Genie Z80/60 Service Manual page 173

June 2011
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How to Adjust the Secondary
Boom Down Relief Valve
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the port on the function manifold.
LS
2 Start the engine from the ground controls.
3 Press and release the rpm select button until
the engine changes to high idle.
4 Raise the secondary boom approximately
12 inches / 30 cm.
5 Place a 4 x 4 inch / 10 x 10 cm block on the
secondary boom rest pad. Lower the secondary
boom onto the block.
Crushing hazard. Keep hands
clear of the block when lowering
the secondary boom.
6 Simultaneously push and hold the function
enable/high speed button and the secondary
boom down button. Observe the reading on the
pressure gauge. Refer to Section 2,
Specifications.
7 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap (item D).
Part No. 88619
8 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.
9 Start the engine and repeat step to confirm
relief valve pressure.
10 Start the engine and raise the secondary boom
approximately 12 inches / 30 cm. Remove the
block and lower the secondary boom to the
stowed position.
11 Turn the engine off and remove the pressure
gauge.
How to Adjust the Secondary
Boom Extend Relief Valve
Note: Perform this procedure with the secondary
boom fully raised.
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the LS port on the function manifold.
2 Start the engine from the ground controls.
3 Simultaneously push and hold the function
enable/high speed button and the secondary
boom up/extend button with the secondary
boom fully raised and extended. Observe the
pressure reading on the pressure gauge. Refer
to Section 2, Specifications.
Z-80/60
Section 4 • Repair Procedures
MANIFOLDS
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