LA271 • LA301 •
LA351
• LA401 •
LA272· LA302· LA352·
LA402 WSM, 17021
CHECKING, DISASSEMBLING AND SERVICING
[1]
CONTROL
VALVE
CHECKING AND ADJUSTING
SERVICING
LA271 . LA301 . LA351
17020F00320
17020F00330
Relief Valve Setting Pressure
1.
Remove the hose with quick coupler from the A2 port (1)
of
the
control valve, and set a pressure gauge.
2.
Start the engine, warm it up at an idle, and then set the engine
speed at maximum.
3.
Move the hydraulic control lever to "DUMP" position, and read
the pressure gauge indication when a sound indicating the relief
valve operation is heard.
4.
If
the pressure is not within the factory specifications, remove the
acorn nut (4) and loosen the jam nut (3) then adjust by adjust
screw (5).
LA271 / LA272
13.1
to 13.8 MPa
LA351 / LA352 133.5 to 140.5 kgf/cm
2
Relief valve
Factory
LA401 / LA402 1900 to 2000
psi
setting
pressure
spec.
14.5 to 15.2 MPa
LA301
/ LA302 147.5 to 154.6 kgf/cm
2
2100 to 2200
psi
Condition
• Engine speed Maximum
•
Oil
temperature
..
.45 to
55°C
113t0131
of
NEW VALVE and LA401
LA272 . LA302 . LA352 . LA402
1
17000F00562
NEW VALVE and LA401
LA272 . LA302 . LA352 . LA402
12210F00560
(1)
A2 Port
(2)
Relief Valve
(3)
Jam Nut
S-9
(4) Acorn Nut
(5) Adjust Screw
17021800040
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