Komatsu D32E-1 Operation & Maintenance Manual page 129

24.
SERVICE PROCEDURE
24.2.3 TRACK TENSION
AND ADJUSTMENT
24.2.3.1 PROPER ADJUSTMENT
Tracks adjusted too tightly increase operating loads on final drives and
accelerate wear on undercarriage components, especially in packing conditions.
A machine in forward operation with correctly adjusted tracks will experience
track loads only along the ground from the front idler to where the bushings
engage the sprocket.
Lubricated track systems are to be adjusted to provide a sag in the track chain
between to front top idler and the front idler. Correct tension reduces stress
levels throughout the undercarriage system.
24.2.3.2 CHECKING THE TENSION
Place a wooden block, = 305 mm (12 in) in height, under the front most
track shoe lug. Drive the machine forward until the track chain is tight along
the ground and around the sprocket. Apply and lock the brake pedal, lock
the transmission shift lever in the NEUTRAL position and stop the engine.
Stand on the track between the front idler and the first track idler in order to
accumulate all the chain slack at this point.
Place a straightedge on the track so the
ends
rest over the front idler and
track idler. Measure the clearance between the bottom of the straightedge
and the top of the shoe grouser with a ruler at the midway point between the
idlers.
REMARK
If the distance is more than
adjust the track tension.
24.2.3.3 ADJUSTING TENSION
64 mm (2-X in) or less than 50 mm (2 in),
The track chains are adjusted by hydraulic pressure. When lubricant is
introduced into the front idler fork through the lubrication fitting, it acts upon the
piston within the front idler fork forcing the front idler fork and front idler forward
for track adjustment.
A
WARNING
To avoid possible injury, always stand to the side of the bleeder plug
when making track adjustment. The pressure in the front idler fork is
held by the bleeder plug and check valve. A loose or improper thread fit
of either of these parts can allow them to be ejected by the pressure of
the lubricant, causing possible injury. When increasing track tension,
be sure the bleeder plug and check valve are properly torqued. When
relieving track tension, never loosen the bleeder plug and check valve
more than 2 % turns. Before adding lubricant for track adjustment, be
sure the ball check and relief valve are properly torqued.
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