How To Adjust The Primary Boom Extend Relief Valve - Genie Z-80/60 Service And Repair Manual

Service and Repair Manual
Manifolds
How to Adj ust the Pri mar y Boom Extend R elief Val ve
How to Adjust the Primary Boom
Extend Relief Valve
Note: Refer to Function Manifold Component list to
locate the primary boom extend relief valve.
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 Raise the boom to a horizontal position. Turn
the engine off.
4 Locate the boom extended limit switch
(LSP1EO) on the outside of the primary boom.
5 Remove the limit switch mounting bracket
retaining fasteners.
6 Pull the limit switch and bracket assembly out
of the boom tube and let it hang down.
7 Start the engine from the ground controls and
press and release the rpm select button until
the engine changes to high idle.
8 Simultaneously push and hold the function
enable/high speed button and the primary
boom extend button with the primary boom
fully extended. Observe the reading on the
pressure gauge. Refer to Specifications,
Hydraulic Specifications.
88
9 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap.
10 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.
11 Repeat steps 7 through 8 to confirm relief
valve pressure.
12 Start the engine and fully retract the primary
boom. Turn the engine off.
13 Install the limit switch and bracket assembly to
the primary boom.
14 Remove the pressure gauge.
September 2016
Part No. 1268556