Testing And Adjusting Oil Pressure In Work Equipment, Swing, And Travel Circuits - Komatsu PC200-8M0 Shop Manual

SEN06127-00
Testing and adjusting oil pressure
in work equipment, swing, and
travel circuits
a Measuring and adjusting tools for oil pressure
in work equipment, swing, and travel circuits
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
J
799-101-5220 Nipple (10 × 1.25 mm)
2
07002-11023
k
Stop the machine on a level ground and
lower the work equipment to the ground.
Then, release the residual pressure from the
hydraulic circuit. For details, see "Releasing
residual pressure from hydraulic circuit".
Measuring
a The oil pressure in the work equipment, swing,
and travel circuits (pump discharge pressure)
can be checked with monitoring function of the
machine monitor, too (For details, see "Special
functions of machine monitor").
q Monitoring code: 01100 F pump pressure
q Monitoring code: 01101 R pump pressure
a Measure the oil pressure in the work equip-
ment, swing, and travel circuits under the fol-
lowing condition.
Hydraulic oil temperature: Within operat-
q
ing range
1. Preparation work
1) Open the side cover of the pump room
and remove oil pressure pickup plugs (1)
and (2).
(1): Front pump discharge pressure
q
pickup plug
q (2): Rear pump discharge pressure
pickup plug
34
30-101
Part name
O-ring
101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in work equipment,
2) Install nipples J2 and connect oil pressure
gauges [1] of hydraulic tester J1.
a Use the oil pressure gauge with
capacity 60 MPa {600 kg/cm
2. Combination of pump, actuator, and valve
a When the oil from the pumps is divided,
the front pump and rear pump act inde-
pendently on each actuator. Note that dif-
ferent actuators relieve different valves.
a When the work equipment circuit or swing
circuit is relieved singly, the oils of the
pumps are merged. When the travel circuit
is relieved singly, the oils of the pumps are
divided.
a The actuators in the table are arranged in
the order when the control valve is seen
from the front of the machine (and an
attachment is installed to the service
valve).
Actuator
(R unload valve) (R main relief valve)
Service Safety-suction valve
Bucket R main relief valve
Left travel R main relief valve
Raise: R main relief valve
Boom
Lower: Safety-suction valve
(Pump merge-divider valve) (Travel junction valve)
(Self pressure reducing valve)
Swing Swing motor safety valve
Right
F main relief valve
travel
Arm F main relief valve
(F unload valve) (F main relief valve)
(Centralized safety valve) (Back pressure valve)
PC200, 200LC, 220, 220LC-8M0
2
}.
Valve relieved