How it Works
Komatsu
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PC400
Service Manual
216 pgs12.71 Mb0
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Komatsu PC400, PC450LC -7, PC400LC -7, PC450 Service Manual

SEBM033000
MACHINE MODEL SERIAL No.
PC400-7 50001 and up PC400LC-7 50001 and up PC450-7 20001 and up PC450LC-7 20001 and up
• This shop manual may contain attachments and optional equipment that are not available in your area. Please consult your local Komatsu distributor for those items you may require. Materials and specifications are subject to change without notice.
© 2003 All Rights Reserved Printed in Japan 10-03 (01)
00-1
GENERAL

CONTENTS

No. of page

01 GENERAL
............................................................................................................................ 01-1
10 STRUCTURE, FUNCTION AND
MAINTENANCE STANDARD
20 TESTING AND ADJUSTING
............................................. To be issued next time
30 DISASSEMBLY AND ASSEMBLY
90 OTHERS
................................................................................................................................ 90-1
............................................ 10-1
......................... To be issued next time
00-2
(1)
PC400/450(LC)-7

01 GENERAL

SPECIFICATION DRAWINGS ......................................................................................................................01- 2
SPECIFICATIONS ........................................................................................................................................01- 4
WEIGHT TABLE............................................................................................................................................01- 8
FUEL, COOLANT AND LUBRICANTS .........................................................................................................01- 12
PC400/450(LC)-7
01-1
GENERAL SPECIFICATION DRAWINGS

SPECIFICATION DRAWINGS

DIMENSIONS
WORKING RANGES
01-2
PC400/450(LC)-7
GENERAL SPECIFICATION DRAWINGS
DIMENSIONS Fixed gauge specification
Item Unit PC400-7 PC400LC-7 PC450-7 PC450LC-7
A Overall length mm 11,940 11,940 12,040 12,040
B Overall height mm 3,635 3,635 3,660 3,660
C Overall width mm 3,340 3,440 3,340 3,340
D Track shoe width mm 600 700 600 600
E Height of machine cab mm 3,265 3,265 3,265 3,265
F Tail swing radius mm 3,645 3,645 3,645 3,645
G Track overall length mm 5,055 5,355 5,055 5,355
H Length of track on ground mm 4,020 4,350 4,020 4,350
Min. ground clearance mm 555 550 555 550
Variable gauge specification
Item Unit PC400-7 PC400LC-7 PC450-7 PC450LC-7
A Overall length mm 11,940 11,940 12,040 12,040
B Overall height mm 3,635 3,635 3,660 3,660
C Overall width mm 3,490 3,490 3,490 3,490
D Track shoe width mm 600 600 600 600
E Height of machine cab mm 3,265 3,265 3,265 3,265
F Tail swing radius mm 3,645 3,645 3,645 3,645
G Track overall length mm 5,055 5,355 5,055 5,355
H Length of track on ground mm 4,020 4,350 4,020 4,350
Min. ground clearance mm 685 685 685 685
WORKING RANGES
Working range Unit PC400-7 PC400LC-7 PC450-7 PC450LC-7
A Max. digging reach mm 12,025 12,025 12,005 12,005
B Max. digging depth mm 7,820 7,820 7,790 7,790
C Max. digging height mm 10,915 10,915 10,925 10,925
D Max. vertical wall depth mm 6,870 6,870 6,600 6,600
E Max. dumping height mm 7,565 7,565 7,625 7,625
F Min. dumping height mm — — — —
Max. reach at ground
G
level
mm 11, 820 11,8 20 11,8 00 11,800
PC400/450(LC)-7
01-3
GENERAL SPECIFICATIONS

