The Liebherr MK 88 Mobile Construction Crane is usually earning money, not sitting in the yard, so when something’s down on the carrier you want to walk straight to the right box, valve, or plug. This Technical Information & BMK Components Manual for the MK 88 carrier (SN 047323) is what the tech on the ground grabs when a wiring diagram says “K15” and they’re standing there with a multimeter. It’s about component identification only – not how to fix it, not what to torque it to, just “what is it and where is it on the machine”.

What this manual helps you do

• Identify which physical component matches a reference like E1, K3, V12, or X45 on your Liebherr schematics.
• Locate carrier-mounted components on clear outline views of the chassis, axles, outriggers, and drive train area.
• Trace wiring and hydraulic references from diagrams to their real-world mounting points on the carrier frame.
• Cross-reference Liebherr component IDs to names used in other manuals, fault lists, or diagnostic tools.
• Pinpoint which box, sensor, valve, or connector you should open before you start testing or swapping parts.

Who this is for

This fits workshop techs, field service guys, electrical diagnostic engineers, fleet mechanics, and trainers who need to show new hires the layout. If you need repair procedures, test specs, or part numbers, you want a service manual and a parts catalogue instead.

FAQ

Q: Is the PDF clear and searchable?

A: Yes, these BMK PDFs are usually clean scans with readable diagrams and text you can search by component ID.

Q: Does it cover the crane upper or boom?

A: No, this BMK manual covers the carrier only – undercarriage, axles, outriggers, and chassis-mounted gear.

Q: Does it tie in with other Liebherr manuals?

A: Yes, the BMK is meant to be used alongside wiring diagrams, hydraulic schematics, service manuals, and parts catalogues to locate the actual parts.

Bottom line: If your main question is “Where is this carrier component on my MK 88?” this is exactly the right manual. If you’re after how to repair or which part to order, 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