Komatsu PC20R-8 Shop Manual page 175

TESTING AND ADJUSTMENTS
3 - Disconnect the hoses (1) and (2) from the motor
and plug them to prevent entry of impurities. At-
tach provisional tubes to the motor to catch any
oil leakages.
4 - Start the engine, move the machine to a 15ë
slope, and stop the engine.
5 - Mark the position between revolving frame and
lower track-frame on the swing circle and for 15
minutes check whether or not the revolving frame
rotates.
. If the revolving frame rotates the drift is due to
either the safety valve or the control valve.
H To establish the cause of the drift, install a
new safety valve.
PC20R-8 PC27R-8
CONTROL OF HYDRAULIC DRIFTS -
ANALYSIS OF THE CAUSES OF A DRIFT
PC20R-8
PC27R-8
2
1
RKPA2530
1
2
RKPA2301
RKP05050
20-59