SPECIFICATIONS

PC400-7, PC400LC-7

PC400-7 PC400LC-7
Machine model
Serial Number 50001 and up
Bucket capacity m
Weight of machine kg 41,200 42,400 42,200 43,500
Max. digging depth
Max. vertical wall depth
Max. digging reach
Max. reach at ground level
Max. digging height
Working ranges
Max. dumping height
Max. digging force
(using power max. function)
Performance
Swing speed
Swing max. slope angle
Travel speed
Gradeability
Ground pressure [standard shoe width]
Overall length (for transport)
Overall width
Overall width of track
Overall width of track when extended
Overall height (for transport)
Overall height to top of machine
Ground clearance of upper structure
Min. ground clearance
Tail swing radius
Dimensions
Min. swing radius of work equipment
Height of work equipment
at min. swing radius
Length of track on ground
Track gauge
Height of machine cab
3
mm
mm
mm
mm
mm
mm
kN {kg}
kN {kg}
rpm
deg.
km/h
deg.
kPa {kg/cm
[mm]
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
2
}
Fixed gauge
spec.
256.0 {26,100}
(274.6 {28,000})
Lo: 3.0, Mi: 4.4, Hi: 5.5
77.7{0.79}
[600]
11, 940
3,340
3,340
—
3,635
3,265
1,320
555
3,645
4,735
9,210
4,020
2,740
3,265
Variable
gauge spec
1.4 1.4
7,820
6,870
12,025
11,8 20
10,915
7,565
9.1
20
35
79.9 {0.82}
[600]
11,940
3,490
2,990
3,490
3,635
3,265
1,320
685
3,645
4,735
9,210
4,020
2,890
3,265
Fixed gauge
spec.
.
256.0 {26,100}
(274.6 {28,000})
Lo: 3.0, Mi: 4.4, Hi: 5.5
73.9 {0.75}
[700]
11, 940
3,440
3,440
—
3,635
3,265
1,320
555
3,645
4,735
9,210
4,020
2,740
3,265
gauge spec
7,820
6,870
12,025
11,8 20
10,915
7,565
9.1
20
35
65.3 {0.67}
Variable
.
[700]
11,9 40
3,490
2,990
3,490
3,635
3,265
1,320
685
3,645
4,735
9,210
4,020
2,890
3,265

: The “Mi” mode is on the multi-monitor specification machine only

01-4
PC400/450(LC)-7
GENERAL SPECIFICATIONS
Machine model PC400-7 PC400LC-7
Serial Number 50001 and up
Model Typ e
No. of cylinders – bore × stroke Piston displacement
Flywheel horsepower Max. torque Max. speed at no load
Engine
Min. speed at no load Min. fuel consumption
Performance
Starting motor Alternator Battery
Radiator core type ALW-4
Carrier roller 2 on each side
Track roller 7 on each side 8 on each side
Track shoe
Undercarriage
Type × No .
Delivery
Set pressure
Hydraulic pump
Type × No .
mm
l {cc}
kW/rpm {HP/rpm}
Nm/rpm {kgm/rpm}
rpm rpm
g/kWh {g/HPh}
l /min
MPa {kg/cm
2
}
4-cycle, water-cooled, in-line, vertical, direct injection,
with turbocharger and aftercooler
Assembly-type triple grouser,
45 on each side
HPV190+190, variable displacement, piston type x2
6-spool type + 1-spool type × 1
SAA6D125E-3
6 – 125 × 150
11.045 {11,045}
246.4/1,850 {330/1,850} 1,334/1,400 {136/1,400}
1,930 1,000
203 {151}
24V, 7.5 kW
24V, 35A
12V, 110 Ah × 2
Assembly-type triple grouser,
48 on each side
345 × 2
37.8 {380}
Control method
Control valve
Travel motor
Swing motor
Hydraulic motor
Hydraulic system
Type
Inside diameter of cylinder mm 160 185 160
Diameter of piston rod mm 110 120 110
Stroke mm 1,570 1,820 1,270
Hydraulic cylinder
Max. distance between pins mm 3,830 4,325 3,140
Min. distance between pins mm 2,260 2,505 1,870
Hydraulic tank Hydraulic filter Hydraulic cooler
KMV200ADT-2, Variable displacement, piston type
(with brake valve, parking brake): × 2
KMF230ABE-5, Fixed displacement piston type
(with safety valve, holding brake, reverse rotation preventive valve): × 1
Boom Arm Bucket
Double-acting
piston
Hydraulic
Double-acting
piston
Closed box type Tank return side
CF40-1 (Air cooled)
Double-acting
piston
PC400/450(LC)-7
01-5
GENERAL SPECIFICATIONS

