20 TESTING, ADJUSTING AND TROUBLESHOOTING
12 of judgement standard value ......................................................................................................................................... 20-2
Table
Standard value table for electrical system............................................................................................................................. 20-18
Tool for testing, adjusting, and troubleshooting ................................................................................................................... 20-20
Adjusting valve clearance ..................................................................................................................................................... 20-21
Measuring compression pressure .......................................................................................................................................... 20-23
Adjusting fuel injection timing ............................................................................................................................................. 20-24
Measuring engine oil pressure............................................................................................................................................ 20-24-1
Adjusting fuel control lever................................................................................................................................................... 20-25
Testing and adjusting hydraulic pressure in work equipment, swing, travel circuit ............................................................. 20-26
Testing control circuit pressure ............................................................................................................................................. 20-29
Measuring output pressure of PPC valve .............................................................................................................................. 20-30
Adjusting PPC valve ............................................................................................................................................................. 20-31
Measuring solenoid valve outlet port pressure...................................................................................................................... 20-32
Adjusting blade control lever ................................................................................................................................................ 20-33
Measuring internal leakage of cylinder ................................................................................................................................. 20-34
Bleeding air from hydraulic circuit ....................................................................................................................................... 20-35
Releasing remaining pressure from hydraulic circuit ........................................................................................................... 20-37
Testing hydraulic breaker gas pressure ................................................................................................................................. 20-38
Troubleshooting .................................................................................................................................................................... 20-39
★ The following precautions are necessary when using the standard value tables for testing and adjusting or for troubleshooting.
1.
The values in the tables are for new machines and are obtained from reference to values when the machine is shipped from
the factory. These values should be used only as a target guide for judging the progress of wear or when repairing the machine.
2.
The standard values for judging failures are based on the results of various tests when shipping the machine from the factory. These values should be used as reference together with the repair condition and operating record of the machine to
make judgement on failures.
3.
These standard values do not form a basis for judging claims.
WARNING! Before performing inspection, adjustment or faultfinding, park the machine on level ground and
check the safety pin and chock.
WARNING! When performing joint work, make appropriate signals and allow only authorized personnel near
the machine.
WARNING! When checking the water level, allow the engine to cool down before removing the radiator cap to
prevent the risk of being scalded by hot water which may spurt out if engine is hot.
WARNING! Take great care to avoid getting caught in rotating parts such as the fan, etc.
PC25-1 PC30-7 PC40-7 PC45-1
20-1 7
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