Maeda MC-174CRM User manual

101E-SM1002-00
SERVICE MANUAL
MINI-CRAWLER CRANE
Serial No. G0121 and up
The parts numbers and lists written in this service manual are the
references for the services such as disassembling and assembling.
Be sure to ALWAYS refer to the latest parts catalog (the latest
information) before ordering any part, since the parts and the
model numbers are subject to change during the endless
improvements and changes of our Machine.

0-1
CONTENTS
ITEM
Page
GENERAL
1-1
1.SPECIFICATIONDIMENSIONNALDRAWING
1-2
2.DIMENSIONNALDRAWINGOFOUTRIGGERWIDTH
1-3
3. PRINCIPLE SPECIFICATIONLIST
1-4
4.WORKINGRADIUSLIFTINGHEIGHT
1-5
5.TOTALRATEDLOADCHART
1-6
6.STANDARDPRESSUREANDOPERATINGTIMECHART
1-9
6.1OUTRIGGER
1-9
6.2CRANEOPERATION
1-9
6.3TRAVELLINGOPERATION
1-9
7. POWERTRAINDRAWING
1-10
CONSTRUCTION&MAINTENANCE
2-1
1.HYDRAULICCERCUITDIAGRAM
2-3
2.HYDRAULIC PIPING
2-6
2.1CRANEROTATIONPORTION
2-6
2.2 CRANEFIXEDPORTION
2-8
2.3 TRAVELLINGLINE
2-10
2.4OUTRIGGERLINE
2-12
2.5PUMP,TANK,DRAINAND PILOTLINE
2-14
3.HYDRAULIC OILTANK
2-18
3.1SUCTIONFILTER
2-20
3.2RETURNFILTER
2-21
4.RETURNMANIFOLD BLOCK
2-22
5.ENGINEASSEMBLY
2-23
5.1ENGINESPECIFICATIONS
2-23
52.2ENGINEEXTERIORVIEW
2-24
5.3EACHSECTIONNAME
2-26
6. HYDRAULICOILPUMP
2-28
6.1EXTERIOR VIEW ANDSPECIFICATIONS
2-28
6.2 INNERPARTS
2-29
6.3P–QCHART
2-30
6.4 BASICSOF FUNCTIONALITY
2-31
6.5TROUBLESHOOTING
2-33
7.TRAVELLINGCONTROLVALVE
2-34
7.1 EXTERIORVIEW ANDSPECIFICATIONS
2-34
7.2 INNER PARTS
2-35
7.3 INSPECTIONANDADJUSTMENT
2-36
7.4 TROUBLESHOOTING
2-37

0-2
ITEM
Page
8.TRAVELLINGMOTOR
2-38
8.1 EXTERIOR VIEW ANDSPECIFICATIONS
2-38
8.2 INNER PARTS
2-39
8.3 BASICSOF FUNCTIONALITY
2-40
8.4FUNCTION
2-41
9. OUTRIGGERCONTROLVALVE
2-46
9.1 EXTERIORVIEW ANDSPECIFICATIONS
2-46
9.2 INNER PARTS
2-48
10.CRANECONTROLVALVE
2-50
10.1EXTERIORVIEW
2-50
10.2OUTLINE
2-51
10.3 HYDRAULIC CIRCUITDIAGRAM
2-52
10.4FUNCTIONOFEACHSECTION
2-53
10.5TROUBLESHOOTING
2-61
11. TRAVELLING SPEEDSELECTOR VALVE
2-62
11.1EXTERIORVIEW ANDSPECIFICATIONS
2-62
11.2INSPECTIONANDADJUSTMENT
2-63
11.3TROUBLESHOOTING
2-63
12.ROTARYJOINT
2-64
12.1EXTERIORVIEW ANDSPECIFICATIONS
2-64
12.2INNERPARTS
2-66
13.HOOKBLOCK
2-68
13.1HOOKBLOCKINSPECTION
2-70
14.BOOMSYSTEM
2-72
15. TELESCOPING ANDDERRICKINGCYLINDER
2-76
15.1TELESCOPINGCYLINDER
2-76
15.2TELESCOPINGCYLINDER HYDRAULICCIRCUIT SYSTEM
2-79
15.3COUNTERBALANCEVALVE(FORTELESCOPING ANDDERRICKINGCYLINDER)
2-80
15.4SEQUENCEVALVE(FORTELESCOPING CYLINDER)
2-82
15.5MECHANICALCHECK VALVE(FORTELESCOPING CYLINDER)
2-83
15.6LEFT SIDEDERRICKINGCYLINDER
2-84
15.7RIGHTSIDEDERRICKINGCYLINDER
2-86
16.WINCHSYSTEM
2-88
16.1EXTERIORVIEW OFWINCHUNIT
2-88
16.2MECHANICALBRAKEINNERPAERTS ANDSPECIFICATIONS
2-90
16.3EXTERIORVIEW ANDSPECIFICATIONSOFWINCHMOTOR
2-92
17.SLEWINGSYSTEM
2-94
17.1EXTERIORVIEW
2-94
17.2SLEWING REDUCTIONGEAR
2-96
17.3SLEWING MOTOR EXTERIORVIEW AND SPECIFICATIONS
2-97

