The Liebherr MK 88 Mobile Construction Crane spends its life tight on city jobsites, where you don’t have time to guess which valve block or sensor is where. This Technical Information & BMK Components Manual for the carrier is what the workshop tech or field guy grabs when a wiring diagram says “K15” and you need to know where that actually sits on the chassis. Component identification matters when the crane’s blocking a street and you’ve got a multimeter in one hand and the laptop in the other. This BMK is about finding things fast, not about how to repair them.

What this manual helps you do

• Identify carrier components on the MK 88 using clear outline and layout diagrams tied to Liebherr’s BMK codes.
• Locate specific items on the undercarriage (sensors, valves, junction boxes, etc.) from their reference designators in wiring or hydraulic schematics.
• Trace a fault from a diagnostic code or schematic symbol to the exact physical component on the carrier.
• Cross-reference Liebherr naming and BMK IDs so you can talk the same language as the service manual and parts catalogue.
• Pinpoint component locations when training new techs on the MK 88 carrier layout for SN 047326–type machines.

Who this is for

This suits a workshop technician, field service tech, electrical diagnostic engineer, fleet mechanic, or training instructor who already uses Liebherr diagrams. If you need repair steps, torque specs, or part numbers, you want a service manual or parts catalogue instead, not this BMK.

FAQ

Q: Is the PDF clear and searchable?

A: Yes, this kind of BMK manual is supplied as a readable PDF with clear carrier layout diagrams suitable for screen or print use.

Q: Does it cover the whole crane?

A: No, it only covers the carrier (chassis/undercarriage); the upper crane body and boom are not included.

Q: Does it tie in with other Liebherr documents?

A: Yes, the BMK component IDs are meant to match the reference designators you see in Liebherr wiring diagrams, service information, and parts catalogues.

Bottom line: If you need to find and identify components on the Liebherr MK 88 carrier by their BMK codes, this is the right document. If you’re after how-to repair instructions or parts ordering, it’s not what you need.

Table of Contents:

