Komatsu F30791, Shop Manual

Page: 126 / 298

Machine model PC20R-8
Classifi-
cation
Check item Test condition Unit
Standard
value
Permissible
value
Internal leakage from
swing motor
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
Swing lock: engaged
.
Measure the leakage
.
Pressurize circuit.
,
/min
0.6 Max. 1.0
Travel motor swing
speed (1)
(no-load)
Measuring posture
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
Rest the bucket on the ground,
raise one track-shoe, rotate one
turn, then measure time taken for
next.
sec
25.0 21 ± 29
13.0 11 ± 15
Travel speed (2)
Measuring posture
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
On flat ground
.
Travel for at least 10 metres and
then check on the time needed to
cover 20 metres
sec
33.0 29 ± 37
16.5 14 ± 19
Travel deviation
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
Travel 20 metres on flat ground and mea-
sure the deviation.
H
The surface must be firm and horizontal.
H
Measure dimension «X»
mm Max. 500 Max. 550
. FOR THE MACHINE
20-10
PC20R-8 PC27R-8
Swing
Low
speed
High
speed
Low
speed
High
spe
ed
Travel
10m
20m
X
RKP01830
RKP01950
RKP01850
45
°
RKP01850
45
°