0-3
ITEM
Page
18.OUTRIGGER SYSTEM
2-98
18.1EXTERIORVIEW OFNo.1OUTRIGGER
2-98
18.2EXTERIORVIEW OFNo.2OUTRIGGER
2-100
18.3EXTERIORVIEW OFNo.3OUTRIGGER
2-102
18.4EXTERIORVIEW OFNo.4OUTRIGGER
2-104
19.OUTRIGGERCYLINDER
2-106
19.1EXTERIOR VIEW ANDSPECIFICATIONS
2-106
19.2INNERPARTS
2-108
19.3DOUBLEPILOTCHECKVALVE
2-110
20.ASSEMBLYANDDISASSEMBLYOFBOOM
2-112
21.ELECTRICCIRCUITDIAGRAM
2-119
22.ELECTRICSYSTEMDRAWING
2-120
MOMENTLIMITER
3-1
1. MOMENTLIMITER PARTS
3-2
1.1DISPLAYUNITANDCONVERTER
3-2
1.2OUTRIGGER POSITIONDETECTOR
3-4
1.3OUTRIGGEROPENINGDETECTOR
3-6
1.4OUTRIGGEREXTENDINGDETECTOR
3-8
1.5BOOMSTATEDETECTOR
3-10
1.6LOADDETECTOR
3-16
1.7MOMENTLIMITERACCESSORY
3-18
1.8OVER UN-WINDINGDETECTOR
3-20
1.9OVER HOISTINGSTOPSYSTEM
3-22
2. MOMENTLIMITEROVERVIEW ANDFEATURES
3-25
3. EXTERNAL VIEW OFMOMENTLIMITER
3-26
3.1 DISPLAYUNIT
3-26
3.2CONVERTER
3-27
4. SYSTEMDIAGRAM
3-28
5. CONNECTORDIAGRAM
3-29
6. CONNECTORPIN ASSIGNMENT
3-30
6.1 CONVERTERCONNECTORS
3-30
6.2DISPLAYUNITCONNECTORS
3-31
7. INPUT/OUTPUT
3-32
7.1 CONVERTER
3-32
7.2 DISPLAYUNIT
3-32
8. DISPLAYS
3-34
9.SWITCHES
3-36
10.DISPLAYUNIT;DETAILOFEACHSEGMENT
3-38
11.START–UPSEQUENCE
3-39
12.MOMENTLIMITERFUNCTIONS
3-39
13.DISPLAYOF SPECIFICINDICATORS
3-40
14.OPERATIONRANGELIMITATIONCONTROL
3-41

