The Liebherr LTM 1090-4.1 Mobile Crane earns its keep on tight, time-critical jobs, so knowing exactly where each component sits matters for both uptime and labor cost. The Technical Information & BMK Components Manual (component identification) is what your techs grab when a fault points to “K15” or “V22” and they need to find it on the actual crane. This isn’t about how to fix the fault; it’s about getting the right person to the right part fast. For a fleet, that’s the difference between a planned stop and a wasted half-day of hunting.
What this manual helps you do
- Identify electrical, hydraulic, and mechanical components by Liebherr BMK / reference designators on the LTM 1090-4.1.
- Locate specific items on both carrier and superstructure using layout views and outline diagrams.
- Trace a symbol from wiring or hydraulic schematics to its physical mounting point on the crane.
- Cross-reference component IDs with other Liebherr manuals when you’re chasing a fault code or planning a repair.
- Pinpoint what a device is called in Liebherr’s terminology so you can brief techs and request the right parts or service info.
Who this is for
This suits workshop technicians, field service techs, electrical diagnostic engineers, fleet mechanics, and training instructors who already work with Liebherr documentation. If you need step-by-step repair procedures, torque specs, or part numbers, you want the service manual and parts catalogue instead, not this BMK manual.
FAQ
Q: Are the diagrams clear and searchable in PDF?
A: Yes, these manuals are usually delivered as a readable PDF with clear component outlines suitable for on-screen zooming and searching by ID.
Q: Does it cover both carrier and superstructure for SN 061903?
A: Yes, this BMK manual typically combines carrier and superstructure component identification for that serial reference.
Q: Does it tie into wiring diagrams and parts catalogues?
A: Yes, the BMK is designed to match reference designators used in Liebherr wiring/hydraulic diagrams and to support lookups in parts and service manuals.
Bottom line: If your main need is “Where is this component on my LTM 1090-4.1, and what does Liebherr call it?”, this is the right manual. If you’re after how to repair it or which part number to order, this is not what you need.
📘 Show Index
Table of Contents:
Carrier — Table of Contents
- Chassis_1090-4.1_ab_061794
- Vehicle:
- View from front, lighting and mirrors
- View from rear, lighting
- Support control unit, side marker lights, right
- Support control unit, side marker lights, left
- Cab:
- Interior lighting, doors
- Ventilation and heat exchangers
- Operating elements
- Centre console – main switch, batteries, fuses, transformer
- Centre console – I/O modules and diagnostic connector
- Centre console – instrumentation module, Intarder ECU
- Centre console – relays
- Centre console – fuses
- Pressurized air system:
- Pressure sensors and valves in brake system
- Compressor and dryer
- Auxiliary load valve block
- Four channel ABV drive unit
- Diesel engine D 846 TI A7, 370 kW/503 PS (Common Rail)
- Left side view of engine
- Right side view of engine
- View of engine from flywheel side
- Top view of engine
- Injectors
- Fuel pumps
- Fuel Service Center FSC
- Rail pressure sensor
- Pressure limiting valve in fuel system
