Komatsu PC750SE-6K Hydraulic Excavator Index:

1. Foreword ………………………………………………………………………………………………………………………… 0-1
2. Safety information……………………………………………………………………………………………………………. 0-2
3. Introduction …………………………………………………………………………………………………………………….. 0-4
4. Location of plates, table to enter serial No. and distributor ……………………………………………….. 0-5
SAFETY
6. General Precautions ………………………………………………………………………………………………………… 1-2
7. Precautions during operation …………………………………………………………………………………………… 1-8
7.1 Before starting engine ……………………………………………………………………………………………… 1-9
7.2 Operating machine ……………………………………………………………………………………………….. 1-10
7.3 Transportation ………………………………………………………………………………………………………. 1-18
7.4 Battery ………………………………………………………………………………………………………………… 1-19
7.5 Towing …………………………………………………………………………………………………………………. 1-21
7.6 Lifting operations ………………………………………………………………………………………………….. 1-21
8. Precautions for maintenance ………………………………………………………………………………………….. 1-22
8.1 Before carrying out maintenance …………………………………………………………………………….. 1-22
8.2 During maintenance………………………………………………………………………………………………. 1-26
9. Position for attaching safety labels …………………………………………………………………………………. 1-31
OPERATION
10. General view
10.1 General view of machine …………………………………………………………………………………………. 2-2
10.2 General view of controls and gauges ………………………………………………………………………… 2-3
11. Explanation of components
11.1 Machine monitor …………………………………………………………………………………………………….. 2-4
11.2 Switches ……………………………………………………………………………………………………………… 2-15
11.3 Control levers, pedals ……………………………………………………………………………………………. 2-20
11.4 Ceiling window ……………………………………………………………………………………………………… 2-23
11.5 Front window ……………………………………………………………………………………………………….. 2-24
11.6 Door lock ……………………………………………………………………………………………………………… 2-26
11.7 Cap, cover with lock………………………………………………………………………………………………. 2-27
11.8 Luggage box ………………………………………………………………………………………………………… 2-28
11.9 Ashtray………………………………………………………………………………………………………………… 2-28
11.11 Air conditioner / Heater ………………………………………………………………………………………….. 2-29
11.12 Car radio ……………………………………………………………………………………………………………… 2-32
11.14 Fuse ……………………………………………………………………………………………………………………. 2-33
11.15 Fusible link …………………………………………………………………………………………………………… 2-34
11.16 Controllers …………………………………………………………………………………………………………… 2-34
11.17 Tool box ………………………………………………………………………………………………………………. 2-34
11.18 Handling grease pump…………………………………………………………………………………………… 2-34
11.19 Handling the accumulator ………………………………………………………………………………………. 2

12. Operation
12.1 Check before starting engine …………………………………………………………………………………… 2-39
12.2 Starting engine ………………………………………………………………………………………………………. 2-49
12.3 Operations and checks after starting engine ……………………………………………………………… 2-52
12.4 Moving machine off ………………………………………………………………………………………………… 2-58
12.5 Steering machine …………………………………………………………………………………………………… 2-61
12.6 Stopping machine ………………………………………………………………………………………………….. 2-63
12.7 Swinging ………………………………………………………………………………………………………………. 2-64
12.8 Operation of work equipment …………………………………………………………………………………… 2-65
12.9 Working mode selection …………………………………………………………………………………………. 2-66
12.10 Prohibitions for operation ………………………………………………………………………………………… 2-67
12.11 Precaution for operation …………………………………………………………………………………………. 2-69
12.12 Precaution when travelling up or down hills ……………………………………………………………….. 2-70
12.13 How to escape from mud ………………………………………………………………………………………… 2-72
12.14 Work possible using hydraulic excavator …………………………………………………………………… 2-73
12.15 Replacement of bucket …………………………………………………………………………………………… 2-74
12.16 Parking the machine ………………………………………………………………………………………………. 2-75
12.17 Check after finishing work ……………………………………………………………………………………….. 2-76
12.18 Stopping engine …………………………………………………………………………………………………….. 2-77
12.19 Check after stopping engine ……………………………………………………………………………………. 2-78
12.20 Locking ………………………………………………………………………………………………………………… 2-78
13. Transportation