0-4
ITEM
Page
15.CALIBRATIONPROCEDURE
3-42
15.1LISTOFITEMS
3-42
15.2PROCEDURE
3-43
15.3DISPLAYDETAILSATCALIBRATIONMODE
3-51
16. TESTMODE
3-52
16.1 CALLOUTOFTESTMODE
3-52
16.2L01(ROM/RAMTest)
3-53
16.3L02(LEDTEST)
3-53
16.4L03(SwitchTest)
3-53
16.5L04(OutriggerExtensionValue/BoomDerrickingOperationInputSignalTest)
3-54
16.6L05(OutputSignalTest)
3-55
16.7L06(4to20mATest)
3-55
16.8L07(TestforInputVoltageValuefromEachSensor)
3-56
16.9L08(LoopBackTest)
3-56
17.ERRORMESSAGES
3-57
18.TROUBLESHOOTING
3-58
19.POINTSFORINPUTVOLTAGEMEASUREMENTOFEACHSENSOR
3-60
REMOTECONTROL
4-1
1.INITIAL MODE SETTING PROCEDURE
4-2
1.1BUTTONANDLEVER ARRANGEMENTONCONTROLPANEL
4-2
1.2ESTABLISHINGINITIALMODE:
4-3
1.3 INITIALMODEFORUSER(AMODE)
4-4
1.4INITIALMODEFORSERVICE(BMODE)
4-7
1.5INITIALMODEFORMAKER(CMODE)
4-10
1.6INITIALMODESETTING(For interactiveremotecontroller)
4-13
2. RECEIVER
4-16
2.1 EXTERIORVIEW
4-16
2.2CONTROLPRINT CARDLACATIONS
4-18
2.3MONITORDISPLAYMESSAGE
4-22
3.TROUBLESHOOTING
4-23

1-1
GENERAL
1.SPECIFICATIONDIMENSIONALDRAWING
1-2
2. DIMENSIONALDRAWINGOFOUTRIGGERWIDTH
1-3
3. PRINCIPLE SPECIFICATIONLIST
1-4
4.WORKINGRADIUSLIFTINGHEIGHT
1-5
5.TOTALRATEDLOADCHART
1-6
6.STANDARDPRESSUREANDOPERATINGTIMECHART
1-9
7. POWERTRAINDRAWING
1-10

1-2
1. SPECIFICATION DIMENSIONAL DRAWING

1-3
2. DIMENSIONAL DRAWING OF OUTRIGGER WIDTH

1-4
3. PRINCIPLE SPECIFICATION LIST
System/Item
MC-174CRM
Massand
dimensions
Machinemass
1290kg
Overalllengthwidthheight
2000mmx590mmx1300mm
Distancebetweenidlerandsprocket
1044mm
Track gauge
410mm
Track width
180mm
Capacity
Maximumtotalratedload
workingradius
1.72tx1.0m
Maximum workingradius
5.17m
Maximumliftingheight
5.5m
Winchsystem
Method
Hydraulicpistonmotordrive,reductionspurgear,
mechanicalbrake
Windingspeed
10.9m/min (3layers,4falls)
Hoistingrope
IWRC6xFi(29)0/0φ6 x 35m
Boom
telescoping
system
Method
Sequentiallytelescopinghydrauliccylinder(2pieces)+
Wireropeexpansiondevice(1piece)
(Withahydraulic automaticlockingdevice)
Boomtype
Pentagonalsection,hydraulicautomaticextension,
4-stageboom(Stage3/4:Simultaneoustelescoping)
Boom length
1.83m–2.97m–4.21m–5.45m
Boomtelescopingstroke/
time
3.62m/15sec
Boom
derricking
system
Method
Directpush-typehydraulicdouble-actingcylinder(2pieces),
(Withahydraulic automatic lockingdevice)
Derrickangle/time
3to77deg./12sec
Slewing
system
Method
Swing bearing,trochoidmotordrive,
Reductiongear:Worm+Reductionspurgear,
Brake:Worm-selflock
Slewingangle/speed
360 deg.(continuous)/2rpm
Outrigger
system
Method
1ststagewithflexiblestaydamper, 2ndstagemanualpull-out,
hydrauliccylinderdirectacting
Overallwidthofextended outriggers
(Front)3060mmx(Right/left)3335mmx(Rear)2885mm
Travelling
system
Method
Hydraulictwo-speedmotordrive,Variablespeed,
Built-inbrake
Travelspeed
Highspeed
Forward/backward:0–3.3km/h
Lowspeed
Forward/backward:0–2.0km/h
Gradeability
20deg.
Groundpressure
33.7kPa(0.34kgf/cm2)
Hydraulic
system
Hydraulicpump
Double-throwvariablepistonpump(8.6cc/rev2)
Ratedpressure
20.6MPa(210kgf/cm2)
Hydraulicoiltankcapacity
20 litres
Engine
Model
MitsubishiGM401LE
Type
1-cylinder,Aircooled,4-cyclegasolineengine
Displacement
0.391litres(391cc)
Ratedoutput(continuous)
6.6kW/1800min-1 (9.0PS/1800rpm)
Fueltankcapacity
Lead-freegasoline/6litres
Battery
Model
30A19R(DC12Vx1piece)
Safetydevice
Over hoist detector/automatic stop device, hydraulic safety valve, hydraulic automatic locking device, slinging
rope detachment protector, alarm buzzer, level, crane inclination alarm (travel mode : more than 15 degree,
crane & outrigger mode :more than3 degree), moment limiter (working envelope limited), working status lamp,
overun-windingdetector

