Bleeding Air From The Hydraulic Circuits - Komatsu PC20R-8 Shop Manual

TESTING AND ADJUSTMENTS

BLEEDING AIR FROM THE HYDRAULIC CIRCUITS

Sequence of operations or procedures for bleeding the air
Substitution of hydraulic oil
.
Cleaning tank filter
.
Substitution filter
.
Repair - substitution
.
pump
Removal of suction tube
.
Substitution - repair
.
control valve
Repair-Substitution
.
cylinders
Removal of cylinders tube
.
Repair - substitution
.
swing motor
Removal of tubes
.
from swing motor
Repair - substitution
.
travel motor - joint
Removal of tubes
.
from travel motor - joint
,
1: Only bleed air from the swing and travel motors if the engine oil (casing) is to be drained.
1. Bleeding air from the pump
1 - Loosen and remove the cap (1) from the pump
body (2).
2 - Pour hydraulic oil through the hole until the entire
casing is full.
3 - Replace the cap (1).
Cap: PC20R-8: 16.7w2.5 Nm
PC27R-8: 63.7w4.9 Nm
H After filling the casing, start the engine and al-
low it to run at low idling for about 10 minutes
before proceding to bleed the air from the cir-
cuits.
20-52
1 2
Bleeding air Starting
from pumps engine
p
p
p
p
p
p
p
p
p
BLEEDING AIR FROM THE HYDRAULIC CIRCUITS
Procedures for bleeding air
3 4
Bleeding Bleeding air Bleeding air
air from from swing
cylinders motor
p p
,
1
p
p
p
p
PC20R-8
1
2
PC27R-8
5 6
Pressuris-
from travel
ing tank
motor
p p
,
1
p
p
p
p
p
p p
1
2
PC20R-8 PC27R-8
7
Starting
tasks
p
p
p
p
p
p
p
RKPA2450
RKPA2460