Komatsu PC20R-8 Shop Manual page 172

TESTING AND ADJUSTMENTS
3. Bucket test
1 - Position the machine with the arm vertical and
the bucket resting on the ground in a horizontal
position. Put a weight in the bucket, or fill it with
earth.
2 - Stop the engine and release the residual hydrau-
lic pressures.
3 - Disconnect the bucket cylinder hoses (1) and (2)
and plug them to prevent the entry of impurities.
4 - Plug the hole of the bucket cylinder on the base
side and attach a provisional tube on the head
side to catch any oil leakages.
5 - Start the engine and raise the boom.
6 - Stop the engine and check the position of the
bucket for 15 minutes.
If the bucket makes an opening movement the
.
drift is due to the cylinder gaskets.
If the bucket does not move, the drift is due to
.
the control valve.
20-56
CONTROL OF HYDRAULIC DRIFTS -
ANALYSIS OF THE CAUSES OF A DRIFT
1
50 cm
RKP05020
2
RKPA2490
RKP05030
PC20R-8 PC27R-8