PDF Operation and Maintenance Manual Liebherr R 974 B Litronic - 3 MB
Properly operate and maintain your Liebherr R 974 B Litronic excavator with this detailed manual.
It contains crucial information on daily operating procedures, safety guidelines, and scheduled maintenance tasks.
Following the manufacturer's recommendations is key to preventing premature wear and ensuring the long-term reliability of your machine.
This guide is an invaluable tool for both operators and service personnel.
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--- Page 1 ---
Operation and
Maintenance Manual
Litronic
--- Page 3 ---
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Check the electrical system regularly. frequencies, multi shift or around the clock
Make sure that any problems, such as loose operations).
connections, burnt out fuses and bulbs, scorched Hoses and lines must be replaced if any of the
or chafed cables are fixed immediately by an following points are found during an inspection (see
electrician or qualified personnel. guidelines ISO 8331):
Use only Original fuses with the specified Damage on the external layer into the inner
amperage. Never use a different size or stronger layer (such as chaffing, cuts and rips);
fuse than the original fuse. Brittleness of the outer layer (crack formation of
the hose material);
On machines with electrical medium or high Changes in shape, which differ from the natural
voltage systems: shape of the hose or line, when under pressure
If there is any problem with the electrical or when not under pressure, or in bends or
energy supply, turn the machine off curves, such as separation of layers, blister or
immediately. bubble formation, crushing or pliers.
Follow established lockout / tag out Leaks;
procedures where applicable. Non observance of installation requirements;
Any work on the electrical system may only Damage or deformation of hose fittings, which
be performed by a qualified electrician or might reduce the strength of the fitting or the
qualified personnel under the guidance and connection between hose and fitting;
supervision of an electrician, according to Any movement of hose away from the fitting;
electro - technical regulations. Corrosion on fittings, which might reduce the
If any work is required on any parts which function or the strength of the fitting;
carry current, use a second person to turn off the When replacing hoses or lines, always use Original
main battery switch, if necessary. Rope the work replacement parts.
area off with a safety rope or chain, and set up Route or install the hoses and lines properly.
warning signs. Use only insulated tools. Do not mix up the connections!
When working on medium and high voltage Always take care to avoid torsional strain when
components, shut off the voltage and connect the installing a new hose. On high pressure hydraulic
supply cable to the ground and ground the hoses, the mounting screws must be first mounted
components, such as the condenser, with a on both hose ends (full flange or half clamp) and
grounding rod. tightened only thereafter.
Check all disconnected parts if they are truly On high pressure hoses having one curved end,
free of current, ground them and close them off always tighten first the screws on the curved hose
quickly. Insulate any close-by, current carrying end and only then the screws on the straight hose
parts. end.
Install and tighten the hose clips that may be
HYDRAULIC LINES AND HOSES mounted on the hose middle only when the both
Hydraulic lines and hoses may never be hose ends are already tightened.
repaired! Always install hoses so to avoid any friction
All hoses, lines and fittings must be checked with other hoses and parts.
daily, but at least every 2 weeks for leaks and any We recommend to keep a distance between hose
externally visible damage! Never check for leaks and other parts of at least one half of the hose outer
with your bare hands, use a sheet of paper or diameter. Keep a minimum gap of 1/2 inch in any
something else. Any damaged sections must be case.
replaced immediately! Escaping oil can cause After mounting a hose connecting two parts that are
injuries and fires! movable to each other, check during the return to
Even if hoses and lines are stored and used service that the hose is not rubbing in the whole
properly, they undergo a natural aging process. moving range.
For that reason, their service life is limited. Check daily that all flanges and covers are fixed
Improper storage, mechanical damage and correctly. It will prevent vibrations and damage
improper use are the most frequent causes of hose during operation.
failures. Concerning the hoses, you must follow the
safety regulations applicable to your work
environment and job site and any federal, state
and local safety requirements.
Using hoses and lines close to the limit
ranges of permitted use can shorten the service life
(for example at high temperatures, frequent
working cycles, extremely high impulse
2.10
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Error codes for electrical errors of the electronic control system
Errorr- Related.