PC450-7, PC450LC-7

PC450LC-7 PC450LC-7
Machine model
Serial Number 20001 and up
Bucket capacity m
Operating weight kg 42,700 44,000 43,700 44,600
Max. digging depth
Max. vertical wall depth
Max. digging reach
Max. reach at ground level
Max. digging height
Working ranges
Max. dumping height
Max. digging force
(using power max. function)
Performance
Swing speed
Swing max. slope angle
Travel speed
Gradeability
Ground pressure [standard shoe width]
3
mm
mm
mm
mm
mm
mm
kN {kg}
rpm
deg.
km/h
deg.
kPa {kg/cm
[mm]
2
}
Fixed gauge
spec.
258.9 {26,400}
(275.5 {28,300})
Lo: 3.0, Mi: 4.4, Hi: 5.5
80.5 {0.82} [600]
gauge spec
1.4 1.4
7,790
6,600
12,005
11,8 00
10,925
7,625
9.1
17
35
82.9 {0.85}
Var iable
[600]
Fixed gauge
spec.
.
258.9 {26,400}
(275.5 {28,300})
Lo: 3.0, Mi: 4.4, Hi: 5.5
76.5 {0.78} [600]
gauge spec
7,790
6,600
12,005
11,8 00
10,925
7,625
9.1
17
35
Var iable
.
78.1 {0.80} [600]
Overall length (for transport)
Overall width
Overall width of track
Overall width of track when extended
Overall height (for transport)
Overall height to top of machine
Ground clearance of upper structure
Min. ground clearance
Tail swing radius
Dimensions
Min. swing radius of work equipment
Height of work equipment
at min. swing radius
Length of track on ground
Track gauge
Height of machine cab
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
12,040
3,340
3,340
—
3,660
3,265
1,320
555
3,645
4,805
9,230
4,020
2,740
3,265

: The “Mi” mode is on the multi-monitor specification machine only

12,040
3,490
2,990
3,490
3,660
3,265
1,320
685
3,645
4,805
9,230
4,020
2,890
3,265
12,040
3,340
3,340
—
3,660
3,265
1,320
555
3,645
4,805
9,230
4,350
2,740
3,265
12,040
3,490
2,990
3,490
3,660
3,265
1,320
685
3,645
4,805
9,230
4,350
2,890
3,265
01-6
PC400/450(LC)-7
GENERAL SPECIFICATIONS
Machine model PC450-7
Serial Number 20001 and up
Model
Typ e
No. of cylinders – bore × stroke
Piston displacement
Flywheel horsepower
Max. torque
Max. speed at no load
Engine
Min. speed at no load
Performance
Min. fuel consumption
Starting motor
Alternator
Battery
Radiator core type ALW-4
Carrier roller 2 on each side
Track roller 7 on each side 8 on each side
mm
l {cc}
kW/rpm {HP/rpm}
Nm/rpm {kgm/rpm}
rpm
rpm
g/kWh {g/HPh}
4-cycle, water-cooled, in-line, vertical, direct injection,
with turbocharger and aftercooler
SAA6D125E-3
6 – 125 × 150
11.045 {11,045}
246.4/1,850 {330/1,850}
1,334/1,400 {136/1,400}
1,930
4,000
203 {151}
24V, 7.5 kW
24 V, 35 A
12V, 110 Ah × 2
PC450LC-7
Track shoe
Undercarriage
Type × No .
Delivery
Set pressure
Hydraulic pump
Type × No .
Control method
Control valve
Travel motor
Swing motor
Hydraulic motor
Hydraulic system
Cylinder type
Inside diameter of cylinder
Outside diameter of piston rod
Stroke
Hydraulic cylinder
Max. distance between pins
Min. distance between pins
Hydraulic tank
Hydraulic filter
Hydraulic cooler
l /min
MPa {kg/cm
mm
mm
mm
mm
mm
Assembly-type triple grouser,
45 on each side
HPV190+190, ariable displacement, piston type × 2
2
}
6-spool type + 1-spool type × 1
KMV200ADT-2, Variable displacement, piston type
(with brake valve, parking brake): × 2
KMF230ABE-5, Fixed displacement piston type × 2
(with safety valve, holding brake, reverse rotation preventive valve): × 1
Boom Arm Bucket
Double-acting piston Double-acting piston Double-acting piston
160 185 160
110 130 110
1,570 1,985 1,270
3,830 4,325 3,140
2,260 2,505 1,870
Closed box type
Tank return side
CF40-1 (Air cooled)
Assembly-type triple grouser,
48 on each side
345 × 2
37.8 {380}
Hydraulic
PC400/450(LC)-7
01-7
GENERAL WEIGHT TABLE

