Check And Adjust Track Tension - Komatsu D475A-5E0 Operation & Maintenance Manual

SERVICE PROCEDURE

CHECK AND ADJUST TRACK TENSION

The wear of pins and bushings on the undercarriage will vary with the working conditions and types of soil. It is thus
necessary to continually inspect the track tension so as to maintain the standard tension.
Perform the check and adjustment under the same conditions as when operating (on jobsites where the track
becomes clogged with mud, measure with the track clogged with mud).
INSPECTION
Stop the machine on level ground (stop with the transmission in
FORWARD without applying the brake). Then place a straight bar
on the track shoes between the carrier roller and the idler as shown
in the figure, and measure the clearance between the bar and the
grouser at the midpoint. If the clearance (A) is 20 to 30 mm (0.79
to 1.18 in), the tension is standard.
If the track tension is not at the standard value, adjust it in the
following manner.
ADJUSTMENT
Grease inside the adjusting mechanism is under high pressure.
Grease coming from plug (4) under pressure can penetrate the body causing injury or death. For this reason, do not loosen plug
(4) more than one turn. Do not loosen any part other than plug (4). Furthermore, do not bring your face in front of the grease fitting.
If track tension is not relieved by this procedure, ask your Komatsu distributor for repairs.
WHEN INCREASING TENSION
1. First remove the bolt (1) and then remove the cover (2).
NOTICE
When removing cover (2), be careful not to let any dirt get inside.
There is a safety label stuck to the back of cover (2). Be careful not to
damage the safety label.
2. Pump in grease through the grease fitting (3) with a grease
pump.
3. To check that the correct tension has been achieved, move the
machine backwards and forwards.
4. Check the track tension again, and if the tension is not correct,
adjust it again.
4 - 30
WARNING
MAINTENANCE