The Liebherr LTM 1090-4.2 Mobile Crane works hard on sites where downtime is expensive, so knowing exactly where each component sits is a big deal. When a fault code mentions “K15” or a wiring diagram shows “E1”, technicians reach for the BMK component identification manual, not the service book. The Technical Information & BMK Components Manual for SN 089504 helps you turn those abstract symbols into “that box, in that compartment, behind that cover.” That’s often the first step before any real troubleshooting or repairs can even start.

What this manual helps you do

• Identify which physical component matches a reference like E1, V12, K3, or X45 on your wiring or hydraulic diagrams.
• Locate sensors, valves, relays, junction boxes, and harness routes on both the carrier and the superstructure of the crane.
• Trace schematic items from electrical or hydraulic diagrams to their exact mounting position on the machine.
• Cross-reference Liebherr component designations with terms used in other manuals so your team talks about the same part.
• Pinpoint components during training so new techs learn the layout of the LTM 1090-4.2 quickly and stop guessing in the yard.

Who this is for

This BMK / component identification manual is aimed at workshop technicians, field service techs, electrical diagnostic engineers, fleet mechanics, and training instructors. If you need step‑by‑step repair procedures, torque values, or part numbers, you’re really looking for a service manual or a parts catalogue instead.

FAQ

Q: Are the diagrams clear and searchable in the PDF?

A: Yes, this kind of BMK manual is normally supplied as a readable PDF with clear component outlines and labels you can zoom and search.

Q: Does it cover both the carrier and the superstructure?

A: Yes, this product combines the BMK component identification for the carrier and the superstructure of the LTM 1090-4.2.

Q: Does it tie in with other Liebherr manuals?

A: Yes, the BMK diagrams and reference designators are designed to be used alongside Liebherr wiring diagrams, service manuals, and parts catalogues.

Bottom line: If your main goal is to find and name components on a Liebherr LTM 1090-4.2 using BMK codes, this is the right manual. If you expect repair instructions or parts lists, it’s not what you need.

Table of Contents:

► Chassis:………………………………………………………………………………….. 5
Lighting front and mirrors……………………………………………………………. 5
Lighting rear……………………………………………………………………………… 6
Side marker lights right………………………………………………………………. 7
Side marker lights left………………………………………………………………… 8
Sockets, warning signal sensor…………………………………………………… 9
Trailer coupling – voltage converter…………………………………………….. 10
Emergency stop*…………………………………………………………………….. 10
Immobiliser*……………………………………………………………………………..11
► Driver cab:…………………………………………………………………………….. 12
Control elements……………………………………………………………………… 12
Screen wiper and washer, heating valves…………………………………… 13
Ventilation and heating driver cab………………………………………………. 14
Air-conditioner…………………………………………………………………………. 15
Interior lighting, doors………………………………………………………………. 16
Basic unit – BTB
remote control module – BTT…………………………………………………….. 17
Control elements centre console……………………………………………….. 18
Telemetry FMS-interface…………………………………………………………… 19
Wiring loom – backup camera, radio…………………………………………… 19
Centre console – batteries, battery main switch,
Fuses battery box……………………………………………………………………. 20
Center console – I/O modules, BTB……………………………………………. 21
Centre console – fuses……………………………………………………………… 22
Centre console – relay………………………………………………………………. 23
Centre console – control units, interval relay………………………………… 24
Centre console – voltage converter, fan………………………………………. 25
Centre console – diagnosis plug………………………………………………… 26
► Pneumatic system:………………………………………………………………… 27
Air compressor and air dryer…………………………………………………….. 27
Pressure reservoir…………………………………………………………………… 28
Pneumatic valves in the driver cab…………………………………………….. 29
Brake relay- / overload protection valve……………………………………… 30
Filter and overflow valve / adapter valve…………………………………….. 31
Pressure sensors and pressure switches……………………………………. 32
Solenoid valve for auxiliary users………………………………………………. 33
Disk brake system…………………………………………………………………… 34
Disk brake system – brake pad control ………………………………………. 35
Brake pad monitoring indicator………………………………………………….. 36
ABV – regulating valves……………………………………………………………. 37
ABV – wheel speed sensors………………………………………………………. 38
Hill start assist (Hill Start Aid)…………………………………………………….. 39
Compressed air circuits – measuring points…………………………………. 40
Compressed air circuits – measuring points…………………………………. 40
► Overview drive assembly:………………………………………………………. 41
Installation view………………………………………………………………………. 41
Installation diesel engine …………………………………………………………. 42
Copyright by
liebherr
LWE – Customer Service – Documentation
Author: lweegm0 / Issue: 08.05.2020
LTM 1090-4.2 from 089400 (KD-series 1001) UW-02 • BMK – Component overview 2 of 118
► Diesel engine D946 A7 -03 (eAGR) 04 (SCR) / -05 (SCRF):……….. 43
Engine control unit…………………………………………………………………… 43
Overview injection side…………………………………………………………….. 44
Fuel pumps…………………………………………………………………………….. 45
Fuel low pressure sensors………………………………………………………… 46
Liebherr Daisy-Chain diesel injection system………………………………. 47
Injectors LCR-I S2…………………………………………………………………… 48
Type plates:……………………………………………………………………………. 48
Overview exhaust side……………………………………………………………… 49
Charge air sensors and -preheating…………………………………………… 50
Exhaust gas flap……………………………………………………………………… 51
Exhaust gas turbo charger with wastegate………………………………….. 52
Overview flywheel side and generator………………………………………… 53
Speed sensors………………………………………………………………………… 54
Overview fan side……………………………………………………………………. 55
Cooling agent………………………………………………………………………….. 56
Oil circuit………………………………………………………………………………… 57
Terminal resistor CAN-LIDEC (ECU-CAN2)………………………………… 58
Terminal resistor engine-CAN (ECU-CAN2)………………………………… 59
Diesel engine D946 A7 -03 (eAGR) / Power Band H:………………… 60
External exhaust gas return eAGR…………………………………………….. 60
Intercooler temperature sensor………………………………………………….. 61
Exhaust gas system………………………………………………………………. 62
Exhaust after treatment “SCRonly” – overview…………………………….. 62
Exhaust after treatment “SCRonly” – sensors………………………………. 63
Exhaust after treatment “SCRF” – overview…………………………………. 64
Exhaust after treatment “SCRF” – sensors………………………………….. 65
AdBlue tank with AdBlue tank gauge unit (extraction module)……….. 66
SCR-pump module and compressed air supply…………………………… 67
AdBlue lines and cooling water-heating valves……………………………. 68
► Air filter system:……………………………………………………………………. 69
Air filter vacuum, ventilation flap*……………………………………………….. 69
► Diesel fuel system:………………………………………………………………… 70
Fuel prefilter and tank………………………………………………………………. 70
► Cooling system:…………………………………………………………………….. 71
Cooler – fan drive, level sensor………………………………………………….. 71
► Sensor overview:…………………………………………………………………… 72
Temperature sensor (OBD)……………………………………………………….. 72
► Automated shift gearbox:………………………………………………………. 73
ZF-Traxon 12 TX 2611 SO (Intarder3)………………………………………… 73
Intarder 3, clutch actuation unit (ConAct)……………………………………. 74
► Hydraulic:……………………………………………………………………………… 75
Hydraulic oil tank…………………………………………………………………….. 75
Temperature sensor hydraulic oil, check valve…………………………….. 76
Hydraulic pumps – overview………………………………………………………. 77
Hydraulic pumps – crane hydraulic…………………………………………….. 78
► Drive train:…………………………………………………………………………….. 79
Overview………………………………………………………………………………… 79
Distribution gearbox Kessler VG 2700 (two stage)……………………….. 80
Road/off-road switchover………………………………………………………….. 81
Transversal differential lock axle 2 and 4…………………………………….. 82
Long. and transv. differential lock axle 3……………………………………… 83
► Steering:……………………………………………………………………………….. 84
Steering from superstructure…………………………………………………….. 84
Steering gear ZF-SERVOCOM…………………………………………………. 85
Oil supply steering circuit 1, deficiency monitoring……………………….. 86
Oil supply steering circuit 2, deficiency monitoring……………………….. 87
► Active rear axle steering………………………………………………………… 88
CAN-Valves (HAWE)……………………………………………………………….. 88
Valve block……………………………………………………………………………… 89
Measuring connections MP6, MP8, MP9…………………………………….. 90
Angle sensor…………………………………………………………………………… 91
Steering- and centering cylinder, safety valves……………………………. 92