Table of contents
Technical information
MK 88 from 047300 (KD-series 1004)
Overview of components with identification (BMK)
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► Chassis:……………………………………………………………………………….3
Lighting front and mirrors…………………………………………………………3
Lighting rear…………………………………………………………………………..4
Side view right and left…………………………………………………………….5
Sockets, warning signal sensor, button EMERGENCY STOP……….6
► Driver cab:……………………………………………………………………………8
Doors and windows, interior lighting………………………………………….8
Heating valves, screen wiper and washer………………………………….9
Ventilation and heat exchanger………………………………………………10
Control elements………………………………………………………………….. 11
Control elements centre console…………………………………………….12
BTB, Remote control module BTT………………………………………….13
Centre console – battery box, fuses…………………………………………14
Centre console – fuses…………………………………………………………..15
Centre console – I/O- modules, ECUs……………………………………..16
Centre console – relay……………………………………………………………17
Centre console – relays, fan, component carrier, resistor module..18
Centre console – voltage converter relay heating flange…………….19
Centre console – diagnosis plug, EMERGENCY STOP………………20
► Pneumatic system:……………………………………………………………..21
Air compressor and air dryer………………………………………………….21
Pressure reservoir………………………………………………………………..22
Pressure sensors and pressure switches…………………………………23
Solenoid valve for auxiliary users……………………………………………24
ABV – regulating valves…………………………………………………………25
Compressed air circuits – measuring points………………………………26
Disk brake system ……………………………………………………………….27
Overview brake pad control……………………………………………………28
Brake pad monitoring indicator……………………………………………….29
Brake relay-, overload protection valve……………………………………30
► Diesel engine D946 A7 -03 (eAGR) 04 (SCR) / -05 (SCRF):…….31
Overview drive assembly……………………………………………………….31
Installation diesel engine……………………………………………………….32
Engine control unit………………………………………………………………..33
Overview injection side………………………………………………………….34
Fuel pumps………………………………………………………………………….35
Fuel low pressure sensors……………………………………………………..36
Liebherr Daisy-Chain diesel injection system……………………………37
Injectors LCR-I S2………………………………………………………………..38
Type plates:…………………………………………………………………………38
Overview exhaust gas side…………………………………………………….39
Charge air sensors and -preheating………………………………………..40
Exhaust gas flap…………………………………………………………………..41
Exhaust gas turbo charger with wastegate……………………………….42
Overview flywheel side and generator……………………………………..43
Speed sensors……………………………………………………………………..44
Overview fan side…………………………………………………………………45
Cooling agent……………………………………………………………………….46
Oil circuit……………………………………………………………………………..47
Copyright by
liebherr
LWE – Customer Service – Documentation
Author: lweeng1 / Issue: 1/17/2020
MK 88 from 047300 (KD-series 1004) UW-02 • BMK – Overview of components 2 of 98
* = Customer‘s spec.
Note:
All stated pressures meet the values of April 2018!
Terminal resistor CAN-LIDEC (ECU-CAN2)……………………………..48
Terminal resistor engine-CAN (ECU-CAN2)……………………………..49
Diesel engine D946 A7 -03 (eAGR) / Power Band H:…………………50
External exhaust gas return eAGR………………………………………….50
Intercooler temperature sensor……………………………………………….51
► Exhaust gas system……………………………………………………………52
Exhaust gas after treatment SCRF – overview………………………….52
Exhaust gas after treatment SCRF – sensors……………………………53
Exhaust gas after treatment SCRonly / SCRF – urea tank………….54
Exhaust gas after treatment SCRonly / SCRF – tank sensor, lines.55
Exhaust gas after treatment SCRonly / SCRF – SCR pump module.. 56
Exhaust gas after treatment SCRonly / SCRF- exhaust gas flap…57
► Air filter system…………………………………………………………………..58
Air filter vacuum, shut off flap in suction air *…………………………….58
► Fuel system:……………………………………………………………………….59
Fuel prefilter and tank……………………………………………………………59
► Cooling system…………………………………………………………………..60
Cooler installation…………………………………………………………………60
► ZF shift gearbox Traxon 12 TX 2611 SO……………………………….61
Gearbox control……………………………………………………………………61
Intarder……………………………………………………………………………….62
► Hydraulic:…………………………………………………………………………..63
Hydraulic oil tank, temperature sensor and flow switch hydraulic oil.. 63
Hydraulic pumps – overview……………………………………………………64
► Drive train:………………………………………………………………………….65
Overview, shifting conditions………………………………………………….65
Distribution gearbox Kessler VG 2700 (two stage)…………………….66
Distribution gearbox – switch position………………………………………67
Transversal differential lock axle 2…………………………………………..67
Long.- and transv. differential lock…………………………………………..68
ABV, wheel speed sensors…………………………………………………….69
► Steering:…………………………………………………………………………….70
Oil supply, deficiency monitoring……………………………………………..71
Deficiency monitoring, metering connection centering pressure….72
► Active rear axle steering……………………………………………………..73
CAN-Valves (HAWE)…………………………………………………………….73
Measuring connections MP6, MP11………………………………………..75
Angle sensor………………………………………………………………………..76
Steering- and centering cylinder……………………………………………..77
► Support………………………………………………………………………………78
Inclination sensor………………………………………………………………….78
Support valves – right…………………………………………………………….79
Support valves – left………………………………………………………………80
Extension cylinder sliding beam……………………………………………..81
Support cylinder……………………………………………………………………82
Vario Base – sliding beam monitoring with rope length sensor…….83
Vario Base – monitoring………………………………………………………….84
► Axle suspension:………………………………………………………………..85
Level sensor- axle suspension……………………………………………….85
Valves for axle pressure compensation, blocked/sprung…………….86
Valve block – axle suspension right………………………………………….87
Valve block – axle suspension left……………………………………………88
► Special equipment:……………………………………………………………..89
Additional heating Thermo Pro 90…………………………………………..89
Air-conditioner………………………………………………………………………90
Device carrier* – lighting – hydraulic connection…………………………91
Device carrier* – hydraulic………………………………………………………92
Battery charger…………………………………………………………………….93
Camera color……………………………………………………………………….94

Liebherr Crane