WEIGHT TABLE

PC400-7, PC400LC-7

k This weight table is for use when handling components or when transporting the machine.

Unit: kg

Machine model PC400-7 PC400LC-7
Serial Number 50001 and up
Engine assembly
•Engine
• Damper
• Hydraulic pump
Radiator, oil cooler assembly 195 195
Hydraulic tank, filter assembly (excluding hydraulic oil) 198 198
Fuel tank (excluding fuel) 251 251
Revolving frame 3,297 3,297
Operator's cab 279 279
Operator's seat 35 35
Counterweight 9,220 9,500
Swing machinery (including swing motor) 526 526
Control valve (with service valve) 257 257
Swing motor 105 105
Travel motor 208 × 2 208 × 2
Center swivel joint 40 40
Fixed gauge specification
• Track frame assembly
• Track frame
• • Center frame
• • Crawler frame
•Swing circle
•Idler
•Idler cushion
• Carrier roller
• Track roller
• Final drive (including travel motor)
10,173 11,367 10,965 11,934
5,506 6,766 6,077 7,096
1,500
1,150
14.7
210
Variable gauge
specification
—3,229—3,229
— 1,754 × 2 — 1,921 × 2
605 × 2
230 × 2
338 × 2
32 × 4
72 × 14
722 × 2
Fixed gauge specification
1,500
1,150
14.7
210
Variable gauge
605 × 2
230 × 2
338 × 2
32 × 4
72 × 16
722 × 2
specification
01-8
PC400/450(LC)-7
GENERAL WEIGHT TABLE
Unit: kg
Machine model PC400-7 PC400LC-7
Serial Number 50001 and up
Track shoe assembly
• Standard triple grouser shoe (600 mm)
• Standard triple grouser shoe (700 mm)
• Wide triple grouser shoe (800 mm)
• Wide triple grouser shoe (900 mm)
Boom assembly 3,290 3,290
Arm assembly 1,374 1,374
Bucket assembly 1,366 1,366
4,470
4,890
5,320
—
4,760
5,210
5,670
6,130
Boom cylinder assembly 355 × 2 355 × 2
Arm cylinder assembly 510 510
Bucket cylinder assembly 280 280
Link assembly 258 258
Boom pin 92 + 20 × 2 + 73 + 27 + 54 92 + 20 × 2 + 73 + 27 + 54
Arm pin 17 + 23 17 + 23
Bucket pin 38 × 2 38 × 2
Link pin 34 × 2 34 × 2
PC400/450(LC)-7
01-9
GENERAL WEIGHT TABLE

