24. SERVICE PROCEDURE 24.2.3 CHECK TRACK TENSION The wear of pins and bushings on the undercarriage will vary with the working conditions and soil properties. It is thus necessary to continually inspect the track tension so as to maintain the stand- ard tension. Carry out 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 is 20 – 30 mm (0.8 – 1.2 in), the tension is standard. If the track tension is not at the standard value, adjust it in the following manner. ADJUSTMENT ¤ WARNING 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 the track tension is not relieved by this procedure, please contact your Komatsu distributor. 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 soil get in. 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. 5. Continue to pump in grease until S becomes 560 mm (22.1 in).
If the tension is still loose, the pin and bushing are excessively worn, so they must be either turned or replaced. Please contact your Komatsu distributor. 3-29