Related Manuals for Komatsu PC128US-8
Summary of Contents for Komatsu PC128US-8
- Page 1 WEN00003-00 PC128US HYDRAULIC EXCAVATOR 20001 and up SERIAL NUMBERS Arm crane cannot be used on this machine.
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- Page 3 HYDRAULIC EXCAVATOR 1SHOP MANUAL PC128US-8 Machine model Serial number PC128US-8 20001 and up 00 Index and foreword PC128US-8 00-1 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 4 Hydraulic tank and filter ........................10-28 Hydraulic pump..........................10-30 Control valve........................... 10-56 CLSS .............................. 10-68 Functions and operation by valve....................10-72 PPC valve............................10-102 Swing motor............................ 10-119 Travel motor ........................... 10-127 00-2 PC128US-8 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 5 Testing PPC valve output pressure....................30-41 Adjusting play of work equipment and swing PPC valves.............. 30-43 Checking parts which cause hydraulic drift of work equipment............30-44 Testing and adjusting travel deviation .................... 30-46 PC128US-8 00-3 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 6 Failure code [CA272] IMV/PCV1 open error .................. 40-95 Failure code [CA322] Injector #1 (L #1) system open/short error........... 40-96 Failure code [CA324] Injector #3 (L #3) system open/short error........... 40-98 00-4 PC128US-8 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 7 Failure code [DXE4KA] Service current EPC discon ..............40-184 Failure code [DXE4KB] Service current EPC short................ 40-185 Failure code [DY20KA] Wiper working abnormality ............... 40-186 Failure code [DY20MA] Wiper parking abnormality ............... 40-188 PC128US-8 00-5 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 8 H-18 Travel speed does not change or it is kept low or high............40-282 H-19 Track does not move (Only either side)................. 40-282 H-20 Machine does not swing ......................40-283 00-6 PC128US-8 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 9 Spreading and installation of track shoe assembly ................ 50-102 Removal and installation of sprocket....................50-104 Removal and installation of revolving frame assembly ..............50-105 Removal and installation of counterweight assembly (Machine without add-on weight)....50-107 PC128US-8 00-7 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 10 Hydraulic circuit diagram ........................ 90-5 Electrical diagrams and drawings ...................... 90-9 Symbols used in electric circuit diagrams..................90-9 Electrical circuit diagram ........................ 90-13 Connectors table and arrangement drawing .................. 90-25 Index ..............................00-8 PC128US-8 Find manuals at https://best-manuals.com Find manuals at https://best-manuals.com...
- Page 11 Proper service and repair are extremely important for safe machine operation. The service and repair techniques recommended by Komatsu and described in this manual are both effective and safe. Some of these techniques require the use of tools specially designed by Komatsu for the specific purpose. To prevent injury to workers, the symbol is used to mark safety precautions in this manual.
- Page 12 Operate the hoist or crane slowly to prevent the component from hitting any other part. Do not work with any part still raised by the hoist or crane. 00-10 PC128US-8...
- Page 13 If you grasp them, your fingers as large as 39.2 kN {4,000 kg}. may be caught. After the wire ropes are stretched, stop the crane and check the condi- tion of the slung load, wire ropes, and pads. PC128US-8 00-11...
- Page 14 11) After operating the hoist, do not swing the control switch. 12) Remember the position of the main switch so that you can turn off the power immedi- ately in an emergency. 00-12 PC128US-8...
- Page 15 When connecting the refrigerant pip- ing, apply compressor oil for refriger- ant (R134a) (DENSO: ND-OIL8, VA L E O T H E R M A L S Y S T E M S : ZXL100PG (equivalent to PAG46)) to its O-rings. PC128US-8 00-13...
- Page 16 Engine volume This section explains the method of reproducing, repairing, and replacing parts. Revision and distribution Any additions, revisions, or other change of notices will be sent to KOMATSU distributors. Get the most up-to-date information before you start any work. 00-14...
- Page 17 Places where oil, etc. must be drained, and quantity to be drained. Units In this shop manual, the units are indicated with International System of units (SI). For reference, con- ventionally used Gravitational System of units is indicated in parentheses { }. PC128US-8 00-15...
- Page 18 The tightness of fit is decided by the toler- ance. Indication of size of rotating shaft and hole and relationship drawing of them Example: Tolerance Standard size Shaft Hole –0.030 +0.046 –0.076 00-16 PC128US-8...
- Page 19 If a product is worn to the allowable value, it must be checked or repaired. Since the permissible value is estimated from vari- ous tests or experiences in most cases, however, it must be judged after consider- ing the operating condition and customer's requirement. PC128US-8 00-17...
- Page 20 The pins of the male and female connec- tors are in contact at the crimped terminal or soldered portion, but if there is exces- sive force brought to bear on the wiring, the plating at the joint will peel and cause improper connection or breakage. 00-18 PC128US-8...