PC450-7, PC450LC-7

Unit: kg

Machine model PC450-7 PC450LC-7
Serial Number 20001 and up
Engine assembly
•Engine
• Damper
• Hydraulic pump
Radiator oil cooler assembly 195 195
Hydraulic tank, filter assembly (excluding hydraulic oil) 198 198
Fuel tank (excluding fuel) 251 251
Revolving frame 3,402 3,402
Operator’s cab 279 279
Operator’s seat 35 35
Counterweight 9,220 9,220
Swing machinery 526 526
Control valve 257 257
Swing motor 105 105
Travel motor 208 × 2 208 × 2
Center swivel joint 40 40
Fixed gauge specification
• Track frame assembly
• Track frame
• • Center frame
• • Crawler frame
•Swing circle
•Idler
•Idler cushion
• Carrier roller
• Track roller
• Final drive (including travel motor)
10,462 11,697 11,269 12,244
5,506 6,766 6,077 7,096
1,500
1,150
14.7
210
Variable gauge
specification
—3,229—3,229
— 1,754 × 2 — 1,921 × 2
605
230 × 2
338 × 2
32 × 4
81 × 6, 72 × 8
722 × 2
Fixed gauge specification
1,500
1,150
14.7
210
Variable gauge
605
230 × 2
338 × 2
32 × 4
81 × 8, 72 × 8
722 × 2
specification
01-10
PC400/450(LC)-7
GENERAL WEIGHT TABLE
Unit: kg
Machine model PC450-7 PC450LC-7
Serial Number 20001 and up
Track shoe assembly
• Standard triple grouser shoe (600 mm)
• Standard triple grouser shoe (700 mm)
• Wide triple grouser shoe (800 mm)
Boom assembly 3,380 3,380
Arm assembly 1,622 1,622
Bucket assembly 1,941 1,941
Boom cylinder assembly 355 × 2 355 × 2
Arm cylinder assembly 580 580
Bucket cylinder assembly 280 280
4,470
4,890
—
4,760
5,210
—
Link assembly 258 258
Boom pin 92 + 20 × 2 + 73 + 27 + 54 92 + 20 × 2 + 73 + 27 + 54
Arm pin 17 + 23 17 + 23
Bucket pin 38 × 2 38 × 2
Link pin 34 × 2 34 × 2
PC400/450(LC)-7
01-11
GENERAL FUEL, COOLANT AND LUBRICANTS

FUEL, COOLANT AND LUBRICANTS

01-12
PC400/450(LC)-7
10 STRUCTURE, FUNCTION AND
MAINTENANCE STANDARD
ENGINE RELATED PARTS..................... 10- 2
RADIATOR • OIL COOLER •
AFTERCOOLER ................................ 10- 3
POWER TRAIN ....................................... 10- 4
FINAL DRIVE .......................................... 10- 6
SWING MACHINERY .............................. 10- 8
SWING CIRCLE ...................................... 10- 10
TRACK FRAME AND RECOIL SPRING . 10- 12
IDLER ...................................................... 10- 14
CARRIER ROLLER ................................. 10- 16
TRACK ROLLER ..................................... 10- 17
TRACK SHOE ......................................... 10- 18
HYDRAULIC PIPING DRAWING ............ 10- 22
HYDRAULIC TANK.................................. 10- 24
HYDRAULIC PUMP ................................ 10- 26
LS(PC)-EPC VALVE ................................ 10- 44
VARIABLE VOLUME VALVE .................. 10- 47
CONTROL VALVE ................................... 10- 50
MAIN RELIEF VALVE .............................. 10- 64
CLSS ....................................................... 10- 66
SELF PRESSURE REDUCING VALVE... 10- 69
SWING MOTOR ...................................... 10- 72
CENTER SWIVEL JOINT ........................ 10- 80
TRAVEL MOTOR..................................... 10- 82
TRAVEL JUNCTION VALVE .................... 10- 93
VALVE CONTROL ................................... 10- 95
TRAVEL PPC SHUTTLE VALVE ............. 10- 96
WORK EQUIPMENT • SWING PPC
VALVE ................................................ 10-100
TRAVEL PPC VALVE .............................. 10-104
SERVICE PPC VALVE ............................ 10- 111
SOLENOID VALVE .................................. 10-112
PPC ACCUMULATOR............................. 10-114
RETURN OIL FILTER ............................. 10-115
BOOM HYDRAULIC DRIFT
PREVENTION VALVE........................ 10-116
ARM HYDRAULIC DRIFT PREVENTION
VALVE ................................................ 10-121
QUICK RETURN VALVE......................... 10-125
LIFT CHECK VALVE................................ 10-127
ATTACHMENT CIRCUIT SELECTOR
VALVE................................................ 10-128
HOLDING VALVE .................................... 10-130
HYDRAULIC CYLINDER......................... 10-136
WORK EQUIPMENT ............................... 10-138
AIR CONDITIONER ................................ 10-144
ENGINE CONTROL .................................10-145
ELECTRONIC CONTROL SYSTEM........10-151
MONITOR SYSTEM.................................10-178
SENSOR ..................................................10-198
PC400/450(LC)-7
10-1
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD ENGINE RELATED PARTS

