Komatsu PC210-11, Operation & Maintenance Manual

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2.
If any looseness of the bolt is found, tighten it in order
shown in the figure.
Tightening torque: 490 ± 49 Nm {50 ± 5 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
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 10 to 30 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.
Grease fitting (2) forms one part with plug (1).
2.
To check if the tension is correct, run the engine at low
idle, move the machine slowly forward (by an amount
equal to the length of track on ground), then stop the ma-
chine.
3.
Check the track tension again, and if the tension is not cor-
rect, adjust it again.
4.
Grease can be pumped in until dimension (S) becomes
0 mm. If the track tension is still loose, the pins and bush-
ings are excessively worn. The pins and bushings must be
inverted or replaced. Ask your Komatsu distributor for re-
pair.
MAINTENANCE MAINTENANCE PROCEDURE
4-25