- Page 21 If there is oil or water in the com- pressed air, the contacts will become even dirtier, so remove the oil and water from the compressed air com- pletely before cleaning with com- pressed air. PC128US-8 00-19...
- Page 22 If the machine is left disassem- bled for a long time, it is particu- larly easy for improper contact to occur, so always cover the con- nector. 00-20 PC128US-8...
- Page 23 If the connector cannot be cor- rected easily, remove the clamp and adjust the position. If the connector clamp has been removed, be sure to return it to its original position. Check also that there are no loose clamps. PC128US-8 00-21...
- Page 24 (2) while moving it up and down until the locks are set normally. Arrow: 1), 2), 3) a Right of figure: Lock (a) is pulled down (not set completely) and lock (b) is set completely. (1): Male connector (2): Female connector (a), (b): Locks 00-22 PC128US-8...
- Page 25 After completely drying the con- n e c t o r, b l o w i t w i t h c o n ta c t restorer and reassemble. PC128US-8 00-23...
- Page 26 If there is any change, there is proba- bly defective contact in that circuit. 00-24 PC128US-8...
- Page 27 If an oil clean- ing device is used, it is possible to filter out the dirt that has collected during storage, so this is an even more effective method. PC128US-8 00-25...
- Page 28 The oil cleaning equipment is used to remove the ultra fine (about 3 ) particles that the filter built in the hydraulic equipment can- not remove, so it is an extremely effective device. 00-26 PC128US-8...
- Page 29 Even if lock (L2) is pressed, connec- tor (1) cannot be pulled out toward you, if part A does not float. In this case, float part A with a small screw- driver while press lock (L2), and then pull out connector (1) toward you. PC128US-8 00-27...
- Page 30 If the lock is on the underside, use flat-head screwdriver [1] since you cannot insert your fingers. While pressing up lock (C) of the connec- tor with flat-head screwdriver [1], pull out connector (3) in the direction of the arrow. 00-28 PC128US-8...
- Page 31 Insert the connector to the end, while setting its groove. Turn housing (H1) in the direction of the arrow until it “clicks”. Example) Speed sensor of fuel supply pump: G (SUMITOMO-3) a Pull the connector straight up. PC128US-8 00-29...
- Page 32 (Nominal No. 3 and below) Insulator Soft polyvinyl chloride automobile Conduc- Annealed copper for elec- Heat-resis- General wiring in extremely tric appliance tant low-volt- –50 to +110 cold district, wiring at high-tem- age wire for Heat-resistant crosslinked perature place Insulator automobile polyethylene 00-30 PC128US-8...
- Page 33 (approx.) 10.4 12.0 13.6 Standard – – – – – – – – – Cov- Standard 10.8 11.4 13.0 13.6 16.0 17.6 er D Standard 10.8 11.4 13.0 13.6 16.0 17.6 “f” of nominal No. denotes flexible”. PC128US-8 00-31...
- Page 34 – – Others – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 00-32 PC128US-8...
- Page 35 07371-30400 07379-00500 07378-10500 07371-30500 If the part is not under hydraulic pressure, the following corks can be used. Dimensions Nominal Part Number number 07049-00608 07049-00811 07049-01012 07049-01215 07049-01418 11.5 07049-01620 13.5 07049-01822 07049-02025 07049-02228 18.5 07049-02430 07049-02734 22.5 PC128US-8 00-33...
- Page 36 If any part is loosened or damaged, retighten or repair it. Fuel system Check the piping for damage, the mounting bolts and nuts for looseness, and the joints for fuel leakage. If any part is loosened or damaged, retighten or repair it. 00-34 PC128US-8...
- Page 37 If any bolt or nut is loosened, retighten it. Checking muffler function Check the muffler for abnormal sound and sound different from that of a new muffler. If any abnormal sound is heard, repair the muffler, referring to “Troubleshooting” and “Disassembly and assembly”. PC128US-8 00-35...
- Page 38 After inserting the hose in the mating adapter perfectly, pull it back to check its connecting condition. (Fig. 5) a When the hose is pulled back, the rubber cap portion moves toward the hose about 3.5 mm. This does not indicate abnormality, however. 00-36 PC128US-8...
- Page 39 2), pull out whole body (7) to discon- nect it. (Fig. 8) Connection Hold the tightening portion and push body (7) straight until sliding prevention ring (6) contacts contact surface (a) of the hexag- onal portion at the male end. (Fig. 9) PC128US-8 00-37...
- Page 40 2), pull out whole body (9) to discon- nect it. (Fig. 12) Connection Hold the tightening portion and push body (9) straight until the sliding prevention ring contacts contact surface (b) of the hexag- onal portion at the male end. (Fig. 13) 00-38 PC128US-8...
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