Maeda LC785M-6B User manual

556BE-OM0806-00
OPERATION MANUAL
CRAWLER CRANE
BLADE
Serial No. 31460 and up
Unsafe use of this machine may cause serious injury or death. Operators
must read this manual before operating this machine. This manual should
be kept near the machine for reference and periodically reviewed by all
personnel who will come into contact with it.
NOTICE
MAEDA has Operation Manual written in some other languages. If a foreign
language manual is necessary, contact your local distributor for availability.

1-1
BLADE
1. PRECAUTION OF BLADE OPERATION 1-2
2. SAFETY LABEL LOCATION 1-4
2.1 SAFETY LABEL LOCATIONS IN THE MACHINE EXTERIOR 1-4
2.2 SAFETY LABEL LOCATIONS INSIDE THE CABIN 1-5
3. MACHINE EACH SECTION 1-7
3.1 MACHINE OVERALL VIEW 1-7
3.2 CONTROLLING DEVICE OVERALL WIEW 1-8
4. DESCRIPTION OF EACH DEVICE 1-9
5. OPERATIONS 1-10
5.1 OPERATION OF BLADE 1-10
5.2 WORKS WITH A BLADE 1-10
5.3 PARKING THE MACHINE 1-11
6. TRANSPORTATION 1-12
6.1 HOW TO HOIST THE MACHINE 1-12
7. INSPECTION AND MAINTENANCE 1-16
7.1 MAINTENANCE EVERY 50 HOURS 1-16
8. SPECIFICATIONS 1-17
8.1 SPECIFICATIONS 1-17
8.2 DIMENSIONS 1-18

1-2
1. PRECAUTION OF BLADE OPERATION
[BASIC POSTURE OF THE BLADE MODEL]
• Always clear the Blade from the ground during the hoisting operation. Failure to do so may
result a serious hazard including damaging the machine or its tipping over.
• Avoid ground leveling operations at the same time as hoisting operations. Otherwise, it may
cause a serious hazard including damaging the machine or its tipping over.
• A basic posture as below shall be observed for ground
leveling operations using the Blade.
• Keep the Blade ahead.
• Retract the boom to the minimum and stow the hook.
• Lower the boom to the range between “full lowered to
35 degrees”.
Where the boom is raised in excess, the machine may tip
over to result a serious hazard.
• Any leveling operations other than in the basic posture may cause a machine tipping or
damage to the wire rope which triggers a serious accident.
[SAFETY PRECAUTIONS FOR GROUND LEVELING]
• In the condition that the boom is “full lowered”, its end
exceeds the Blade end by “173cm”. It is essential to
ensure that no obstacles lie ahead. Else, the boom may
hit an obstacle and bring a critical accident.
• After leveling operations finish or during transportation,
position the Blade to touch the ground. The Blade may
unforeseeably fall down to cause critical accident due to
a spontaneous Blade cylinder slack or hydraulic system
error.
• Do not attempt to travel backward while the Blade
touches the ground, which can damage the hydraulic
hose. The Blade may be led into inoperability.
• Avoid the Blade to hit obstacles such as stones and
rocks.
Immediate damage of the Blade or cylinder may follow
such an event. 



1-3
CAUTION
• The machine weight depends on the machine configuration.
Refer to the Table below for the machine weight and the loads per 2 part hanging and 4 part
hanging of the machine body.











































Model names of the table above represent the
respective machine configurations:
• LC785M-6F stands for a Fly-Jib model.
• LC785M-6B stands for a Blade model.
• LC785M-6BF stands for a Blade and Fly-Jib model.
• For all other safety precautions not covered in this section, refer to the section: “SAFETY” of
the LC785M-6 operation manual.

1-4
2. SAFETY LABEL LOCATION
CAUTION
In this section, the safety labels indicated are exclusive for a Blade model but different from
those of a standard model. For labels other than these, refer to the section: “SAFETY – SAFETY
LABEL LOCATION” of the LC785M-6 operation manual.
Keep these safety labels clean and legible at all times.
When a safety label is degraded, missing or illegible, replace with a new label.
In addition to the safety labels shown below, some other labels are required to post. Control them in the
same manner.
2.1 SAFETY LABEL LOCATIONS IN THE MACHINE EXTERIOR

1-5
2.2 SAFETY LABEL LOCATIONS INSIDE THE CABIN

1-6
(1) Machine weight (556-4575400) (2) Loads on 4-rope machine hoisting
(556-4575500) (4 places)
(3) Loads on 2-rope machine hoisting
(556-4575600) (2 places)
(4) Caution when blade operating (556-4575300)

1-7
3. MACHINE EACH SECTION
3.1 MACHINE OVERALL VIEW
(1) Top boom
(2) Fourth boom
(3) Third boom
(4) Second boom
(5) First boom
(6) Working light
(7) Sprocket
(8) Track shoe
(9) Track frame
(10) Idler
(11) Boom derricking cylinder
(12) Headlight
(13) Hook
(14) Overwinding detector
(15) Rotary lamp
(16) Blade cylinder
(17) Blade

