Komatsu PC490-11, Инструкция по установке и эксплуатации

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METHOD FOR CHECKING LOOSENESS AND TIGHTENING TRACK SHOE
BOLTS
NOTICE
If the machine is used with track shoe bolts loose, they will break. If any looseness of the shoe bolt is
found, retighten it.
1.
Check for looseness of the shoe bolt (1).
2.
If any looseness of the bolt is found, tighten it in order
shown in the figure.
Tightening torque: 392 ± 39 Nm {40 ± 4 kgm}
3.
Check that the nut and shoe are in close contact with the
link contact surface.
4.
After checking, tighten a further 120 ± 10 °.
METHOD FOR CHECKING AND ADJUSTING TRACK TENSION
The wearing of the pins and bushings in the undercarriage depends on the working condition and type of soil.
Check the track tension occasionally and keep it in the standard range.
For performing the inspection and adjustment of the track shoes, park the machine on the level and solid
ground.
METHOD FOR CHECKING TRACK TENSION
1.
Run the engine at low idle, then move the machine forward for a distance equal to the track length on
ground, and slowly stop the machine.
2.
Place straight wooden square bar (3) which reaches from
idler (1) to carrier roller (2) on the track.
3.
Measure the maximum deflection (a) between the bottom
surface of the wooden bar and top surface of the track
shoes.
Standard deflection
Deflection "a" should be 16 to 34 mm.
If the deflection is out of the standard value range, adjust it into the standard value range.
METHOD FOR INCREASING TRACK TENSION
Items to be prepared
Grease pump
1.
Pump in grease through grease fitting (2) by using a grease pump.
MAINTENANCE PROCEDURE MAINTENANCE
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