1-5
4. WORKING RADIUS AND LIFTING HEIGHT

1-6
5. TOTAL RATED LOAD CHART
TheTotal rated loadChartis based on actual workingradiuswiththe bendingof boom attributable to loadreflectedand is shown
withthemassof hookblock(20kg)included.
[1]TOTALRATEDLOADCHART FOR4FALLS
OutriggerExtendedtoMaximum
1.83m BOOM
2.97m BOOM
4.21m BOOM
5.45m BOOM
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load (kg)
1.0orless
1720
1.0orless
1720
1.3orless
1320
1.7orless
770
1.3
1320
1.3
1320
1.5
1120
2.0
700
1.55
1090
1.5
1120
2.0
820
2.5
660
--
--
2.0
820
2.5
670
2.8
580
--
--
2.5
670
3.0
530
3.0
530
--
--
2.69
580
3.5
420
3.5
410
--
--
--
--
3.93
370
4.0
330
--
--
--
--
--
--
4.5
270
--
--
--
--
--
--
5.17
220
OutriggerExtendedtoOtherthanMaximum
1.83m BOOM
2.97m BOOM
4.21m BOOM
5.45m BOOM
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
1.0orless
1220
1.0orless
1220
1.3orless
940
1.7orless
720
1.3
940
1.3
940
1.5
810
2.0
600
1.55
790
1.5
810
2.0
600
2.5
390
--
--
2.0
600
2.5
390
2.8
330
--
--
2.5
390
3.0
300
3.0
300
--
--
2.69
310
3.5
220
3.5
220
--
--
--
--
3.93
180
4.0
180
--
--
--
--
--
--
4.5
140
--
--
--
--
--
--
5.17
100
Hookblock:20kg

1-7
[2] TOTALRATEDLOADCHARTFOR2FALLS
OutriggerExtendedtoMaximum
1.83m BOOM
2.97m BOOM
4.21m BOOM
5.45mBOOM
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
1.0orless
860
1.0orless
860
1.3orless
860
1.7orless
770
1.3
860
1.3
860
1.5
860
2.0
700
1.55
860
1.5
860
2.0
820
2.5
660
--
--
2.0
820
2.5
670
2.8
580
--
--
2.5
670
3.0
530
3.0
530
--
--
2.69
580
3.5
420
3.5
410
--
--
--
--
3.93
370
4.0
330
--
--
--
--
--
--
4.5
270
--
--
--
--
--
--
5.17
220
OutriggerExtendedtoOtherthanMaximum
1.83m BOOM
2.97m BOOM
4.21m BOOM
5.45m BOOM
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
1.0orless
860
1.0orless
860
1.3orless
860
1.7orless
720
1.3
860
1.3
860
1.5
810
2.0
600
1.55
790
1.5
810
2.0
600
2.5
390
--
--
2.0
600
2.5
390
2.8
330
--
--
2.5
390
3.0
300
3.0
300
--
--
2.69
310
3.5
220
3.5
220
--
--
--
--
3.93
180
4.0
180
--
--
--
--
--
--
4.5
140
--
--
--
--
--
--
5.17
100
Hookblock:20kg

