Komatsu PC340LC-6K, PC340NLC-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 …………………………………………………………………………………………………… 1-8
7.2 Operating machine ……………………………………………………………………………………………………… 1-10
7.3 Transportation ……………………………………………………………………………………………………………. 1-15
7.4 Battery ………………………………………………………………………………………………………………………. 1-17
7.5 Towing ………………………………………………………………………………………………………………………. 1-19
7.6 Bucket with hook ………………………………………………………………………………………………………… 1-20
8. Precautions for maintenance ……………………………………………………………………………………………… 1-23
8.1 Before carrying out maintenance ………………………………………………………………………………….. 1-23
8.2 During maintenance ……………………………………………………………………………………………………. 1-28
9. Position for attaching safety labels ……………………………………………………………………………………… 1-34
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 ………………………………………………………………………………………………. 2-19
11.4 Roof hatch ……………………………………………………………………………………………………………… 2-24
11.5 Front window ………………………………………………………………………………………………………….. 2-25
11.6 Door lock ……………………………………………………………………………………………………………….. 2-27
11.7 Cap, cover with lock…………………………………………………………………………………………………. 2-28
11.8 Luggage box…………………………………………………………………………………………………………… 2-29
11.9 Ashtray ………………………………………………………………………………………………………………….. 2-29
11.10 Air conditioner …………………………………………………………………………………………………………. 2-30
11.11 Car radio ………………………………………………………………………………………………………………… 2-33
11.12 Fuse ……………………………………………………………………………………………………………………… 2-34
11.13 Fusible link……………………………………………………………………………………………………………… 2-35
11.14 Controllers ……………………………………………………………………………………………………………… 2-35
11.15 Tool box …………………………………………………………………………………………………………………. 2-35
11.16 Refuelling pump………………………………………………………………………………………………………. 2-35
11.17 Handling the accumulator …………………………………………………………………………………………. 2-36

12. Operation
12.1 Check before starting engine ……………………………………………………………………………………… 2-38
12.2 Starting engine ………………………………………………………………………………………………………… 2-48
12.3 Operations and checks after starting engine …………………………………………………………………2-51
12.4 Moving machine off ………………………………………………………………………………………………….. 2-57
12.5 Steering machine …………………………………………………………………………………………………….. 2-60
12.6 Stopping machine…………………………………………………………………………………………………….. 2-62
12.7 Swinging …………………………………………………………………………………………………………………. 2-63
12.8 Operation of work equipment …………………………………………………………………………………….. 2-64
12.9 Handling active mode ……………………………………………………………………………………………….. 2-65
12.10 Working mode selection …………………………………………………………………………………………… 2-66
12.11 Prohibitions for operation ………………………………………………………………………………………….. 2-68
12.12 Precaution for operation …………………………………………………………………………………………… 2-70
12.13 Precaution when travelling up or down hills …………………………………………………………………2-71
12.14 How to escape from mud …………………………………………………………………………………………. 2-73
12.15 Work possible using hydraulic excavator …………………………………………………………………….2-74
12.16 Replacement and inversion of bucket …………………………………………………………………………2-75
12.17 Parking the machine………………………………………………………………………………………………… 2-77
12.18 Check after finishing work ………………………………………………………………………………………… 2-78
12.19 Stopping engine ……………………………………………………………………………………………………… 2-79
12.20 Check after stopping engine ……………………………………………………………………………………… 2-80
12.21 Locking ………………………………………………………………………………………………………………….. 2-80
12.22 Overload warning device ………………………………………………………………………………………….. 2-80
13 Transportation
13.1 Loading, unloading work …………………………………………………………………………………………… 2-81
13.2 Precautions for loading ……………………………………………………………………………………………… 2-83
13.3 Precautions for transportation ……………………………………………………………………………………. 2-84
13.4 Lifting the machine …………………………………………………………………………………………………… 2-84
14. Cold weather operation
14.1 Precaution for low temperature ………………………………………………………………………………….. 2-86
14.2 Precautions after completion of work ………………………………………………………………………….. 2-87
14.3 After cold weather…………………………………………………………………………………………………….. 2-87
15. Long-term storage
15.1 Before storage …………………………………………………………………………………………………………. 2-88
15.2 During storage …………………………………………………………………………………………………………. 2-89
15.3 After storage ……………………………………………………………………………………………………………. 2-89
15.4 Starting machine after long-term storage ……………………………………………………………………..2-89
16. Troubleshooting
16.1 Phenomena that are not failures ………………………………………………………………………………… 2-90
16.2 Method of towing machine ………………………………………………………………………………………… 2-90
16.3 Using method for light-weight towing hole …………………………………………………………………….2-90
16.4 Precautions on particular jobsites ……………………………………………………………………………….. 2-91
16.5 If battery is discharged ……………………………………………………………………………………………… 2-91
16.6 Other trouble …………………………………………………………………………………………………………… 2-95
5. CONTENTS
0-9 PC340-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 …………………………………………………………………………………………… 3-9
18.3 Outline of hydraulic system ………………………………………………………………………………………. 3-10
19. Wear parts list …………………………………………………………………………………………………………………. 3-11
20. Use of fuel, coolant and lubricants according to ambient temperature …………………………………….. 3-13
21. Standard tightening torques for bolts and nuts ……………………………………………………………………… 3-17
21.1 Introduction of necessary tools …………………………………………………………………………………… 3-17
21.2 Torque list ……………………………………………………………………………………………………………….. 3-18
22. Periodic replacement of safety critical parts …………………………………………………………………………. 3-19
23. Maintenance schedule chart ……………………………………………………………………………………………… 3-21
23.1 Maintenance schedule chart ……………………………………………………………………………………… 3-21
23.2 Maintenance interval when using hydraulic breaker ……………………………………………………….3-23
24. Service procedure ……………………………………………………………………………………………………………. 3-24
24.1 Initial 250 hours service …………………………………………………………………………………………….. 3-24
24.2 When required …………………………………………………………………………………………………………. 3-25
24.3 Check before starting ……………………………………………………………………………………………….. 3-47
24.4 Every 50 hours service ……………………………………………………………………………………………… 3-51
24.5 Every 100 hours service ……………………………………………………………………………………………. 3-53
24.6 Every 250 hours service ……………………………………………………………………………………………. 3-56
24.7 Every 500 hours service ……………………………………………………………………………………………. 3-63
24.8 Every 1000 hours service ………………………………………………………………………………………….. 3-71
24.9 Every 2000 hours service ………………………………………………………………………………………….. 3-74
24.10 Every 4000 hours ……………………………………………………………………………………………………. 3-81
SPECIFICATIONS
25. SPECIFICATIONS ……………………………………………………………………………………………………………… 4-2
25.1 Machine specifications ……………………………………………………………………………………………….. 4-2
25.2 Explanation of lifting capacity chart ………………………………………………………………………………. 4-5