Valve Adjustments - Function Manifold - Genie GR-8 Service Manual

Section 4 • Repair Procedures
MANIFOLDS
6-4
Valve Adjustments -
Function Manifold
How to
Adjust the System Relief Valve
Be sure that the hydraulic oil level
is at the
tank.
1 Raise the platform approximately 4 feet / 1.2 m.
2 Place a lifting strap from an overhead crane
under the platform. Support the platform. Do not
apply any lifting pressure.
Component damage hazard. The
platform railings can be damaged
if they are used to lift the platform.
Do not attach the lifting strap to
the platform railings.
3 Remove the drive chassis cover.
4 Locate the system relief valve on the function
manifold (item H or AG).
5 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the test port on the function manifold
(item A or AA).
6 Chock both sides of the wheels at the steer end
of the machine.
4 - 30
mark on the hydraulic
FULL
GR-8 • GR-12 • GR-15
7 Remove the platform controls from the platform.
Perform this test from the ground
with the platform controls. Do not
stand in the platform.
8 Turn the key switch to platform control and pull
out the red Emergency Stop button to the on
position at both the ground and platform
controls.
9 Press and hold the function enable switch.
Move the joystick in the full forward direction.
while observing the pressure reading on the
pressure gauge. Note the pressure. Refer to
Section 2, Specifications .
10 Turn the machine off. Hold the system relief
valve with a wrench and remove the cap.
11 Adjust the internal hex socket. Turn it clockwise
to increase the pressure or counterclockwise to
decrease the pressure.
Tip-over hazard. Failure to adjust
the relief valves to specification
could result in the machine tipping
over, causing death or serious
injury. Do not adjust the relief
valve pressures higher than
specifications.
12 Install the relief valve cap.
13 Repeat steps 8 through 9 to confirm the relief
valve pressure.
14 Install the relief valve cap. Remove the
pressure gauge.
August 2005
REV B
Part No. 72965