- Banjo bolts for limiting pressure in fuel system
- Speed sensor
- Charge air sensor
- Oil pressure sensor
- Water-cooled external exhaust gas return
- flame starting device
- Coolant level and temperature
- Engine control unit, air filter pressure
- Diesel fuel system
- Fuel prefilter and fuel tank
- Automatic shift transmission ZF 12 AS 2302 with Intarder:
- Clutch and transmission actuators
- Intarder
- Hydraulic pumps:
- Pumps, fan drive and cooling system
- Power train:
- Overview
- Transfer gearbox VG 2600 – contact switch and speed sensor
- Transfer gearbox – road/off-road switchover
- Contact switch on axle 1 and 2
- Contact switch on axle 3 and 4
- Wheel rotation sensors
- Retarder Telma Focal F 2200*
- Steering:
- Steering pumps and steering from superstructure
- Steering gear
- Fault monitoring, pressure/ emergency supply
- Active rear axle steering:
- Angle sensor
- I / O modules and resistor modules in the support operating units
- Hydraulic pumps rear axle steering axles 3, 4
- Bosch CAN valves, axles 3 and 4
- Valve block axle 3 and 4
- Support:
- Supporting valves left
- Supporting valves right
- Inclination sensor
- Supporting force display pressure sensor
- Axle suspension:
- Axles suspension feedback
- Filling and draining valves, left
- Filling and draining valves, right
- Special equipment:
- Battery charger
- External power supply 230V
- Navigation equipment*/ Navigation equipment* with reversing camera*
- Auxiliary heating
- Index Chassis
- Symbole
- – Engine oil
- – Fuel
- Fine filter…
- Fuel tank…
- Manual delivery pump…
- Suction filter…
- – Pumps
- Centring circuit…
- Emergency steering pump…
- Steering circuit 1…
- Steering circuit 2…
- A
- A1…
- A5…
- A9…
- A10…
- A11…
- A12…
- A13…
- A14…
- A15…
- A60…
- A61…
- A62…
- A68_B1…
- A68_Y1…
- A68_Y2…
- A69…
- A71…
- A77*…
- A100…
- A103…
- A103_4…
- A103_7…
- A104…
- A112…
- A130…
- A131…
- A145…
- A150_E…
- A150_M1…
- A150_M2…
- A151_E…
- A151_M1…
- A151_M2…
- A700…
- A700_X1…
- A700_X2…
- AF0…
- AF1…
- AF2…
- AF3…
- AF4…
- AF5…
- AF6…
- AF7…
- AF8…
- AF9…
- AF24…
- AF24_F1…
- AF24_F2…
- B
- B5…
- B6…
- B7…
- B8…
- B9…
- B11*…
- B12*…
- B13*…
- B14*…
- B28…
- B29…
- B30…
- B31…
- B39…
- B50…
- B51…
- B52…
- B70…
- B100…
- B141…
- B142…
- B143…
- B144…
- B701…
- B702…
- B703…
- B704…
- B707…
- B708…
- B711…
- B713…
- E
- E1…
- E2…
- E3…
- E4…
- E5…
- E6…
- E11…
- E12…
- E20…
- E21…
- E22…
- E25…
- E26…
- E27…
- E28…
- E40…
- E41…
- E50…
- E51…
- E60…
- E61…
- E62…
- E63…
- E64…
- E75…
- E80…
- E81…
- E82…
- E83…
- E84…
- E95…
- Engine oil
- E100…
- E101…
- E102…
- E103…
- E128_E1…
- E128_E2…
- E128_E3…
- E128_E4…
- E128_E5/E6…
- E128_E7…
- E128_E8…
- E129_E1…
- E129_E2…
- E129_E3…
- E129_E4…
- E129_E5/E6…
- E129_E7…
- E129_E8…
- E200…
- E204…
- E230…
- E231…
- E232…
- F
- G
- H
- K
- K40…
- K41*…
- K49…
- K56…
- K76*…
- K77*…
- K78*…
- K79*…
- L
- M
- M2…
- M9…
- M10…
- M11…
- M12…
- M19…
- M20…
- M21…
- M700…
- MP 1…
- MP 2…
- MP 5…
- MP 7…
- MP 8…
- MP11…
- MP16…
- MP19/20…
- N
- P
- R
- S
- S1…
- S4…
- S5…
- S12…
- S13…
- S14…
- S15…
- S16…
- S17…
- S18…
- S19…
- S22…
- S23…
- S30…
- S31…
- S33…
- S41…
- S42…
- S43…
- S44…
- S50…
- S51…
- S60…
- S61…
- S62…
- S63…
- S64…
- S65…
- S89…
- S90…
- S114…
- S116…
- S118…
- S119…
- S159*…
- S191…
- U
- X
- X29…
- X44…
- X45…
- X56…
- X64…
- X65…
- X90…
