Genie ZX-135/70 Service Manual page 180

August 2014
How to Adjust the Primary Boom
Extend Relief Valve
Note: Perform this procedure with the axles
extended.
1 Remove the primary boom end cover from the
pivot end of the boom.
2 Locate the primary boom extend limit switch
on the side of the primary boom.
3 Follow the wiring from the switch to the pivot
end of the primary boom. Locate and
disconnect the wire connector for the primary
boom extend limit switch.
Note: The correct wire connector will be a 2 pin
connector with a yellow marker on the cable.
4 Start the engine and fully extend the primary
boom. Turn the engine off.
5 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the ptest port on the
function manifold.
6 Start the engine from the ground controls and
press and release the rpm select button until
the engine changes to high idle.
Part No. 218700
7 Simultaneously push and hold the function
enable/high speed button and the primary
boom extend button with the primary boom
fully extended. Observe the pressure reading
on the pressure gauge. Refer to
specifications, Hydraulic Component
Specifications.
8 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap.
9 Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Install the relief valve cap.
10 Repeat step 7 to confirm relief valve pressure.
11 At the pivot end of the primary boom, connect
the primary boom extend limit switch
connector, that was disconnected in step 3.
12 Install the primary boom end cover.
13 Remove the pressure gauge.
14 Start the engine and fully retract the primary
boom. Turn the engine off.
ZX-135/70
Service Manual
Manifolds
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
165