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

September 2016
How to Adj ust the Pri mar y Boom Down R elief Val ve
How to Adjust the Primary Boom
Down Relief Valve
Note: Perform this procedure with the boom in the
stowed position.
Note: Refer to Function Manifold Component list to
locate the primary boom down 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 Press and release the rpm select button until
the engine changes to high idle.
4 Raise the primary boom approximately 5 feet /
1.5 m.
5 Place a 4 x 4 inch / 10 x 10 cm block on the
primary boom rest pad. Lower the primary
boom onto the block.
Crushing hazard. Keep hands
clear of the block when lowering
the primary boom.
6 Simultaneously push and hold the function
enable/high speed button and the primary
boom down button. Observe the pressure
reading on the pressure gauge. Refer to
Specifications, Hydraulic Specifications.
7 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap.
Part No. 1268556
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 steps 6 through
8 to confirm the relief valve pressure.
10 Start the engine and raise the primary boom
approximately 12 inches / 30 cm. Remove the
block and lower the primary boom to the
stowed position.
11 Turn the engine off and remove the pressure
gauge.
Service and Repair Manual
Manifolds
87