PLATE-DRUM DRIVE 1405846 - Caterpillar

Personal injury or death can result from grease under pressure.Grease coming out of the relief valve under pressure can penetrate the body causing injury or death.Do not watch the relief valve to see if grease is escaping. Watch the track or track adjustment cylinder to see if the track is being loosened.Loosen the relief valve one turn only.If track does not loosen, close the relief valve and contact your Caterpillar dealer.
Keeping the track properly adjusted will increase the service life of the track and drive components.
Note: The track tension must be adjusted according to the current operating conditions. Keep the track as slack as possible if the soil is heavy.Measuring Track Tension
Operate the machine in the direction of the idlers.
Illustration 1 g01103855
Stop with one track pin directly over the front carrier roller. Park the machine and turn off the engine.
Illustration 2 g03472827
Place a straight edge on top of the track grousers between the front carrier roller and the idler. The straight edge should be long enough to reach from the front carrier roller to the idler.Note: If your machine is equipped with three carrier rollers, place a straight edge on the tracks between the carrier rollers. The straight edge should be long enough to reach from one carrier roller to another carrier roller.
Measure the maximum amount of sag in the track. The sag is measured from the highest point of the track grouser to the bottom of the straight edge. A track that is properly adjusted will have a sag of 40.0 to 55.0 mm (1.57 to 2.17 inch).
If the track is too tight, or if the track is too loose, adjust the track tension according to the appropriate procedure below.Adjusting Track Tension
Illustration 3 g00270405
Typical example
The track adjuster is located on the track frame.Tightening the Track
Illustration 4 g06221946
(1) Grease valveWipe the fitting before you add grease.
Add grease through grease valve (1) until the correct track tension is reached.
Operate the machine back and forth in order to equalize the pressure.
Check the amount of sag. Adjust the track, as needed.Loosening the Track
Illustration 5 g06221946
(1) Grease valve
Loosen grease valve (1) carefully until the track begins to loosen. One turn should be the maximum.
Tighten grease valve (1) to 34 5 N m (25 4 lb ft) when the desired track tension is reached.
Operate the machine back and forth in order to equalize the pressure.
Check the amount of sag. Adjust the track, as needed.