13.1 Loading, unloading work …………………………………………………………………………………………. 2-79
13.2 Precautions for loading …………………………………………………………………………………………… 2-81
13.3 Precautions for transportation ………………………………………………………………………………….. 2-81
13.4 Transportation posture ……………………………………………………………………………………………. 2-82
13.5 Increase / Decrease track frame gauge …………………………………………………………………….. 2-87
14. Cold weather operation
14.1 Precaution for low temperature ………………………………………………………………………………… 2-89
14.2 Precautions after completion of work ………………………………………………………………………… 2-91
14.3 After cold weather ………………………………………………………………………………………………….. 2-91
15. Long-term storage
15.1 Before storage ………………………………………………………………………………………………………. 2-92
15.2 During storage ………………………………………………………………………………………………………. 2-93
15.3 After storage …………………………………………………………………………………………………………. 2-93
15.4 Starting machine after long-term storage ………………………………………………………………….. 2-93
16. Troubleshooting
16.1 Phenomena that are not failures ………………………………………………………………………………. 2-94
16.2 Method of towing machine ………………………………………………………………………………………. 2-94
16.3 Precautions on particular jobsites …………………………………………………………………………….. 2-94
16.4 If battery is discharged ……………………………………………………………………………………………. 2-95
16.5 Other trouble …………………………………………………………………………………………………………. 2-99
5. CONTENTS
0-9 PC750-ENG
MAINTENANCE
17. Guides to maintenance ……………………………………………………………………………………………………. 3-2
18. Outlines of service …………………………………………………………………………………………………………… 3-5
18.1 Outline of oil, fuel, coolant ………………………………………………………………………………………… 3-5
18.2 Outline of electric system ………………………………………………………………………………………….. 3-8
18.3 Outline of hydraulic system ……………………………………………………………………………………….. 3-9
18.4 Releasing, pressure ……………………………………………………………………………………………….. 3-10
18.5 Bleeding air from circuit ………………………………………………………………………………………….. 3-11
19. Wear parts list ……………………………………………………………………………………………………………….. 3-14
20. Use of fuel, coolant and lubricants according to ambient temperature …………………………….. 3-15
21. Standard tightening torques for bolts and nuts ……………………………………………………………….. 3-19
21.1 Introduction of necessary tools ………………………………………………………………………………… 3-19
21.2 Torque list …………………………………………………………………………………………………………….. 3-20
22. Periodic replacement of safety critical parts …………………………………………………………………… 3-21
23. Maintenance schedule chart …………………………………………………………………………………………… 3-26
23.1 Maintenance schedule chart ……………………………………………………………………………………. 3-26
24. Service procedure ………………………………………………………………………………………………………….. 3-30
24.1 Initial 100 hours service ………………………………………………………………………………………….. 3-30
24.2 Initial 250 hours service ………………………………………………………………………………………….. 3-30
24.3 When required ………………………………………………………………………………………………………. 3-31
24.4 Check before starting ……………………………………………………………………………………………… 3-47
24.5 Every 10 hours service …………………………………………………………………………………………… 3-52
24.6 Every 100 hours service …………………………………………………………………………………………. 3-55
24.7 Every 250 hours service …………………………………………………………………………………………. 3-56
24.8 Every 500 hours service …………………………………………………………………………………………. 3-65
24.9 Every 1000 hours service ……………………………………………………………………………………….. 3-74
24.10 Every 2000 hours service ……………………………………………………………………………………….. 3-79
24.11 Every 4000 hours service ……………………………………………………………………………………….. 3-82
SPECIFICATIONS
25. Specifications………………………………………………………………………………………………………………….. 4-2
OPTIONS AND ATTACHMENTS
26. General Precautions ………………………………………………………………………………………………………… 5-2
26.1 Precautions related to safety …………………………………………………………………………………….. 5-2
26.2 Precautions when installing attachments …………………………………………………………………….. 5-3
27. Seat belt ………………………………………………………………………………………………………………………….. 5-4
27.1 Using seat belt ………………………………………………………………………………………………………… 5-4
28. Introduction of optional parts, attachments ………………………………………………………………………. 5-6
28.1 Combinations of work equipment ………………………………………………………………………………. 5-6
28.2 Selection of track shoes ……………………………………………………………………………………………. 5-8