ENGINE RELATED PARTS

1. Drive plate 5. Damper assembly

2. Torsion spring 6. Muffler

3. Stopper pin 7. Rear engine mount

4. Friction plate 8. Front engine mount

10-2
Outline
• The damper assembly is a wet type.
Oil capacity: 1.3 l
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD RADIATOR • OIL COOLER • AFTERCOOLER
RADIATOR • OIL COOLER • AFTERCOOLER

1. Oil cooler 10. Condenser

2. Radiator 11. Fuel cooler

3. Radiator cap

4. Reservoir tank

5. Net

6. Shroud

7. Radiator inlet hose

8. Radiator outlet hose

9. Aftercooler

PC400/450(LC)-7
Specifications
Radiator : ALW-4 Oil cooler : CF40-1
10-3
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD POWER TRAIN

POWER TRAIN

1. Idler 7. Hydraulic pump (HPV190+190)

2. Center swivel joint 8. Travel speed solenoid valve

3. Control valve 9. Swing brake solenoid valve

4. Final drive 10. Swing machinery

5. Travel motor (KMV 200ADT-2) 11. Swing motor (KMF230ABE-5)

6. Engine (SAA6D125-3E) 12. Swing circle

10-4
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD FINAL DRIVE

FINAL DRIVE

10-6
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD FINAL DRIVE

1. Level plug

2. Drain plug

3. No. 1 planetary gear (No. of teeth: 43)

4. No. 1 sun gear (No. of teeth: 10)

5. No. 2 sun gear (No. of teeth: 18)

6. No. 1 planetary carrier

7. No. 2 planetary carrier

8. Cover

9. Ring gear (No. of teeth: 98)

10. Sprocket

11. Floating seal

12. Travel motor

13. No. 2 planetary gear (No. of teeth: 38)

Specification
Reduction ratio:
10 + 98
– × = –68.600
10
18 + 98
18
Unit: mm
No. Check item Criteria Remedy
Backlash between No. 1 sun
14
gear and No. 1 planetary gear
Backlash between No. 1
15
planetary gear and ring gear
Backlash between No. 2
16
planetary carrier and motor
Backlash between No. 2 sun
17
gear and No. 2 planetary gear
Backlash between No. 2 plan-
18
etary gear and ring gear
Backlash between No. 2
19
planetary carrier and No. 2 sun gear
Amount of wear on sprocket
20
tooth
21 Width of sprocket tooth
Standard clearance Clearance limit
0.15 – 0.54 1.10
0.18 – 0.66 1.30
0.06 – 0.24 —
0.15 – 0.51 1.00
0.17 – 0.60 1.20
0.15 – 0.54 —
Repair limit: 6
Standard size Repair limit
90 87
Replace
Rebuild or replace
PC400/450(LC)-7
10-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD SWING MACHINERY

SWING MACHINERY

10-8
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD SWING MACHINERY

1. Swing pinion (No. of teeth: 13)

2. Cover

3. Case

4. No. 2 planetary gear

5. No. 2 sun gear

6. Ring gear

7. No. 1 sun gear

8. Swing motor

9. Oil level gauge

10. No. 1 planetary gear

11. No. 1 planetary carrier

12. No. 2 planetary carrier

13. Drain plug

Specification
Reduction ratio:
19 + 68
19
16 + 68
× = 24.039
16
Unit: mm
No. Check item Criteria Remedy
Backlash between swing
14
motor shaft and No. 1 sun gear
Backlash between No. 1 sun
15
gear and No. 1 planetary gear
Backlash between No. 1
16
planetary gear and ring gear
Backlash between No. 1
17
planetary carrier and No. 2 sun gear
Backlash between No. 2 sun
18
gear and No. 2 planetary gear
Backlash between No. 2
19
planetary gear and ring gear
Backlash between coupling
20
and swing pinion
Backlash between swing pin-
21
ion and swing circle
Standard clearance Clearance limit
0.18 – 0.28 —
0.15 – 0.51 1.00
0.17 – 0.60 1.10
0.40 – 0.75 1.20
Replace
0.16 – 0.55 1.00
0.17 – 0.60 1.10
0.08 – 0.25 —
0.00 – 1.21 2.00
Clearance between plate
22
and coupling
Wear of swing pinion surface
23
contacting with oil seal
PC400/450(LC)-7
0.57 – 1.09 —
Standard size Repair limit Apply hard
chrome plat-
150
0
–0.100
—
ing, recondi­tion, or replace
10-9
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD SWING CIRCLE

