Doosan DA40 - 7.2.2 Repairing the Hydraulic gas cylinder

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FRONT WAGON
Ch 7 Page 6 Ch 7 Page 7
FRONT WAGON
7.2.2 Repairing the Hydraulic gas cylinder
Opening
Remove the oil plugs and extend the cylinder to full
stroke (935 mm) to get the oil and the air from below
the piston.
Turn the cylinder over.
Eject transport oil closing the cylinder.
To replace the internal sealings on the hydaulic cylinder, follow the procedures:
1: Oil check valve (fill oil)
2: Bleed valve
3: Gas valve
4: Test point
Checking cylinder pressure
tool kit: 531794
Adapter (Use adapter 531854 to check and
fill nitrogen.)
Attach tool on cylinder test point to perform
pressure test.
1
3
2
4
M28 x 1.5
5/8- 18 UNF
(8V1-Vg 8)
A
B
5
6
10
8
1
7
9
3
4
Figure 11
Aply locktite and thread tape when
re-assembling valves.
Figure 13
Figure 12
BLEED VALVE
EB006
SEALED WITH
THREAD TAPE
100
TORQUE
= 6NM
These 3 valves are
sealed with locktite 542