- X91…
- X92…
- X93…
- Y
- Y5…
- Y9a…
- Y9b…
- Y10…
- Y11…
- Y12…
- Y13…
- Y16…
- Y17…
- Y18…
- Y19…
- Y20…
- Y24…
- Y25…
- Y40…
- Y41…
- Y41 to Y44…
- Y42…
- Y43…
- Y44…
- Y49…
- Y50…
- Y51*…
- Y52…
- Y53…
- Y64…
- Y65…
- Y66…
- Y80a…
- Y80b…
- Y81a…
- Y81b…
- Y82a…
- Y82b…
- Y83a…
- Y83b…
- Y84a…
- Y84b…
- Y85a…
- Y85b…
- Y86a…
- Y86b…
- Y87a…
- Y87b…
- Y102a…
- Y102b…
- Y107…
- Y108…
- Y109…
- Y220…
- Y221…
- Y222…
- Y225…
- Y226…
- Y231…
- Y232…
- Y702…
- Y703…
- Y711…
- Y712…
- Y713…
- Y714…
- Y715…
- Y716…
Superstructure — Table of Contents
- Superstructure_1090-4.1_ab_061794
- Cab instruments:
- Liccon monitor, pedals
- Left master switch
- Right master switch
- Roof console
- Crane cab:
- Wiper system, radio system
- Heating, auxiliary heater
- Auxiliary heating
- Switch box:
- Slewing frame – fuses
- Slewing frame – relays
- CAN and LSB subscribers
- EMERGENCY OPERATION without LICCON system – X emerg. connector
- EMERGENCY OPERATION without LICCON system – Operation
- EMERGENCY OPERATION without LICCON system – Resistors
- Terminals, voltage converters
- Electric slewing platform:
- Diesel engine D 934 S TI A6, 145 kW/197 PS (PLD)
- Right side view of engine
- Plug-in pumps
- Fuel temperature sensor
- Fuel preliminary filter unit
- Left side view of engine
- Coolant temperature
- Top view of engine
- Frontal view of engine
- Speed sensor
- Oil pressure sensor
- Right installation view
- Radiator fan drive, air filter pressure
- Engine control unit LH ECU UP/CR
- Charge air and coolant temperature sensor
- Charge air pressure sensor
- Ventilation flap in intake air (optional)
- Cooling water level sensor
- Fuel tank and tank sensor
- Pressurized air system:
- Air dryer, cab platform
- Turntable locking mechanism, boom direction
- Hydraulic turntable:
- Hydraulic pump overview
- Hydraulic component overview
- Measuring connection plate overview
- Main control block with one hoist gear
- Main control block with hoist gear 2
- Main control block-pressure staging valves and pressure sensor
- Temperature sensor hydraulic oil
- Winch 1 and 2 – incremental sensor
- Winch 1 and 2 – brake actuation
- Auxiliary load
- Slewing gear – actuation, slewing angle indicator
- Slewing gear – brake
- Luffing gear
- Ballasting
- Turntable, general:
- Lighting turntable
- Central lubrication system
- Telescopic boom:
- Cable drums, angle and length sensors
- Boom head
- Tele pinning
- Tong pinning
- Hydraulic folding jib:
- Actuation
- Right angle sensor and limit switch 59
- Hydraulic components
- Special equipment:
- Dolly (trailer for boom transport, USA)
- Air conditioning system
- Index Superstructure
- Symbole
- – Engine oil
- Dipstick..
- Filter..
- Pump..
- – Fuel
- Delivery pump..
- Fine filter..
- Manual pump..
- Preliminary filter unit..
- – Pumps
- Pump 1..
- Pump 2..
- Pump 3..
- Pump 4..
- A
- A1..
- A2..
- A14..
- A15..
- A50..
- A417..
- A750..
- A750_X1..
- A750_X2..
- AF1..
- AF2..
- AF3..
- AF4..
- AF5..
- AF6..
- AF7..
- AF8..
- AF9..
- AF11..
- AF25..
- B
- B1..
- B2..
- B4..
- B6..
- B7..
- B17*..
- B19..
- B25..
- B26..
- B27..
- B28..
- B29..
- B30..
- B37..
- B38..
- B55..
- B62..
- B701..
- B703..
- B707..
- B708..
- B709..
- B710..
- B711..
- B712..
- B713..
- E
- E6..
- E7..
- E8*..
- E11..
- E12..
- E17..
- E18..
- E60..
- E96..
- Engine oil
- dipstick..