1-8
3.2 CONTROLLING DEVICE OVERALL WIEW
(1) Car radio
(2) Air conditioner control panel
(3) Safety lock lever
(4) Left side control lever
(5) One-touch deceleration switch
(6) Traveling pedals
(7) Traveling levers
(8) Acceleration pedal
(9) Switch box
(10) Moment limiter device
(11) Ashtray
(12) Level
(13) Machine monitor
(14) Horn switch
(15) Right side control lever
(16) Cigarette lighter
(17) Blade control lever
(18) Starter switch
(19) Fuel adjustment dial
(20) Lamp switch
(21) Warning buzzer stop switch
(22) Swing brake release switch
(23) Winch two-speed switch
(24) Hook stowage switch
(25) Moment limiter emergency release switch
(26) Traveling speed selector switch
(27) Operation mode selector switch
(28) Battery charge monitor
(29) Engine oil pressure monitor
(30) Engine water temperature gauge
(31) Engine water temperature monitor
(32) Display (For failures)
(33) Fuel level monitor
(34) Fuel gauge
(35) Service meter
(36) Warm-up monitor
(37) One-touch deceleration monitor
(38) Wiper switch
(39) Window washer switch
(40) EMO switch

1-9
4. DESCRIPTION OF EACH DEVICE


CAUTION
In this section, the devices indicated are exclusive for a Blade model but different from those of
a standard model. For devices other than those, refer to the section: “HANDLING –
DESCRIPTION OF EACH DEVICE” of the LC785M-6 operation manual.
[1] BLADE CONTROL LEVER
Use this lever to operate the blade.
Lower: Push the lever to forward.
Neutral: The Blade stops tilting and is held in the position.
Raise: Draw the lever backward.

1-10
5. OPERATIONS
CAUTION
In this section, the devices indicated are exclusive for a Blade model but different from those of
a standard model. For devices other than those, refer to the section: “HANDLING –
OPERATIONS” of the LC785M-6 operation manual.
5.1 OPERATION OF BLADE
• Always clear the Blade from the ground during the hoisting operation. Failure to do so may
result a serious hazard including damaging the machine or its tipping over.
• Avoid ground leveling operations at the same time as hoisting operations. Otherwise, it may
cause a serious hazard including damaging the machine or its tipping over.


Shift back and forth the Blade control lever in the right side of the
operator’s seat to actuate the Blade.
CAUTION
• Indications and warning are issued against a load hoisting
operation in a condition where the Blade is lowered and a
certain load is imposed. At the same time, crane functions
below are interrupted:
Indications and warnings:
• Rated total load display in the Moment limiter will blink
and indicate “bld”.
• Buzzer sounds intermittently.
• A red lamp of the rotary lamplights.
Functions to be interrupted:
• Winch hoisting
• Boom derricking
• Boom extending
While a certain load is imposed to the Blade in addition to
that a load is hoisted, the above conditions continue.
Either to clear the Blade from the ground or to fall the
hoisted load on the ground will release these indications
and warnings, then the crane resumes these functions.
• During traveling not for ground leveling operations, keep
the Blade clear from the ground. Road surface may be
damaged in such a condition.
5.2 WORKS WITH A BLADE
[1] GROUND LEVELING
Secure the safety of surroundings, first.
Accident to third persons, machine tipping over due to
off-track, or the Main boom crashing may happen, to result
a serious hazard, including injury or death.
The Blade is employed to ground leveling operations.

1-11
5.3 PARKING THE MACHINE
• Park the machine on a level and solid ground but avoid a
slope. If you have no choice but to park on a slope, apply
a block to prevent the machine to come-down; and direct
the Blade downward and make it bite the ground, as
shown on the figure on the right.
• To touch operation levers carelessly may cause a sudden
motion of the crane or machine body which incurs a
serious hazard. Always shift the safety lock lever to the
lock position securely before you leave the operator’s
seat.
1. Release your foot from the acceleration pedal (5).
2. Return the left and right traveling levers (3) to N (neutral)
position.
3. Shift the Blade control lever (7) to “lower” direction so that the
Blade touches the ground.
4. Turn the fuel adjustment dial (6) to “low idling” position and
decrease the engine speed.
5. Turn the starter switch key to the “OFF” position and stop the
engine, then pull out the starter switch key.
6. Lock the control levers securely with the safety lock lever (4) to
the lock position.

