Genie Z-30/20N Service Manual page 87

June 2011
REV B
How to Adjust the Secondary
Boom Down Relief Valve
1 Connect a 0 to 3000 psi / 0 to 200 bar pressure
gauge to the test port on the function manifold.
2 Turn the key switch to ground control and pull
out the red Emergency Stop button to the on
position.
3 Move and hold the function enable toggle switch
to either side and move and hold the secondary
boom up/down toggle switch in the down
direction with the secondary boom fully
lowered. Observe the pressure reading on the
pressure gauge. Refer to Section 2,
Specifications .
4 Turn the machine off. Hold the secondary boom
down relief valve with a wrench and remove the
cap (item E).
5 Adjust the internal hex socket. Turn it clockwise
to increase the pressure or counterclockwise to
decrease the pressure. Install the relief valve
cap.
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
6 Repeat steps 2 and 3 to confirm the relief valve
pressure setting.
Part No. 139378 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
Section 4 • Repair Procedures
How to Adjust the Primary Boom
Extend Relief Valve
1 Connect a 0 to 3000 psi / 0 to 200 bar pressure
gauge to the test port on the function manifold.
2 Turn the key switch to ground control and pull
out the red Emergency Stop button to the on
position.
3 Move and hold the function enable toggle switch
to either side and move and hold the primary
boom extend/retract toggle switch in the extend
direction with the primary boom fully extended.
Observe the pressure reading on the pressure
gauge. Refer to Section 2, Specifications .
4 Turn the machine off. Hold the primary boom
extend relief valve with a wrench and remove
the cap (item G).
5 Adjust the internal hex socket. Turn it clockwise
to increase the pressure or counterclockwise to
decrease the pressure. Install the relief valve
cap.
Tip-over hazard. Do not adjust
the relief valves higher than
specified.
6 Repeat steps 2 and 3 to confirm the relief valve
pressure setting.
MANIFOLDS
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