SWING CIRCLE

1. Swing circle inner race (No. of teeth: 84)

2. Ball

3. Swing circle outer race

a. Inner race soft zone “S” position b. Outer race soft zone “S” position
No. Check item Criteria Remedy
Axial clearance of bearing
4
(when mounted on chassis)
Standard clearance Repair limit
0.5 – 1.6 3.2
10-10
Specifications
Reduction ratio: – =
Amount of grease: 33 l (G2-LI)
84 13
6.462
–
Unit: mm
Replace
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD TRACK FRAME AND RECOIL SPRING

TRACK FRAME AND RECOIL SPRING

1. Idler

2. Track frame

3. Carrier roller

4. Final drive

5. Track roller

6. Track shoe

7. Center guard

8. Recoil spring

9. Front guard

10-12
• The dimensions and the number of track rollers depend on the model, but the basic structure is not different.
• Number of track rollers
Model Q’ty
PC400-7, 450-7 7
PC400LC-7, 450LC-7
8
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD TRACK FRAME AND RECOIL SPRING
Standard shoe
Model
Item
Shoe width 600 mm 700 mm 600 mm 600 mm
Link pitch 228 mm 228 mm 228 mm 228 mm
No. on track (one side) 46 (Pieces) 46 (Pieces) 49 (Pieces) 49 (Pieces)
PC400-7 PC400LC-7 PC450-7 PC450LC-7
Unit: mm
No. Check item Criteria Remedy
10 Vertical width of idler guide
11 Horizontal width of idler guide
12 Recoil spring
Standard
size
Track frame 123 127
Idler support 120 ±0.5 118
Track frame 266 271
Idler support 261 — 259
Standard size Repair limit
Free length
× OD
795 × 241 648
Installation
length
Installation
load
173.3 kN
{17,680 kg}
Tolerance Repair limit
+2 –1
+3 –1
Free length
—
Installation
load
138.56 kN
{14,140 kg}
Rebuild or replace
Replace
PC400/450(LC)-7
10-13
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD IDLER

IDLER

10-14
PC400/450(LC)-7
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
Unit: mm
No. Check item Criteria Remedy
+0.360 +0.220
–0.027 –0.079
Repair limit
Rebuild or replace
Standard
clearance
0.340 –0.507
Replace bushing
Standard
interference
0.064 –0.149
Outside diameter of protrud-
1
ing
2 Outside diameter of tread 660 648
3 Depth of tread 22 28
4 Total width 202 —
5 Width of tread 48.5 —
Clearance between shaft and
6
bushing
Interference between idler
7
and bushing
Standard size
Standard size
Standard size
95
102.6
704 —
To le ra n c e
Shaft Hole
–0.120 –0.207
To le ra n c e
Shaft Hole
+0.087 +0.037
PC400/450(LC)-7
10-15
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD CARRIER ROLLER

CARRIER ROLLER

Unit: mm
No. Check item Criteria Remedy
1 Outside diameter of flange
2 Outside diameter of tread 148 134
3 Width of tread 50.3 —
4 Thickness of tread 32 25
5 Width of flange 19 —
Standard
Interference between shaft
6
and bushing
Interference between roller
7
and bushing
8 Axial clearance of roller
10-16
Standard size Repair limit
175 —
To le r a nc e
size
50
57
Standard clearance Clearance limit
Shaft Hole
–0.250 –0.270
+0.117
+0.087
0.5 – 0.7 —
+0.099
–0.032
+0.040
0
Standard
interference
0.218 –
0.369
0.047 –
0.177
Interference
limit
—
—
PC400/450(LC)-7
Replace
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