February 2022
Service Manual
Function Manifold
Part No. 1314708GT
GRC
™
45
4-2
Valve Adjustments - Function
Manifold
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.
How to Adjust the System Relief
Valve
1 Locate the system relief valve on the function
manifold.
1 test port
2 system relief valve
2 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the test port on the function
manifold.
3 Chock both sides of the wheels at the steer
end of the machine.
4 Remove the platform controls from the
platform.
5 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.
6 Move and hold the joystick fully in either
direction while observing the pressure reading
on the pressure gauge. Note the pressure.
Refer to Specifications,
Hydraulic Component
Specifications.
7 Turn the machine off. Hold the system relief
valve with a wrench and remove the cap.
8 Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
9 Install the relief valve cap.
10 Repeat steps 5 and 6 to confirm the relief
valve pressure.
Summary of Contents for Genie GRC-12
Page 113: ...February 2022 Service Manual 101 Electrical Schematic GRC Options...
Page 115: ...February 2022 Service Manual 103 Electrical Schematic GRC from GRC11 1000 to GRC11 1078...
Page 118: ...Service Manual February 2022 106 Electrical Schematic GRC from GRC11 1000 to GRC11 1078...
Page 119: ...February 2022 Service Manual 107 Electrical Schematic GRC from GRC11 1079 to GRC14 1780...
Page 122: ...Service Manual February 2022 110 Electrical Schematic GRC from GRC11 1079 to GRC14 1780...
Page 123: ...February 2022 Service Manual 111 Electrical Schematic GRC from GRC14 1781 to GRC15 2343...
Page 126: ...Service Manual February 2022 114 Electrical Schematic GRC from GRC15 2344 to GRC16P 2481...
Page 127: ...February 2022 Service Manual 115 Electrical Schematic GRC from GRC16P 2482 to GRC16P 2562...
Page 130: ...Service Manual February 2022 118 Electrical Schematic GRC from GRC16P 2563 to GRCP 5999...
Page 131: ...February 2022 Service Manual 119 Hydraulic Schematic GRC from GRC11 1000 to GRC12 1168...
Page 135: ......