Service Manual
February 2022
Function Manifold
46
GRC
™
Part No. 1314708GT
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.
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.
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.
5 Remove the platform controls from the
platform.
6 Hold the lift relief valve with a wrench and
remove the cap (schematic item
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.
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: ......