Genie GR-12 Service Manual page 79

May 2018
How to Adjust the
Platform Lift Relief Valve
Note: Verify the system relief is adjusted correctly
before performing this procedure.
Note: Perform this test from the ground with the
platform controls. Do not stand in the platform.
Note: Verify the hydraulic oil level is at the FULL
mark on the hydraulic tank.
1 Locate the lift relief valve on the function
manifold (schematic item C).
1 test port
2 system relief valve
3 lift relief valve
2 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the test port on the function
manifold (schematic item A).
3 Place maximum rated load into the platform.
Secure the load to the platform. Refer to
Specifications, Machine Specifications.
4 Turn the key switch to platform controls and
pull out the red Emergency Stop button to the
on position at both ground and platform
controls.
Part No. 1275811GT
5 Remove the platform controls from the
platform.
6 Hold the lift relief valve with a wrench and
remove the cap (schematic item C).
7 While activating the platform up function,
adjust the internal hex socket clockwise, just
until the platform fully rises.
8 Fully lower the platform to the stowed position.
9 Add an additional 50 pounds / 22.7 kg to the
platform. Secure the additional weight.
10 Attempt to raise the platform.
Result: The power unit should not be able to
lift platform.
Result: If the power unit lifts the platform,
adjust the internal hex nut socket
counterclockwise until the platform will not
rise.
11 Install the relief valve cap.
12 Remove the weight from the platform.
GR ™ • QS ™ R • QS ™ W
Service Manual
Function Manifold
65