Genie Z-51/30J, Service And Repair Manual

Page: 65 / 144

October 2020
Part No. 1268553GT Z®-51/ 31J 55
Service and Repair Manual
Manifolds
8-2
Valve Adjustments - Function
Manifold
How to Adjust the System
Relief Valve
Note: Perform this procedure with the boom in the
stowed position.
Note: Refer to Function Manifold Component list to
locate the system relief valve.
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the test1 port on the function
manifold.
2 Start the engine from the ground controls.
3 Hold the function enable switch to the high
rpm position and activate and hold the primary
boom retract switch with the boom fully
retracted.
4 Observe the pressure reading on the pressure
gauge. Refer to Specifications, Hydraulic
Specifications.
5 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap.
6 Adjust the internal hex socket. Turn it clockwise
to increase the pressure or counterclockwise to
decrease the pressure. Install the relief valve
cap.
WARNING
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
7 Repeat steps 2 through 5 and recheck relief
valve pressure.
8 Remove the pressure gauge.
How to Adjust the Secondary
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 secondary boom down relief valve.
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the test1 port on the function
manifold.
2 Start the engine from the ground controls.
3 Hold the function enable switch to the high rpm
position and activate and hold the secondary
boom down switch with the secondary boom
fully lowered.
4 Observe the pressure reading on the pressure
gauge. Refer to Specifications, Hydraulic
Specifications.
5 Turn the engine off. Use a wrench to hold the
relief valve and remove the cap.
6 Adjust the internal hex socket. Turn it clockwise
to increase the pressure or counterclockwise to
decrease the pressure. Install the relief valve
cap.
WARNING
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
7 Repeat steps 2 through 5 and recheck relief
valve pressure.
8 Remove the pressure gauge.