Valve Adjustments - Function Manifold; How To Adjust The System Relief Valve; How To Adjust The Secondary Boom Down Relief Valve - Terex Genie Z-51/30J Service And Repair Manual

Service and Repair Manual
Manifolds
8-2 Valve Adjustments - Function
Manifold
How to Adj ust the Sy stem Reli ef Valve
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.
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.
52
How to Adj ust the Sec ondary Boom D own R elief Valv e
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.
7 Repeat steps 2 through 5 and recheck relief
valve pressure.
8 Remove the pressure gauge.
Z®-51/31J
November 2017
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
Part No. 1268553GT