Genie ZX-135/70 Service Manual page 170

August 2014
How to Prime the Function Pump
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications, Hydraulic Hose and Fitting Torque
Specifications.
1 Remove the case drain hydraulic hose from
the top of the function pump.
Note: The case drain hose is the smaller of the two
hoses on top of the function pump and closest to
the drive pump.
2 Locate and open the hydraulic tank shut-off
valve at the hydraulic tank that supplies
hydraulic oil to the function pump. Do not
open the valve for the drive pump.
3 When hydraulic fluid begins to come out of the
case drain port of the function pump, install
the function pump case drain hose.
4 Clean up any oil that may have spilled.
Properly discard the used oil.
5 Start the engine from the ground controls.
6 Check for hydraulic leaks.
Part No. 218700
How to Adjust the Function Pump
Standby Pressure
1 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the test port on the function
manifold
2 Start the engine from the ground controls and
allow the engine to run at low idle.
3 Observe the pressure reading on the pressure
gauge.
Result: The gauge should show 250 psi /
17 bar.
Result: If the gauge does not show 250 psi /
17 bar, proceed with step 4 to adjust the
function pump standby pressure.
4 Loosen the set screw for the standby pressure
adjustment screw.
1 standby pressure set screw
2 standby pressure adjustment screw
ZX-135/70
Service Manual
Hydraulic Pumps
155