code EDC Defective component Default recognized
Errorr
E 001 3011 Transmitter for engine oil pressure Short to ground or Broken wire
E 003 3021 Short circuit + 24 V
E 004 Transmitter for engine coolant level Short to ground
E 005 Short circuit + 24 V
E 006 Broken wire
E 009 3018 Transmitter for engine coolant temperature Short to ground
3018 Broken wire
3028 Short circuit + 24 V
E 010 Transmitter for hydraulic oil level Short to ground
E 011 Short circuit + 24 V
E 012 Broken wire
E 013 Transmitter for hydraulic oil temperature Short to ground
E 014 Short circuit + 24 V
E 015 Broken wire
E 016 Switch for pumps splitterbox oil temperature Short to ground
E 017 Short circuit + 24 V
E 018 Broken wire
E 022 Signal for engine RPM between engine regulator Short to ground
E 023 and printing plate A1010 Short circuit + 24 V
E 024 Broken wire
E 027 Regulation solenoid valve -pump power control(LR) Connection wire defective
E 033 3009
E 036 Regulation solenoid valve Oil flow Pump P1 (EV1) Connection wire defective
E 039 Regulation solenoid valve Oil flow Pump P 2 (EV2) Connection wire defective
E 042
E 045
E 063 3019 Transmitter for boost air temperature Short to ground or Broken wire
E 065 3029 Short circuit + 24 V
E 071 3012 Transmitter for boost air pressure Short to ground or Broken wire
E 073 3022 Short circuit + 24 V
E 074 3008 Starter of Diesel engine Starting time too long
E 075 Starter defective
E 076 3059 Actuator of injection pump Default in fuel pump actuator
compensation
E 077 3058 Actuator of injection pump End
E 078 Regulator for Diesel engine Hardware default
E 079 Regulator for Diesel engine Software default
E 080 3053 Actuator of injection pump Difference between actual and desired
values of regulation stroke
E 081 3001 RPM transmitters for Diesel engine RPM transmitter B12- 1 defective
E 082 3002 RPM transmitter B12- 2 defective
E 083 3050 Actuator of injection pump Error in feedback of injection pump
3056 actuator
E 084 3006 Preglow system of Diesel engine Preglow voltage too low
E 085 3006 Preglow system of Diesel engine Preglow current too low
E 086 3007 Fuel solenoid valve Connection wire or solenoid valve defec.
E 087 3003 RPM transmitters for Diesel engine Measured RPM difference B12-1/B12-2
3.14
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OPERATION OF THE EXCAVATOR IN SAFETY MODE
The printed board E52 containing all necessary switches and lights
for the safety operation of the excavator is situated at the rear end
of the right side control desk. Thanks to this printed board, the
excavator can, in case of a trouble in the main electronic circuit, be
maintained operating temporarily and with some restrictions.
Switch S71 for engine start in safety mode
In normal operation, the engine is started via the main electronic
circuit when the ignition key is turned to start position.
In case the engine can no longer be started or kept running due to
troubles in the main control circuit of the excavator, it can be started
in safety operation via the safety mode start switch S71.
To start, turn the ignition key to start position, with the switch S71
101 tilted to the right, until the engine is started.
The engine can also be switched into safety operation
automatically, as an exemple consecutively to a communication
default in the control system.
In safety operation, the control light H11 is lighting up at the safety
control board E52 and at the same time the warning symbol S71a
appears on the monitoring display.
In safety operation the stop of the Diesel engine is achieved just like
in normal operation, while turning back the ignition key to the "off"
position.
In safety operation, the communication between the electronic
control box of the engine and the main circuit of the excavator may
be no longer established.
H11 Warning light / Diesel engine in safety mode
In case of the occurence of any operating error on the Diesel
H60 Warning light / operating error on Diesel
engine, the red warning light H60 lights up on the safety control
engine with safety mode turned on
board E52, at the same time a buzzer will sound inside the cab and
E52 Printed board for safety operation the error code E525 is displayed on the screen.
S71 Switch / engine start in safety mode
S72 Switch / RPM selection in safety mode
In safety operation the followings remain guaranteed:
S71 Switch / servo pressure circuit in safety mode - the automatic engine power reduction in case of overheating of
the engine coolant or of the charge air.
- the memorization of the occuring engine faults into the inner
error memory of the control box of the engine.
At the opposite, the shutdown of the engine in case of low engine oil
pressure and of overheating of the engine coolant or of the charge
air is no longer ensured.
CAUTION
In case the warning light H60 lights up, the operator must
shut the engine down as soon as possible and recognized
which error has occured.
It's the operator's own responsibility to decide if the
machine can be maintained operating or not.
3. 24
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THE HEATER AND AIR CONDITIONER
As standard equipment the driver's cab is fitted with a heater and air conditioner unit (fig.76) which can be
used for heating, cooling off and also as a fresh air ventilation for the cab.
The main functions of the control unit for this heater and air conditioner are described thereafter. For a more
detailed description, refer to the pages 3.37 and followings at the end of this chapter.
THE CONTROL UNIT
Control Touches LCD Indication
1 - Touch - Air conditioner On / Off 13 - Symbol indicates recirculated air operation
2 - Touch - Increasing the set value for cab temperature, fan 14 - Symbol indicates REHEAT- operation
RPM, ... 15 - Symbol indicates air conditioner on
3 - Touch - Reducing the set value for cab temperature, fan 16 - Symbol indicates ventilation flap to cab rear side OPEN
RPM, ...
