Komatsu PC20R-8 Shop Manual page 122

. FOR THE MACHINE
Classifi-
Check item
cation
Boom lever
Arm lever
Bucket lever
Swing lever
Boom swing pedal
Blade lever
Travel control lever
Travel accelerator
lever
Unload pressure
Boom
Arm
Bucket
Servocontrol
Boom swing
Blade
Travel
Swing
LS differential
pressure
20-6
Machine model
Test condition
.
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
.
Engine speed: high idling
.
Hydraulic oil temperature: 45 ± 55ëC
.
All levers at HOLD
.
Relieve pump outlet pressure
.
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
.
Hydraulic oil temperature:
45 ± 55ëC
.
Engine speed: max.
.
Differential pressure=
pump delivery
pressure ± LS pressure
Min. Max.
Max. Min.
All levers at HOLD
Travel rotating freely,
travel lever at half-way
position
PC20R-8
Standard Permissible
Unit
value
2.0
2.0
2.0
2.0
kg
8.0
3.0
2.0
1.5
1.2
2
kg/cm Max. 35
210
10
210
10
210
10
30
5
210
10
2
210
kg/cm
10
210
10
155
5
Max. 35
PC20R-8 PC27R-8
value
1.7 ± 2.3
1.7 ± 2.3
1.7 ± 2.3
1.7 ± 2.3
7.0 ± 9.0
2.5 ± 3.5
1.7 ± 2.3
1.2 ± 1.8
1.0 ± 1.4
Max. 35
210
10
210
10
210
10
30
5
210
10
210
10
210
10
155
5
Max. 35