Komatsu F30791, Shop Manual

Page: 128 / 298

Machine model PC20R-8
Classifi-
cation
Check item Test condition Unit
Standard
value
Permissible
value
Hydraulic drift of
travel motors
Measuring posture
.
Engine stopped.
.
Hydraulic oil temperature: 45 ± 55ëC.
.
Machine parked on sloping ground.
.
Measure the drift after 5 minutes
mm Max. 200 Max. 240
Leakage of travel motor
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
Lock shoe
,
/min
Ð Ð
Total work equipment
(Downward movement
of tips of bucket teeth)
Measuring posture
.
Bucket: rated load:
PC20R-8: 126 kg
PC27R-8: 135 kg
.
In this position, measure ex-
tension or retraction of each
cylinder, and any leakages oc-
curring when a load is applied
to the tips of the bucket teeth.
.
Horizontal and level ground
.
Levers: neutral
.
Engine: switched off
.
Oil temperature: 45 ± 55ëC.
.
Take measurements as soon
as the engine stops.
.
Measure the variations every 5
minutes and check the total
variation after 15 mins.
Short arm
mm
Max. 300 Max. 340
Long arm
Max. 300 Max. 350
Boom cylinder
(Retraction)
Short arm Max. 20 Max. 30
Long arm
Max. 20 Max. 33
Arm cylinder
(Extension)
Short arm
Max. 20 Max. 30
Long arm Max. 20 Max. 33
Bucket cylinder
(Retraction)
Max. 10 Max. 20
Boom swing
.
Bucket: rated load:
PC20R-8: 126 kg
PC27R-8: 135 kg
.
Engine stopped.
.
Hydraulic oil temp.: 45 ± 55ëC
.
In the same position as above,
stop the machine on a 15ë
slope and position the revol-
ving frame at 135ë. Measure
the extension and retraction of
the cylinder after 15 minutes.
Short arm
mm
Max. 15 Max. 20
Long arm
Max. 15 Max. 22
. FOR THE MACHINE
20-12
PC20R-8 PC27R-8
Travel
Hydraulic
drift
of
working
equipment
RKP01990
135
°
15
°
RKP01860
RKP02000
30
°