MAHA MPJ Series Original Operating Instructions page 67

2 Check the condition of the hydraulic oil via the oil sight glass and replace if
necessary (see section "Replacing the hydraulic oil").
3 Place a cloth around the piston rods below the G1/8" screw plug. The screw
plug including the USIT sealing ring can then be removed (A). Immediately
afterwards, screw in the bleeder valve (B) and tighten it hand-tight. Make
sure that the bleeder valve is closed, among other things. A small amount of
hydraulic oil may escape during this process.
4 Remove the oil filler plug (C).
5 Then screw in the threaded sleeve (M14x1.5a x G 1/4i) and a straight plug
connection (R ¼ x Ø8 mm). Tighten hand-tight with socket wrench
attachment A/F 14 (D).
6 The bleeder valve must now be connected using a pneumatic hose with an
outer diameter of 8 mm (calibrated). The recommended hose length is 1.25
m. A transparent hose must be used to assess the hydraulic oil.
7 Check again that the bleeder valve is closed.
8 Connect the pit jack to the compressed air network. Actuate the fast stroke
and extend to the end stop. Wait approx. 10 seconds until the pneumatic
overpressure has been released (acoustic test).
9 The bleeder valve can now be unlocked and the hydraulic system can be
bled and flushed using the load stroke. Load stroke must be actuated
continuously.
CAUTION
Under no circumstances should the fast approach stroke be actuated, as this
would cause air to enter the hydraulic lifting system.
1 Bleed the air until no air bubbles can be seen in the hydraulic oil
(transparent hose). The hydraulic oil should run back into the tank clear and
without air bubbles. The recommended Bleeding time is at least 1 minute.
11 If the hydraulic oil is now free of air bubbles, the bleeder valve is closed first
and then the load stroke is stopped immediately.
12 Fully retract the pit jack and then extend it again. Repeat the bleeding
process.
13 Fully retract the pit jack.
14 Remove the hose from the bleeder valve and allow any residual oil in the
hose to run back. Remove the straight screw-in fitting and screw in the
screw plug.
15 Place a cloth underneath the screwed-in bleeder valve.
16 Remove the bleeder valve and screw in the screw plug immediately
afterwards. Minimum installation torque of the screw plug 7.1 Nm.
BA550001-en
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