses travel speed on inclines and tracks fail to counter-rotate smoothly
Test the travel circuit pressure and inspect the travel oil motor. Turn to page 326 to verify the maximum suction volume Vgmax reaches 140 cm³/rev during operation. If volume drops below this threshold, rebuild or replace the travel motor to restore tracking power.
Manual Section: Hydraulics p. 326Frequently Asked Questions
What are the torque specifications for standard M12 bolts with material quality 12.9 and a total friction coefficient of 0.16 (L) on MH6.6 and MH8.6?
The tightening torque for standard M12 bolts with material quality 12.9 and a total friction coefficient of 0.16 (L) is 260 Nm. For other bolt sizes and material qualities, refer to the provided tables in the manual. p. 76
What is the part number for the main hydraulic pump unit on MH6.6 and MH8.6?
The main hydraulic pump unit is identified as a Variable displacement twin pump A 8 VO 107 LA1. Its part number is not explicitly listed as a separate item in the provided key, but the unit itself is referred to by this designation. p. 270
What is the procedure for removing the combined radiator on MH6.6 and MH8.6?
To remove the combined radiator, first secure the machine, shut off the engine, and depressurize the hydraulic system. Then, remove the battery box components, detach the hosepipes, loosen the screws (31) fixing the radiator to the frame, and lift the radiator slightly with a crane to disengage connecting pieces before lifting it out. p. 529
What is the tightening torque for the M18x2.5 hex socket screws on the boom cylinder for MH6.6?
For the MH6.6 boom cylinder, the tightening torque for M18x2.5 hex socket screws is 367 Nm, using a spanner size of 14 mm. p. 599
What format is this Cnh Baumaschinen Gmbh MH6.6, MH8.6, Hydraulic Excavator?
A 638-page Workshop Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this Cnh Baumaschinen Gmbh MH6.6, MH8.6, Hydraulic Excavator manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Can I find hydraulic circuit diagrams in this Cnh Baumaschinen Gmbh MH6.6?
Yes, this Cnh Baumaschinen Gmbh MH6.6, MH8.6, Hydraulic Excavator Workshop Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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