17 - Symbol indicates ventilation flap to control board OPEN
4 - Touch-Control unit heater and air conditioner On / Off
18 - Symbol indicates lower ventilation flap in MIDDLE
5 - Commutation Touch - manual / automatic control for position
evaporator fan RPM
19 - Symbol indicates lower ventilation flap OPEN
6 - Touch - REHEAT operation On / Off
20 - Symbol indicates full automatic operation is ON
7 - Commutation - Heater control manual / automatic
21 - Bar graph shows fan RPM (if manually adjusted)
8 - Touch - Fresh air admission On / Off
22 - Symbol indicates manual fan control is ON
9 - Touch - ventilation flap to cab rear side OPEN /CLOSED
23 - Symbol indicates manual heating power control is ON
10 - Touch - ventilat. flap to control board OPEN / CLOSED
24 - Bar graph shows heating power (if manually adjusted)
11 - Commutation Touch - Lower ventilation flap in MIDDLE
position / CLOSED 25 - Indicates set value for temperature or error code
12 - Commutation Touch - Lower ventilation flap OPEN / in 26 - Indicates the employed temperature unit - (°) or (F)
MIDDLE position
TURNING THE CONTROL UNIT ON ADJUSTMENT OF DESIRED CAB
TEMPERATURE
The heater and air conditioner is turned on via
the touch (4). After turning on, the control unit will The 4 positions indication range (25) shows the
perform an auto-check for approx. 12 second. set value for cab temperature.
Heater and fresh air ventilation of the cab are Use the touches (2) and (3) to increase or reduce
now operative. The control unit controls in this value.
automatic the heating power and the RPM of the
fan inside the heater and air conditioner.
RECIRCULATED AIR AND FRESH AIR
However heating power, respec. fan RPM can
OPERATION
also be adjusted manually while actuating the
touch (7) respec. (5) and adjusting immediately The heater and air conditioner can be operated
after the heating power respec. the fan RPM via with 100% recirculated air, but also with a mixing
the touches (2) and (3) of fresh air (F) and recirculated air (R).
3.34
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Observe all product safety guidelines when handling Always support the raised machine in such a way
oils, grease, and other chemical substances. that any shifting to the weight change will not
influence the stability. Do not support the machine
Make sure service fluids and replacement parts are with metal on metal support.
disposed of properly and in an environ-mentally
sound manner. Only qualified, especially trained personnel may
work on travel gear, brake and steering systems.
When using hot service fluids, be very careful. (They
can cause severe burns and injury!). If it becomes necessary that the machine must be
repaired on a grade, block the chains with wedges
Operate combustion motors and fuel operated and secure the uppercarriage to the undercarriage
heaters only in well ventilated areas. Before with the lock pin.
operating these units, check ventilation.
In addition, always follow applicable local Only qualified, especially trained personnel may
regulations. work on the hydraulic system.
Never try to lift heavy parts. Use appropriate lifting Never check for leaks with your bare hands,
devices with sufficient load carrying capacity. When always wear gloves. Fluid escaping from a small
replacing or repairing parts or components, make hole can have enough force to penetrate the skin.
sure they are mounted very carefully on lifting
devices, to prevent any possible danger. Use only Never loosen or remove lines or fittings before the
suitable and technically sound lifting devices, make attachment has been lowered to the ground and
sure that lifting tackle, wire cables, etc. has the engine has been turned off. Then turn the
adequate load carrying capacity. ignition key to contact position with tilted down
Never position yourself, walk or work underneath safety lever, move all servo controls (joysticks and
suspended loads. foot pedals) in both direction to release pressures.
Then release the tank pressure as outlined in this
Never use damaged lifting devices, or devices which Operation and Maintenance Manual.
are not sufficient to carry the load.
Always wear gloves when handling wire cables. Always disconnect the battery cable before
working on the electrical system or before any arc
Ask only experienced personnel to attach loads and welding on the machine. Always disconnect the
guide and signal the crane operator. The guide must negative (-) cable first and reconnect it last.
be within the visibility range of the operator and / or
must be in direct voice contact with the operator. Check the electrical system regularly.
Make sure that any problems, such as loose
When working overhead, use appropriate and safe connections, burnt out fuses and bulbs, scorched
ladders, scaffolding or other working platforms or chafed cables are fixed immediately by an
designated for that purpose. electrician or qualified personnel.
Never step on parts or components on the machine
when maintaining or repairing items overhead. Use only Original fuses with the specified
When working high above ground, make sure you amperage. Never use a different size or stronger
are fitted with ropes and appropriate safety devices fuse than the original fuse.
which will prevent a possible fall. On machines with electrical medium or high
Always keep handles, steps, railings, platforms and voltage systems:
ladders free of dirt, snow and ice! - If there is any problem with the electrical energy
When working on the attachments, for example supply, turn the machine off immediately.
when replacing the bucket teeth, makes sure the - Follow established lockout / tag out procedures
attachment is supported properly. Never use metal where applicable.
on metal support! - Any work on the electrical system may only be
performed by a qualified electrician or qualified
For safety reasons, never open and remove a track personnel under the guidance and supervision of
chain unless having previously totally released the an electrician, according to electro - technical
pretension of the chain tensioning unit. regulations.
Never work underneath the machine if it is raised or
propped up with the attachment. The undercarriage
must be supported with wooden blocks and
supports.
6.2