1-8
[3] TOTALRATEDLOADCHARTFORSINGLE FALL
OutriggerExtendedtoMaximum
1.83m BOOM
2.97m BOOM
4.21m BOOM
5.45m BOOM
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
1.0orless
430
1.0orless
430
1.3orless
430
1.7orless
430
1.3
430
1.3
430
1.5
430
2.0
430
1.55
430
1.5
430
2.0
430
2.5
430
--
--
2.0
430
2.5
430
2.8
430
--
--
2.5
430
3.0
430
3.0
430
--
--
2.69
430
3.5
420
3.5
410
--
--
--
--
3.93
370
4.0
330
--
--
--
--
--
--
4.5
270
--
--
--
--
--
--
5.17
220
OutriggerExtendedtoOtherthanMaximum
1.83m BOOM
2.97m BOOM
4.21m BOOM
5.45m BOOM
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
Working
radius(m)
Totalrated
load(kg)
1.0orless
430
1.0orless
430
1.3orless
430
1.7orless
430
1.3
430
1.3
430
1.5
430
2.0
430
1.55
430
1.5
430
2.0
430
2.5
390
--
--
2.0
430
2.5
390
2.8
330
--
--
2.5
390
3.0
300
3.0
300
--
--
2.69
310
3.5
220
3.5
220
--
--
--
--
3.93
180
4.0
180
--
--
--
--
--
--
4.5
140
--
--
--
--
--
--
5.17
100
Hookblock:10kg

1-9
6. STANDARD PRESSURE AND OPERATING TIME CHART
6.1 OUTRIGGER
(WhenOilTemperature30-50°C)
WhenFullAccelerating
OperatingPressure(MPa)
(AtTravelling controlvalve)
Operatingtime(sec)
FrontOutriggerSlide(1),(4)(1-piece)
Extend
17.4±1
8.4±2
Retract
19.6±1
9.4±2
RearOutriggerSlide(2),(3)(1-piece)
Extend
17.5±1
8.3±2
Retract
19.4±1
9.2±2
6.2 CRANE OPERATION
(WhenOilTemperature30-50°C)
WhenFullAccelerating
OperatingPressure(MPa)
(AtTravelling controlvalve)
Operatingtime(sec)
BoomDerricking
(0–80 deg.)
Raise
4.5±1
8.4±1
Lower
16.3±1
13.2±1
Hoisting(2m,2-boom)
Raise
3.3±1
5.3±1
Lower
5.2±1
5.4±1
BoomTelescoping
(No.1boomtoNo.4boom)
Extend
3.7±1
15.3±1
Retract
17.6±1
21.7±2
Slewing(360deg.)
Clockwise
11±1
30.2±3
6.3 TRAVELLING OPERATION
(WhenOilTemperature30-50°C)
WhenFullAccelerating
OperatingPressure(MPa)
(AtTravelling controlvalve)
Operatingtime(sec)
StraightTravelling (20m)
Forward 1stspeed
5.2±1
36.7
Forward 2ndspeed
8.5±1
20.9
6.4 MICRO SPEED
(WhenOilTemperature30-50°C)
MicroSpeed
1
2
3
Setting value
10
18
60
Windingspeed(m/min)
0.094
0.168
6.59

1-10
7. POWER TRAIN DRAWING

2-1
CONSTRUCTION &
MAINTENANCE
1.HYDRAULIC CERCUITDIAGRAM
2-3
2.HYDRAULIC PIPING
2-6
3.HYDRAULIC OILTANK
2-18
4.RETURN MANI-BLOCK
2-22
5. ENGINEASSEMBLY
2-23
6. HYDRAULICOIL PUMP
2-28
7.TRAVELLINGCONTROLVALVE
2-34
8.TRAVELLINGMOTOR
2-38
9.CRANECONTROL VALVE
2-46
10. OUTRIGGERCONTROLVALVE
2-58
11. TRAVELLING SPEEDSELECTVALVE
2-46
12.ROTARYJOINT
2-64
13.HOOKBLOCK
2-68
14.BOOM
2-72
15. TELESCOPING ANDDERRICKINGCYLINDER
2-76
16.WINCH
2-88
17.SLEWINGSYSTEM
2-94
18.OUTRIGGER
2-98
19.OUTRIGGERCYLINDER
2-106
20.ASSEMBLYANDDISASSEMBLYOFBOOM
2-112
21.ELECTRICCIRCUITDIAGRAM
2-119
22.ELECTRICSYSTEMDRAWING
2-120

2-2

2-3
1. HYDRAULIC CERCUIT DIAGRAM

2-4