November 2016
Service and Repair Manual
Manifolds
Part No. 1272220GT
GS-2669 DC • GS-3369 DC • GS-4069 DC
49
6-2 Valve Adjus tments - F unc tion M anif ol d
6-2
Valve Adjustments -
Function Manifold
How t o Adj ust t he Sy stem Reli ef Valve
How to Adjust the System Relief Valve
Note: Perform this procedure with the machine in
the stowed position.
Note: Refer to Function Manifold Component list to
locate the system relief valve.
1
Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to test port #1 (TP1) on the
function manifold.
2
Remove the platform controls from the
platform and place the controls near the
function manifold on the hydraulic tank side of
the machine.
3
Remove the coil from the platform up valve.
Do not disconnect the harness from the coil.
4
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.
5
Press and hold the enable and platform up
buttons OR select the platform function button
and activate platform up. Note the pressure
reading on the pressure gauge. Refer to
Specifications,
Hydraulic Components
Specifications
.
6
Use a wrench to hold the system relief valve
and remove the cap.
7
Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Install the relief valve cap.
Tip-over hazard. Do not adjust
the relief valve higher than
specified.
8
Repeat this procedure beginning with step 4 to
confirm the relief valve pressure.
9
Remove the pressure gauge.
1 test port #1
2 system relief valve
3 platform up valve