- filter..
- pump..
- E700X272..
- EP0..
- EP1..
- EP2..
- F
- F61..
- F62..
- F63..
- Fuel
- delivery pump..
- fine filter..
- preliminary filter unit..
- G
- H
- H21..
- H80..
- H95..
- H101..
- H102..
- H105..
- H106..
- H423..
- H616..
- H619..
- H633..
- H634..
- H660..
- K
- K1..
- K2..
- K11..
- K12..
- K13..
- K14..
- K15..
- K16..
- K17..
- K18..
- K19..
- K20..
- K21..
- K22..
- K23..
- K24..
- K25..
- K26..
- K27..
- K28..
- K29..
- K30..
- K31..
- K32..
- K33..
- K34..
- K35..
- K36..
- K37..
- K38..
- K39..
- K40..
- K41..
- K42..
- K51..
- K52..
- K53..
- K54..
- K55..
- K56..
- K57..
- K58..
- K59..
- K61..
- K62..
- K651..
- K652..
- M
- M2..
- M3..
- M4..
- M6..
- M7..
- M9..
- M13..
- M23..
- Manual
- M750..
- MP 1..
- MP 2..
- MP 3..
- MP 4..
- MP 5..
- MP 6..
- MP 7..
- MP 8..
- MP 9..
- MP 10..
- N
- P
- P2..
- P3..
- P12..
- P655..
- P656..
- R
- R4..
- R9..
- R50..
- R51..
- R52..
- R53..
- R59..
- S
- S1..
- S26..
- S27..
- S28..
- S29..
- S30..
- S32..
- S34..
- S35..
- S49..
- S50..
- S69..
- S72..
- S73..
- S77..
- S78..
- S81..
- S83..
- S84*..
- S89..
- S90..
- S103..
- S104..
- S301..
- S320..
- S321..
- S322..
- S323..
- S324..
- S325..
- S326..
- S327..
- S328..
- S401..
- S413..
- S420..
- S421..
- S424..
- S425..
- S427..
- S428..
- S602..
- S604..
- S606..
- S608..
- S610..
- S612..
- S614..
- S618..
- S624..
- S626..
- S628..
- S632..
- S636..
- S638..
- S640..
- S642..
- S644..
- S646..
- S648..
- S650..
- S652..
- S654..
- S901..
- S902..
- S903..
- S904..
- S905..
- S908..
- S912..
- S913..
- S914..
- S915..
- S918..
- S919..
- S930..
- S931..
- S940..
- T
- X
- X1..
- X2..
- X3..
- X4..
- X5..
- X6..
- X7..
- X8..
- X9..
- X10..
- X11..
- X12..
- X13..
- X14..
- X15..
- X16..
- X17..
- X18..
- X19..
- X20..
- X21..
- X22..
- X23..
- X24..
- X25..
- X26..
- X27..
- X28..
- X29..
- X30..
- X31..
- X32..
- X33..
- X34..
- X35..
- X36..
- X37..
- X38..
- X39..
- X40..
- X49..
- X50..
- X51..
- X52..
- X53..
- X54..
- X55..
- X56..
- X57..
- X107..
- X108..
- X205S31..
- X268..
- X269..
- X298..
- X417..
- X501..
- X519..
- X5B11..
- X5B12..
- XMLSB2..
- XNOT..
- Y
- Y1a..
- Y1b..
- Y3..
- Y4a..
- Y4b..
- Y5..
- Y6a..
- Y6b..
- Y10..
- Y11..
- Y12..
- Y17a..
- Y17b..
- Y18..
- Y19a..
- Y19b..
- Y20..
- Y21..
- Y22..
- Y23..
- Y27..
- Y28..
- Y31..
- Y32..
- Y38..
- Y40..
- Y49..
- Y56..
- Y58..
- Y66..
- Y67..
- Y69..
- Y80a..
- Y80b..
- Y82..
- Y85a..
- Y85b..
- Y103a..
- Y103b..
- Y109..
- Y137..
- Y139..
- Y141..
- Y142..
- Y711..
- Y712..
- Y713..
- Y714..
Liebherr Crane
