Genie GR-8 Service Manual page 77

August 2005
REV B
How to
Adjust the Lift Relief Valve
Be sure that the hydraulic oil level
is at the
tank.
1 Raise the platform approximately 4 feet / 1.2 m.
2 Remove the drive chassis cover.
3 Place two 4 x 4 x 48 inch / 10 x 10 x 120 cm
blocks across the drive chassis to support the
platform.
4 Locate the lift relief valve on the function
manifold (item F or AH).
5 Hold the system relief valve with a wrench and
remove the cap.
6 Lower the platform onto the blocks.
7 Place the maximum rated load in the platform.
Secure the load to the platform. Refer to
Section 2, Specifications .
8 While activating the platform up function, adjust
the internal hex socket until the platform begins
to raise.
9 Fully lower the platform.
10 Add an additional 50 pounds / 22.7 kg to the
platform. Secure the additional weight.
Part No. 72965
mark on the hydraulic
FULL
GR-8 • GR-12 • GR-15
Section 4 • Repair Procedures
11 Activate the platform up function.
Result: The platform does not raise.
Result: The platform raises. Adjust the internal
hex socket of the lift relief valve just until the
platform will not raise.
12 Install the relief valve cap.
13 Remove the weight from the platform.
14 Bleed the hydraulic system by raising the
platform to full height. If the pump cavitates or if
the platform fails to reach full height, add
hydraulic oil until the pump is functioning
correctly. Do not overfill the hydraulic tank.
Component damage hazard. Do
not continue to operate the
machine if the hydraulic pump is
cavitating.
MANIFOLDS
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