Komatsu F30791, Shop Manual

Page: 122 / 298

Machine model PC20R-8
Classifi-
cation
Check item Test condition Unit
Standard
value
Permissible
value
Boom lever
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
Instrument coupling at centre
of control lever knob
.
Instrument coupling on outside
edge (for pedal control)
.
Reading at end of travel
kg
2.0 1.7 ± 2.3
Arm lever 2.0 1.7 ± 2.3
Bucket lever 2.0 1.7 ± 2.3
Swing lever 2.0 1.7 ± 2.3
Boom swing pedal 8.0 7.0 ± 9.0
Blade lever 3.0 2.5 ± 3.5
Travel control lever 2.0 1.7 ± 2.3
Travel accelerator
lever
Min. Max. 1.5 1.2 ± 1.8
Max. Min. 1.2 1.0 ± 1.4
Unload pressure
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
All levers at HOLD
.
Relieve pump outlet pressure
kg/cm
2
Max. 35 Max. 35
Boom
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
Check one circuit at a time
.
Relieve pump outlet pressure
.
For PC27R-8 only:
Relieve pressure on swing motor
kg/cm
2
210
10
210
10
Arm 210
10
210
10
Bucket 210
10
210
10
Servocontrol 30
5
30
5
Boom swing 210
10
210
10
Blade 210
10
210
10
Travel 210
10
210
10
Swing 155
5
155
5
LS differential
pressure
.
Hydraulic oil temperature:
45 ± 55ëC
.
Engine speed: max.
.
Differential pressure=
pump delivery
pressure ± LS pressure
All levers at HOLD Max. 35 Max. 35
Travel rotating freely,
travel lever at half-way
position
. FOR THE MACHINE
20-6
PC20R-8 PC27R-8
Operating
force
for
control
of
levers
and
pedals
Hydraulic
pressure