1-12
6. TRANSPORTATION
CAUTION
In this section, the devices indicated are exclusive for a Blade model but different from those of
a standard model. For devices other than those, refer to the section: “HANDLING –
OPERATIONS” of the LC785M-6 operation manual.
6.1 HOW TO HOIST THE MACHINE
6.1.1 HOW TO THE MACHINE WITH THE BOOM LOWERED
NOTES
• Use four hoisting wire ropes of the same standard.
• Breaking force: 18.7 ton or more
• φ18 x 2.0 m or more
• Use four shackles of the same standard.
• Working load: 3.0 ton or more



CAUTION
When the machine is hoisted with the hook stored at the
end of the hook, the boom will raise due to the machine
weight, preventing the machine from being hoisted.
When hoisting the machine with the boom lowered, always
secure the hook and boom to the machine body using the
hooking wire rope.
1. Slew the crane superstructure so that the boom end comes to
the Blade side and the superstructure and track frame are
parallel.
2. Hang the hook over the hooking wire rope and move the boom
to take the posture shown in the figure on the right. Secure the
hook and boom to the machine body.
3. Shift the Blade control lever to “lower” direction so that the
Blade touches the ground.
4. Turn the fuel adjustment dial to “low idling” position and
decrease the engine speed.
5. Turn the starter switch key to the “OFF” position and stop the
engine, then pull out the starter switch key.

1-13
6. Lock the control levers securely with the safety lock lever (4) to
the lock position.
7. Install shackles at two locations (A) on the crane boom and two
locations (B) on the crane frame, to hook the hoisting wire rope
in a manner such that the hoisting angle is “60 degrees or less”.
NOTES
The hoisting hook should come to the center of the gravity at this
point.
8. Verify that there is no posture change caused by the leakage
from the hydraulic circuit on the derricking cylinder head side
when the machine is hoisted.
9. After the machine left the ground, verify the hook condition and
hoisting posture. Then slowly hoist the machine.
NOTES
When the crane is hoisted in the above posture, it inclines about
“1 degree” backward.

1-14
6.1.2 HOW TO HOIST THE MACHINE WITH THE BOOM RAISED
NOTES
• Use two hoisting wire ropes of the same standard.
• Breaking force: 36 ton or more
• φ25 x 8.6 m or more
• Use two shackles of the same standard.
• Working load: 7.0 ton or more
1. Retract all the booms and raise the boom to 80 degrees. Stow
the hook block to the boom top end.
2. Slew the crane superstructure so that the boom end comes to
opposite the Blade side and the superstructure and track frame
are parallel.
3. Shift the Blade control lever (7) to “lower” direction so that the
Blade touches the ground.
4. Turn the fuel adjustment dial to “low idling” position and
decrease the engine speed.
5. Turn the starter switch key to the “OFF” position and stop the
engine, then pull out the starter switch key.
6. Lock the control levers securely with the safety lock lever (4) to
the lock position.

1-15
7. Install shackles at two locations on the crane frame to hook the
hoisting wire rope.
NOTES
Before hoisting the machine, place some cushion where the
hoisting wire rope and the machine come into contact.
8. Verify that there is no posture change caused by the leakage
from the hydraulic circuit on the derricking cylinder head side
when the machine is hoisted.
9. After the machine left the ground, verify the hook condition and
hoisting posture. Then slowly hoist the machine.
NOTES
When the crane is hoisted in the above posture, it inclines about
“6 degree” forward.

1-16
7. INSPECTION AND MAINTENANCE
CAUTION
In this section, the devices indicated are exclusive for a Blade model but different from those of
a standard model. For devices other than those, refer to the section: “INSPECTION AND
MAINTENANCE” of the LC785M-6 operation manual.
7.1 MAINTENANCE EVERY 50 HOURS
[1] GREASING
CAUTION
• Grease every 10 hours until a new machine operated for 100 hours, that is the time when the
machine gets used to being run.
• Any unusual noise at greasing points shall require immediate greasing regardless of the
maintenance period.
Use a grease type in the following table depending on the greasing point.
No. Greasing Point Grease Type
1 Blade cylinder foot pin greasing 1 pt
2 Blade cylinder rod end pin greasing 1 pt
3 Blade foot pin greasing 2 pt
Lithium grease
1. Lower the Blade to contact the ground prior to stop the engine.
2. Grease, by using a grease pump, to the grease fitting with arrow.
3. Cleanly wipe off the old grease that was pushed out after
greasing.

1-17
8. SPECIFICATIONS


CAUTION
In this section, the data indicated are exclusive for a Blade model but different from those of a
standard model. For data other than those, refer to the section: “SPECIFICATIONS” of the
LC785M-6 operation manual.
8.1 SPECIFICATIONS
System / Item LC785M-6B
Machine mass 10,250kg
Overall length x width x height 5,005mm x 2,350mm x 2，685mm
Distance between idler and sprocket 2,235mm
Track gauge 1,870mm
Track width 450mm
Mass and
dimensions
Lowest height from ground 360mm
Method Direct push with hydraulic cylinder
Blade maximum rising stroke 380mm
Blade system
Blade maximum lowering stroke 245mm
Hydraulic pump
Variable piston pump + dual gear pump
(Winch / Travel-right / Telescoping & Winch /
Derricking / Travel-left, Slewing & Control
valves)
Relief set pressure
20.6MPa (210kgf/cm２) (telescope, derrick),
24.6MPa (250kgf/cm２) (winch, travel),
19.2MPa （195kgf/cm２）(swing),
3.2MPa （32kgf/cm２）(control)
Hydraulic
system
Hydraulic oil tank capacity 126 liters

1-18
8.2 DIMENSIONS

