January 2012Section 4 • Repair Procedures
4 - 28 GS-30 • GS-32 • GS-46 • GS-47 Part No. 228901
MANIFOLDS
5-8
Valve Adjustments -
Function Manifold
How to Adjust the
System Relief Valve
Perform this test from the ground with the platform
controls. Do not stand in the platform.
Be sure that the hydraulic oil level is at the
FULL
mark on the hydraulic tank.
1 Locate the system relief valve on the function
manifold (schematic item I).
2 Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to the test port on the function
manifold (schematic item A, AA or DA).
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 control and pull
out the red Emergency Stop button to the on
position at both the ground and platform
controls.
GS-1530/32 and GS-1930/32
a test port
b system relief valve
6 Move and hold the joystick fully in either
direction while observing the pressure reading
on the pressure gauge. Note the pressure.
Refer to Section 2,
Specifications
.
7 Turn the machine off. Hold the system relief
valve with a wrench and remove the cap
(schematic item I, AB or DB).
8 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.
9 Install the relief valve cap.
10 Repeat steps 5 and 6 to confirm the relief valve
pressure.
GS-32, GS-46 and GS-47
a test port
b system relief valve
c steer relief valve
d lift relief valve
c
a b
d
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