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Section 7 • Repair Procedures
MANIFOLDS
7-2
Valve Adjustments -
Function Manifold
How to Adjust the System
Relief Valve
Perform this procedure with the
boom in the stowed position.
1 Connect a 0 to 5000 psi (0 to 345 bar) pressure
gauge to the test port on the function manifold.
2 Turn the key switch to ground control and pull
out the Emergency Stop button to the
position.
3 Activate the function enable switch and hold the
boom up switch with the boom fully raised.
Observe the pressure reading on the pressure
gauge.
System relief valve specifications
Pressure
4 Turn the machine off. Hold the relief valve and
remove the cap (item O, function manifold).
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 through 5 to confirm the relief
valve pressure.
7 - 28
ON
3500 psi
241 bar
Genie Z-20/8N & Genie Z-20/8 & Genie Z-25/8
How to Adjust the Boom Down
Relief Valve
Perform this procedure with the
boom in the stowed position.
1 Connect a 0 to 3000 psi (0 to 206 bar) pressure
gauge to the test port on the function manifold.
2 Turn the key switch to ground control and pull
out the Emergency Stop button to the
position.
3 Activate the function enable switch and hold the
boom down switch with the boom fully lowered.
Observe the pressure reading on the pressure
gauge.
Boom down relief valve specifications
Pressure
4 Turn the machine off. Hold the relief valve and
remove the cap (item T, function manifold).
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 through 5 to confirm the relief
valve pressure.
First Edition • Third Printing
ON
1500 psi
103 bar
Part No. 41314
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