D155 AX-5

SEBM038800

KOMATSU-iBLADE Specification MACHINE MODEL

SERIAL No.

D155AX-5

76001 and up

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This manual contains only information related to the KOMATSU-iBlade Specification. For other information, see the D155AX-5 Shop Manual SEBM034806.

•

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.

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D155AX-5 mounts the SA6D140E-3 engine. For details of the engine, see the 140-3 Series Engine Shop Manual.

© 2005 All Rights Reserved Printed in Japan 03-05 (01)

00-1

GENERAL

CONTENTS No. of page

01 GENERAL ............................................................................................................................

01-1

10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD............................................

10-1

30 DISASSEMBLY AND ASSEMBLY

..................................................... 30-1

90 OTHERS ................................................................................................................................

00-2

90-1

D155AX-5

01 GENERAL SPECIFICATION DRAWING ........................................................................................................................01- 2

D155AX-5

01-1

GENERAL

SPECIFICATION DRAWING

SPECIFICATION DRAWING

Item

Unit

Full U-tilt dozer + Giant ripper

U-tilt dozer + Giant ripper

Semi U-tilt dozer + Multi-shank ripper

Full U-tilt dozer + Multi-shank ripper

A

Overall length

mm

8,550

8,155

8,155

8,550

B

Overall height

mm

4,195

4,195

4,195

4,195

C

Overall width

mm

4,265

3,955

3,955

4,265

01-2

D155AX-5

10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD WORK EQUIPMENT CONTROL..................................................................................................................10- 2 PPC VALVE...................................................................................................................................................10- 4

D155AX-5

10-1

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

WORK EQUIPMENT CONTROL

WORK EQUIPMENT CONTROL •

The drawing shows a pitch dozer and pin puller installed vehicle.

10-2

D155AX-5

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. 2. 3. 4.

WORK EQUIPMENT CONTROL

Work equipment lock lever Blade control lever Blade automatic control ON/OFF selector switch PPC lock valve

Lever positions A. Blade HOLD B. Blade LOWER C. Blade FLOAT D. Blade RAISE E. Blade (left tilt) F. Blade (right tilt) M. FREE N. LOCK O. Blade automatic control selector switch OFF P. Blade automatic control selector switch ON Outline • The work equipment control employs a PPC system which uses a PPC valve to move the spools of the control valve. • Work equipment lock lever (1) is interconnected with PPC lock valve (4), and when it is at the LOCK position, the flow of oil in the PPC circuit is stopped.

D155AX-5

10-3

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

PPC VALVE

PPC VALVE For blade lift and tilt

1. PPC valve 2. Shuttle valve 3. EPC valve

10-4

PPPC : From manual/auto selector valve port B1 (via PPC lock valve) T : To hydraulic tank PEPC : From manual/auto selector valve port P1 PC1 : To blade lift valve (LOWER) port P3 (via junction block B2) PC2 : To blade lift valve (RAISE) port P4 PC3 : To blade lift valve (LEFT TILT) port PA1 PC4 : To blade lift valve (RIGHT TILT) port PB1

D155AX-5

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

PPC VALVE

Function • The EPC solenoid valve consists of the proportional solenoid valve portion and the oil pressure block. • From the control box (TOPCON), an electric signal is sent to the EPC valve according to the amount that right control lever is moved. • When signal current i is received from the control box, an EPC output is generated in proportion to the level of the current to drive the work equipment valve. The shuttle valve supplies the higher output of the PPC valve and EPC valve to the work equipment valve to drive the spool.

Operation 1. When signal current is 0 (coil deenergized) • When there is no signal current flowing from the controller to coil (9), coil (9) is deenergized. • For this reason, spool (6) is pushed to the right in the direction of the arrow by spring (7). • As a result, port P is closed, and the pressurized oil passing through the PPC and EPC charge valve from the charge pump does not flow to the control valve. At the same time, pressurized oil from the control valve flows from port C through port T and is drained to the tank.

D155AX-5

10-5

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

PPC VALVE

2. When signal current is small (coil excited, during fine control ) • When a small signal current flows to coil (9), coil (9) is excited and a propulsion force pushing to the left in the direction of the arrow is generated in plunger (10). • Push pin (8) pushes spool (6) to the left in the direction of the arrow and pressurized oil flows from port P to port C. • The pressure at port C rises and the force acting on face a of spool (6) + the spring load of spring (7) becomes greater than the propulsion force of plunger (10). When this happens, spool (6) is pushed to the right, port P and port C are shut off, and at the same time, port C and port T are connected. • As a result, spool (6) moves to the left or right to a position where the propulsion force of plunger (10) is balanced with the pressure at port C + the spring force of spring (7). • Therefore, the circuit pressure between the EPC valve and the control valve is controlled in proportion to the size of the signal current.

3. When signal current is large (coil is excited, full power control) • When signal current flows to coil (9), coil (9) is excited. • The signal current at this point is the maximum, so the propulsion force of plunger (10) is also the maximum. • Because of this, spool (6) is pushed to the left in the direction of the arrow by push pin (8). • As a result, the maximum flow of pressurized oil from port P flows to port C and the circuit pressure between the EPC valve and the control valve becomes the maximum. At the same time, port T is closed and no oil flows to the tank.

10-6

D155AX-5

30 DISASSEMBLY AND ASSEMBLY REMOVAL AND INSTALLATION OF ROPS GUARD .................................................................................30-2

D155AX-5

30-1

DISASSEMBLY AND ASSEMBLY

REMOVAL AND INSTALLATION OF ROPS GUARD

REMOVAL AND INSTALLATION OF ROPS GUARD Removal 1. Remove clip (1) (installed in the operator's cab). 2. Pull antenna cable (2) out of hole h1. 3. Disconnect connector CN-GP9 at position P. 4. Remove clips (3). 5. Pull the antenna cable and rotary lamp wiring harness (4) out of hole h2. 6. Remove the ROPS according to the Shop manual for the standard model. Installation • Carry out installation in the reverse order to removal.

30-2

D155AX-5

90 OTHERS HYDRAULIC CIRCUIT DIAGRAM (FOR iBLADE SPECIFICATION)........................................................... 90- 3 EELECTRICAL CIRCUIT DIAGRAM (FOR iBLADE SPECIFICATION) ....................................................... 90- 5

D155AX-5

90-1

OTHERS

HYDRAULIC CIRCUIT DIAGRAM (FOR iBLADE SPECIFICATION)

HYDRAULIC CIRCUIT DIAGRAM (FOR iBLADE SPECIFICATION)

D155AX-5

90-3

OTHERS

ELECTRICAL CIRCUIT DIAGRAM (FOR iBLADE SPECIFICATION)

ELECTRICAL CIRCUIT DIAGRAM (FOR iBLADE SPECIFICATION)

D155AX-5

90-5