► Support…………………………………………………………………………………. 93
Level sensor…………………………………………………………………………… 93
Support valves – right……………………………………………………………….. 94
Support valves – left…………………………………………………………………. 95
Sliding beam – extension cylinder ……………………………………………… 96
Sliding beam – monitoring with rope length sensor……………………….. 97
Support cylinder………………………………………………………………………. 98
Support cylinder – monitoring…………………………………………………….. 99
Variant – support monitoring…………………………………………………….. 100
Variant – Vario Base……………………………………………………………….. 101
► Axle suspension:…………………………………………………………………. 102
Oil supply, control valve blocked/sprung…………………………………… 102
Level sensor- axle suspension………………………………………………… 103
Valve block – axle suspension right…………………………………………… 104
Valve block – axle suspension left…………………………………………….. 105
► Special equipment:………………………………………………………………. 106
Dolly operation – diaphragm reservoir overview…………………………. 106
Dolly operation – switch over diaphragm reservoir………………………. 107
Dolly operation – additional hydraulics………………………………………. 107
Additional heating Thermo Pro 90……………………………………………. 108
Engine preheating – Thermo Top Pro 150 and Airtop Evo 55……….. 109
Additional heating UW Airtop – Air Top 2000STC………………………….110
Hydraulic emergency control…………………………………………………….111
Emergency control crane hydraulic (UW)……………………………………111
External power supply 110 V / 230 V………………………………………….112
Battery charger……………………………………………………………………….113
Back-up camera………………………………………………………………………114
► Index…………………………………………………………………………………….115

► Superstructure general:………………………………………………………..3
Lighting slewing platform…………………………………………………………3
Lighting boom………………………………………………………………………..4
LMB – warning device (EN 13000)…………………………………………….5
Central greasing device…………………………………………………………..6
Slewing gear – boom direction …………………………………………………7
Immobiliser*…………………………………………………………………………..8
► Crane cabin:…………………………………………………………………………9
Control stand – Liccon – monitor, pedals, ethernet……………………….9
Control stand – joystick, LSB-TE1 right…………………………………….10
Control stand – joystick, LSB-TE2 left……………………………………… 11
Control stand – operation- and control unit……………………………….12
Control stand – control elements side console…………………………..13
Platform cab…………………………………………………………………………13
cab installation – interior furnishing………………………………………….14
cab installation – wiper motor, washer pump……………………………..15
Heating – activation, temperature sensors………………………………..16
Heating – heating air conditioning……………………………………………17
Heating – Thermo Pro 90……………………………………………………….18
Switch cabinet crane cabin:………………………………………………..19
Cab cabinet – air circulation……………………………………………………19
Tilting frame – fuses………………………………………………………………20
Relay, resistor modules………………………………………………………….21
Mounting plate – LSB-master, voltage converter………………………..22
UEA module, data logger 2…………………………………………………….23
Remote diagnosis…………………………………………………………………24
EMERGENCY OPERATION resistors…………………………………….24
Diagnosis plug……………………………………………………………………..25
Plug plate slewing platform / cab…………………………………………….26
► Crane hydraulic:…………………………………………………………………27
Hydraulic pumps (chassis)……………………………………………………..27
Overview hydraulic components……………………………………………..28
Overview metering connector plate…………………………………………29
Main control block with hoist gear 2…………………………………………30
Main control block – pressure stage, position monitoring…………….31
Main control block – pressure sensor……………………………………….31
Slewing gear – activation, brake………………………………………………32
Luffing gear………………………………………………………………………….33
Hoist gear 1 – valves and connections……………………………………..34
Hoist gear 2* – winch……………………………………………………………..35
Hoist gear 2* – valves and connections……………………………………36
Auxiliary consumer, locking slewing platform……………………………37
Ballast – swivel arm (ballasting right)……………………………………….38
Ballast – swivel arm (ballasting left)…………………………………………39
Ballast monitoring…………………………………………………………………40
Tele- / gripper pinning, hydraulic oil filter………………………………….41
Oil cooler……………………………………………………………………………..42
Copyright by
liebherr
LWE – Customer Service – Documentation
Author: lweegm0 / Issue: 24.01.2020
LTM 1090-4.2 from 089400 (KD-series 1001) OW-02 • BMK – Component overview 2 of56
* = Customer‘s spec.
Note:
All stated pressures meet the values of December 2018!
Dolly operation* (dolly for boom transport USA)………………………..43
Emergency control crane hydraulic*………………………………………..44
► Telescoping boom:……………………………………………………………..45
Base section………………………………………………………………………..45
Boom head………………………………………………………………………….46
Extension mechanics – Telematic tele pinning…………………………..47
Extension mechanics – Telematic tele gripper position……………….48
► Special equipment:……………………………………………………………..49
Swing-away jib* (single-, double-)…………………………………………..49
Swing away jib* – hydraulically………………………………………………..50
Swing away jib* – slewing cylinder…………………………………………..51
Air-conditioner………………………………………………………………………52
Camera monitoring boom*……………………………………………………..53
Camera monitoring slewing platform*………………………………………53
► Index………………………………………………………………………………….54

Liebherr Crane