Komatsu Utility PC12R-8 MISTRAL, Shop Manual

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CHECKING THE ENGINE SPEED
20-25
TESTING AND ADJUSTMENTS CHECKING THE ENGINE SPEED
When checking the engine rpm , always be very ca-
reful not to touch parts that reach high temperatures
and not to get entangled in rotating elements.
H Check the engine speed after the following conditions
have been reached:
.
Temperature of engine cooling water: 68 ± 80 ëC.
. Temperature of hydraulic oil: 45 ± 55 ëC.
1 - Mount and connect the tachometer C1 .
H If the stroboscopic tachometer C2 is used, make a
distinct mark on the engine pulley to facilitate the
reading.
2 - Start the engine and check:
.
Low idling without load (accelerator lever in "mini-
mum" position).
.
High idling without load (accelerator lever in "ma-
ximum" position).
H Low idling: PC12R ± PC15R: 1350 50 rpm
H High idling: PC12R: 2600 w 50 rpm
PC15R: 2775 w 50 rpm
H If the minimum and maximum speeds do not fall
within permissible limits when the engine is wi-
thout load, check the position locks of the accele-
rator lever, and the sheathing of the accelerator
well, before carrying out any tests under load.
(See «ADJUSTMENT OF THE ACCELERATOR
LEVER»).
.
Engine rpm with the pumps under load.
H Max. speed with pump P1 under load:
PC12R: 2550 w 50 rpm
PC15R: 2625 w 50 rpm
H Max. speed with pumps P1 and P2 under load:
PC12R: 2400 w 50 rpm
H If engine efficiency does not fall within permissi-
ble limits, have the engine checked by an autho-
rised workshop.
PC12R-8 PC15R-8
RKPA2020
C
1
RKPB6040
MIN MAX