20 TESTING AND ADJUSTING
Table of judgment standard values
..........................................................
20- 2
Standard value table for electrical parts
.......................................................
20-14
Tools for testing, adjusting and troubleshooting
................................................
20-23
Measuringenginespeed
...................................................................
20-24
Measuring intake manifold pressure
.........................................................
20-25
Measuring intake air restriction
..............................................................
20-26
Measuring lubricating oil pressure
...........................................................
20-27
Measuring fuel (filter) inlet restriction
.........................................................
20-28
Measuring blowby pressure
................................................................
20-29
Measuring engine back pressure
............................................................
20-30
Measuringexhaustcolor
...................................................................
20-31
Measuring coolant temperature
.............................................................
20-32
Measuringvalveclearance
.................................................................
20-33
Checking and adjusting belt tension for air conditioner compressor
................................
20-34
Adjustingenginespeedsensor
..............................................................
20-35
Testing and adjusting governor motor lever stroke
..............................................
20-36
Testing clearance of swing circle bearing
.....................................................
20-37
Testing and adjusting track shoe tension
......................................................
20-38
Testing and adjusting hydraulic pressure in work equipment, swing, travel circuit
.....................
20-39
Testing and adjusting TVC valve output pressure (servo piston input pressure)
.......................
20-42
Testing and adjusting LS valve output pressure (servo pistion input pressure) and LS differential pressure . 20-44
Testing and adjusting control pump circuit oil pressure
..........................................
20-47
Testing EPC valve, solenoid valve output pressure
..............................................
20-49
Measuring PPC valve output pressure and testing PPC shuttle valve
...............................
20-51
Adjusting work equipment l Swing PPC valve
.................................................
20-53
Adjustingtravellever
......................................................................
20-54
Testing travel deviation
....................................................................
20-55
Testing location causing hydraulic drift of work equipment
........................................
20-56
Measuringoilleakage
.....................................................................
20-58
Releasing remaining pressure in hydraulic circuit
...............................................
20-59
Bleedingair .............................................................................
20-60
Troubleshooting ..........................................................................
20-63
A When carrying out testing, adjusting, or troubleshooting, park the machine on level ground and use the safety
pins and blocks to prevent the machine from moving.
A When carrying out work together with other workers, always use signals and do not let unauthorized people
near the machine.
A When checking the coolant level, always wait for the coolant to cool down.
If the radiator cap is removed when
the coolant is still hot, the coolant will spurt out and cause burns.
A Be careful not to get caught in the fan, fan belt, or other rotating parts.
20-I
a
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